Module pyparsing |
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# Source Code for Module pyparsing

       1  # module pyparsing.py
       2  #
       3  # Copyright (c) 2003-2015  Paul T. McGuire
       4  #
       5  # Permission is hereby granted, free of charge, to any person obtaining
       6  # a copy of this software and associated documentation files (the
       7  # "Software"), to deal in the Software without restriction, including
       8  # without limitation the rights to use, copy, modify, merge, publish,
       9  # distribute, sublicense, and/or sell copies of the Software, and to
      10  # permit persons to whom the Software is furnished to do so, subject to
      11  # the following conditions:
      12  #
      13  # The above copyright notice and this permission notice shall be
      14  # included in all copies or substantial portions of the Software.
      15  #
      16  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
      17  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
      18  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
      19  # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
      20  # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
      21  # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
      22  # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
      23  #
      24
      25  __doc__ = \
      26  """
      27  pyparsing module - Classes and methods to define and execute parsing grammars
      28
      29  The pyparsing module is an alternative approach to creating and executing simple grammars,
      30  vs. the traditional lex/yacc approach, or the use of regular expressions.  With pyparsing, you
      31  don't need to learn a new syntax for defining grammars or matching expressions - the parsing module
      32  provides a library of classes that you use to construct the grammar directly in Python.
      33
      34  Here is a program to parse "Hello, World!" (or any greeting of the form C{"<salutation>, <addressee>!"})::
      35
      36      from pyparsing import Word, alphas
      37
      38      # define grammar of a greeting
      39      greet = Word( alphas ) + "," + Word( alphas ) + "!"
      40
      41      hello = "Hello, World!"
      42      print (hello, "->", greet.parseString( hello ))
      43
      44  The program outputs the following::
      45
      46      Hello, World! -> ['Hello', ',', 'World', '!']
      47
      48  The Python representation of the grammar is quite readable, owing to the self-explanatory
      49  class names, and the use of '+', '|' and '^' operators.
      50
      51  The parsed results returned from L{I{ParserElement.parseString}<ParserElement.parseString>} can be accessed as a nested list, a dictionary, or an
      52  object with named attributes.
      53
      54  The pyparsing module handles some of the problems that are typically vexing when writing text parsers:
      55   - extra or missing whitespace (the above program will also handle "Hello,World!", "Hello  ,  World  !", etc.)
      56   - quoted strings
      57   - embedded comments
      58  """
      59
      60  __version__ = "2.1.8"
      61  __versionTime__ = "14 Aug 2016 08:43 UTC"
      62  __author__ = "Paul McGuire <ptmcg@users.sourceforge.net>"
      63
      64  import string
      65  from weakref import ref as wkref
      66  import copy
      67  import sys
      68  import warnings
      69  import re
      70  import sre_constants
      71  import collections
      72  import pprint
      73  import traceback
      74  import types
      75  from datetime import datetime
      76
      77  try:
      78      from _thread import RLock
      79  except ImportError:
      80      from threading import RLock
      81
      82  try:
      83      from collections import OrderedDict as _OrderedDict
      84  except ImportError:
      85      try:
      86          from ordereddict import OrderedDict as _OrderedDict
      87      except ImportError:
      88          _OrderedDict = None
      89
      90  #~ sys.stderr.write( "testing pyparsing module, version %s, %s\n" % (__version__,__versionTime__ ) )
      91
      92  __all__ = [
      93  'And', 'CaselessKeyword', 'CaselessLiteral', 'CharsNotIn', 'Combine', 'Dict', 'Each', 'Empty',
      94  'FollowedBy', 'Forward', 'GoToColumn', 'Group', 'Keyword', 'LineEnd', 'LineStart', 'Literal',
      95  'MatchFirst', 'NoMatch', 'NotAny', 'OneOrMore', 'OnlyOnce', 'Optional', 'Or',
      96  'ParseBaseException', 'ParseElementEnhance', 'ParseException', 'ParseExpression', 'ParseFatalException',
      97  'ParseResults', 'ParseSyntaxException', 'ParserElement', 'QuotedString', 'RecursiveGrammarException',
      98  'Regex', 'SkipTo', 'StringEnd', 'StringStart', 'Suppress', 'Token', 'TokenConverter',
      99  'White', 'Word', 'WordEnd', 'WordStart', 'ZeroOrMore',
     100  'alphanums', 'alphas', 'alphas8bit', 'anyCloseTag', 'anyOpenTag', 'cStyleComment', 'col',
     101  'commaSeparatedList', 'commonHTMLEntity', 'countedArray', 'cppStyleComment', 'dblQuotedString',
     102  'dblSlashComment', 'delimitedList', 'dictOf', 'downcaseTokens', 'empty', 'hexnums',
     103  'htmlComment', 'javaStyleComment', 'line', 'lineEnd', 'lineStart', 'lineno',
     104  'makeHTMLTags', 'makeXMLTags', 'matchOnlyAtCol', 'matchPreviousExpr', 'matchPreviousLiteral',
     105  'nestedExpr', 'nullDebugAction', 'nums', 'oneOf', 'opAssoc', 'operatorPrecedence', 'printables',
     106  'punc8bit', 'pythonStyleComment', 'quotedString', 'removeQuotes', 'replaceHTMLEntity',
     107  'replaceWith', 'restOfLine', 'sglQuotedString', 'srange', 'stringEnd',
     108  'stringStart', 'traceParseAction', 'unicodeString', 'upcaseTokens', 'withAttribute',
     109  'indentedBlock', 'originalTextFor', 'ungroup', 'infixNotation','locatedExpr', 'withClass',
     110  'tokenMap', 'pyparsing_common',
     111  ]
     112
     113  system_version = tuple(sys.version_info)[:3]
     114  PY_3 = system_version[0] == 3
     115  if PY_3:
     116      _MAX_INT = sys.maxsize
     117      basestring = str
     118      unichr = chr
     119      _ustr = str
     120
     121      # build list of single arg builtins, that can be used as parse actions
     122      singleArgBuiltins = [sum, len, sorted, reversed, list, tuple, set, any, all, min, max]
     123
     124  else:
     125      _MAX_INT = sys.maxint
     126      range = xrange
     127
     128 -    def _ustr(obj):
     129          """Drop-in replacement for str(obj) that tries to be Unicode friendly. It first tries
     130             str(obj). If that fails with a UnicodeEncodeError, then it tries unicode(obj). It
     131             then < returns the unicode object | encodes it with the default encoding | ... >.
     132          """
     133          if isinstance(obj,unicode):
     134              return obj
     135
     136          try:
     137              # If this works, then _ustr(obj) has the same behaviour as str(obj), so
     138              # it won't break any existing code.
     139              return str(obj)
     140
     141          except UnicodeEncodeError:
     142              # Else encode it
     143              ret = unicode(obj).encode(sys.getdefaultencoding(), 'xmlcharrefreplace')
     144              xmlcharref = Regex('&#\d+;')
     145              xmlcharref.setParseAction(lambda t: '\\u' + hex(int(t[0][2:-1]))[2:])
     146              return xmlcharref.transformString(ret)
     147
     148      # build list of single arg builtins, tolerant of Python version, that can be used as parse actions
     149      singleArgBuiltins = []
     150      import __builtin__
     151      for fname in "sum len sorted reversed list tuple set any all min max".split():
     152          try:
     153              singleArgBuiltins.append(getattr(__builtin__,fname))
     154          except AttributeError:
     155              continue
     156
     157  _generatorType = type((y for y in range(1)))
     158
     159 -def _xml_escape(data):
     160      """Escape &, <, >, ", ', etc. in a string of data."""
     161
     162      # ampersand must be replaced first
     163      from_symbols = '&><"\''
     164      to_symbols = ('&'+s+';' for s in "amp gt lt quot apos".split())
     165      for from_,to_ in zip(from_symbols, to_symbols):
     166          data = data.replace(from_, to_)
     167      return data
     168
     169 -class _Constants(object):
     170      pass
     171
     172  alphas     = string.ascii_uppercase + string.ascii_lowercase
     173  nums       = "0123456789"
     174  hexnums    = nums + "ABCDEFabcdef"
     175  alphanums  = alphas + nums
     176  _bslash    = chr(92)
     177  printables = "".join(c for c in string.printable if c not in string.whitespace)
     178
     179 -class ParseBaseException(Exception):
     180      """base exception class for all parsing runtime exceptions"""
     181      # Performance tuning: we construct a *lot* of these, so keep this
     182      # constructor as small and fast as possible
     183 -    def __init__( self, pstr, loc=0, msg=None, elem=None ):
     184          self.loc = loc
     185          if msg is None:
     186              self.msg = pstr
     187              self.pstr = ""
     188          else:
     189              self.msg = msg
     190              self.pstr = pstr
     191          self.parserElement = elem
     192          self.args = (pstr, loc, msg)
     193
     194      @classmethod
     195 -    def _from_exception(cls, pe):
     196          """
     197          internal factory method to simplify creating one type of ParseException
     198          from another - avoids having __init__ signature conflicts among subclasses
     199          """
     200          return cls(pe.pstr, pe.loc, pe.msg, pe.parserElement)
     201
     202 -    def __getattr__( self, aname ):
     203          """supported attributes by name are:
     204              - lineno - returns the line number of the exception text
     205              - col - returns the column number of the exception text
     206              - line - returns the line containing the exception text
     207          """
     208          if( aname == "lineno" ):
     209              return lineno( self.loc, self.pstr )
     210          elif( aname in ("col", "column") ):
     211              return col( self.loc, self.pstr )
     212          elif( aname == "line" ):
     213              return line( self.loc, self.pstr )
     214          else:
     215              raise AttributeError(aname)
     216
     217 -    def __str__( self ):
     218          return "%s (at char %d), (line:%d, col:%d)" % \
     219                  ( self.msg, self.loc, self.lineno, self.column )
     220 -    def __repr__( self ):
     221          return _ustr(self)
     222 -    def markInputline( self, markerString = ">!<" ):
     223          """Extracts the exception line from the input string, and marks
     224             the location of the exception with a special symbol.
     225          """
     226          line_str = self.line
     227          line_column = self.column - 1
     228          if markerString:
     229              line_str = "".join((line_str[:line_column],
     230                                  markerString, line_str[line_column:]))
     231          return line_str.strip()
     232 -    def __dir__(self):
     233          return "lineno col line".split() + dir(type(self))
     234
     235 -class ParseException(ParseBaseException):
     236      """
     237      Exception thrown when parse expressions don't match class;
     238      supported attributes by name are:
     239       - lineno - returns the line number of the exception text
     240       - col - returns the column number of the exception text
     241       - line - returns the line containing the exception text
     242
     243      Example::
     244          try:
     245              Word(nums).setName("integer").parseString("ABC")
     246          except ParseException as pe:
     247              print(pe)
     248              print("column: {}".format(pe.col))
     249
     250      prints::
     251         Expected integer (at char 0), (line:1, col:1)
     252          column: 1
     253      """
     254      pass
     255
     256 -class ParseFatalException(ParseBaseException):
     257      """user-throwable exception thrown when inconsistent parse content
     258         is found; stops all parsing immediately"""
     259      pass
     260
     261 -class ParseSyntaxException(ParseFatalException):
     262      """just like L{ParseFatalException}, but thrown internally when an
     263         L{ErrorStop<And._ErrorStop>} ('-' operator) indicates that parsing is to stop
     264         immediately because an unbacktrackable syntax error has been found"""
     265      pass
     266
     267  #~ class ReparseException(ParseBaseException):
     268      #~ """Experimental class - parse actions can raise this exception to cause
     269         #~ pyparsing to reparse the input string:
     270          #~ - with a modified input string, and/or
     271          #~ - with a modified start location
     272         #~ Set the values of the ReparseException in the constructor, and raise the
     273         #~ exception in a parse action to cause pyparsing to use the new string/location.
     274         #~ Setting the values as None causes no change to be made.
     275         #~ """
     276      #~ def __init_( self, newstring, restartLoc ):
     277          #~ self.newParseText = newstring
     278          #~ self.reparseLoc = restartLoc
     279
     280 -class RecursiveGrammarException(Exception):
     281      """exception thrown by L{ParserElement.validate} if the grammar could be improperly recursive"""
     282 -    def __init__( self, parseElementList ):
     283          self.parseElementTrace = parseElementList
     284
     285 -    def __str__( self ):
     286          return "RecursiveGrammarException: %s" % self.parseElementTrace
     287
     288 -class _ParseResultsWithOffset(object):
     289 -    def __init__(self,p1,p2):
     290          self.tup = (p1,p2)
     291 -    def __getitem__(self,i):
     292          return self.tup[i]
     293 -    def __repr__(self):
     294          return repr(self.tup)
     295 -    def setOffset(self,i):
     296          self.tup = (self.tup[0],i)
     297
     298 -class ParseResults(object):
     299      """
     300      Structured parse results, to provide multiple means of access to the parsed data:
     301         - as a list (C{len(results)})
     302         - by list index (C{results[0], results[1]}, etc.)
     303         - by attribute (C{results.<resultsName>} - see L{ParserElement.setResultsName})
     304
     305      Example::
     306          integer = Word(nums)
     307          date_str = (integer.setResultsName("year") + '/'
     308                          + integer.setResultsName("month") + '/'
     309                          + integer.setResultsName("day"))
     310          # equivalent form:
     311          # date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
     312
     313          result = date_str.parseString("1999/12/31")
     314
     315          def test(s, fn=repr):
     316              print("%s -> %s" % (s, fn(eval(s))))
     317          test("list(result)")
     318          test("result[0]")
     319          test("result['month']")
     320          test("result.day")
     321          test("'month' in result")
     322          test("'minutes' in result")
     323          test("result.dump()", str)
     324      prints::
     325          list(result) -> ['1999', '/', '12', '/', '31']
     326          result[0] -> '1999'
     327          result['month'] -> '12'
     328          result.day -> '31'
     329          'month' in result -> True
     330          'minutes' in result -> False
     331          result.dump() -> ['1999', '/', '12', '/', '31']
     332          - day: 31
     333          - month: 12
     334          - year: 1999
     335      """
     336 -    def __new__(cls, toklist=None, name=None, asList=True, modal=True ):
     337          if isinstance(toklist, cls):
     338              return toklist
     339          retobj = object.__new__(cls)
     340          retobj.__doinit = True
     341          return retobj
     342
     343      # Performance tuning: we construct a *lot* of these, so keep this
     344      # constructor as small and fast as possible
     345 -    def __init__( self, toklist=None, name=None, asList=True, modal=True, isinstance=isinstance ):
     346          if self.__doinit:
     347              self.__doinit = False
     348              self.__name = None
     349              self.__parent = None
     350              self.__accumNames = {}
     351              self.__asList = asList
     352              self.__modal = modal
     353              if toklist is None:
     354                  toklist = []
     355              if isinstance(toklist, list):
     356                  self.__toklist = toklist[:]
     357              elif isinstance(toklist, _generatorType):
     358                  self.__toklist = list(toklist)
     359              else:
     360                  self.__toklist = [toklist]
     361              self.__tokdict = dict()
     362
     363          if name is not None and name:
     364              if not modal:
     365                  self.__accumNames[name] = 0
     366              if isinstance(name,int):
     367                  name = _ustr(name) # will always return a str, but use _ustr for consistency
     368              self.__name = name
     369              if not (isinstance(toklist, (type(None), basestring, list)) and toklist in (None,'',[])):
     370                  if isinstance(toklist,basestring):
     371                      toklist = [ toklist ]
     372                  if asList:
     373                      if isinstance(toklist,ParseResults):
     374                          self[name] = _ParseResultsWithOffset(toklist.copy(),0)
     375                      else:
     376                          self[name] = _ParseResultsWithOffset(ParseResults(toklist[0]),0)
     377                      self[name].__name = name
     378                  else:
     379                      try:
     380                          self[name] = toklist[0]
     381                      except (KeyError,TypeError,IndexError):
     382                          self[name] = toklist
     383
     384 -    def __getitem__( self, i ):
     385          if isinstance( i, (int,slice) ):
     386              return self.__toklist[i]
     387          else:
     388              if i not in self.__accumNames:
     389                  return self.__tokdict[i][-1][0]
     390              else:
     391                  return ParseResults([ v[0] for v in self.__tokdict[i] ])
     392
     393 -    def __setitem__( self, k, v, isinstance=isinstance ):
     394          if isinstance(v,_ParseResultsWithOffset):
     395              self.__tokdict[k] = self.__tokdict.get(k,list()) + [v]
     396              sub = v[0]
     397          elif isinstance(k,(int,slice)):
     398              self.__toklist[k] = v
     399              sub = v
     400          else:
     401              self.__tokdict[k] = self.__tokdict.get(k,list()) + [_ParseResultsWithOffset(v,0)]
     402              sub = v
     403          if isinstance(sub,ParseResults):
     404              sub.__parent = wkref(self)
     405
     406 -    def __delitem__( self, i ):
     407          if isinstance(i,(int,slice)):
     408              mylen = len( self.__toklist )
     409              del self.__toklist[i]
     410
     411              # convert int to slice
     412              if isinstance(i, int):
     413                  if i < 0:
     414                      i += mylen
     415                  i = slice(i, i+1)
     416              # get removed indices
     417              removed = list(range(*i.indices(mylen)))
     418              removed.reverse()
     419              # fixup indices in token dictionary
     420              for name,occurrences in self.__tokdict.items():
     421                  for j in removed:
     422                      for k, (value, position) in enumerate(occurrences):
     423                          occurrences[k] = _ParseResultsWithOffset(value, position - (position > j))
     424          else:
     425              del self.__tokdict[i]
     426
     427 -    def __contains__( self, k ):
     428          return k in self.__tokdict
     429
     430 -    def __len__( self ): return len( self.__toklist )
     431 -    def __bool__(self): return ( not not self.__toklist )
     432      __nonzero__ = __bool__
     433 -    def __iter__( self ): return iter( self.__toklist )
     434 -    def __reversed__( self ): return iter( self.__toklist[::-1] )
     435 -    def _iterkeys( self ):
     436          if hasattr(self.__tokdict, "iterkeys"):
     437              return self.__tokdict.iterkeys()
     438          else:
     439              return iter(self.__tokdict)
     440
     441 -    def _itervalues( self ):
     442          return (self[k] for k in self._iterkeys())
     443
     444 -    def _iteritems( self ):
     445          return ((k, self[k]) for k in self._iterkeys())
     446
     447      if PY_3:
     448          keys = _iterkeys
     449          """Returns an iterator of all named result keys (Python 3.x only)."""
     450
     451          values = _itervalues
     452          """Returns an iterator of all named result values (Python 3.x only)."""
     453
     454          items = _iteritems
     455          """Returns an iterator of all named result key-value tuples (Python 3.x only)."""
     456
     457      else:
     458          iterkeys = _iterkeys
     459          """Returns an iterator of all named result keys (Python 2.x only)."""
     460
     461          itervalues = _itervalues
     462          """Returns an iterator of all named result values (Python 2.x only)."""
     463
     464          iteritems = _iteritems
     465          """Returns an iterator of all named result key-value tuples (Python 2.x only)."""
     466
     467 -        def keys( self ):
     468              """Returns all named result keys (as a list in Python 2.x, as an iterator in Python 3.x)."""
     469              return list(self.iterkeys())
     470
     471 -        def values( self ):
     472              """Returns all named result values (as a list in Python 2.x, as an iterator in Python 3.x)."""
     473              return list(self.itervalues())
     474
     475 -        def items( self ):
     476              """Returns all named result key-values (as a list of tuples in Python 2.x, as an iterator in Python 3.x)."""
     477              return list(self.iteritems())
     478
     479 -    def haskeys( self ):
     480          """Since keys() returns an iterator, this method is helpful in bypassing
     481             code that looks for the existence of any defined results names."""
     482          return bool(self.__tokdict)
     483
     484 -    def pop( self, *args, **kwargs):
     485          """
     486          Removes and returns item at specified index (default=C{last}).
     487          Supports both C{list} and C{dict} semantics for C{pop()}. If passed no
     488          argument or an integer argument, it will use C{list} semantics
     489          and pop tokens from the list of parsed tokens. If passed a
     490          non-integer argument (most likely a string), it will use C{dict}
     491          semantics and pop the corresponding value from any defined
     492          results names. A second default return value argument is
     493          supported, just as in C{dict.pop()}.
     494
     495          Example::
     496              def remove_first(tokens):
     497                  tokens.pop(0)
     498              print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321']
     499              print(OneOrMore(Word(nums)).addParseAction(remove_first).parseString("0 123 321")) # -> ['123', '321']
     500
     501              label = Word(alphas)
     502              patt = label("LABEL") + OneOrMore(Word(nums))
     503              print(patt.parseString("AAB 123 321").dump())
     504
     505              # Use pop() in a parse action to remove named result (note that corresponding value is not
     506              # removed from list form of results)
     507              def remove_LABEL(tokens):
     508                  tokens.pop("LABEL")
     509                  return tokens
     510              patt.addParseAction(remove_LABEL)
     511              print(patt.parseString("AAB 123 321").dump())
     512          prints::
     513              ['AAB', '123', '321']
     514              - LABEL: AAB
     515
     516              ['AAB', '123', '321']
     517          """
     518          if not args:
     519              args = [-1]
     520          for k,v in kwargs.items():
     521              if k == 'default':
     522                  args = (args[0], v)
     523              else:
     524                  raise TypeError("pop() got an unexpected keyword argument '%s'" % k)
     525          if (isinstance(args[0], int) or
     526                          len(args) == 1 or
     527                          args[0] in self):
     528              index = args[0]
     529              ret = self[index]
     530              del self[index]
     531              return ret
     532          else:
     533              defaultvalue = args[1]
     534              return defaultvalue
     535
     536 -    def get(self, key, defaultValue=None):
     537          """
     538          Returns named result matching the given key, or if there is no
     539          such name, then returns the given C{defaultValue} or C{None} if no
     540          C{defaultValue} is specified.
     541
     542          Similar to C{dict.get()}.
     543
     544          Example::
     545              integer = Word(nums)
     546              date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
     547
     548              result = date_str.parseString("1999/12/31")
     549              print(result.get("year")) # -> '1999'
     550              print(result.get("hour", "not specified")) # -> 'not specified'
     551              print(result.get("hour")) # -> None
     552          """
     553          if key in self:
     554              return self[key]
     555          else:
     556              return defaultValue
     557
     558 -    def insert( self, index, insStr ):
     559          """
     560          Inserts new element at location index in the list of parsed tokens.
     561
     562          Similar to C{list.insert()}.
     563
     564          Example::
     565              print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321']
     566
     567              # use a parse action to insert the parse location in the front of the parsed results
     568              def insert_locn(locn, tokens):
     569                  tokens.insert(0, locn)
     570              print(OneOrMore(Word(nums)).addParseAction(insert_locn).parseString("0 123 321")) # -> [0, '0', '123', '321']
     571          """
     572          self.__toklist.insert(index, insStr)
     573          # fixup indices in token dictionary
     574          for name,occurrences in self.__tokdict.items():
     575              for k, (value, position) in enumerate(occurrences):
     576                  occurrences[k] = _ParseResultsWithOffset(value, position + (position > index))
     577
     578 -    def append( self, item ):
     579          """
     580          Add single element to end of ParseResults list of elements.
     581
     582          Example::
     583              print(OneOrMore(Word(nums)).parseString("0 123 321")) # -> ['0', '123', '321']
     584
     585              # use a parse action to compute the sum of the parsed integers, and add it to the end
     586              def append_sum(tokens):
     587                  tokens.append(sum(map(int, tokens)))
     588              print(OneOrMore(Word(nums)).addParseAction(append_sum).parseString("0 123 321")) # -> ['0', '123', '321', 444]
     589          """
     590          self.__toklist.append(item)
     591
     592 -    def extend( self, itemseq ):
     593          """
     594          Add sequence of elements to end of ParseResults list of elements.
     595
     596          Example::
     597              patt = OneOrMore(Word(alphas))
     598
     599              # use a parse action to append the reverse of the matched strings, to make a palindrome
     600              def make_palindrome(tokens):
     601                  tokens.extend(reversed([t[::-1] for t in tokens]))
     602                  return ''.join(tokens)
     603              print(patt.addParseAction(make_palindrome).parseString("lskdj sdlkjf lksd")) # -> 'lskdjsdlkjflksddsklfjkldsjdksl'
     604          """
     605          if isinstance(itemseq, ParseResults):
     606              self += itemseq
     607          else:
     608              self.__toklist.extend(itemseq)
     609
     610 -    def clear( self ):
     611          """
     612          Clear all elements and results names.
     613          """
     614          del self.__toklist[:]
     615          self.__tokdict.clear()
     616
     617 -    def __getattr__( self, name ):
     618          try:
     619              return self[name]
     620          except KeyError:
     621              return ""
     622
     623          if name in self.__tokdict:
     624              if name not in self.__accumNames:
     625                  return self.__tokdict[name][-1][0]
     626              else:
     627                  return ParseResults([ v[0] for v in self.__tokdict[name] ])
     628          else:
     629              return ""
     630
     631 -    def __add__( self, other ):
     632          ret = self.copy()
     633          ret += other
     634          return ret
     635
     636 -    def __iadd__( self, other ):
     637          if other.__tokdict:
     638              offset = len(self.__toklist)
     639              addoffset = lambda a: offset if a<0 else a+offset
     640              otheritems = other.__tokdict.items()
     641              otherdictitems = [(k, _ParseResultsWithOffset(v[0],addoffset(v[1])) )
     642                                  for (k,vlist) in otheritems for v in vlist]
     643              for k,v in otherdictitems:
     644                  self[k] = v
     645                  if isinstance(v[0],ParseResults):
     646                      v[0].__parent = wkref(self)
     647
     648          self.__toklist += other.__toklist
     649          self.__accumNames.update( other.__accumNames )
     650          return self
     651
     652 -    def __radd__(self, other):
     653          if isinstance(other,int) and other == 0:
     654              # useful for merging many ParseResults using sum() builtin
     655              return self.copy()
     656          else:
     657              # this may raise a TypeError - so be it
     658              return other + self
     659
     660 -    def __repr__( self ):
     661          return "(%s, %s)" % ( repr( self.__toklist ), repr( self.__tokdict ) )
     662
     663 -    def __str__( self ):
     664          return '[' + ', '.join(_ustr(i) if isinstance(i, ParseResults) else repr(i) for i in self.__toklist) + ']'
     665
     666 -    def _asStringList( self, sep='' ):
     667          out = []
     668          for item in self.__toklist:
     669              if out and sep:
     670                  out.append(sep)
     671              if isinstance( item, ParseResults ):
     672                  out += item._asStringList()
     673              else:
     674                  out.append( _ustr(item) )
     675          return out
     676
     677 -    def asList( self ):
     678          """
     679          Returns the parse results as a nested list of matching tokens, all converted to strings.
     680
     681          Example::
     682              patt = OneOrMore(Word(alphas))
     683              result = patt.parseString("sldkj lsdkj sldkj")
     684              # even though the result prints in string-like form, it is actually a pyparsing ParseResults
     685              print(type(result), result) # -> <class 'pyparsing.ParseResults'> ['sldkj', 'lsdkj', 'sldkj']
     686
     687              # Use asList() to create an actual list
     688              result_list = result.asList()
     689              print(type(result_list), result_list) # -> <class 'list'> ['sldkj', 'lsdkj', 'sldkj']
     690          """
     691          return [res.asList() if isinstance(res,ParseResults) else res for res in self.__toklist]
     692
     693 -    def asDict( self ):
     694          """
     695          Returns the named parse results as a nested dictionary.
     696
     697          Example::
     698              integer = Word(nums)
     699              date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
     700
     701              result = date_str.parseString('12/31/1999')
     702              print(type(result), repr(result)) # -> <class 'pyparsing.ParseResults'> (['12', '/', '31', '/', '1999'], {'day': [('1999', 4)], 'year': [('12', 0)], 'month': [('31', 2)]})
     703
     704              result_dict = result.asDict()
     705              print(type(result_dict), repr(result_dict)) # -> <class 'dict'> {'day': '1999', 'year': '12', 'month': '31'}
     706
     707              # even though a ParseResults supports dict-like access, sometime you just need to have a dict
     708              import json
     709              print(json.dumps(result)) # -> Exception: TypeError: ... is not JSON serializable
     710              print(json.dumps(result.asDict())) # -> {"month": "31", "day": "1999", "year": "12"}
     711          """
     712          if PY_3:
     713              item_fn = self.items
     714          else:
     715              item_fn = self.iteritems
     716
     717          def toItem(obj):
     718              if isinstance(obj, ParseResults):
     719                  if obj.haskeys():
     720                      return obj.asDict()
     721                  else:
     722                      return [toItem(v) for v in obj]
     723              else:
     724                  return obj
     725
     726          return dict((k,toItem(v)) for k,v in item_fn())
     727
     728 -    def copy( self ):
     729          """
     730          Returns a new copy of a C{ParseResults} object.
     731          """
     732          ret = ParseResults( self.__toklist )
     733          ret.__tokdict = self.__tokdict.copy()
     734          ret.__parent = self.__parent
     735          ret.__accumNames.update( self.__accumNames )
     736          ret.__name = self.__name
     737          return ret
     738
     739 -    def asXML( self, doctag=None, namedItemsOnly=False, indent="", formatted=True ):
     740          """
     741          (Deprecated) Returns the parse results as XML. Tags are created for tokens and lists that have defined results names.
     742          """
     743          nl = "\n"
     744          out = []
     745          namedItems = dict((v[1],k) for (k,vlist) in self.__tokdict.items()
     746                                                              for v in vlist)
     747          nextLevelIndent = indent + "  "
     748
     749          # collapse out indents if formatting is not desired
     750          if not formatted:
     751              indent = ""
     752              nextLevelIndent = ""
     753              nl = ""
     754
     755          selfTag = None
     756          if doctag is not None:
     757              selfTag = doctag
     758          else:
     759              if self.__name:
     760                  selfTag = self.__name
     761
     762          if not selfTag:
     763              if namedItemsOnly:
     764                  return ""
     765              else:
     766                  selfTag = "ITEM"
     767
     768          out += [ nl, indent, "<", selfTag, ">" ]
     769
     770          for i,res in enumerate(self.__toklist):
     771              if isinstance(res,ParseResults):
     772                  if i in namedItems:
     773                      out += [ res.asXML(namedItems[i],
     774                                          namedItemsOnly and doctag is None,
     775                                          nextLevelIndent,
     776                                          formatted)]
     777                  else:
     778                      out += [ res.asXML(None,
     779                                          namedItemsOnly and doctag is None,
     780                                          nextLevelIndent,
     781                                          formatted)]
     782              else:
     783                  # individual token, see if there is a name for it
     784                  resTag = None
     785                  if i in namedItems:
     786                      resTag = namedItems[i]
     787                  if not resTag:
     788                      if namedItemsOnly:
     789                          continue
     790                      else:
     791                          resTag = "ITEM"
     792                  xmlBodyText = _xml_escape(_ustr(res))
     793                  out += [ nl, nextLevelIndent, "<", resTag, ">",
     794                                                  xmlBodyText,
     795                                                  "</", resTag, ">" ]
     796
     797          out += [ nl, indent, "</", selfTag, ">" ]
     798          return "".join(out)
     799
     800 -    def __lookup(self,sub):
     801          for k,vlist in self.__tokdict.items():
     802              for v,loc in vlist:
     803                  if sub is v:
     804                      return k
     805          return None
     806
     807 -    def getName(self):
     808          """
     809          Returns the results name for this token expression. Useful when several
     810          different expressions might match at a particular location.
     811
     812          Example::
     813              integer = Word(nums)
     814              ssn_expr = Regex(r"\d\d\d-\d\d-\d\d\d\d")
     815              house_number_expr = Suppress('#') + Word(nums, alphanums)
     816              user_data = (Group(house_number_expr)("house_number")
     817                          | Group(ssn_expr)("ssn")
     818                          | Group(integer)("age"))
     819              user_info = OneOrMore(user_data)
     820
     821              result = user_info.parseString("22 111-22-3333 #221B")
     822              for item in result:
     823                  print(item.getName(), ':', item[0])
     824          prints::
     825              age : 22
     826              ssn : 111-22-3333
     827              house_number : 221B
     828          """
     829          if self.__name:
     830              return self.__name
     831          elif self.__parent:
     832              par = self.__parent()
     833              if par:
     834                  return par.__lookup(self)
     835              else:
     836                  return None
     837          elif (len(self) == 1 and
     838                 len(self.__tokdict) == 1 and
     839                 self.__tokdict.values()[0][0][1] in (0,-1)):
     840              return self.__tokdict.keys()[0]
     841          else:
     842              return None
     843
     844 -    def dump(self, indent='', depth=0, full=True):
     845          """
     846          Diagnostic method for listing out the contents of a C{ParseResults}.
     847          Accepts an optional C{indent} argument so that this string can be embedded
     848          in a nested display of other data.
     849
     850          Example::
     851              integer = Word(nums)
     852              date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
     853
     854              result = date_str.parseString('12/31/1999')
     855              print(result.dump())
     856          prints::
     857              ['12', '/', '31', '/', '1999']
     858              - day: 1999
     859              - month: 31
     860              - year: 12
     861          """
     862          out = []
     863          NL = '\n'
     864          out.append( indent+_ustr(self.asList()) )
     865          if full:
     866              if self.haskeys():
     867                  items = sorted(self.items())
     868                  for k,v in items:
     869                      if out:
     870                          out.append(NL)
     871                      out.append( "%s%s- %s: " % (indent,('  '*depth), k) )
     872                      if isinstance(v,ParseResults):
     873                          if v:
     874                              out.append( v.dump(indent,depth+1) )
     875                          else:
     876                              out.append(_ustr(v))
     877                      else:
     878                          out.append(_ustr(v))
     879              elif any(isinstance(vv,ParseResults) for vv in self):
     880                  v = self
     881                  for i,vv in enumerate(v):
     882                      if isinstance(vv,ParseResults):
     883                          out.append("\n%s%s[%d]:\n%s%s%s" % (indent,('  '*(depth)),i,indent,('  '*(depth+1)),vv.dump(indent,depth+1) ))
     884                      else:
     885                          out.append("\n%s%s[%d]:\n%s%s%s" % (indent,('  '*(depth)),i,indent,('  '*(depth+1)),_ustr(vv)))
     886
     887          return "".join(out)
     888
     889 -    def pprint(self, *args, **kwargs):
     890          """
     891          Pretty-printer for parsed results as a list, using the C{pprint} module.
     892          Accepts additional positional or keyword args as defined for the
     893          C{pprint.pprint} method. (U{http://docs.python.org/3/library/pprint.html#pprint.pprint})
     894
     895          Example::
     896              ident = Word(alphas, alphanums)
     897              num = Word(nums)
     898              func = Forward()
     899              term = ident | num | Group('(' + func + ')')
     900              func <<= ident + Group(Optional(delimitedList(term)))
     901              result = func.parseString("fna a,b,(fnb c,d,200),100")
     902              result.pprint(width=40)
     903          prints::
     904              ['fna',
     905               ['a',
     906                'b',
     907                ['(', 'fnb', ['c', 'd', '200'], ')'],
     908                '100']]
     909          """
     910          pprint.pprint(self.asList(), *args, **kwargs)
     911
     912      # add support for pickle protocol
     913 -    def __getstate__(self):
     914          return ( self.__toklist,
     915                   ( self.__tokdict.copy(),
     916                     self.__parent is not None and self.__parent() or None,
     917                     self.__accumNames,
     918                     self.__name ) )
     919
     920 -    def __setstate__(self,state):
     921          self.__toklist = state[0]
     922          (self.__tokdict,
     923           par,
     924           inAccumNames,
     925           self.__name) = state[1]
     926          self.__accumNames = {}
     927          self.__accumNames.update(inAccumNames)
     928          if par is not None:
     929              self.__parent = wkref(par)
     930          else:
     931              self.__parent = None
     932
     933 -    def __getnewargs__(self):
     934          return self.__toklist, self.__name, self.__asList, self.__modal
     935
     936 -    def __dir__(self):
     937          return (dir(type(self)) + list(self.keys()))
     938
     939  collections.MutableMapping.register(ParseResults)
     940
     941 -def col (loc,strg):
     942      """Returns current column within a string, counting newlines as line separators.
     943     The first column is number 1.
     944
     945     Note: the default parsing behavior is to expand tabs in the input string
     946     before starting the parsing process.  See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information
     947     on parsing strings containing C{<TAB>}s, and suggested methods to maintain a
     948     consistent view of the parsed string, the parse location, and line and column
     949     positions within the parsed string.
     950     """
     951      s = strg
     952      return 1 if loc<len(s) and s[loc] == '\n' else loc - s.rfind("\n", 0, loc)
     953
     954 -def lineno(loc,strg):
     955      """Returns current line number within a string, counting newlines as line separators.
     956     The first line is number 1.
     957
     958     Note: the default parsing behavior is to expand tabs in the input string
     959     before starting the parsing process.  See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information
     960     on parsing strings containing C{<TAB>}s, and suggested methods to maintain a
     961     consistent view of the parsed string, the parse location, and line and column
     962     positions within the parsed string.
     963     """
     964      return strg.count("\n",0,loc) + 1
     965
     966 -def line( loc, strg ):
     967      """Returns the line of text containing loc within a string, counting newlines as line separators.
     968         """
     969      lastCR = strg.rfind("\n", 0, loc)
     970      nextCR = strg.find("\n", loc)
     971      if nextCR >= 0:
     972          return strg[lastCR+1:nextCR]
     973      else:
     974          return strg[lastCR+1:]
     975
     976 -def _defaultStartDebugAction( instring, loc, expr ):
     977      print (("Match " + _ustr(expr) + " at loc " + _ustr(loc) + "(%d,%d)" % ( lineno(loc,instring), col(loc,instring) )))
     978
     979 -def _defaultSuccessDebugAction( instring, startloc, endloc, expr, toks ):
     980      print ("Matched " + _ustr(expr) + " -> " + str(toks.asList()))
     981
     982 -def _defaultExceptionDebugAction( instring, loc, expr, exc ):
     983      print ("Exception raised:" + _ustr(exc))
     984
     985 -def nullDebugAction(*args):
     986      """'Do-nothing' debug action, to suppress debugging output during parsing."""
     987      pass
     988
     989  # Only works on Python 3.x - nonlocal is toxic to Python 2 installs
     990  #~ 'decorator to trim function calls to match the arity of the target'
     991  #~ def _trim_arity(func, maxargs=3):
     992      #~ if func in singleArgBuiltins:
     993          #~ return lambda s,l,t: func(t)
     994      #~ limit = 0
     995      #~ foundArity = False
     996      #~ def wrapper(*args):
     997          #~ nonlocal limit,foundArity
     998          #~ while 1:
     999              #~ try:
    1000                  #~ ret = func(*args[limit:])
    1001                  #~ foundArity = True
    1002                  #~ return ret
    1003              #~ except TypeError:
    1004                  #~ if limit == maxargs or foundArity:
    1005                      #~ raise
    1006                  #~ limit += 1
    1007                  #~ continue
    1008      #~ return wrapper
    1009
    1010  # this version is Python 2.x-3.x cross-compatible
    1011  'decorator to trim function calls to match the arity of the target'
    1012 -def _trim_arity(func, maxargs=2):
    1013      if func in singleArgBuiltins:
    1014          return lambda s,l,t: func(t)
    1015      limit = [0]
    1016      foundArity = [False]
    1017
    1018      # traceback return data structure changed in Py3.5 - normalize back to plain tuples
    1019      if system_version[:2] >= (3,5):
    1020          def extract_stack(limit=0):
    1021              # special handling for Python 3.5.0 - extra deep call stack by 1
    1022              offset = -3 if system_version == (3,5,0) else -2
    1023              frame_summary = traceback.extract_stack(limit=-offset+limit-1)[offset]
    1024              return [(frame_summary.filename, frame_summary.lineno)]
    1025          def extract_tb(tb, limit=0):
    1026              frames = traceback.extract_tb(tb, limit=limit)
    1027              frame_summary = frames[-1]
    1028              return [(frame_summary.filename, frame_summary.lineno)]
    1029      else:
    1030          extract_stack = traceback.extract_stack
    1031          extract_tb = traceback.extract_tb
    1032
    1033      # synthesize what would be returned by traceback.extract_stack at the call to
    1034      # user's parse action 'func', so that we don't incur call penalty at parse time
    1035
    1036      LINE_DIFF = 6
    1037      # IF ANY CODE CHANGES, EVEN JUST COMMENTS OR BLANK LINES, BETWEEN THE NEXT LINE AND
    1038      # THE CALL TO FUNC INSIDE WRAPPER, LINE_DIFF MUST BE MODIFIED!!!!
    1039      this_line = extract_stack(limit=2)[-1]
    1040      pa_call_line_synth = (this_line[0], this_line[1]+LINE_DIFF)
    1041
    1042      def wrapper(*args):
    1043          while 1:
    1044              try:
    1045                  ret = func(*args[limit[0]:])
    1046                  foundArity[0] = True
    1047                  return ret
    1048              except TypeError:
    1049                  # re-raise TypeErrors if they did not come from our arity testing
    1050                  if foundArity[0]:
    1051                      raise
    1052                  else:
    1053                      try:
    1054                          tb = sys.exc_info()[-1]
    1055                          if not extract_tb(tb, limit=2)[-1][:2] == pa_call_line_synth:
    1056                              raise
    1057                      finally:
    1058                          del tb
    1059
    1060                  if limit[0] <= maxargs:
    1061                      limit[0] += 1
    1062                      continue
    1063                  raise
    1064
    1065      # copy func name to wrapper for sensible debug output
    1066      func_name = "<parse action>"
    1067      try:
    1068          func_name = getattr(func, '__name__',
    1069                              getattr(func, '__class__').__name__)
    1070      except Exception:
    1071          func_name = str(func)
    1072      wrapper.__name__ = func_name
    1073
    1074      return wrapper
    1075
    1076 -class ParserElement(object):
    1077      """Abstract base level parser element class."""
    1078      DEFAULT_WHITE_CHARS = " \n\t\r"
    1079      verbose_stacktrace = False
    1080
    1081      @staticmethod
    1082 -    def setDefaultWhitespaceChars( chars ):
    1083          r"""
    1084          Overrides the default whitespace chars
    1085
    1086          Example::
    1087              # default whitespace chars are space, <TAB> and newline
    1088              OneOrMore(Word(alphas)).parseString("abc def\nghi jkl")  # -> ['abc', 'def', 'ghi', 'jkl']
    1089
    1090              # change to just treat newline as significant
    1091              ParserElement.setDefaultWhitespaceChars(" \t")
    1092              OneOrMore(Word(alphas)).parseString("abc def\nghi jkl")  # -> ['abc', 'def']
    1093          """
    1094          ParserElement.DEFAULT_WHITE_CHARS = chars
    1095
    1096      @staticmethod
    1097 -    def inlineLiteralsUsing(cls):
    1098          """
    1099          Set class to be used for inclusion of string literals into a parser.
    1100
    1101          Example::
    1102              # default literal class used is Literal
    1103              integer = Word(nums)
    1104              date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
    1105
    1106              date_str.parseString("1999/12/31")  # -> ['1999', '/', '12', '/', '31']
    1107
    1108
    1109              # change to Suppress
    1110              ParserElement.inlineLiteralsUsing(Suppress)
    1111              date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
    1112
    1113              date_str.parseString("1999/12/31")  # -> ['1999', '12', '31']
    1114          """
    1115          ParserElement._literalStringClass = cls
    1116
    1117 -    def __init__( self, savelist=False ):
    1118          self.parseAction = list()
    1119          self.failAction = None
    1120          #~ self.name = "<unknown>"  # don't define self.name, let subclasses try/except upcall
    1121          self.strRepr = None
    1122          self.resultsName = None
    1123          self.saveAsList = savelist
    1124          self.skipWhitespace = True
    1125          self.whiteChars = ParserElement.DEFAULT_WHITE_CHARS
    1126          self.copyDefaultWhiteChars = True
    1127          self.mayReturnEmpty = False # used when checking for left-recursion
    1128          self.keepTabs = False
    1129          self.ignoreExprs = list()
    1130          self.debug = False
    1131          self.streamlined = False
    1132          self.mayIndexError = True # used to optimize exception handling for subclasses that don't advance parse index
    1133          self.errmsg = ""
    1134          self.modalResults = True # used to mark results names as modal (report only last) or cumulative (list all)
    1135          self.debugActions = ( None, None, None ) #custom debug actions
    1136          self.re = None
    1137          self.callPreparse = True # used to avoid redundant calls to preParse
    1138          self.callDuringTry = False
    1139
    1140 -    def copy( self ):
    1141          """
    1142          Make a copy of this C{ParserElement}.  Useful for defining different parse actions
    1143          for the same parsing pattern, using copies of the original parse element.
    1144
    1145          Example::
    1146              integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
    1147              integerK = integer.copy().addParseAction(lambda toks: toks[0]*1024) + Suppress("K")
    1148              integerM = integer.copy().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
    1149
    1150              print(OneOrMore(integerK | integerM | integer).parseString("5K 100 640K 256M"))
    1151          prints::
    1152              [5120, 100, 655360, 268435456]
    1153          Equivalent form of C{expr.copy()} is just C{expr()}::
    1154              integerM = integer().addParseAction(lambda toks: toks[0]*1024*1024) + Suppress("M")
    1155          """
    1156          cpy = copy.copy( self )
    1157          cpy.parseAction = self.parseAction[:]
    1158          cpy.ignoreExprs = self.ignoreExprs[:]
    1159          if self.copyDefaultWhiteChars:
    1160              cpy.whiteChars = ParserElement.DEFAULT_WHITE_CHARS
    1161          return cpy
    1162
    1163 -    def setName( self, name ):
    1164          """
    1165          Define name for this expression, makes debugging and exception messages clearer.
    1166
    1167          Example::
    1168              Word(nums).parseString("ABC")  # -> Exception: Expected W:(0123...) (at char 0), (line:1, col:1)
    1169              Word(nums).setName("integer").parseString("ABC")  # -> Exception: Expected integer (at char 0), (line:1, col:1)
    1170          """
    1171          self.name = name
    1172          self.errmsg = "Expected " + self.name
    1173          if hasattr(self,"exception"):
    1174              self.exception.msg = self.errmsg
    1175          return self
    1176
    1177 -    def setResultsName( self, name, listAllMatches=False ):
    1178          """
    1179          Define name for referencing matching tokens as a nested attribute
    1180          of the returned parse results.
    1181          NOTE: this returns a *copy* of the original C{ParserElement} object;
    1182          this is so that the client can define a basic element, such as an
    1183          integer, and reference it in multiple places with different names.
    1184
    1185          You can also set results names using the abbreviated syntax,
    1186          C{expr("name")} in place of C{expr.setResultsName("name")} -
    1187          see L{I{__call__}<__call__>}.
    1188
    1189          Example::
    1190              date_str = (integer.setResultsName("year") + '/'
    1191                          + integer.setResultsName("month") + '/'
    1192                          + integer.setResultsName("day"))
    1193
    1194              # equivalent form:
    1195              date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
    1196          """
    1197          newself = self.copy()
    1198          if name.endswith("*"):
    1199              name = name[:-1]
    1200              listAllMatches=True
    1201          newself.resultsName = name
    1202          newself.modalResults = not listAllMatches
    1203          return newself
    1204
    1205 -    def setBreak(self,breakFlag = True):
    1206          """Method to invoke the Python pdb debugger when this element is
    1207             about to be parsed. Set C{breakFlag} to True to enable, False to
    1208             disable.
    1209          """
    1210          if breakFlag:
    1211              _parseMethod = self._parse
    1212              def breaker(instring, loc, doActions=True, callPreParse=True):
    1213                  import pdb
    1214                  pdb.set_trace()
    1215                  return _parseMethod( instring, loc, doActions, callPreParse )
    1216              breaker._originalParseMethod = _parseMethod
    1217              self._parse = breaker
    1218          else:
    1219              if hasattr(self._parse,"_originalParseMethod"):
    1220                  self._parse = self._parse._originalParseMethod
    1221          return self
    1222
    1223 -    def setParseAction( self, *fns, **kwargs ):
    1224          """
    1225          Define action to perform when successfully matching parse element definition.
    1226          Parse action fn is a callable method with 0-3 arguments, called as C{fn(s,loc,toks)},
    1227          C{fn(loc,toks)}, C{fn(toks)}, or just C{fn()}, where:
    1228           - s   = the original string being parsed (see note below)
    1229           - loc = the location of the matching substring
    1230           - toks = a list of the matched tokens, packaged as a C{L{ParseResults}} object
    1231          If the functions in fns modify the tokens, they can return them as the return
    1232          value from fn, and the modified list of tokens will replace the original.
    1233          Otherwise, fn does not need to return any value.
    1234
    1235          Optional keyword arguments:
    1236           - callDuringTry = (default=C{False}) indicate if parse action should be run during lookaheads and alternate testing
    1237
    1238          Note: the default parsing behavior is to expand tabs in the input string
    1239          before starting the parsing process.  See L{I{parseString}<parseString>} for more information
    1240          on parsing strings containing C{<TAB>}s, and suggested methods to maintain a
    1241          consistent view of the parsed string, the parse location, and line and column
    1242          positions within the parsed string.
    1243
    1244          Example::
    1245              integer = Word(nums)
    1246              date_str = integer + '/' + integer + '/' + integer
    1247
    1248              date_str.parseString("1999/12/31")  # -> ['1999', '/', '12', '/', '31']
    1249
    1250              # use parse action to convert to ints at parse time
    1251              integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
    1252              date_str = integer + '/' + integer + '/' + integer
    1253
    1254              # note that integer fields are now ints, not strings
    1255              date_str.parseString("1999/12/31")  # -> [1999, '/', 12, '/', 31]
    1256          """
    1257          self.parseAction = list(map(_trim_arity, list(fns)))
    1258          self.callDuringTry = kwargs.get("callDuringTry", False)
    1259          return self
    1260
    1261 -    def addParseAction( self, *fns, **kwargs ):
    1262          """
    1263          Add parse action to expression's list of parse actions. See L{I{setParseAction}<setParseAction>}.
    1264
    1265          See examples in L{I{copy}<copy>}.
    1266          """
    1267          self.parseAction += list(map(_trim_arity, list(fns)))
    1268          self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False)
    1269          return self
    1270
    1271 -    def addCondition(self, *fns, **kwargs):
    1272          """Add a boolean predicate function to expression's list of parse actions. See
    1273          L{I{setParseAction}<setParseAction>} for function call signatures. Unlike C{setParseAction},
    1274          functions passed to C{addCondition} need to return boolean success/fail of the condition.
    1275
    1276          Optional keyword arguments:
    1277           - message = define a custom message to be used in the raised exception
    1278           - fatal   = if True, will raise ParseFatalException to stop parsing immediately; otherwise will raise ParseException
    1279
    1280          Example::
    1281              integer = Word(nums).setParseAction(lambda toks: int(toks[0]))
    1282              year_int = integer.copy()
    1283              year_int.addCondition(lambda toks: toks[0] >= 2000, message="Only support years 2000 and later")
    1284              date_str = year_int + '/' + integer + '/' + integer
    1285
    1286              result = date_str.parseString("1999/12/31")  # -> Exception: Only support years 2000 and later (at char 0), (line:1, col:1)
    1287          """
    1288          msg = kwargs.get("message", "failed user-defined condition")
    1289          exc_type = ParseFatalException if kwargs.get("fatal", False) else ParseException
    1290          for fn in fns:
    1291              def pa(s,l,t):
    1292                  if not bool(_trim_arity(fn)(s,l,t)):
    1293                      raise exc_type(s,l,msg)
    1294              self.parseAction.append(pa)
    1295          self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False)
    1296          return self
    1297
    1298 -    def setFailAction( self, fn ):
    1299          """Define action to perform if parsing fails at this expression.
    1300             Fail acton fn is a callable function that takes the arguments
    1301             C{fn(s,loc,expr,err)} where:
    1302              - s = string being parsed
    1303              - loc = location where expression match was attempted and failed
    1304              - expr = the parse expression that failed
    1305              - err = the exception thrown
    1306             The function returns no value.  It may throw C{L{ParseFatalException}}
    1307             if it is desired to stop parsing immediately."""
    1308          self.failAction = fn
    1309          return self
    1310
    1311 -    def _skipIgnorables( self, instring, loc ):
    1312          exprsFound = True
    1313          while exprsFound:
    1314              exprsFound = False
    1315              for e in self.ignoreExprs:
    1316                  try:
    1317                      while 1:
    1318                          loc,dummy = e._parse( instring, loc )
    1319                          exprsFound = True
    1320                  except ParseException:
    1321                      pass
    1322          return loc
    1323
    1324 -    def preParse( self, instring, loc ):
    1325          if self.ignoreExprs:
    1326              loc = self._skipIgnorables( instring, loc )
    1327
    1328          if self.skipWhitespace:
    1329              wt = self.whiteChars
    1330              instrlen = len(instring)
    1331              while loc < instrlen and instring[loc] in wt:
    1332                  loc += 1
    1333
    1334          return loc
    1335
    1336 -    def parseImpl( self, instring, loc, doActions=True ):
    1337          return loc, []
    1338
    1339 -    def postParse( self, instring, loc, tokenlist ):
    1340          return tokenlist
    1341
    1342      #~ @profile
    1343 -    def _parseNoCache( self, instring, loc, doActions=True, callPreParse=True ):
    1344          debugging = ( self.debug ) #and doActions )
    1345
    1346          if debugging or self.failAction:
    1347              #~ print ("Match",self,"at loc",loc,"(%d,%d)" % ( lineno(loc,instring), col(loc,instring) ))
    1348              if (self.debugActions[0] ):
    1349                  self.debugActions[0]( instring, loc, self )
    1350              if callPreParse and self.callPreparse:
    1351                  preloc = self.preParse( instring, loc )
    1352              else:
    1353                  preloc = loc
    1354              tokensStart = preloc
    1355              try:
    1356                  try:
    1357                      loc,tokens = self.parseImpl( instring, preloc, doActions )
    1358                  except IndexError:
    1359                      raise ParseException( instring, len(instring), self.errmsg, self )
    1360              except ParseBaseException as err:
    1361                  #~ print ("Exception raised:", err)
    1362                  if self.debugActions[2]:
    1363                      self.debugActions[2]( instring, tokensStart, self, err )
    1364                  if self.failAction:
    1365                      self.failAction( instring, tokensStart, self, err )
    1366                  raise
    1367          else:
    1368              if callPreParse and self.callPreparse:
    1369                  preloc = self.preParse( instring, loc )
    1370              else:
    1371                  preloc = loc
    1372              tokensStart = preloc
    1373              if self.mayIndexError or loc >= len(instring):
    1374                  try:
    1375                      loc,tokens = self.parseImpl( instring, preloc, doActions )
    1376                  except IndexError:
    1377                      raise ParseException( instring, len(instring), self.errmsg, self )
    1378              else:
    1379                  loc,tokens = self.parseImpl( instring, preloc, doActions )
    1380
    1381          tokens = self.postParse( instring, loc, tokens )
    1382
    1383          retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList, modal=self.modalResults )
    1384          if self.parseAction and (doActions or self.callDuringTry):
    1385              if debugging:
    1386                  try:
    1387                      for fn in self.parseAction:
    1388                          tokens = fn( instring, tokensStart, retTokens )
    1389                          if tokens is not None:
    1390                              retTokens = ParseResults( tokens,
    1391                                                        self.resultsName,
    1392                                                        asList=self.saveAsList and isinstance(tokens,(ParseResults,list)),
    1393                                                        modal=self.modalResults )
    1394                  except ParseBaseException as err:
    1395                      #~ print "Exception raised in user parse action:", err
    1396                      if (self.debugActions[2] ):
    1397                          self.debugActions[2]( instring, tokensStart, self, err )
    1398                      raise
    1399              else:
    1400                  for fn in self.parseAction:
    1401                      tokens = fn( instring, tokensStart, retTokens )
    1402                      if tokens is not None:
    1403                          retTokens = ParseResults( tokens,
    1404                                                    self.resultsName,
    1405                                                    asList=self.saveAsList and isinstance(tokens,(ParseResults,list)),
    1406                                                    modal=self.modalResults )
    1407
    1408          if debugging:
    1409              #~ print ("Matched",self,"->",retTokens.asList())
    1410              if (self.debugActions[1] ):
    1411                  self.debugActions[1]( instring, tokensStart, loc, self, retTokens )
    1412
    1413          return loc, retTokens
    1414
    1415 -    def tryParse( self, instring, loc ):
    1416          try:
    1417              return self._parse( instring, loc, doActions=False )[0]
    1418          except ParseFatalException:
    1419              raise ParseException( instring, loc, self.errmsg, self)
    1420
    1421 -    def canParseNext(self, instring, loc):
    1422          try:
    1423              self.tryParse(instring, loc)
    1424          except (ParseException, IndexError):
    1425              return False
    1426          else:
    1427              return True
    1428
    1429 -    class _UnboundedCache(object):
    1430 -        def __init__(self):
    1431              cache = {}
    1432              self.not_in_cache = not_in_cache = object()
    1433
    1434              def get(self, key):
    1435                  return cache.get(key, not_in_cache)
    1436
    1437              def set(self, key, value):
    1438                  cache[key] = value
    1439
    1440              def clear(self):
    1441                  cache.clear()
    1442
    1443              self.get = types.MethodType(get, self)
    1444              self.set = types.MethodType(set, self)
    1445              self.clear = types.MethodType(clear, self)
    1446
    1447      if _OrderedDict is not None:
    1448 -        class _FifoCache(object):
    1449 -            def __init__(self, size):
    1450                  self.not_in_cache = not_in_cache = object()
    1451
    1452                  cache = _OrderedDict()
    1453
    1454                  def get(self, key):
    1455                      return cache.get(key, not_in_cache)
    1456
    1457                  def set(self, key, value):
    1458                      cache[key] = value
    1459                      if len(cache) > size:
    1460                          cache.popitem(False)
    1461
    1462                  def clear(self):
    1463                      cache.clear()
    1464
    1465                  self.get = types.MethodType(get, self)
    1466                  self.set = types.MethodType(set, self)
    1467                  self.clear = types.MethodType(clear, self)
    1468
    1469      else:
    1470 -        class _FifoCache(object):
    1471 -            def __init__(self, size):
    1472                  self.not_in_cache = not_in_cache = object()
    1473
    1474                  cache = {}
    1475                  key_fifo = collections.deque([], size)
    1476
    1477                  def get(self, key):
    1478                      return cache.get(key, not_in_cache)
    1479
    1480                  def set(self, key, value):
    1481                      cache[key] = value
    1482                      if len(cache) > size:
    1483                          cache.pop(key_fifo.popleft(), None)
    1484                      key_fifo.append(key)
    1485
    1486                  def clear(self):
    1487                      cache.clear()
    1488                      key_fifo.clear()
    1489
    1490                  self.get = types.MethodType(get, self)
    1491                  self.set = types.MethodType(set, self)
    1492                  self.clear = types.MethodType(clear, self)
    1493
    1494      # argument cache for optimizing repeated calls when backtracking through recursive expressions
    1495      packrat_cache = {} # this is set later by enabledPackrat(); this is here so that resetCache() doesn't fail
    1496      packrat_cache_lock = RLock()
    1497      packrat_cache_stats = [0, 0]
    1498
    1499      # this method gets repeatedly called during backtracking with the same arguments -
    1500      # we can cache these arguments and save ourselves the trouble of re-parsing the contained expression
    1501 -    def _parseCache( self, instring, loc, doActions=True, callPreParse=True ):
    1502          HIT, MISS = 0, 1
    1503          lookup = (self, instring, loc, callPreParse, doActions)
    1504          with ParserElement.packrat_cache_lock:
    1505              cache = ParserElement.packrat_cache
    1506              value = cache.get(lookup)
    1507              if value is cache.not_in_cache:
    1508                  ParserElement.packrat_cache_stats[MISS] += 1
    1509                  try:
    1510                      value = self._parseNoCache(instring, loc, doActions, callPreParse)
    1511                  except ParseBaseException as pe:
    1512                      # cache a copy of the exception, without the traceback
    1513                      cache.set(lookup, pe.__class__(*pe.args))
    1514                      raise
    1515                  else:
    1516                      cache.set(lookup, (value[0], value[1].copy()))
    1517                      return value
    1518              else:
    1519                  ParserElement.packrat_cache_stats[HIT] += 1
    1520                  if isinstance(value, Exception):
    1521                      raise value
    1522                  return (value[0], value[1].copy())
    1523
    1524      _parse = _parseNoCache
    1525
    1526      @staticmethod
    1527 -    def resetCache():
    1528          ParserElement.packrat_cache.clear()
    1529          ParserElement.packrat_cache_stats[:] = [0] * len(ParserElement.packrat_cache_stats)
    1530
    1531      _packratEnabled = False
    1532      @staticmethod
    1533 -    def enablePackrat(cache_size_limit=128):
    1534          """Enables "packrat" parsing, which adds memoizing to the parsing logic.
    1535             Repeated parse attempts at the same string location (which happens
    1536             often in many complex grammars) can immediately return a cached value,
    1537             instead of re-executing parsing/validating code.  Memoizing is done of
    1538             both valid results and parsing exceptions.
    1539
    1540             Parameters:
    1541              - cache_size_limit - (default=C{128}) - if an integer value is provided
    1542                will limit the size of the packrat cache; if None is passed, then
    1543                the cache size will be unbounded; if 0 is passed, the cache will
    1544                be effectively disabled.
    1545
    1546             This speedup may break existing programs that use parse actions that
    1547             have side-effects.  For this reason, packrat parsing is disabled when
    1548             you first import pyparsing.  To activate the packrat feature, your
    1549             program must call the class method C{ParserElement.enablePackrat()}.  If
    1550             your program uses C{psyco} to "compile as you go", you must call
    1551             C{enablePackrat} before calling C{psyco.full()}.  If you do not do this,
    1552             Python will crash.  For best results, call C{enablePackrat()} immediately
    1553             after importing pyparsing.
    1554
    1555             Example::
    1556                 import pyparsing
    1557                 pyparsing.ParserElement.enablePackrat()
    1558          """
    1559          if not ParserElement._packratEnabled:
    1560              ParserElement._packratEnabled = True
    1561              if cache_size_limit is None:
    1562                  ParserElement.packrat_cache = ParserElement._UnboundedCache()
    1563              else:
    1564                  ParserElement.packrat_cache = ParserElement._FifoCache(cache_size_limit)
    1565              ParserElement._parse = ParserElement._parseCache
    1566
    1567 -    def parseString( self, instring, parseAll=False ):
    1568          """
    1569          Execute the parse expression with the given string.
    1570          This is the main interface to the client code, once the complete
    1571          expression has been built.
    1572
    1573          If you want the grammar to require that the entire input string be
    1574          successfully parsed, then set C{parseAll} to True (equivalent to ending
    1575          the grammar with C{L{StringEnd()}}).
    1576
    1577          Note: C{parseString} implicitly calls C{expandtabs()} on the input string,
    1578          in order to report proper column numbers in parse actions.
    1579          If the input string contains tabs and
    1580          the grammar uses parse actions that use the C{loc} argument to index into the
    1581          string being parsed, you can ensure you have a consistent view of the input
    1582          string by:
    1583           - calling C{parseWithTabs} on your grammar before calling C{parseString}
    1584             (see L{I{parseWithTabs}<parseWithTabs>})
    1585           - define your parse action using the full C{(s,loc,toks)} signature, and
    1586             reference the input string using the parse action's C{s} argument
    1587           - explictly expand the tabs in your input string before calling
    1588             C{parseString}
    1589
    1590          Example::
    1591              Word('a').parseString('aaaaabaaa')  # -> ['aaaaa']
    1592              Word('a').parseString('aaaaabaaa', parseAll=True)  # -> Exception: Expected end of text
    1593          """
    1594          ParserElement.resetCache()
    1595          if not self.streamlined:
    1596              self.streamline()
    1597              #~ self.saveAsList = True
    1598          for e in self.ignoreExprs:
    1599              e.streamline()
    1600          if not self.keepTabs:
    1601              instring = instring.expandtabs()
    1602          try:
    1603              loc, tokens = self._parse( instring, 0 )
    1604              if parseAll:
    1605                  loc = self.preParse( instring, loc )
    1606                  se = Empty() + StringEnd()
    1607                  se._parse( instring, loc )
    1608          except ParseBaseException as exc:
    1609              if ParserElement.verbose_stacktrace:
    1610                  raise
    1611              else:
    1612                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1613                  raise exc
    1614          else:
    1615              return tokens
    1616
    1617 -    def scanString( self, instring, maxMatches=_MAX_INT, overlap=False ):
    1618          """
    1619          Scan the input string for expression matches.  Each match will return the
    1620          matching tokens, start location, and end location.  May be called with optional
    1621          C{maxMatches} argument, to clip scanning after 'n' matches are found.  If
    1622          C{overlap} is specified, then overlapping matches will be reported.
    1623
    1624          Note that the start and end locations are reported relative to the string
    1625          being parsed.  See L{I{parseString}<parseString>} for more information on parsing
    1626          strings with embedded tabs.
    1627
    1628          Example::
    1629              source = "sldjf123lsdjjkf345sldkjf879lkjsfd987"
    1630              print(source)
    1631              for tokens,start,end in Word(alphas).scanString(source):
    1632                  print(' '*start + '^'*(end-start))
    1633                  print(' '*start + tokens[0])
    1634
    1635          prints::
    1636
    1637              sldjf123lsdjjkf345sldkjf879lkjsfd987
    1638              ^^^^^
    1639              sldjf
    1640                      ^^^^^^^
    1641                      lsdjjkf
    1642                                ^^^^^^
    1643                                sldkjf
    1644                                         ^^^^^^
    1645                                         lkjsfd
    1646          """
    1647          if not self.streamlined:
    1648              self.streamline()
    1649          for e in self.ignoreExprs:
    1650              e.streamline()
    1651
    1652          if not self.keepTabs:
    1653              instring = _ustr(instring).expandtabs()
    1654          instrlen = len(instring)
    1655          loc = 0
    1656          preparseFn = self.preParse
    1657          parseFn = self._parse
    1658          ParserElement.resetCache()
    1659          matches = 0
    1660          try:
    1661              while loc <= instrlen and matches < maxMatches:
    1662                  try:
    1663                      preloc = preparseFn( instring, loc )
    1664                      nextLoc,tokens = parseFn( instring, preloc, callPreParse=False )
    1665                  except ParseException:
    1666                      loc = preloc+1
    1667                  else:
    1668                      if nextLoc > loc:
    1669                          matches += 1
    1670                          yield tokens, preloc, nextLoc
    1671                          if overlap:
    1672                              nextloc = preparseFn( instring, loc )
    1673                              if nextloc > loc:
    1674                                  loc = nextLoc
    1675                              else:
    1676                                  loc += 1
    1677                          else:
    1678                              loc = nextLoc
    1679                      else:
    1680                          loc = preloc+1
    1681          except ParseBaseException as exc:
    1682              if ParserElement.verbose_stacktrace:
    1683                  raise
    1684              else:
    1685                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1686                  raise exc
    1687
    1688 -    def transformString( self, instring ):
    1689          """
    1690          Extension to C{L{scanString}}, to modify matching text with modified tokens that may
    1691          be returned from a parse action.  To use C{transformString}, define a grammar and
    1692          attach a parse action to it that modifies the returned token list.
    1693          Invoking C{transformString()} on a target string will then scan for matches,
    1694          and replace the matched text patterns according to the logic in the parse
    1695          action.  C{transformString()} returns the resulting transformed string.
    1696
    1697          Example::
    1698              wd = Word(alphas)
    1699              wd.setParseAction(lambda toks: toks[0].title())
    1700
    1701              print(wd.transformString("now is the winter of our discontent made glorious summer by this sun of york."))
    1702          Prints::
    1703              Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York.
    1704          """
    1705          out = []
    1706          lastE = 0
    1707          # force preservation of <TAB>s, to minimize unwanted transformation of string, and to
    1708          # keep string locs straight between transformString and scanString
    1709          self.keepTabs = True
    1710          try:
    1711              for t,s,e in self.scanString( instring ):
    1712                  out.append( instring[lastE:s] )
    1713                  if t:
    1714                      if isinstance(t,ParseResults):
    1715                          out += t.asList()
    1716                      elif isinstance(t,list):
    1717                          out += t
    1718                      else:
    1719                          out.append(t)
    1720                  lastE = e
    1721              out.append(instring[lastE:])
    1722              out = [o for o in out if o]
    1723              return "".join(map(_ustr,_flatten(out)))
    1724          except ParseBaseException as exc:
    1725              if ParserElement.verbose_stacktrace:
    1726                  raise
    1727              else:
    1728                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1729                  raise exc
    1730
    1731 -    def searchString( self, instring, maxMatches=_MAX_INT ):
    1732          """
    1733          Another extension to C{L{scanString}}, simplifying the access to the tokens found
    1734          to match the given parse expression.  May be called with optional
    1735          C{maxMatches} argument, to clip searching after 'n' matches are found.
    1736
    1737          Example::
    1738              # a capitalized word starts with an uppercase letter, followed by zero or more lowercase letters
    1739              cap_word = Word(alphas.upper(), alphas.lower())
    1740
    1741              print(cap_word.searchString("More than Iron, more than Lead, more than Gold I need Electricity"))
    1742          prints::
    1743              ['More', 'Iron', 'Lead', 'Gold', 'I']
    1744          """
    1745          try:
    1746              return ParseResults([ t for t,s,e in self.scanString( instring, maxMatches ) ])
    1747          except ParseBaseException as exc:
    1748              if ParserElement.verbose_stacktrace:
    1749                  raise
    1750              else:
    1751                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1752                  raise exc
    1753
    1754 -    def split(self, instring, maxsplit=_MAX_INT, includeSeparators=False):
    1755          """
    1756          Generator method to split a string using the given expression as a separator.
    1757          May be called with optional C{maxsplit} argument, to limit the number of splits;
    1758          and the optional C{includeSeparators} argument (default=C{False}), if the separating
    1759          matching text should be included in the split results.
    1760
    1761          Example::
    1762              punc = oneOf(list(".,;:/-!?"))
    1763              print(list(punc.split("This, this?, this sentence, is badly punctuated!")))
    1764          prints::
    1765              ['This', ' this', '', ' this sentence', ' is badly punctuated', '']
    1766          """
    1767          splits = 0
    1768          last = 0
    1769          for t,s,e in self.scanString(instring, maxMatches=maxsplit):
    1770              yield instring[last:s]
    1771              if includeSeparators:
    1772                  yield t[0]
    1773              last = e
    1774          yield instring[last:]
    1775
    1776 -    def __add__(self, other ):
    1777          """
    1778          Implementation of + operator - returns C{L{And}}
    1779          """
    1780          if isinstance( other, basestring ):
    1781              other = ParserElement._literalStringClass( other )
    1782          if not isinstance( other, ParserElement ):
    1783              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1784                      SyntaxWarning, stacklevel=2)
    1785              return None
    1786          return And( [ self, other ] )
    1787
    1788 -    def __radd__(self, other ):
    1789          """
    1790          Implementation of + operator when left operand is not a C{L{ParserElement}}
    1791          """
    1792          if isinstance( other, basestring ):
    1793              other = ParserElement._literalStringClass( other )
    1794          if not isinstance( other, ParserElement ):
    1795              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1796                      SyntaxWarning, stacklevel=2)
    1797              return None
    1798          return other + self
    1799
    1800 -    def __sub__(self, other):
    1801          """
    1802          Implementation of - operator, returns C{L{And}} with error stop
    1803          """
    1804          if isinstance( other, basestring ):
    1805              other = ParserElement._literalStringClass( other )
    1806          if not isinstance( other, ParserElement ):
    1807              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1808                      SyntaxWarning, stacklevel=2)
    1809              return None
    1810          return And( [ self, And._ErrorStop(), other ] )
    1811
    1812 -    def __rsub__(self, other ):
    1813          """
    1814          Implementation of - operator when left operand is not a C{L{ParserElement}}
    1815          """
    1816          if isinstance( other, basestring ):
    1817              other = ParserElement._literalStringClass( other )
    1818          if not isinstance( other, ParserElement ):
    1819              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1820                      SyntaxWarning, stacklevel=2)
    1821              return None
    1822          return other - self
    1823
    1824 -    def __mul__(self,other):
    1825          """
    1826          Implementation of * operator, allows use of C{expr * 3} in place of
    1827          C{expr + expr + expr}.  Expressions may also me multiplied by a 2-integer
    1828          tuple, similar to C{{min,max}} multipliers in regular expressions.  Tuples
    1829          may also include C{None} as in:
    1830           - C{expr*(n,None)} or C{expr*(n,)} is equivalent
    1831                to C{expr*n + L{ZeroOrMore}(expr)}
    1832                (read as "at least n instances of C{expr}")
    1833           - C{expr*(None,n)} is equivalent to C{expr*(0,n)}
    1834                (read as "0 to n instances of C{expr}")
    1835           - C{expr*(None,None)} is equivalent to C{L{ZeroOrMore}(expr)}
    1836           - C{expr*(1,None)} is equivalent to C{L{OneOrMore}(expr)}
    1837
    1838          Note that C{expr*(None,n)} does not raise an exception if
    1839          more than n exprs exist in the input stream; that is,
    1840          C{expr*(None,n)} does not enforce a maximum number of expr
    1841          occurrences.  If this behavior is desired, then write
    1842          C{expr*(None,n) + ~expr}
    1843          """
    1844          if isinstance(other,int):
    1845              minElements, optElements = other,0
    1846          elif isinstance(other,tuple):
    1847              other = (other + (None, None))[:2]
    1848              if other[0] is None:
    1849                  other = (0, other[1])
    1850              if isinstance(other[0],int) and other[1] is None:
    1851                  if other[0] == 0:
    1852                      return ZeroOrMore(self)
    1853                  if other[0] == 1:
    1854                      return OneOrMore(self)
    1855                  else:
    1856                      return self*other[0] + ZeroOrMore(self)
    1857              elif isinstance(other[0],int) and isinstance(other[1],int):
    1858                  minElements, optElements = other
    1859                  optElements -= minElements
    1860              else:
    1861                  raise TypeError("cannot multiply 'ParserElement' and ('%s','%s') objects", type(other[0]),type(other[1]))
    1862          else:
    1863              raise TypeError("cannot multiply 'ParserElement' and '%s' objects", type(other))
    1864
    1865          if minElements < 0:
    1866              raise ValueError("cannot multiply ParserElement by negative value")
    1867          if optElements < 0:
    1868              raise ValueError("second tuple value must be greater or equal to first tuple value")
    1869          if minElements == optElements == 0:
    1870              raise ValueError("cannot multiply ParserElement by 0 or (0,0)")
    1871
    1872          if (optElements):
    1873              def makeOptionalList(n):
    1874                  if n>1:
    1875                      return Optional(self + makeOptionalList(n-1))
    1876                  else:
    1877                      return Optional(self)
    1878              if minElements:
    1879                  if minElements == 1:
    1880                      ret = self + makeOptionalList(optElements)
    1881                  else:
    1882                      ret = And([self]*minElements) + makeOptionalList(optElements)
    1883              else:
    1884                  ret = makeOptionalList(optElements)
    1885          else:
    1886              if minElements == 1:
    1887                  ret = self
    1888              else:
    1889                  ret = And([self]*minElements)
    1890          return ret
    1891
    1892 -    def __rmul__(self, other):
    1893          return self.__mul__(other)
    1894
    1895 -    def __or__(self, other ):
    1896          """
    1897          Implementation of | operator - returns C{L{MatchFirst}}
    1898          """
    1899          if isinstance( other, basestring ):
    1900              other = ParserElement._literalStringClass( other )
    1901          if not isinstance( other, ParserElement ):
    1902              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1903                      SyntaxWarning, stacklevel=2)
    1904              return None
    1905          return MatchFirst( [ self, other ] )
    1906
    1907 -    def __ror__(self, other ):
    1908          """
    1909          Implementation of | operator when left operand is not a C{L{ParserElement}}
    1910          """
    1911          if isinstance( other, basestring ):
    1912              other = ParserElement._literalStringClass( other )
    1913          if not isinstance( other, ParserElement ):
    1914              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1915                      SyntaxWarning, stacklevel=2)
    1916              return None
    1917          return other | self
    1918
    1919 -    def __xor__(self, other ):
    1920          """
    1921          Implementation of ^ operator - returns C{L{Or}}
    1922          """
    1923          if isinstance( other, basestring ):
    1924              other = ParserElement._literalStringClass( other )
    1925          if not isinstance( other, ParserElement ):
    1926              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1927                      SyntaxWarning, stacklevel=2)
    1928              return None
    1929          return Or( [ self, other ] )
    1930
    1931 -    def __rxor__(self, other ):
    1932          """
    1933          Implementation of ^ operator when left operand is not a C{L{ParserElement}}
    1934          """
    1935          if isinstance( other, basestring ):
    1936              other = ParserElement._literalStringClass( other )
    1937          if not isinstance( other, ParserElement ):
    1938              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1939                      SyntaxWarning, stacklevel=2)
    1940              return None
    1941          return other ^ self
    1942
    1943 -    def __and__(self, other ):
    1944          """
    1945          Implementation of & operator - returns C{L{Each}}
    1946          """
    1947          if isinstance( other, basestring ):
    1948              other = ParserElement._literalStringClass( other )
    1949          if not isinstance( other, ParserElement ):
    1950              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1951                      SyntaxWarning, stacklevel=2)
    1952              return None
    1953          return Each( [ self, other ] )
    1954
    1955 -    def __rand__(self, other ):
    1956          """
    1957          Implementation of & operator when left operand is not a C{L{ParserElement}}
    1958          """
    1959          if isinstance( other, basestring ):
    1960              other = ParserElement._literalStringClass( other )
    1961          if not isinstance( other, ParserElement ):
    1962              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1963                      SyntaxWarning, stacklevel=2)
    1964              return None
    1965          return other & self
    1966
    1967 -    def __invert__( self ):
    1968          """
    1969          Implementation of ~ operator - returns C{L{NotAny}}
    1970          """
    1971          return NotAny( self )
    1972
    1973 -    def __call__(self, name=None):
    1974          """
    1975          Shortcut for C{L{setResultsName}}, with C{listAllMatches=default}.
    1976
    1977          If C{name} is given with a trailing C{'*'} character, then C{listAllMatches} will be
    1978          passed as C{True}.
    1979
    1980          If C{name} is omitted, same as calling C{L{copy}}.
    1981
    1982          Example::
    1983              # these are equivalent
    1984              userdata = Word(alphas).setResultsName("name") + Word(nums+"-").setResultsName("socsecno")
    1985              userdata = Word(alphas)("name") + Word(nums+"-")("socsecno")
    1986          """
    1987          if name is not None:
    1988              return self.setResultsName(name)
    1989          else:
    1990              return self.copy()
    1991
    1992 -    def suppress( self ):
    1993          """
    1994          Suppresses the output of this C{ParserElement}; useful to keep punctuation from
    1995          cluttering up returned output.
    1996          """
    1997          return Suppress( self )
    1998
    1999 -    def leaveWhitespace( self ):
    2000          """
    2001          Disables the skipping of whitespace before matching the characters in the
    2002          C{ParserElement}'s defined pattern.  This is normally only used internally by
    2003          the pyparsing module, but may be needed in some whitespace-sensitive grammars.
    2004          """
    2005          self.skipWhitespace = False
    2006          return self
    2007
    2008 -    def setWhitespaceChars( self, chars ):
    2009          """
    2010          Overrides the default whitespace chars
    2011          """
    2012          self.skipWhitespace = True
    2013          self.whiteChars = chars
    2014          self.copyDefaultWhiteChars = False
    2015          return self
    2016
    2017 -    def parseWithTabs( self ):
    2018          """
    2019          Overrides default behavior to expand C{<TAB>}s to spaces before parsing the input string.
    2020          Must be called before C{parseString} when the input grammar contains elements that
    2021          match C{<TAB>} characters.
    2022          """
    2023          self.keepTabs = True
    2024          return self
    2025
    2026 -    def ignore( self, other ):
    2027          """
    2028          Define expression to be ignored (e.g., comments) while doing pattern
    2029          matching; may be called repeatedly, to define multiple comment or other
    2030          ignorable patterns.
    2031
    2032          Example::
    2033              patt = OneOrMore(Word(alphas))
    2034              patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj']
    2035
    2036              patt.ignore(cStyleComment)
    2037              patt.parseString('ablaj /* comment */ lskjd') # -> ['ablaj', 'lskjd']
    2038          """
    2039          if isinstance(other, basestring):
    2040              other = Suppress(other)
    2041
    2042          if isinstance( other, Suppress ):
    2043              if other not in self.ignoreExprs:
    2044                  self.ignoreExprs.append(other)
    2045          else:
    2046              self.ignoreExprs.append( Suppress( other.copy() ) )
    2047          return self
    2048
    2049 -    def setDebugActions( self, startAction, successAction, exceptionAction ):
    2050          """
    2051          Enable display of debugging messages while doing pattern matching.
    2052          """
    2053          self.debugActions = (startAction or _defaultStartDebugAction,
    2054                               successAction or _defaultSuccessDebugAction,
    2055                               exceptionAction or _defaultExceptionDebugAction)
    2056          self.debug = True
    2057          return self
    2058
    2059 -    def setDebug( self, flag=True ):
    2060          """
    2061          Enable display of debugging messages while doing pattern matching.
    2062          Set C{flag} to True to enable, False to disable.
    2063
    2064          Example::
    2065              wd = Word(alphas).setName("alphaword")
    2066              integer = Word(nums).setName("numword")
    2067              term = wd | integer
    2068
    2069              # turn on debugging for wd
    2070              wd.setDebug()
    2071
    2072              OneOrMore(term).parseString("abc 123 xyz 890")
    2073
    2074          prints::
    2075              Match alphaword at loc 0(1,1)
    2076              Matched alphaword -> ['abc']
    2077              Match alphaword at loc 3(1,4)
    2078              Exception raised:Expected alphaword (at char 4), (line:1, col:5)
    2079              Match alphaword at loc 7(1,8)
    2080              Matched alphaword -> ['xyz']
    2081              Match alphaword at loc 11(1,12)
    2082              Exception raised:Expected alphaword (at char 12), (line:1, col:13)
    2083              Match alphaword at loc 15(1,16)
    2084              Exception raised:Expected alphaword (at char 15), (line:1, col:16)
    2085
    2086          The output shown is that produced by the default debug actions. Prior to attempting
    2087          to match the C{wd} expression, the debugging message C{"Match <exprname> at loc <n>(<line>,<col>)"}
    2088          is shown. Then if the parse succeeds, a C{"Matched"} message is shown, or an C{"Exception raised"}
    2089          message is shown. Also note the use of L{setName} to assign a human-readable name to the expression,
    2090          which makes debugging and exception messages easier to understand - for instance, the default
    2091          name created for the C{Word} expression without calling C{setName} is C{"W:(ABCD...)"}.
    2092          """
    2093          if flag:
    2094              self.setDebugActions( _defaultStartDebugAction, _defaultSuccessDebugAction, _defaultExceptionDebugAction )
    2095          else:
    2096              self.debug = False
    2097          return self
    2098
    2099 -    def __str__( self ):
    2100          return self.name
    2101
    2102 -    def __repr__( self ):
    2103          return _ustr(self)
    2104
    2105 -    def streamline( self ):
    2106          self.streamlined = True
    2107          self.strRepr = None
    2108          return self
    2109
    2110 -    def checkRecursion( self, parseElementList ):
    2111          pass
    2112
    2113 -    def validate( self, validateTrace=[] ):
    2114          """
    2115          Check defined expressions for valid structure, check for infinite recursive definitions.
    2116          """
    2117          self.checkRecursion( [] )
    2118
    2119 -    def parseFile( self, file_or_filename, parseAll=False ):
    2120          """
    2121          Execute the parse expression on the given file or filename.
    2122          If a filename is specified (instead of a file object),
    2123          the entire file is opened, read, and closed before parsing.
    2124          """
    2125          try:
    2126              file_contents = file_or_filename.read()
    2127          except AttributeError:
    2128              with open(file_or_filename, "r") as f:
    2129                  file_contents = f.read()
    2130          try:
    2131              return self.parseString(file_contents, parseAll)
    2132          except ParseBaseException as exc:
    2133              if ParserElement.verbose_stacktrace:
    2134                  raise
    2135              else:
    2136                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    2137                  raise exc
    2138
    2139 -    def __eq__(self,other):
    2140          if isinstance(other, ParserElement):
    2141              return self is other or vars(self) == vars(other)
    2142          elif isinstance(other, basestring):
    2143              return self.matches(other)
    2144          else:
    2145              return super(ParserElement,self)==other
    2146
    2147 -    def __ne__(self,other):
    2148          return not (self == other)
    2149
    2150 -    def __hash__(self):
    2151          return hash(id(self))
    2152
    2153 -    def __req__(self,other):
    2154          return self == other
    2155
    2156 -    def __rne__(self,other):
    2157          return not (self == other)
    2158
    2159 -    def matches(self, testString, parseAll=True):
    2160          """
    2161          Method for quick testing of a parser against a test string. Good for simple
    2162          inline microtests of sub expressions while building up larger parser.0
    2163
    2164          Parameters:
    2165           - testString - to test against this expression for a match
    2166           - parseAll - (default=C{True}) - flag to pass to C{L{parseString}} when running tests
    2167
    2168          Example::
    2169              expr = Word(nums)
    2170              assert expr.matches("100")
    2171          """
    2172          try:
    2173              self.parseString(_ustr(testString), parseAll=parseAll)
    2174              return True
    2175          except ParseBaseException:
    2176              return False
    2177
    2178 -    def runTests(self, tests, parseAll=True, comment='#', fullDump=True, printResults=True, failureTests=False):
    2179          """
    2180          Execute the parse expression on a series of test strings, showing each
    2181          test, the parsed results or where the parse failed. Quick and easy way to
    2182          run a parse expression against a list of sample strings.
    2183
    2184          Parameters:
    2185           - tests - a list of separate test strings, or a multiline string of test strings
    2186           - parseAll - (default=C{True}) - flag to pass to C{L{parseString}} when running tests
    2187           - comment - (default=C{'#'}) - expression for indicating embedded comments in the test
    2188                string; pass None to disable comment filtering
    2189           - fullDump - (default=C{True}) - dump results as list followed by results names in nested outline;
    2190                if False, only dump nested list
    2191           - printResults - (default=C{True}) prints test output to stdout
    2192           - failureTests - (default=C{False}) indicates if these tests are expected to fail parsing
    2193
    2194          Returns: a (success, results) tuple, where success indicates that all tests succeeded
    2195          (or failed if C{failureTests} is True), and the results contain a list of lines of each
    2196          test's output
    2197
    2198          Example::
    2199              number_expr = pyparsing_common.number.copy()
    2200
    2201              result = number_expr.runTests('''
    2202                  # unsigned integer
    2203                  100
    2204                  # negative integer
    2205                  -100
    2206                  # float with scientific notation
    2207                  6.02e23
    2208                  # integer with scientific notation
    2209                  1e-12
    2210                  ''')
    2211              print("Success" if result[0] else "Failed!")
    2212
    2213              result = number_expr.runTests('''
    2214                  # stray character
    2215                  100Z
    2216                  # missing leading digit before '.'
    2217                  -.100
    2218                  # too many '.'
    2219                  3.14.159
    2220                  ''', failureTests=True)
    2221              print("Success" if result[0] else "Failed!")
    2222          prints::
    2223              # unsigned integer
    2224              100
    2225              [100]
    2226
    2227              # negative integer
    2228              -100
    2229              [-100]
    2230
    2231              # float with scientific notation
    2232              6.02e23
    2233              [6.02e+23]
    2234
    2235              # integer with scientific notation
    2236              1e-12
    2237              [1e-12]
    2238
    2239              Success
    2240
    2241              # stray character
    2242              100Z
    2243                 ^
    2244              FAIL: Expected end of text (at char 3), (line:1, col:4)
    2245
    2246              # missing leading digit before '.'
    2247              -.100
    2248              ^
    2249              FAIL: Expected {real number with scientific notation | real number | signed integer} (at char 0), (line:1, col:1)
    2250
    2251              # too many '.'
    2252              3.14.159
    2253                  ^
    2254              FAIL: Expected end of text (at char 4), (line:1, col:5)
    2255
    2256              Success
    2257          """
    2258          if isinstance(tests, basestring):
    2259              tests = list(map(str.strip, tests.rstrip().splitlines()))
    2260          if isinstance(comment, basestring):
    2261              comment = Literal(comment)
    2262          allResults = []
    2263          comments = []
    2264          success = True
    2265          for t in tests:
    2266              if comment is not None and comment.matches(t, False) or comments and not t:
    2267                  comments.append(t)
    2268                  continue
    2269              if not t:
    2270                  continue
    2271              out = ['\n'.join(comments), t]
    2272              comments = []
    2273              try:
    2274                  result = self.parseString(t, parseAll=parseAll)
    2275                  out.append(result.dump(full=fullDump))
    2276                  success = success and not failureTests
    2277              except ParseBaseException as pe:
    2278                  fatal = "(FATAL)" if isinstance(pe, ParseFatalException) else ""
    2279                  if '\n' in t:
    2280                      out.append(line(pe.loc, t))
    2281                      out.append(' '*(col(pe.loc,t)-1) + '^' + fatal)
    2282                  else:
    2283                      out.append(' '*pe.loc + '^' + fatal)
    2284                  out.append("FAIL: " + str(pe))
    2285                  success = success and failureTests
    2286                  result = pe
    2287              except Exception as exc:
    2288                  out.append("FAIL-EXCEPTION: " + str(exc))
    2289                  success = success and failureTests
    2290                  result = exc
    2291
    2292              if printResults:
    2293                  if fullDump:
    2294                      out.append('')
    2295                  print('\n'.join(out))
    2296
    2297              allResults.append((t, result))
    2298
    2299          return success, allResults
    2300
    2301
    2302 -class Token(ParserElement):
    2303      """
    2304      Abstract C{ParserElement} subclass, for defining atomic matching patterns.
    2305      """
    2306 -    def __init__( self ):
    2307          super(Token,self).__init__( savelist=False )
    2308
    2309
    2310 -class Empty(Token):
    2311      """
    2312      An empty token, will always match.
    2313      """
    2314 -    def __init__( self ):
    2315          super(Empty,self).__init__()
    2316          self.name = "Empty"
    2317          self.mayReturnEmpty = True
    2318          self.mayIndexError = False
    2319
    2320
    2321 -class NoMatch(Token):
    2322      """
    2323      A token that will never match.
    2324      """
    2325 -    def __init__( self ):
    2326          super(NoMatch,self).__init__()
    2327          self.name = "NoMatch"
    2328          self.mayReturnEmpty = True
    2329          self.mayIndexError = False
    2330          self.errmsg = "Unmatchable token"
    2331
    2332 -    def parseImpl( self, instring, loc, doActions=True ):
    2333          raise ParseException(instring, loc, self.errmsg, self)
    2334
    2335
    2336 -class Literal(Token):
    2337      """
    2338      Token to exactly match a specified string.
    2339
    2340      Example::
    2341          Literal('blah').parseString('blah')  # -> ['blah']
    2342          Literal('blah').parseString('blahfooblah')  # -> ['blah']
    2343          Literal('blah').parseString('bla')  # -> Exception: Expected "blah"
    2344
    2345      For case-insensitive matching, use L{CaselessLiteral}.
    2346
    2347      For keyword matching (force word break before and after the matched string),
    2348      use L{Keyword} or L{CaselessKeyword}.
    2349      """
    2350 -    def __init__( self, matchString ):
    2351          super(Literal,self).__init__()
    2352          self.match = matchString
    2353          self.matchLen = len(matchString)
    2354          try:
    2355              self.firstMatchChar = matchString[0]
    2356          except IndexError:
    2357              warnings.warn("null string passed to Literal; use Empty() instead",
    2358                              SyntaxWarning, stacklevel=2)
    2359              self.__class__ = Empty
    2360          self.name = '"%s"' % _ustr(self.match)
    2361          self.errmsg = "Expected " + self.name
    2362          self.mayReturnEmpty = False
    2363          self.mayIndexError = False
    2364
    2365      # Performance tuning: this routine gets called a *lot*
    2366      # if this is a single character match string  and the first character matches,
    2367      # short-circuit as quickly as possible, and avoid calling startswith
    2368      #~ @profile
    2369 -    def parseImpl( self, instring, loc, doActions=True ):
    2370          if (instring[loc] == self.firstMatchChar and
    2371              (self.matchLen==1 or instring.startswith(self.match,loc)) ):
    2372              return loc+self.matchLen, self.match
    2373          raise ParseException(instring, loc, self.errmsg, self)
    2374  _L = Literal
    2375  ParserElement._literalStringClass = Literal
    2376
    2377 -class Keyword(Token):
    2378      """
    2379      Token to exactly match a specified string as a keyword, that is, it must be
    2380      immediately followed by a non-keyword character.  Compare with C{L{Literal}}:
    2381       - C{Literal("if")} will match the leading C{'if'} in C{'ifAndOnlyIf'}.
    2382       - C{Keyword("if")} will not; it will only match the leading C{'if'} in C{'if x=1'}, or C{'if(y==2)'}
    2383      Accepts two optional constructor arguments in addition to the keyword string:
    2384       - C{identChars} is a string of characters that would be valid identifier characters,
    2385            defaulting to all alphanumerics + "_" and "$"
    2386       - C{caseless} allows case-insensitive matching, default is C{False}.
    2387
    2388      Example::
    2389          Keyword("start").parseString("start")  # -> ['start']
    2390          Keyword("start").parseString("starting")  # -> Exception
    2391
    2392      For case-insensitive matching, use L{CaselessKeyword}.
    2393      """
    2394      DEFAULT_KEYWORD_CHARS = alphanums+"_$"
    2395
    2396 -    def __init__( self, matchString, identChars=DEFAULT_KEYWORD_CHARS, caseless=False ):
    2397          super(Keyword,self).__init__()
    2398          self.match = matchString
    2399          self.matchLen = len(matchString)
    2400          try:
    2401              self.firstMatchChar = matchString[0]
    2402          except IndexError:
    2403              warnings.warn("null string passed to Keyword; use Empty() instead",
    2404                              SyntaxWarning, stacklevel=2)
    2405          self.name = '"%s"' % self.match
    2406          self.errmsg = "Expected " + self.name
    2407          self.mayReturnEmpty = False
    2408          self.mayIndexError = False
    2409          self.caseless = caseless
    2410          if caseless:
    2411              self.caselessmatch = matchString.upper()
    2412              identChars = identChars.upper()
    2413          self.identChars = set(identChars)
    2414
    2415 -    def parseImpl( self, instring, loc, doActions=True ):
    2416          if self.caseless:
    2417              if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and
    2418                   (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) and
    2419                   (loc == 0 or instring[loc-1].upper() not in self.identChars) ):
    2420                  return loc+self.matchLen, self.match
    2421          else:
    2422              if (instring[loc] == self.firstMatchChar and
    2423                  (self.matchLen==1 or instring.startswith(self.match,loc)) and
    2424                  (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen] not in self.identChars) and
    2425                  (loc == 0 or instring[loc-1] not in self.identChars) ):
    2426                  return loc+self.matchLen, self.match
    2427          raise ParseException(instring, loc, self.errmsg, self)
    2428
    2429 -    def copy(self):
    2430          c = super(Keyword,self).copy()
    2431          c.identChars = Keyword.DEFAULT_KEYWORD_CHARS
    2432          return c
    2433
    2434      @staticmethod
    2435 -    def setDefaultKeywordChars( chars ):
    2436          """Overrides the default Keyword chars
    2437          """
    2438          Keyword.DEFAULT_KEYWORD_CHARS = chars
    2439
    2440 -class CaselessLiteral(Literal):
    2441      """
    2442      Token to match a specified string, ignoring case of letters.
    2443      Note: the matched results will always be in the case of the given
    2444      match string, NOT the case of the input text.
    2445
    2446      Example::
    2447          OneOrMore(CaselessLiteral("CMD")).parseString("cmd CMD Cmd10") # -> ['CMD', 'CMD', 'CMD']
    2448
    2449      (Contrast with example for L{CaselessKeyword}.)
    2450      """
    2451 -    def __init__( self, matchString ):
    2452          super(CaselessLiteral,self).__init__( matchString.upper() )
    2453          # Preserve the defining literal.
    2454          self.returnString = matchString
    2455          self.name = "'%s'" % self.returnString
    2456          self.errmsg = "Expected " + self.name
    2457
    2458 -    def parseImpl( self, instring, loc, doActions=True ):
    2459          if instring[ loc:loc+self.matchLen ].upper() == self.match:
    2460              return loc+self.matchLen, self.returnString
    2461          raise ParseException(instring, loc, self.errmsg, self)
    2462
    2463 -class CaselessKeyword(Keyword):
    2464      """
    2465      Caseless version of L{Keyword}.
    2466
    2467      Example::
    2468          OneOrMore(CaselessKeyword("CMD")).parseString("cmd CMD Cmd10") # -> ['CMD', 'CMD']
    2469
    2470      (Contrast with example for L{CaselessLiteral}.)
    2471      """
    2472 -    def __init__( self, matchString, identChars=Keyword.DEFAULT_KEYWORD_CHARS ):
    2473          super(CaselessKeyword,self).__init__( matchString, identChars, caseless=True )
    2474
    2475 -    def parseImpl( self, instring, loc, doActions=True ):
    2476          if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and
    2477               (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) ):
    2478              return loc+self.matchLen, self.match
    2479          raise ParseException(instring, loc, self.errmsg, self)
    2480
    2481 -class Word(Token):
    2482      """
    2483      Token for matching words composed of allowed character sets.
    2484      Defined with string containing all allowed initial characters,
    2485      an optional string containing allowed body characters (if omitted,
    2486      defaults to the initial character set), and an optional minimum,
    2487      maximum, and/or exact length.  The default value for C{min} is 1 (a
    2488      minimum value < 1 is not valid); the default values for C{max} and C{exact}
    2489      are 0, meaning no maximum or exact length restriction. An optional
    2490      C{excludeChars} parameter can list characters that might be found in
    2491      the input C{bodyChars} string; useful to define a word of all printables
    2492      except for one or two characters, for instance.
    2493
    2494      L{srange} is useful for defining custom character set strings for defining
    2495      C{Word} expressions, using range notation from regular expression character sets.
    2496
    2497      A common mistake is to use C{Word} to match a specific literal string, as in
    2498      C{Word("Address")}. Remember that C{Word} uses the string argument to define
    2499      I{sets} of matchable characters. This expression would match "Add", "AAA",
    2500      "dAred", or any other word made up of the characters 'A', 'd', 'r', 'e', and 's'.
    2501      To match an exact literal string, use L{Literal} or L{Keyword}.
    2502
    2503      pyparsing includes helper strings for building Words:
    2504       - L{alphas}
    2505       - L{nums}
    2506       - L{alphanums}
    2507       - L{hexnums}
    2508       - L{alphas8bit} (alphabetic characters in ASCII range 128-255 - accented, tilded, umlauted, etc.)
    2509       - L{punc8bit} (non-alphabetic characters in ASCII range 128-255 - currency, symbols, superscripts, diacriticals, etc.)
    2510       - L{printables} (any non-whitespace character)
    2511
    2512      Example::
    2513          # a word composed of digits
    2514          integer = Word(nums) # equivalent to Word("0123456789") or Word(srange("0-9"))
    2515
    2516          # a word with a leading capital, and zero or more lowercase
    2517          capital_word = Word(alphas.upper(), alphas.lower())
    2518
    2519          # hostnames are alphanumeric, with leading alpha, and '-'
    2520          hostname = Word(alphas, alphanums+'-')
    2521
    2522          # roman numeral (not a strict parser, accepts invalid mix of characters)
    2523          roman = Word("IVXLCDM")
    2524
    2525          # any string of non-whitespace characters, except for ','
    2526          csv_value = Word(printables, excludeChars=",")
    2527      """
    2528 -    def __init__( self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None ):
    2529          super(Word,self).__init__()
    2530          if excludeChars:
    2531              initChars = ''.join(c for c in initChars if c not in excludeChars)
    2532              if bodyChars:
    2533                  bodyChars = ''.join(c for c in bodyChars if c not in excludeChars)
    2534          self.initCharsOrig = initChars
    2535          self.initChars = set(initChars)
    2536          if bodyChars :
    2537              self.bodyCharsOrig = bodyChars
    2538              self.bodyChars = set(bodyChars)
    2539          else:
    2540              self.bodyCharsOrig = initChars
    2541              self.bodyChars = set(initChars)
    2542
    2543          self.maxSpecified = max > 0
    2544
    2545          if min < 1:
    2546              raise ValueError("cannot specify a minimum length < 1; use Optional(Word()) if zero-length word is permitted")
    2547
    2548          self.minLen = min
    2549
    2550          if max > 0:
    2551              self.maxLen = max
    2552          else:
    2553              self.maxLen = _MAX_INT
    2554
    2555          if exact > 0:
    2556              self.maxLen = exact
    2557              self.minLen = exact
    2558
    2559          self.name = _ustr(self)
    2560          self.errmsg = "Expected " + self.name
    2561          self.mayIndexError = False
    2562          self.asKeyword = asKeyword
    2563
    2564          if ' ' not in self.initCharsOrig+self.bodyCharsOrig and (min==1 and max==0 and exact==0):
    2565              if self.bodyCharsOrig == self.initCharsOrig:
    2566                  self.reString = "[%s]+" % _escapeRegexRangeChars(self.initCharsOrig)
    2567              elif len(self.initCharsOrig) == 1:
    2568                  self.reString = "%s[%s]*" % \
    2569                                        (re.escape(self.initCharsOrig),
    2570                                        _escapeRegexRangeChars(self.bodyCharsOrig),)
    2571              else:
    2572                  self.reString = "[%s][%s]*" % \
    2573                                        (_escapeRegexRangeChars(self.initCharsOrig),
    2574                                        _escapeRegexRangeChars(self.bodyCharsOrig),)
    2575              if self.asKeyword:
    2576                  self.reString = r"\b"+self.reString+r"\b"
    2577              try:
    2578                  self.re = re.compile( self.reString )
    2579              except:
    2580                  self.re = None
    2581
    2582 -    def parseImpl( self, instring, loc, doActions=True ):
    2583          if self.re:
    2584              result = self.re.match(instring,loc)
    2585              if not result:
    2586                  raise ParseException(instring, loc, self.errmsg, self)
    2587
    2588              loc = result.end()
    2589              return loc, result.group()
    2590
    2591          if not(instring[ loc ] in self.initChars):
    2592              raise ParseException(instring, loc, self.errmsg, self)
    2593
    2594          start = loc
    2595          loc += 1
    2596          instrlen = len(instring)
    2597          bodychars = self.bodyChars
    2598          maxloc = start + self.maxLen
    2599          maxloc = min( maxloc, instrlen )
    2600          while loc < maxloc and instring[loc] in bodychars:
    2601              loc += 1
    2602
    2603          throwException = False
    2604          if loc - start < self.minLen:
    2605              throwException = True
    2606          if self.maxSpecified and loc < instrlen and instring[loc] in bodychars:
    2607              throwException = True
    2608          if self.asKeyword:
    2609              if (start>0 and instring[start-1] in bodychars) or (loc<instrlen and instring[loc] in bodychars):
    2610                  throwException = True
    2611
    2612          if throwException:
    2613              raise ParseException(instring, loc, self.errmsg, self)
    2614
    2615          return loc, instring[start:loc]
    2616
    2617 -    def __str__( self ):
    2618          try:
    2619              return super(Word,self).__str__()
    2620          except:
    2621              pass
    2622
    2623
    2624          if self.strRepr is None:
    2625
    2626              def charsAsStr(s):
    2627                  if len(s)>4:
    2628                      return s[:4]+"..."
    2629                  else:
    2630                      return s
    2631
    2632              if ( self.initCharsOrig != self.bodyCharsOrig ):
    2633                  self.strRepr = "W:(%s,%s)" % ( charsAsStr(self.initCharsOrig), charsAsStr(self.bodyCharsOrig) )
    2634              else:
    2635                  self.strRepr = "W:(%s)" % charsAsStr(self.initCharsOrig)
    2636
    2637          return self.strRepr
    2638
    2639
    2640 -class Regex(Token):
    2641      """
    2642      Token for matching strings that match a given regular expression.
    2643      Defined with string specifying the regular expression in a form recognized by the inbuilt Python re module.
    2644      If the given regex contains named groups (defined using C{(?P<name>...)}), these will be preserved as
    2645      named parse results.
    2646
    2647      Example::
    2648          realnum = Regex(r"[+-]?\d+\.\d*")
    2649          date = Regex(r'(?P<year>\d{4})-(?P<month>\d\d)-(?P<day>\d\d)')
    2650          # ref: http://stackoverflow.com/questions/267399/how-do-you-match-only-valid-roman-numerals-with-a-regular-expression
    2651          roman = Regex(r"M{0,4}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})")
    2652      """
    2653      compiledREtype = type(re.compile("[A-Z]"))
    2654 -    def __init__( self, pattern, flags=0):
    2655          """The parameters C{pattern} and C{flags} are passed to the C{re.compile()} function as-is. See the Python C{re} module for an explanation of the acceptable patterns and flags."""
    2656          super(Regex,self).__init__()
    2657
    2658          if isinstance(pattern, basestring):
    2659              if not pattern:
    2660                  warnings.warn("null string passed to Regex; use Empty() instead",
    2661                          SyntaxWarning, stacklevel=2)
    2662
    2663              self.pattern = pattern
    2664              self.flags = flags
    2665
    2666              try:
    2667                  self.re = re.compile(self.pattern, self.flags)
    2668                  self.reString = self.pattern
    2669              except sre_constants.error:
    2670                  warnings.warn("invalid pattern (%s) passed to Regex" % pattern,
    2671                      SyntaxWarning, stacklevel=2)
    2672                  raise
    2673
    2674          elif isinstance(pattern, Regex.compiledREtype):
    2675              self.re = pattern
    2676              self.pattern = \
    2677              self.reString = str(pattern)
    2678              self.flags = flags
    2679
    2680          else:
    2681              raise ValueError("Regex may only be constructed with a string or a compiled RE object")
    2682
    2683          self.name = _ustr(self)
    2684          self.errmsg = "Expected " + self.name
    2685          self.mayIndexError = False
    2686          self.mayReturnEmpty = True
    2687
    2688 -    def parseImpl( self, instring, loc, doActions=True ):
    2689          result = self.re.match(instring,loc)
    2690          if not result:
    2691              raise ParseException(instring, loc, self.errmsg, self)
    2692
    2693          loc = result.end()
    2694          d = result.groupdict()
    2695          ret = ParseResults(result.group())
    2696          if d:
    2697              for k in d:
    2698                  ret[k] = d[k]
    2699          return loc,ret
    2700
    2701 -    def __str__( self ):
    2702          try:
    2703              return super(Regex,self).__str__()
    2704          except:
    2705              pass
    2706
    2707          if self.strRepr is None:
    2708              self.strRepr = "Re:(%s)" % repr(self.pattern)
    2709
    2710          return self.strRepr
    2711
    2712
    2713 -class QuotedString(Token):
    2714      r"""
    2715      Token for matching strings that are delimited by quoting characters.
    2716
    2717      Defined with the following parameters:
    2718          - quoteChar - string of one or more characters defining the quote delimiting string
    2719          - escChar - character to escape quotes, typically backslash (default=C{None})
    2720          - escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=C{None})
    2721          - multiline - boolean indicating whether quotes can span multiple lines (default=C{False})
    2722          - unquoteResults - boolean indicating whether the matched text should be unquoted (default=C{True})
    2723          - endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=C{None} => same as quoteChar)
    2724          - convertWhitespaceEscapes - convert escaped whitespace (C{'\t'}, C{'\n'}, etc.) to actual whitespace (default=C{True})
    2725
    2726      Example::
    2727          qs = QuotedString('"')
    2728          print(qs.searchString('lsjdf "This is the quote" sldjf'))
    2729          complex_qs = QuotedString('{{', endQuoteChar='}}')
    2730          print(complex_qs.searchString('lsjdf {{This is the "quote"}} sldjf'))
    2731          sql_qs = QuotedString('"', escQuote='""')
    2732          print(sql_qs.searchString('lsjdf "This is the quote with ""embedded"" quotes" sldjf'))
    2733      prints::
    2734          [['This is the quote']]
    2735          [['This is the "quote"']]
    2736          [['This is the quote with "embedded" quotes']]
    2737      """
    2738 -    def __init__( self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None, convertWhitespaceEscapes=True):
    2739          super(QuotedString,self).__init__()
    2740
    2741          # remove white space from quote chars - wont work anyway
    2742          quoteChar = quoteChar.strip()
    2743          if not quoteChar:
    2744              warnings.warn("quoteChar cannot be the empty string",SyntaxWarning,stacklevel=2)
    2745              raise SyntaxError()
    2746
    2747          if endQuoteChar is None:
    2748              endQuoteChar = quoteChar
    2749          else:
    2750              endQuoteChar = endQuoteChar.strip()
    2751              if not endQuoteChar:
    2752                  warnings.warn("endQuoteChar cannot be the empty string",SyntaxWarning,stacklevel=2)
    2753                  raise SyntaxError()
    2754
    2755          self.quoteChar = quoteChar
    2756          self.quoteCharLen = len(quoteChar)
    2757          self.firstQuoteChar = quoteChar[0]
    2758          self.endQuoteChar = endQuoteChar
    2759          self.endQuoteCharLen = len(endQuoteChar)
    2760          self.escChar = escChar
    2761          self.escQuote = escQuote
    2762          self.unquoteResults = unquoteResults
    2763          self.convertWhitespaceEscapes = convertWhitespaceEscapes
    2764
    2765          if multiline:
    2766              self.flags = re.MULTILINE | re.DOTALL
    2767              self.pattern = r'%s(?:[^%s%s]' % \
    2768                  ( re.escape(self.quoteChar),
    2769                    _escapeRegexRangeChars(self.endQuoteChar[0]),
    2770                    (escChar is not None and _escapeRegexRangeChars(escChar) or '') )
    2771          else:
    2772              self.flags = 0
    2773              self.pattern = r'%s(?:[^%s\n\r%s]' % \
    2774                  ( re.escape(self.quoteChar),
    2775                    _escapeRegexRangeChars(self.endQuoteChar[0]),
    2776                    (escChar is not None and _escapeRegexRangeChars(escChar) or '') )
    2777          if len(self.endQuoteChar) > 1:
    2778              self.pattern += (
    2779                  '|(?:' + ')|(?:'.join("%s[^%s]" % (re.escape(self.endQuoteChar[:i]),
    2780                                                 _escapeRegexRangeChars(self.endQuoteChar[i]))
    2781                                      for i in range(len(self.endQuoteChar)-1,0,-1)) + ')'
    2782                  )
    2783          if escQuote:
    2784              self.pattern += (r'|(?:%s)' % re.escape(escQuote))
    2785          if escChar:
    2786              self.pattern += (r'|(?:%s.)' % re.escape(escChar))
    2787              self.escCharReplacePattern = re.escape(self.escChar)+"(.)"
    2788          self.pattern += (r')*%s' % re.escape(self.endQuoteChar))
    2789
    2790          try:
    2791              self.re = re.compile(self.pattern, self.flags)
    2792              self.reString = self.pattern
    2793          except sre_constants.error:
    2794              warnings.warn("invalid pattern (%s) passed to Regex" % self.pattern,
    2795                  SyntaxWarning, stacklevel=2)
    2796              raise
    2797
    2798          self.name = _ustr(self)
    2799          self.errmsg = "Expected " + self.name
    2800          self.mayIndexError = False
    2801          self.mayReturnEmpty = True
    2802
    2803 -    def parseImpl( self, instring, loc, doActions=True ):
    2804          result = instring[loc] == self.firstQuoteChar and self.re.match(instring,loc) or None
    2805          if not result:
    2806              raise ParseException(instring, loc, self.errmsg, self)
    2807
    2808          loc = result.end()
    2809          ret = result.group()
    2810
    2811          if self.unquoteResults:
    2812
    2813              # strip off quotes
    2814              ret = ret[self.quoteCharLen:-self.endQuoteCharLen]
    2815
    2816              if isinstance(ret,basestring):
    2817                  # replace escaped whitespace
    2818                  if '\\' in ret and self.convertWhitespaceEscapes:
    2819                      ws_map = {
    2820                          r'\t' : '\t',
    2821                          r'\n' : '\n',
    2822                          r'\f' : '\f',
    2823                          r'\r' : '\r',
    2824                      }
    2825                      for wslit,wschar in ws_map.items():
    2826                          ret = ret.replace(wslit, wschar)
    2827
    2828                  # replace escaped characters
    2829                  if self.escChar:
    2830                      ret = re.sub(self.escCharReplacePattern,"\g<1>",ret)
    2831
    2832                  # replace escaped quotes
    2833                  if self.escQuote:
    2834                      ret = ret.replace(self.escQuote, self.endQuoteChar)
    2835
    2836          return loc, ret
    2837
    2838 -    def __str__( self ):
    2839          try:
    2840              return super(QuotedString,self).__str__()
    2841          except:
    2842              pass
    2843
    2844          if self.strRepr is None:
    2845              self.strRepr = "quoted string, starting with %s ending with %s" % (self.quoteChar, self.endQuoteChar)
    2846
    2847          return self.strRepr
    2848
    2849
    2850 -class CharsNotIn(Token):
    2851      """
    2852      Token for matching words composed of characters I{not} in a given set (will
    2853      include whitespace in matched characters if not listed in the provided exclusion set - see example).
    2854      Defined with string containing all disallowed characters, and an optional
    2855      minimum, maximum, and/or exact length.  The default value for C{min} is 1 (a
    2856      minimum value < 1 is not valid); the default values for C{max} and C{exact}
    2857      are 0, meaning no maximum or exact length restriction.
    2858
    2859      Example::
    2860          # define a comma-separated-value as anything that is not a ','
    2861          csv_value = CharsNotIn(',')
    2862          print(delimitedList(csv_value).parseString("dkls,lsdkjf,s12 34,@!#,213"))
    2863      prints::
    2864          ['dkls', 'lsdkjf', 's12 34', '@!#', '213']
    2865      """
    2866 -    def __init__( self, notChars, min=1, max=0, exact=0 ):
    2867          super(CharsNotIn,self).__init__()
    2868          self.skipWhitespace = False
    2869          self.notChars = notChars
    2870
    2871          if min < 1:
    2872              raise ValueError("cannot specify a minimum length < 1; use Optional(CharsNotIn()) if zero-length char group is permitted")
    2873
    2874          self.minLen = min
    2875
    2876          if max > 0:
    2877              self.maxLen = max
    2878          else:
    2879              self.maxLen = _MAX_INT
    2880
    2881          if exact > 0:
    2882              self.maxLen = exact
    2883              self.minLen = exact
    2884
    2885          self.name = _ustr(self)
    2886          self.errmsg = "Expected " + self.name
    2887          self.mayReturnEmpty = ( self.minLen == 0 )
    2888          self.mayIndexError = False
    2889
    2890 -    def parseImpl( self, instring, loc, doActions=True ):
    2891          if instring[loc] in self.notChars:
    2892              raise ParseException(instring, loc, self.errmsg, self)
    2893
    2894          start = loc
    2895          loc += 1
    2896          notchars = self.notChars
    2897          maxlen = min( start+self.maxLen, len(instring) )
    2898          while loc < maxlen and \
    2899                (instring[loc] not in notchars):
    2900              loc += 1
    2901
    2902          if loc - start < self.minLen:
    2903              raise ParseException(instring, loc, self.errmsg, self)
    2904
    2905          return loc, instring[start:loc]
    2906
    2907 -    def __str__( self ):
    2908          try:
    2909              return super(CharsNotIn, self).__str__()
    2910          except:
    2911              pass
    2912
    2913          if self.strRepr is None:
    2914              if len(self.notChars) > 4:
    2915                  self.strRepr = "!W:(%s...)" % self.notChars[:4]
    2916              else:
    2917                  self.strRepr = "!W:(%s)" % self.notChars
    2918
    2919          return self.strRepr
    2920
    2921 -class White(Token):
    2922      """
    2923      Special matching class for matching whitespace.  Normally, whitespace is ignored
    2924      by pyparsing grammars.  This class is included when some whitespace structures
    2925      are significant.  Define with a string containing the whitespace characters to be
    2926      matched; default is C{" \\t\\r\\n"}.  Also takes optional C{min}, C{max}, and C{exact} arguments,
    2927      as defined for the C{L{Word}} class.
    2928      """
    2929      whiteStrs = {
    2930          " " : "<SPC>",
    2931          "\t": "<TAB>",
    2932          "\n": "<LF>",
    2933          "\r": "<CR>",
    2934          "\f": "<FF>",
    2935          }
    2936 -    def __init__(self, ws=" \t\r\n", min=1, max=0, exact=0):
    2937          super(White,self).__init__()
    2938          self.matchWhite = ws
    2939          self.setWhitespaceChars( "".join(c for c in self.whiteChars if c not in self.matchWhite) )
    2940          #~ self.leaveWhitespace()
    2941          self.name = ("".join(White.whiteStrs[c] for c in self.matchWhite))
    2942          self.mayReturnEmpty = True
    2943          self.errmsg = "Expected " + self.name
    2944
    2945          self.minLen = min
    2946
    2947          if max > 0:
    2948              self.maxLen = max
    2949          else:
    2950              self.maxLen = _MAX_INT
    2951
    2952          if exact > 0:
    2953              self.maxLen = exact
    2954              self.minLen = exact
    2955
    2956 -    def parseImpl( self, instring, loc, doActions=True ):
    2957          if not(instring[ loc ] in self.matchWhite):
    2958              raise ParseException(instring, loc, self.errmsg, self)
    2959          start = loc
    2960          loc += 1
    2961          maxloc = start + self.maxLen
    2962          maxloc = min( maxloc, len(instring) )
    2963          while loc < maxloc and instring[loc] in self.matchWhite:
    2964              loc += 1
    2965
    2966          if loc - start < self.minLen:
    2967              raise ParseException(instring, loc, self.errmsg, self)
    2968
    2969          return loc, instring[start:loc]
    2970
    2971
    2972 -class _PositionToken(Token):
    2973 -    def __init__( self ):
    2974          super(_PositionToken,self).__init__()
    2975          self.name=self.__class__.__name__
    2976          self.mayReturnEmpty = True
    2977          self.mayIndexError = False
    2978
    2979 -class GoToColumn(_PositionToken):
    2980      """
    2981      Token to advance to a specific column of input text; useful for tabular report scraping.
    2982      """
    2983 -    def __init__( self, colno ):
    2984          super(GoToColumn,self).__init__()
    2985          self.col = colno
    2986
    2987 -    def preParse( self, instring, loc ):
    2988          if col(loc,instring) != self.col:
    2989              instrlen = len(instring)
    2990              if self.ignoreExprs:
    2991                  loc = self._skipIgnorables( instring, loc )
    2992              while loc < instrlen and instring[loc].isspace() and col( loc, instring ) != self.col :
    2993                  loc += 1
    2994          return loc
    2995
    2996 -    def parseImpl( self, instring, loc, doActions=True ):
    2997          thiscol = col( loc, instring )
    2998          if thiscol > self.col:
    2999              raise ParseException( instring, loc, "Text not in expected column", self )
    3000          newloc = loc + self.col - thiscol
    3001          ret = instring[ loc: newloc ]
    3002          return newloc, ret
    3003
    3004 -class LineStart(_PositionToken):
    3005      """
    3006      Matches if current position is at the beginning of a line within the parse string
    3007      """
    3008 -    def __init__( self ):
    3009          super(LineStart,self).__init__()
    3010          self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") )
    3011          self.errmsg = "Expected start of line"
    3012
    3013 -    def preParse( self, instring, loc ):
    3014          preloc = super(LineStart,self).preParse(instring,loc)
    3015          if instring[preloc] == "\n":
    3016              loc += 1
    3017          return loc
    3018
    3019 -    def parseImpl( self, instring, loc, doActions=True ):
    3020          if not( loc==0 or
    3021              (loc == self.preParse( instring, 0 )) or
    3022              (instring[loc-1] == "\n") ): #col(loc, instring) != 1:
    3023              raise ParseException(instring, loc, self.errmsg, self)
    3024          return loc, []
    3025
    3026 -class LineEnd(_PositionToken):
    3027      """
    3028      Matches if current position is at the end of a line within the parse string
    3029      """
    3030 -    def __init__( self ):
    3031          super(LineEnd,self).__init__()
    3032          self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") )
    3033          self.errmsg = "Expected end of line"
    3034
    3035 -    def parseImpl( self, instring, loc, doActions=True ):
    3036          if loc<len(instring):
    3037              if instring[loc] == "\n":
    3038                  return loc+1, "\n"
    3039              else:
    3040                  raise ParseException(instring, loc, self.errmsg, self)
    3041          elif loc == len(instring):
    3042              return loc+1, []
    3043          else:
    3044              raise ParseException(instring, loc, self.errmsg, self)
    3045
    3046 -class StringStart(_PositionToken):
    3047      """
    3048      Matches if current position is at the beginning of the parse string
    3049      """
    3050 -    def __init__( self ):
    3051          super(StringStart,self).__init__()
    3052          self.errmsg = "Expected start of text"
    3053
    3054 -    def parseImpl( self, instring, loc, doActions=True ):
    3055          if loc != 0:
    3056              # see if entire string up to here is just whitespace and ignoreables
    3057              if loc != self.preParse( instring, 0 ):
    3058                  raise ParseException(instring, loc, self.errmsg, self)
    3059          return loc, []
    3060
    3061 -class StringEnd(_PositionToken):
    3062      """
    3063      Matches if current position is at the end of the parse string
    3064      """
    3065 -    def __init__( self ):
    3066          super(StringEnd,self).__init__()
    3067          self.errmsg = "Expected end of text"
    3068
    3069 -    def parseImpl( self, instring, loc, doActions=True ):
    3070          if loc < len(instring):
    3071              raise ParseException(instring, loc, self.errmsg, self)
    3072          elif loc == len(instring):
    3073              return loc+1, []
    3074          elif loc > len(instring):
    3075              return loc, []
    3076          else:
    3077              raise ParseException(instring, loc, self.errmsg, self)
    3078
    3079 -class WordStart(_PositionToken):
    3080      """
    3081      Matches if the current position is at the beginning of a Word, and
    3082      is not preceded by any character in a given set of C{wordChars}
    3083      (default=C{printables}). To emulate the C{\b} behavior of regular expressions,
    3084      use C{WordStart(alphanums)}. C{WordStart} will also match at the beginning of
    3085      the string being parsed, or at the beginning of a line.
    3086      """
    3087 -    def __init__(self, wordChars = printables):
    3088          super(WordStart,self).__init__()
    3089          self.wordChars = set(wordChars)
    3090          self.errmsg = "Not at the start of a word"
    3091
    3092 -    def parseImpl(self, instring, loc, doActions=True ):
    3093          if loc != 0:
    3094              if (instring[loc-1] in self.wordChars or
    3095                  instring[loc] not in self.wordChars):
    3096                  raise ParseException(instring, loc, self.errmsg, self)
    3097          return loc, []
    3098
    3099 -class WordEnd(_PositionToken):
    3100      """
    3101      Matches if the current position is at the end of a Word, and
    3102      is not followed by any character in a given set of C{wordChars}
    3103      (default=C{printables}). To emulate the C{\b} behavior of regular expressions,
    3104      use C{WordEnd(alphanums)}. C{WordEnd} will also match at the end of
    3105      the string being parsed, or at the end of a line.
    3106      """
    3107 -    def __init__(self, wordChars = printables):
    3108          super(WordEnd,self).__init__()
    3109          self.wordChars = set(wordChars)
    3110          self.skipWhitespace = False
    3111          self.errmsg = "Not at the end of a word"
    3112
    3113 -    def parseImpl(self, instring, loc, doActions=True ):
    3114          instrlen = len(instring)
    3115          if instrlen>0 and loc<instrlen:
    3116              if (instring[loc] in self.wordChars or
    3117                  instring[loc-1] not in self.wordChars):
    3118                  raise ParseException(instring, loc, self.errmsg, self)
    3119          return loc, []
    3120
    3121
    3122 -class ParseExpression(ParserElement):
    3123      """
    3124      Abstract subclass of ParserElement, for combining and post-processing parsed tokens.
    3125      """
    3126 -    def __init__( self, exprs, savelist = False ):
    3127          super(ParseExpression,self).__init__(savelist)
    3128          if isinstance( exprs, _generatorType ):
    3129              exprs = list(exprs)
    3130
    3131          if isinstance( exprs, basestring ):
    3132              self.exprs = [ ParserElement._literalStringClass( exprs ) ]
    3133          elif isinstance( exprs, collections.Iterable ):
    3134              exprs = list(exprs)
    3135              # if sequence of strings provided, wrap with Literal
    3136              if all(isinstance(expr, basestring) for expr in exprs):
    3137                  exprs = map(ParserElement._literalStringClass, exprs)
    3138              self.exprs = list(exprs)
    3139          else:
    3140              try:
    3141                  self.exprs = list( exprs )
    3142              except TypeError:
    3143                  self.exprs = [ exprs ]
    3144          self.callPreparse = False
    3145
    3146 -    def __getitem__( self, i ):
    3147          return self.exprs[i]
    3148
    3149 -    def append( self, other ):
    3150          self.exprs.append( other )
    3151          self.strRepr = None
    3152          return self
    3153
    3154 -    def leaveWhitespace( self ):
    3155          """Extends C{leaveWhitespace} defined in base class, and also invokes C{leaveWhitespace} on
    3156             all contained expressions."""
    3157          self.skipWhitespace = False
    3158          self.exprs = [ e.copy() for e in self.exprs ]
    3159          for e in self.exprs:
    3160              e.leaveWhitespace()
    3161          return self
    3162
    3163 -    def ignore( self, other ):
    3164          if isinstance( other, Suppress ):
    3165              if other not in self.ignoreExprs:
    3166                  super( ParseExpression, self).ignore( other )
    3167                  for e in self.exprs:
    3168                      e.ignore( self.ignoreExprs[-1] )
    3169          else:
    3170              super( ParseExpression, self).ignore( other )
    3171              for e in self.exprs:
    3172                  e.ignore( self.ignoreExprs[-1] )
    3173          return self
    3174
    3175 -    def __str__( self ):
    3176          try:
    3177              return super(ParseExpression,self).__str__()
    3178          except:
    3179              pass
    3180
    3181          if self.strRepr is None:
    3182              self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.exprs) )
    3183          return self.strRepr
    3184
    3185 -    def streamline( self ):
    3186          super(ParseExpression,self).streamline()
    3187
    3188          for e in self.exprs:
    3189              e.streamline()
    3190
    3191          # collapse nested And's of the form And( And( And( a,b), c), d) to And( a,b,c,d )
    3192          # but only if there are no parse actions or resultsNames on the nested And's
    3193          # (likewise for Or's and MatchFirst's)
    3194          if ( len(self.exprs) == 2 ):
    3195              other = self.exprs[0]
    3196              if ( isinstance( other, self.__class__ ) and
    3197                    not(other.parseAction) and
    3198                    other.resultsName is None and
    3199                    not other.debug ):
    3200                  self.exprs = other.exprs[:] + [ self.exprs[1] ]
    3201                  self.strRepr = None
    3202                  self.mayReturnEmpty |= other.mayReturnEmpty
    3203                  self.mayIndexError  |= other.mayIndexError
    3204
    3205              other = self.exprs[-1]
    3206              if ( isinstance( other, self.__class__ ) and
    3207                    not(other.parseAction) and
    3208                    other.resultsName is None and
    3209                    not other.debug ):
    3210                  self.exprs = self.exprs[:-1] + other.exprs[:]
    3211                  self.strRepr = None
    3212                  self.mayReturnEmpty |= other.mayReturnEmpty
    3213                  self.mayIndexError  |= other.mayIndexError
    3214
    3215          self.errmsg = "Expected " + _ustr(self)
    3216
    3217          return self
    3218
    3219 -    def setResultsName( self, name, listAllMatches=False ):
    3220          ret = super(ParseExpression,self).setResultsName(name,listAllMatches)
    3221          return ret
    3222
    3223 -    def validate( self, validateTrace=[] ):
    3224          tmp = validateTrace[:]+[self]
    3225          for e in self.exprs:
    3226              e.validate(tmp)
    3227          self.checkRecursion( [] )
    3228
    3229 -    def copy(self):
    3230          ret = super(ParseExpression,self).copy()
    3231          ret.exprs = [e.copy() for e in self.exprs]
    3232          return ret
    3233
    3234 -class And(ParseExpression):
    3235      """
    3236      Requires all given C{ParseExpression}s to be found in the given order.
    3237      Expressions may be separated by whitespace.
    3238      May be constructed using the C{'+'} operator.
    3239      May also be constructed using the C{'-'} operator, which will suppress backtracking.
    3240
    3241      Example::
    3242          integer = Word(nums)
    3243          name_expr = OneOrMore(Word(alphas))
    3244
    3245          expr = And([integer("id"),name_expr("name"),integer("age")])
    3246          # more easily written as:
    3247          expr = integer("id") + name_expr("name") + integer("age")
    3248      """
    3249
    3250 -    class _ErrorStop(Empty):
    3251 -        def __init__(self, *args, **kwargs):
    3252              super(And._ErrorStop,self).__init__(*args, **kwargs)
    3253              self.name = '-'
    3254              self.leaveWhitespace()
    3255
    3256 -    def __init__( self, exprs, savelist = True ):
    3257          super(And,self).__init__(exprs, savelist)
    3258          self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs)
    3259          self.setWhitespaceChars( self.exprs[0].whiteChars )
    3260          self.skipWhitespace = self.exprs[0].skipWhitespace
    3261          self.callPreparse = True
    3262
    3263 -    def parseImpl( self, instring, loc, doActions=True ):
    3264          # pass False as last arg to _parse for first element, since we already
    3265          # pre-parsed the string as part of our And pre-parsing
    3266          loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False )
    3267          errorStop = False
    3268          for e in self.exprs[1:]:
    3269              if isinstance(e, And._ErrorStop):
    3270                  errorStop = True
    3271                  continue
    3272              if errorStop:
    3273                  try:
    3274                      loc, exprtokens = e._parse( instring, loc, doActions )
    3275                  except ParseSyntaxException:
    3276                      raise
    3277                  except ParseBaseException as pe:
    3278                      pe.__traceback__ = None
    3279                      raise ParseSyntaxException._from_exception(pe)
    3280                  except IndexError:
    3281                      raise ParseSyntaxException(instring, len(instring), self.errmsg, self)
    3282              else:
    3283                  loc, exprtokens = e._parse( instring, loc, doActions )
    3284              if exprtokens or exprtokens.haskeys():
    3285                  resultlist += exprtokens
    3286          return loc, resultlist
    3287
    3288 -    def __iadd__(self, other ):
    3289          if isinstance( other, basestring ):
    3290              other = ParserElement._literalStringClass( other )
    3291          return self.append( other ) #And( [ self, other ] )
    3292
    3293 -    def checkRecursion( self, parseElementList ):
    3294          subRecCheckList = parseElementList[:] + [ self ]
    3295          for e in self.exprs:
    3296              e.checkRecursion( subRecCheckList )
    3297              if not e.mayReturnEmpty:
    3298                  break
    3299
    3300 -    def __str__( self ):
    3301          if hasattr(self,"name"):
    3302              return self.name
    3303
    3304          if self.strRepr is None:
    3305              self.strRepr = "{" + " ".join(_ustr(e) for e in self.exprs) + "}"
    3306
    3307          return self.strRepr
    3308
    3309
    3310 -class Or(ParseExpression):
    3311      """
    3312      Requires that at least one C{ParseExpression} is found.
    3313      If two expressions match, the expression that matches the longest string will be used.
    3314      May be constructed using the C{'^'} operator.
    3315
    3316      Example::
    3317          # construct Or using '^' operator
    3318
    3319          number = Word(nums) ^ Combine(Word(nums) + '.' + Word(nums))
    3320          print(number.searchString("123 3.1416 789"))
    3321      prints::
    3322          [['123'], ['3.1416'], ['789']]
    3323      """
    3324 -    def __init__( self, exprs, savelist = False ):
    3325          super(Or,self).__init__(exprs, savelist)
    3326          if self.exprs:
    3327              self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs)
    3328          else:
    3329              self.mayReturnEmpty = True
    3330
    3331 -    def parseImpl( self, instring, loc, doActions=True ):
    3332          maxExcLoc = -1
    3333          maxException = None
    3334          matches = []
    3335          for e in self.exprs:
    3336              try:
    3337                  loc2 = e.tryParse( instring, loc )
    3338              except ParseException as err:
    3339                  err.__traceback__ = None
    3340                  if err.loc > maxExcLoc:
    3341                      maxException = err
    3342                      maxExcLoc = err.loc
    3343              except IndexError:
    3344                  if len(instring) > maxExcLoc:
    3345                      maxException = ParseException(instring,len(instring),e.errmsg,self)
    3346                      maxExcLoc = len(instring)
    3347              else:
    3348                  # save match among all matches, to retry longest to shortest
    3349                  matches.append((loc2, e))
    3350
    3351          if matches:
    3352              matches.sort(key=lambda x: -x[0])
    3353              for _,e in matches:
    3354                  try:
    3355                      return e._parse( instring, loc, doActions )
    3356                  except ParseException as err:
    3357                      err.__traceback__ = None
    3358                      if err.loc > maxExcLoc:
    3359                          maxException = err
    3360                          maxExcLoc = err.loc
    3361
    3362          if maxException is not None:
    3363              maxException.msg = self.errmsg
    3364              raise maxException
    3365          else:
    3366              raise ParseException(instring, loc, "no defined alternatives to match", self)
    3367
    3368
    3369 -    def __ixor__(self, other ):
    3370          if isinstance( other, basestring ):
    3371              other = ParserElement._literalStringClass( other )
    3372          return self.append( other ) #Or( [ self, other ] )
    3373
    3374 -    def __str__( self ):
    3375          if hasattr(self,"name"):
    3376              return self.name
    3377
    3378          if self.strRepr is None:
    3379              self.strRepr = "{" + " ^ ".join(_ustr(e) for e in self.exprs) + "}"
    3380
    3381          return self.strRepr
    3382
    3383 -    def checkRecursion( self, parseElementList ):
    3384          subRecCheckList = parseElementList[:] + [ self ]
    3385          for e in self.exprs:
    3386              e.checkRecursion( subRecCheckList )
    3387
    3388
    3389 -class MatchFirst(ParseExpression):
    3390      """
    3391      Requires that at least one C{ParseExpression} is found.
    3392      If two expressions match, the first one listed is the one that will match.
    3393      May be constructed using the C{'|'} operator.
    3394
    3395      Example::
    3396          # construct MatchFirst using '|' operator
    3397
    3398          # watch the order of expressions to match
    3399          number = Word(nums) | Combine(Word(nums) + '.' + Word(nums))
    3400          print(number.searchString("123 3.1416 789")) #  Fail! -> [['123'], ['3'], ['1416'], ['789']]
    3401
    3402          # put more selective expression first
    3403          number = Combine(Word(nums) + '.' + Word(nums)) | Word(nums)
    3404          print(number.searchString("123 3.1416 789")) #  Better -> [['123'], ['3.1416'], ['789']]
    3405      """
    3406 -    def __init__( self, exprs, savelist = False ):
    3407          super(MatchFirst,self).__init__(exprs, savelist)
    3408          if self.exprs:
    3409              self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs)
    3410          else:
    3411              self.mayReturnEmpty = True
    3412
    3413 -    def parseImpl( self, instring, loc, doActions=True ):
    3414          maxExcLoc = -1
    3415          maxException = None
    3416          for e in self.exprs:
    3417              try:
    3418                  ret = e._parse( instring, loc, doActions )
    3419                  return ret
    3420              except ParseException as err:
    3421                  if err.loc > maxExcLoc:
    3422                      maxException = err
    3423                      maxExcLoc = err.loc
    3424              except IndexError:
    3425                  if len(instring) > maxExcLoc:
    3426                      maxException = ParseException(instring,len(instring),e.errmsg,self)
    3427                      maxExcLoc = len(instring)
    3428
    3429          # only got here if no expression matched, raise exception for match that made it the furthest
    3430          else:
    3431              if maxException is not None:
    3432                  maxException.msg = self.errmsg
    3433                  raise maxException
    3434              else:
    3435                  raise ParseException(instring, loc, "no defined alternatives to match", self)
    3436
    3437 -    def __ior__(self, other ):
    3438          if isinstance( other, basestring ):
    3439              other = ParserElement._literalStringClass( other )
    3440          return self.append( other ) #MatchFirst( [ self, other ] )
    3441
    3442 -    def __str__( self ):
    3443          if hasattr(self,"name"):
    3444              return self.name
    3445
    3446          if self.strRepr is None:
    3447              self.strRepr = "{" + " | ".join(_ustr(e) for e in self.exprs) + "}"
    3448
    3449          return self.strRepr
    3450
    3451 -    def checkRecursion( self, parseElementList ):
    3452          subRecCheckList = parseElementList[:] + [ self ]
    3453          for e in self.exprs:
    3454              e.checkRecursion( subRecCheckList )
    3455
    3456
    3457 -class Each(ParseExpression):
    3458      """
    3459      Requires all given C{ParseExpression}s to be found, but in any order.
    3460      Expressions may be separated by whitespace.
    3461      May be constructed using the C{'&'} operator.
    3462
    3463      Example::
    3464          color = oneOf("RED ORANGE YELLOW GREEN BLUE PURPLE BLACK WHITE BROWN")
    3465          shape_type = oneOf("SQUARE CIRCLE TRIANGLE STAR HEXAGON OCTAGON")
    3466          integer = Word(nums)
    3467          shape_attr = "shape:" + shape_type("shape")
    3468          posn_attr = "posn:" + Group(integer("x") + ',' + integer("y"))("posn")
    3469          color_attr = "color:" + color("color")
    3470          size_attr = "size:" + integer("size")
    3471
    3472          # use Each (using operator '&') to accept attributes in any order
    3473          # (shape and posn are required, color and size are optional)
    3474          shape_spec = shape_attr & posn_attr & Optional(color_attr) & Optional(size_attr)
    3475
    3476          shape_spec.runTests('''
    3477              shape: SQUARE color: BLACK posn: 100, 120
    3478              shape: CIRCLE size: 50 color: BLUE posn: 50,80
    3479              color:GREEN size:20 shape:TRIANGLE posn:20,40
    3480              '''
    3481              )
    3482      prints::
    3483          shape: SQUARE color: BLACK posn: 100, 120
    3484          ['shape:', 'SQUARE', 'color:', 'BLACK', 'posn:', ['100', ',', '120']]
    3485          - color: BLACK
    3486          - posn: ['100', ',', '120']
    3487            - x: 100
    3488            - y: 120
    3489          - shape: SQUARE
    3490
    3491
    3492          shape: CIRCLE size: 50 color: BLUE posn: 50,80
    3493          ['shape:', 'CIRCLE', 'size:', '50', 'color:', 'BLUE', 'posn:', ['50', ',', '80']]
    3494          - color: BLUE
    3495          - posn: ['50', ',', '80']
    3496            - x: 50
    3497            - y: 80
    3498          - shape: CIRCLE
    3499          - size: 50
    3500
    3501
    3502          color: GREEN size: 20 shape: TRIANGLE posn: 20,40
    3503          ['color:', 'GREEN', 'size:', '20', 'shape:', 'TRIANGLE', 'posn:', ['20', ',', '40']]
    3504          - color: GREEN
    3505          - posn: ['20', ',', '40']
    3506            - x: 20
    3507            - y: 40
    3508          - shape: TRIANGLE
    3509          - size: 20
    3510      """
    3511 -    def __init__( self, exprs, savelist = True ):
    3512          super(Each,self).__init__(exprs, savelist)
    3513          self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs)
    3514          self.skipWhitespace = True
    3515          self.initExprGroups = True
    3516
    3517 -    def parseImpl( self, instring, loc, doActions=True ):
    3518          if self.initExprGroups:
    3519              self.opt1map = dict((id(e.expr),e) for e in self.exprs if isinstance(e,Optional))
    3520              opt1 = [ e.expr for e in self.exprs if isinstance(e,Optional) ]
    3521              opt2 = [ e for e in self.exprs if e.mayReturnEmpty and not isinstance(e,Optional)]
    3522              self.optionals = opt1 + opt2
    3523              self.multioptionals = [ e.expr for e in self.exprs if isinstance(e,ZeroOrMore) ]
    3524              self.multirequired = [ e.expr for e in self.exprs if isinstance(e,OneOrMore) ]
    3525              self.required = [ e for e in self.exprs if not isinstance(e,(Optional,ZeroOrMore,OneOrMore)) ]
    3526              self.required += self.multirequired
    3527              self.initExprGroups = False
    3528          tmpLoc = loc
    3529          tmpReqd = self.required[:]
    3530          tmpOpt  = self.optionals[:]
    3531          matchOrder = []
    3532
    3533          keepMatching = True
    3534          while keepMatching:
    3535              tmpExprs = tmpReqd + tmpOpt + self.multioptionals + self.multirequired
    3536              failed = []
    3537              for e in tmpExprs:
    3538                  try:
    3539                      tmpLoc = e.tryParse( instring, tmpLoc )
    3540                  except ParseException:
    3541                      failed.append(e)
    3542                  else:
    3543                      matchOrder.append(self.opt1map.get(id(e),e))
    3544                      if e in tmpReqd:
    3545                          tmpReqd.remove(e)
    3546                      elif e in tmpOpt:
    3547                          tmpOpt.remove(e)
    3548              if len(failed) == len(tmpExprs):
    3549                  keepMatching = False
    3550
    3551          if tmpReqd:
    3552              missing = ", ".join(_ustr(e) for e in tmpReqd)
    3553              raise ParseException(instring,loc,"Missing one or more required elements (%s)" % missing )
    3554
    3555          # add any unmatched Optionals, in case they have default values defined
    3556          matchOrder += [e for e in self.exprs if isinstance(e,Optional) and e.expr in tmpOpt]
    3557
    3558          resultlist = []
    3559          for e in matchOrder:
    3560              loc,results = e._parse(instring,loc,doActions)
    3561              resultlist.append(results)
    3562
    3563          finalResults = sum(resultlist, ParseResults([]))
    3564          return loc, finalResults
    3565
    3566 -    def __str__( self ):
    3567          if hasattr(self,"name"):
    3568              return self.name
    3569
    3570          if self.strRepr is None:
    3571              self.strRepr = "{" + " & ".join(_ustr(e) for e in self.exprs) + "}"
    3572
    3573          return self.strRepr
    3574
    3575 -    def checkRecursion( self, parseElementList ):
    3576          subRecCheckList = parseElementList[:] + [ self ]
    3577          for e in self.exprs:
    3578              e.checkRecursion( subRecCheckList )
    3579
    3580
    3581 -class ParseElementEnhance(ParserElement):
    3582      """
    3583      Abstract subclass of C{ParserElement}, for combining and post-processing parsed tokens.
    3584      """
    3585 -    def __init__( self, expr, savelist=False ):
    3586          super(ParseElementEnhance,self).__init__(savelist)
    3587          if isinstance( expr, basestring ):
    3588              if issubclass(ParserElement._literalStringClass, Token):
    3589                  expr = ParserElement._literalStringClass(expr)
    3590              else:
    3591                  expr = ParserElement._literalStringClass(Literal(expr))
    3592          self.expr = expr
    3593          self.strRepr = None
    3594          if expr is not None:
    3595              self.mayIndexError = expr.mayIndexError
    3596              self.mayReturnEmpty = expr.mayReturnEmpty
    3597              self.setWhitespaceChars( expr.whiteChars )
    3598              self.skipWhitespace = expr.skipWhitespace
    3599              self.saveAsList = expr.saveAsList
    3600              self.callPreparse = expr.callPreparse
    3601              self.ignoreExprs.extend(expr.ignoreExprs)
    3602
    3603 -    def parseImpl( self, instring, loc, doActions=True ):
    3604          if self.expr is not None:
    3605              return self.expr._parse( instring, loc, doActions, callPreParse=False )
    3606          else:
    3607              raise ParseException("",loc,self.errmsg,self)
    3608
    3609 -    def leaveWhitespace( self ):
    3610          self.skipWhitespace = False
    3611          self.expr = self.expr.copy()
    3612          if self.expr is not None:
    3613              self.expr.leaveWhitespace()
    3614          return self
    3615
    3616 -    def ignore( self, other ):
    3617          if isinstance( other, Suppress ):
    3618              if other not in self.ignoreExprs:
    3619                  super( ParseElementEnhance, self).ignore( other )
    3620                  if self.expr is not None:
    3621                      self.expr.ignore( self.ignoreExprs[-1] )
    3622          else:
    3623              super( ParseElementEnhance, self).ignore( other )
    3624              if self.expr is not None:
    3625                  self.expr.ignore( self.ignoreExprs[-1] )
    3626          return self
    3627
    3628 -    def streamline( self ):
    3629          super(ParseElementEnhance,self).streamline()
    3630          if self.expr is not None:
    3631              self.expr.streamline()
    3632          return self
    3633
    3634 -    def checkRecursion( self, parseElementList ):
    3635          if self in parseElementList:
    3636              raise RecursiveGrammarException( parseElementList+[self] )
    3637          subRecCheckList = parseElementList[:] + [ self ]
    3638          if self.expr is not None:
    3639              self.expr.checkRecursion( subRecCheckList )
    3640
    3641 -    def validate( self, validateTrace=[] ):
    3642          tmp = validateTrace[:]+[self]
    3643          if self.expr is not None:
    3644              self.expr.validate(tmp)
    3645          self.checkRecursion( [] )
    3646
    3647 -    def __str__( self ):
    3648          try:
    3649              return super(ParseElementEnhance,self).__str__()
    3650          except:
    3651              pass
    3652
    3653          if self.strRepr is None and self.expr is not None:
    3654              self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.expr) )
    3655          return self.strRepr
    3656
    3657
    3658 -class FollowedBy(ParseElementEnhance):
    3659      """
    3660      Lookahead matching of the given parse expression.  C{FollowedBy}
    3661      does I{not} advance the parsing position within the input string, it only
    3662      verifies that the specified parse expression matches at the current
    3663      position.  C{FollowedBy} always returns a null token list.
    3664
    3665      Example::
    3666          # use FollowedBy to match a label only if it is followed by a ':'
    3667          data_word = Word(alphas)
    3668          label = data_word + FollowedBy(':')
    3669          attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))
    3670
    3671          OneOrMore(attr_expr).parseString("shape: SQUARE color: BLACK posn: upper left").pprint()
    3672      prints::
    3673          [['shape', 'SQUARE'], ['color', 'BLACK'], ['posn', 'upper left']]
    3674      """
    3675 -    def __init__( self, expr ):
    3676          super(FollowedBy,self).__init__(expr)
    3677          self.mayReturnEmpty = True
    3678
    3679 -    def parseImpl( self, instring, loc, doActions=True ):
    3680          self.expr.tryParse( instring, loc )
    3681          return loc, []
    3682
    3683
    3684 -class NotAny(ParseElementEnhance):
    3685      """
    3686      Lookahead to disallow matching with the given parse expression.  C{NotAny}
    3687      does I{not} advance the parsing position within the input string, it only
    3688      verifies that the specified parse expression does I{not} match at the current
    3689      position.  Also, C{NotAny} does I{not} skip over leading whitespace. C{NotAny}
    3690      always returns a null token list.  May be constructed using the '~' operator.
    3691
    3692      Example::
    3693
    3694      """
    3695 -    def __init__( self, expr ):
    3696          super(NotAny,self).__init__(expr)
    3697          #~ self.leaveWhitespace()
    3698          self.skipWhitespace = False  # do NOT use self.leaveWhitespace(), don't want to propagate to exprs
    3699          self.mayReturnEmpty = True
    3700          self.errmsg = "Found unwanted token, "+_ustr(self.expr)
    3701
    3702 -    def parseImpl( self, instring, loc, doActions=True ):
    3703          if self.expr.canParseNext(instring, loc):
    3704              raise ParseException(instring, loc, self.errmsg, self)
    3705          return loc, []
    3706
    3707 -    def __str__( self ):
    3708          if hasattr(self,"name"):
    3709              return self.name
    3710
    3711          if self.strRepr is None:
    3712              self.strRepr = "~{" + _ustr(self.expr) + "}"
    3713
    3714          return self.strRepr
    3715
    3716 -class _MultipleMatch(ParseElementEnhance):
    3717 -    def __init__( self, expr, stopOn=None):
    3718          super(_MultipleMatch, self).__init__(expr)
    3719          ender = stopOn
    3720          if isinstance(ender, basestring):
    3721              ender = ParserElement._literalStringClass(ender)
    3722          self.not_ender = ~ender if ender is not None else None
    3723
    3724 -    def parseImpl( self, instring, loc, doActions=True ):
    3725          self_expr_parse = self.expr._parse
    3726          self_skip_ignorables = self._skipIgnorables
    3727          check_ender = self.not_ender is not None
    3728          if check_ender:
    3729              try_not_ender = self.not_ender.tryParse
    3730
    3731          # must be at least one (but first see if we are the stopOn sentinel;
    3732          # if so, fail)
    3733          if check_ender:
    3734              try_not_ender(instring, loc)
    3735          loc, tokens = self_expr_parse( instring, loc, doActions, callPreParse=False )
    3736          try:
    3737              hasIgnoreExprs = (not not self.ignoreExprs)
    3738              while 1:
    3739                  if check_ender:
    3740                      try_not_ender(instring, loc)
    3741                  if hasIgnoreExprs:
    3742                      preloc = self_skip_ignorables( instring, loc )
    3743                  else:
    3744                      preloc = loc
    3745                  loc, tmptokens = self_expr_parse( instring, preloc, doActions )
    3746                  if tmptokens or tmptokens.haskeys():
    3747                      tokens += tmptokens
    3748          except (ParseException,IndexError):
    3749              pass
    3750
    3751          return loc, tokens
    3752
    3753 -class OneOrMore(_MultipleMatch):
    3754      """
    3755      Repetition of one or more of the given expression.
    3756
    3757      Parameters:
    3758       - expr - expression that must match one or more times
    3759       - stopOn - (default=C{None}) - expression for a terminating sentinel
    3760            (only required if the sentinel would ordinarily match the repetition
    3761            expression)
    3762
    3763      Example::
    3764          data_word = Word(alphas)
    3765          label = data_word + FollowedBy(':')
    3766          attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).setParseAction(' '.join))
    3767
    3768          text = "shape: SQUARE posn: upper left color: BLACK"
    3769          OneOrMore(attr_expr).parseString(text).pprint()  # Fail! read 'color' as data instead of next label -> [['shape', 'SQUARE color']]
    3770
    3771          # use stopOn attribute for OneOrMore to avoid reading label string as part of the data
    3772          attr_expr = Group(label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))
    3773          OneOrMore(attr_expr).parseString(text).pprint() # Better -> [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'BLACK']]
    3774
    3775          # could also be written as
    3776          (attr_expr * (1,)).parseString(text).pprint()
    3777      """
    3778
    3779 -    def __str__( self ):
    3780          if hasattr(self,"name"):
    3781              return self.name
    3782
    3783          if self.strRepr is None:
    3784              self.strRepr = "{" + _ustr(self.expr) + "}..."
    3785
    3786          return self.strRepr
    3787
    3788 -    def setResultsName( self, name, listAllMatches=False ):
    3789          ret = super(OneOrMore,self).setResultsName(name,listAllMatches)
    3790          ret.saveAsList = True
    3791          return ret
    3792
    3793 -class ZeroOrMore(_MultipleMatch):
    3794      """
    3795      Optional repetition of zero or more of the given expression.
    3796
    3797      Parameters:
    3798       - expr - expression that must match zero or more times
    3799       - stopOn - (default=C{None}) - expression for a terminating sentinel
    3800            (only required if the sentinel would ordinarily match the repetition
    3801            expression)
    3802
    3803      Example: similar to L{OneOrMore}
    3804      """
    3805 -    def __init__( self, expr, stopOn=None):
    3806          super(ZeroOrMore,self).__init__(expr, stopOn=stopOn)
    3807          self.mayReturnEmpty = True
    3808
    3809 -    def parseImpl( self, instring, loc, doActions=True ):
    3810          try:
    3811              return super(ZeroOrMore, self).parseImpl(instring, loc, doActions)
    3812          except (ParseException,IndexError):
    3813              return loc, []
    3814
    3815 -    def __str__( self ):
    3816          if hasattr(self,"name"):
    3817              return self.name
    3818
    3819          if self.strRepr is None:
    3820              self.strRepr = "[" + _ustr(self.expr) + "]..."
    3821
    3822          return self.strRepr
    3823
    3824 -class _NullToken(object):
    3825 -    def __bool__(self):
    3826          return False
    3827      __nonzero__ = __bool__
    3828 -    def __str__(self):
    3829          return ""
    3830
    3831  _optionalNotMatched = _NullToken()
    3832 -class Optional(ParseElementEnhance):
    3833      """
    3834      Optional matching of the given expression.
    3835
    3836      Parameters:
    3837       - expr - expression that must match zero or more times
    3838       - default (optional) - value to be returned if the optional expression is not found.
    3839
    3840      Example::
    3841          # US postal code can be a 5-digit zip, plus optional 4-digit qualifier
    3842          zip = Combine(Word(nums, exact=5) + Optional('-' + Word(nums, exact=4)))
    3843          zip.runTests('''
    3844              # traditional ZIP code
    3845              12345
    3846
    3847              # ZIP+4 form
    3848              12101-0001
    3849
    3850              # invalid ZIP
    3851              98765-
    3852              ''')
    3853      prints::
    3854          # traditional ZIP code
    3855          12345
    3856          ['12345']
    3857
    3858          # ZIP+4 form
    3859          12101-0001
    3860          ['12101-0001']
    3861
    3862          # invalid ZIP
    3863          98765-
    3864               ^
    3865          FAIL: Expected end of text (at char 5), (line:1, col:6)
    3866      """
    3867 -    def __init__( self, expr, default=_optionalNotMatched ):
    3868          super(Optional,self).__init__( expr, savelist=False )
    3869          self.defaultValue = default
    3870          self.mayReturnEmpty = True
    3871
    3872 -    def parseImpl( self, instring, loc, doActions=True ):
    3873          try:
    3874              loc, tokens = self.expr._parse( instring, loc, doActions, callPreParse=False )
    3875          except (ParseException,IndexError):
    3876              if self.defaultValue is not _optionalNotMatched:
    3877                  if self.expr.resultsName:
    3878                      tokens = ParseResults([ self.defaultValue ])
    3879                      tokens[self.expr.resultsName] = self.defaultValue
    3880                  else:
    3881                      tokens = [ self.defaultValue ]
    3882              else:
    3883                  tokens = []
    3884          return loc, tokens
    3885
    3886 -    def __str__( self ):
    3887          if hasattr(self,"name"):
    3888              return self.name
    3889
    3890          if self.strRepr is None:
    3891              self.strRepr = "[" + _ustr(self.expr) + "]"
    3892
    3893          return self.strRepr
    3894
    3895 -class SkipTo(ParseElementEnhance):
    3896      """
    3897      Token for skipping over all undefined text until the matched expression is found.
    3898
    3899      Parameters:
    3900       - expr - target expression marking the end of the data to be skipped
    3901       - include - (default=C{False}) if True, the target expression is also parsed
    3902            (the skipped text and target expression are returned as a 2-element list).
    3903       - ignore - (default=C{None}) used to define grammars (typically quoted strings and
    3904            comments) that might contain false matches to the target expression
    3905       - failOn - (default=C{None}) define expressions that are not allowed to be
    3906            included in the skipped test; if found before the target expression is found,
    3907            the SkipTo is not a match
    3908
    3909      Example::
    3910          report = '''
    3911              Outstanding Issues Report - 1 Jan 2000
    3912
    3913                 # | Severity | Description                               |  Days Open
    3914              -----+----------+-------------------------------------------+-----------
    3915               101 | Critical | Intermittent system crash                 |          6
    3916                94 | Cosmetic | Spelling error on Login ('log|n')         |         14
    3917                79 | Minor    | System slow when running too many reports |         47
    3918              '''
    3919          integer = Word(nums)
    3920          SEP = Suppress('|')
    3921          # use SkipTo to simply match everything up until the next SEP
    3922          # - ignore quoted strings, so that a '|' character inside a quoted string does not match
    3923          # - parse action will call token.strip() for each matched token, i.e., the description body
    3924          string_data = SkipTo(SEP, ignore=quotedString)
    3925          string_data.setParseAction(tokenMap(str.strip))
    3926          ticket_expr = (integer("issue_num") + SEP
    3927                        + string_data("sev") + SEP
    3928                        + string_data("desc") + SEP
    3929                        + integer("days_open"))
    3930
    3931          for tkt in ticket_expr.searchString(report):
    3932              print tkt.dump()
    3933      prints::
    3934          ['101', 'Critical', 'Intermittent system crash', '6']
    3935          - days_open: 6
    3936          - desc: Intermittent system crash
    3937          - issue_num: 101
    3938          - sev: Critical
    3939          ['94', 'Cosmetic', "Spelling error on Login ('log|n')", '14']
    3940          - days_open: 14
    3941          - desc: Spelling error on Login ('log|n')
    3942          - issue_num: 94
    3943          - sev: Cosmetic
    3944          ['79', 'Minor', 'System slow when running too many reports', '47']
    3945          - days_open: 47
    3946          - desc: System slow when running too many reports
    3947          - issue_num: 79
    3948          - sev: Minor
    3949      """
    3950 -    def __init__( self, other, include=False, ignore=None, failOn=None ):
    3951          super( SkipTo, self ).__init__( other )
    3952          self.ignoreExpr = ignore
    3953          self.mayReturnEmpty = True
    3954          self.mayIndexError = False
    3955          self.includeMatch = include
    3956          self.asList = False
    3957          if isinstance(failOn, basestring):
    3958              self.failOn = ParserElement._literalStringClass(failOn)
    3959          else:
    3960              self.failOn = failOn
    3961          self.errmsg = "No match found for "+_ustr(self.expr)
    3962
    3963 -    def parseImpl( self, instring, loc, doActions=True ):
    3964          startloc = loc
    3965          instrlen = len(instring)
    3966          expr = self.expr
    3967          expr_parse = self.expr._parse
    3968          self_failOn_canParseNext = self.failOn.canParseNext if self.failOn is not None else None
    3969          self_ignoreExpr_tryParse = self.ignoreExpr.tryParse if self.ignoreExpr is not None else None
    3970
    3971          tmploc = loc
    3972          while tmploc <= instrlen:
    3973              if self_failOn_canParseNext is not None:
    3974                  # break if failOn expression matches
    3975                  if self_failOn_canParseNext(instring, tmploc):
    3976                      break
    3977
    3978              if self_ignoreExpr_tryParse is not None:
    3979                  # advance past ignore expressions
    3980                  while 1:
    3981                      try:
    3982                          tmploc = self_ignoreExpr_tryParse(instring, tmploc)
    3983                      except ParseBaseException:
    3984                          break
    3985
    3986              try:
    3987                  expr_parse(instring, tmploc, doActions=False, callPreParse=False)
    3988              except (ParseException, IndexError):
    3989                  # no match, advance loc in string
    3990                  tmploc += 1
    3991              else:
    3992                  # matched skipto expr, done
    3993                  break
    3994
    3995          else:
    3996              # ran off the end of the input string without matching skipto expr, fail
    3997              raise ParseException(instring, loc, self.errmsg, self)
    3998
    3999          # build up return values
    4000          loc = tmploc
    4001          skiptext = instring[startloc:loc]
    4002          skipresult = ParseResults(skiptext)
    4003
    4004          if self.includeMatch:
    4005              loc, mat = expr_parse(instring,loc,doActions,callPreParse=False)
    4006              skipresult += mat
    4007
    4008          return loc, skipresult
    4009
    4010 -class Forward(ParseElementEnhance):
    4011      """
    4012      Forward declaration of an expression to be defined later -
    4013      used for recursive grammars, such as algebraic infix notation.
    4014      When the expression is known, it is assigned to the C{Forward} variable using the '<<' operator.
    4015
    4016      Note: take care when assigning to C{Forward} not to overlook precedence of operators.
    4017      Specifically, '|' has a lower precedence than '<<', so that::
    4018          fwdExpr << a | b | c
    4019      will actually be evaluated as::
    4020          (fwdExpr << a) | b | c
    4021      thereby leaving b and c out as parseable alternatives.  It is recommended that you
    4022      explicitly group the values inserted into the C{Forward}::
    4023          fwdExpr << (a | b | c)
    4024      Converting to use the '<<=' operator instead will avoid this problem.
    4025
    4026      See L{ParseResults.pprint} for an example of a recursive parser created using
    4027      C{Forward}.
    4028      """
    4029 -    def __init__( self, other=None ):
    4030          super(Forward,self).__init__( other, savelist=False )
    4031
    4032 -    def __lshift__( self, other ):
    4033          if isinstance( other, basestring ):
    4034              other = ParserElement._literalStringClass(other)
    4035          self.expr = other
    4036          self.strRepr = None
    4037          self.mayIndexError = self.expr.mayIndexError
    4038          self.mayReturnEmpty = self.expr.mayReturnEmpty
    4039          self.setWhitespaceChars( self.expr.whiteChars )
    4040          self.skipWhitespace = self.expr.skipWhitespace
    4041          self.saveAsList = self.expr.saveAsList
    4042          self.ignoreExprs.extend(self.expr.ignoreExprs)
    4043          return self
    4044
    4045 -    def __ilshift__(self, other):
    4046          return self << other
    4047
    4048 -    def leaveWhitespace( self ):
    4049          self.skipWhitespace = False
    4050          return self
    4051
    4052 -    def streamline( self ):
    4053          if not self.streamlined:
    4054              self.streamlined = True
    4055              if self.expr is not None:
    4056                  self.expr.streamline()
    4057          return self
    4058
    4059 -    def validate( self, validateTrace=[] ):
    4060          if self not in validateTrace:
    4061              tmp = validateTrace[:]+[self]
    4062              if self.expr is not None:
    4063                  self.expr.validate(tmp)
    4064          self.checkRecursion([])
    4065
    4066 -    def __str__( self ):
    4067          if hasattr(self,"name"):
    4068              return self.name
    4069          return self.__class__.__name__ + ": ..."
    4070
    4071          # stubbed out for now - creates awful memory and perf issues
    4072          self._revertClass = self.__class__
    4073          self.__class__ = _ForwardNoRecurse
    4074          try:
    4075              if self.expr is not None:
    4076                  retString = _ustr(self.expr)
    4077              else:
    4078                  retString = "None"
    4079          finally:
    4080              self.__class__ = self._revertClass
    4081          return self.__class__.__name__ + ": " + retString
    4082
    4083 -    def copy(self):
    4084          if self.expr is not None:
    4085              return super(Forward,self).copy()
    4086          else:
    4087              ret = Forward()
    4088              ret <<= self
    4089              return ret
    4090
    4091 -class _ForwardNoRecurse(Forward):
    4092 -    def __str__( self ):
    4093          return "..."
    4094
    4095 -class TokenConverter(ParseElementEnhance):
    4096      """
    4097      Abstract subclass of C{ParseExpression}, for converting parsed results.
    4098      """
    4099 -    def __init__( self, expr, savelist=False ):
    4100          super(TokenConverter,self).__init__( expr )#, savelist )
    4101          self.saveAsList = False
    4102
    4103 -class Combine(TokenConverter):
    4104      """
    4105      Converter to concatenate all matching tokens to a single string.
    4106      By default, the matching patterns must also be contiguous in the input string;
    4107      this can be disabled by specifying C{'adjacent=False'} in the constructor.
    4108
    4109      Example::
    4110          real = Word(nums) + '.' + Word(nums)
    4111          print(real.parseString('3.1416')) # -> ['3', '.', '1416']
    4112          # will also erroneously match the following
    4113          print(real.parseString('3. 1416')) # -> ['3', '.', '1416']
    4114
    4115          real = Combine(Word(nums) + '.' + Word(nums))
    4116          print(real.parseString('3.1416')) # -> ['3.1416']
    4117          # no match when there are internal spaces
    4118          print(real.parseString('3. 1416')) # -> Exception: Expected W:(0123...)
    4119      """
    4120 -    def __init__( self, expr, joinString="", adjacent=True ):
    4121          super(Combine,self).__init__( expr )
    4122          # suppress whitespace-stripping in contained parse expressions, but re-enable it on the Combine itself
    4123          if adjacent:
    4124              self.leaveWhitespace()
    4125          self.adjacent = adjacent
    4126          self.skipWhitespace = True
    4127          self.joinString = joinString
    4128          self.callPreparse = True
    4129
    4130 -    def ignore( self, other ):
    4131          if self.adjacent:
    4132              ParserElement.ignore(self, other)
    4133          else:
    4134              super( Combine, self).ignore( other )
    4135          return self
    4136
    4137 -    def postParse( self, instring, loc, tokenlist ):
    4138          retToks = tokenlist.copy()
    4139          del retToks[:]
    4140          retToks += ParseResults([ "".join(tokenlist._asStringList(self.joinString)) ], modal=self.modalResults)
    4141
    4142          if self.resultsName and retToks.haskeys():
    4143              return [ retToks ]
    4144          else:
    4145              return retToks
    4146
    4147 -class Group(TokenConverter):
    4148      """
    4149      Converter to return the matched tokens as a list - useful for returning tokens of C{L{ZeroOrMore}} and C{L{OneOrMore}} expressions.
    4150
    4151      Example::
    4152          ident = Word(alphas)
    4153          num = Word(nums)
    4154          term = ident | num
    4155          func = ident + Optional(delimitedList(term))
    4156          print(func.parseString("fn a,b,100"))  # -> ['fn', 'a', 'b', '100']
    4157
    4158          func = ident + Group(Optional(delimitedList(term)))
    4159          print(func.parseString("fn a,b,100"))  # -> ['fn', ['a', 'b', '100']]
    4160      """
    4161 -    def __init__( self, expr ):
    4162          super(Group,self).__init__( expr )
    4163          self.saveAsList = True
    4164
    4165 -    def postParse( self, instring, loc, tokenlist ):
    4166          return [ tokenlist ]
    4167
    4168 -class Dict(TokenConverter):
    4169      """
    4170      Converter to return a repetitive expression as a list, but also as a dictionary.
    4171      Each element can also be referenced using the first token in the expression as its key.
    4172      Useful for tabular report scraping when the first column can be used as a item key.
    4173
    4174      Example::
    4175          data_word = Word(alphas)
    4176          label = data_word + FollowedBy(':')
    4177          attr_expr = Group(label + Suppress(':') + OneOrMore(data_word).setParseAction(' '.join))
    4178
    4179          text = "shape: SQUARE posn: upper left color: light blue texture: burlap"
    4180          attr_expr = (label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))
    4181
    4182          # print attributes as plain groups
    4183          print(OneOrMore(attr_expr).parseString(text).dump())
    4184
    4185          # instead of OneOrMore(expr), parse using Dict(OneOrMore(Group(expr))) - Dict will auto-assign names
    4186          result = Dict(OneOrMore(Group(attr_expr))).parseString(text)
    4187          print(result.dump())
    4188
    4189          # access named fields as dict entries, or output as dict
    4190          print(result['shape'])
    4191          print(result.asDict())
    4192      prints::
    4193          ['shape', 'SQUARE', 'posn', 'upper left', 'color', 'light blue', 'texture', 'burlap']
    4194
    4195          [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']]
    4196          - color: light blue
    4197          - posn: upper left
    4198          - shape: SQUARE
    4199          - texture: burlap
    4200          SQUARE
    4201          {'color': 'light blue', 'posn': 'upper left', 'texture': 'burlap', 'shape': 'SQUARE'}
    4202      See more examples at L{ParseResults} of accessing fields by results name.
    4203      """
    4204 -    def __init__( self, expr ):
    4205          super(Dict,self).__init__( expr )
    4206          self.saveAsList = True
    4207
    4208 -    def postParse( self, instring, loc, tokenlist ):
    4209          for i,tok in enumerate(tokenlist):
    4210              if len(tok) == 0:
    4211                  continue
    4212              ikey = tok[0]
    4213              if isinstance(ikey,int):
    4214                  ikey = _ustr(tok[0]).strip()
    4215              if len(tok)==1:
    4216                  tokenlist[ikey] = _ParseResultsWithOffset("",i)
    4217              elif len(tok)==2 and not isinstance(tok[1],ParseResults):
    4218                  tokenlist[ikey] = _ParseResultsWithOffset(tok[1],i)
    4219              else:
    4220                  dictvalue = tok.copy() #ParseResults(i)
    4221                  del dictvalue[0]
    4222                  if len(dictvalue)!= 1 or (isinstance(dictvalue,ParseResults) and dictvalue.haskeys()):
    4223                      tokenlist[ikey] = _ParseResultsWithOffset(dictvalue,i)
    4224                  else:
    4225                      tokenlist[ikey] = _ParseResultsWithOffset(dictvalue[0],i)
    4226
    4227          if self.resultsName:
    4228              return [ tokenlist ]
    4229          else:
    4230              return tokenlist
    4231
    4232
    4233 -class Suppress(TokenConverter):
    4234      """
    4235      Converter for ignoring the results of a parsed expression.
    4236
    4237      Example::
    4238          source = "a, b, c,d"
    4239          wd = Word(alphas)
    4240          wd_list1 = wd + ZeroOrMore(',' + wd)
    4241          print(wd_list1.parseString(source))
    4242
    4243          # often, delimiters that are useful during parsing are just in the
    4244          # way afterward - use Suppress to keep them out of the parsed output
    4245          wd_list2 = wd + ZeroOrMore(Suppress(',') + wd)
    4246          print(wd_list2.parseString(source))
    4247      prints::
    4248          ['a', ',', 'b', ',', 'c', ',', 'd']
    4249          ['a', 'b', 'c', 'd']
    4250      (See also L{delimitedList}.)
    4251      """
    4252 -    def postParse( self, instring, loc, tokenlist ):
    4253          return []
    4254
    4255 -    def suppress( self ):
    4256          return self
    4257
    4258
    4259 -class OnlyOnce(object):
    4260      """
    4261      Wrapper for parse actions, to ensure they are only called once.
    4262      """
    4263 -    def __init__(self, methodCall):
    4264          self.callable = _trim_arity(methodCall)
    4265          self.called = False
    4266 -    def __call__(self,s,l,t):
    4267          if not self.called:
    4268              results = self.callable(s,l,t)
    4269              self.called = True
    4270              return results
    4271          raise ParseException(s,l,"")
    4272 -    def reset(self):
    4273          self.called = False
    4274
    4275 -def traceParseAction(f):
    4276      """
    4277      Decorator for debugging parse actions.
    4278
    4279      Example::
    4280          wd = Word(alphas)
    4281
    4282          @traceParseAction
    4283          def remove_duplicate_chars(tokens):
    4284              return ''.join(sorted(set(''.join(tokens)))
    4285
    4286          wds = OneOrMore(wd).setParseAction(remove_duplicate_chars)
    4287          print(wds.parseString("slkdjs sld sldd sdlf sdljf"))
    4288      prints::
    4289          >>entering remove_duplicate_chars(line: 'slkdjs sld sldd sdlf sdljf', 0, (['slkdjs', 'sld', 'sldd', 'sdlf', 'sdljf'], {}))
    4290          <<leaving remove_duplicate_chars (ret: 'dfjkls')
    4291          ['dfjkls']
    4292      """
    4293      f = _trim_arity(f)
    4294      def z(*paArgs):
    4295          thisFunc = f.__name__
    4296          s,l,t = paArgs[-3:]
    4297          if len(paArgs)>3:
    4298              thisFunc = paArgs[0].__class__.__name__ + '.' + thisFunc
    4299          sys.stderr.write( ">>entering %s(line: '%s', %d, %r)\n" % (thisFunc,line(l,s),l,t) )
    4300          try:
    4301              ret = f(*paArgs)
    4302          except Exception as exc:
    4303              sys.stderr.write( "<<leaving %s (exception: %s)\n" % (thisFunc,exc) )
    4304              raise
    4305          sys.stderr.write( "<<leaving %s (ret: %r)\n" % (thisFunc,ret) )
    4306          return ret
    4307      try:
    4308          z.__name__ = f.__name__
    4309      except AttributeError:
    4310          pass
    4311      return z
    4312
    4313  #
    4314  # global helpers
    4315  #
    4316 -def delimitedList( expr, delim=",", combine=False ):
    4317      """
    4318      Helper to define a delimited list of expressions - the delimiter defaults to ','.
    4319      By default, the list elements and delimiters can have intervening whitespace, and
    4320      comments, but this can be overridden by passing C{combine=True} in the constructor.
    4321      If C{combine} is set to C{True}, the matching tokens are returned as a single token
    4322      string, with the delimiters included; otherwise, the matching tokens are returned
    4323      as a list of tokens, with the delimiters suppressed.
    4324
    4325      Example::
    4326          delimitedList(Word(alphas)).parseString("aa,bb,cc") # -> ['aa', 'bb', 'cc']
    4327          delimitedList(Word(hexnums), delim=':', combine=True).parseString("AA:BB:CC:DD:EE") # -> ['AA:BB:CC:DD:EE']
    4328      """
    4329      dlName = _ustr(expr)+" ["+_ustr(delim)+" "+_ustr(expr)+"]..."
    4330      if combine:
    4331          return Combine( expr + ZeroOrMore( delim + expr ) ).setName(dlName)
    4332      else:
    4333          return ( expr + ZeroOrMore( Suppress( delim ) + expr ) ).setName(dlName)
    4334
    4335 -def countedArray( expr, intExpr=None ):
    4336      """
    4337      Helper to define a counted list of expressions.
    4338      This helper defines a pattern of the form::
    4339          integer expr expr expr...
    4340      where the leading integer tells how many expr expressions follow.
    4341      The matched tokens returns the array of expr tokens as a list - the leading count token is suppressed.
    4342
    4343      Example::
    4344          countedArray(Word(alphas)).parseString('2 ab cd ef')  # -> ['ab', 'cd']
    4345      """
    4346      arrayExpr = Forward()
    4347      def countFieldParseAction(s,l,t):
    4348          n = t[0]
    4349          arrayExpr << (n and Group(And([expr]*n)) or Group(empty))
    4350          return []
    4351      if intExpr is None:
    4352          intExpr = Word(nums).setParseAction(lambda t:int(t[0]))
    4353      else:
    4354          intExpr = intExpr.copy()
    4355      intExpr.setName("arrayLen")
    4356      intExpr.addParseAction(countFieldParseAction, callDuringTry=True)
    4357      return ( intExpr + arrayExpr ).setName('(len) ' + _ustr(expr) + '...')
    4358
    4359 -def _flatten(L):
    4360      ret = []
    4361      for i in L:
    4362          if isinstance(i,list):
    4363              ret.extend(_flatten(i))
    4364          else:
    4365              ret.append(i)
    4366      return ret
    4367
    4368 -def matchPreviousLiteral(expr):
    4369      """
    4370      Helper to define an expression that is indirectly defined from
    4371      the tokens matched in a previous expression, that is, it looks
    4372      for a 'repeat' of a previous expression.  For example::
    4373          first = Word(nums)
    4374          second = matchPreviousLiteral(first)
    4375          matchExpr = first + ":" + second
    4376      will match C{"1:1"}, but not C{"1:2"}.  Because this matches a
    4377      previous literal, will also match the leading C{"1:1"} in C{"1:10"}.
    4378      If this is not desired, use C{matchPreviousExpr}.
    4379      Do I{not} use with packrat parsing enabled.
    4380      """
    4381      rep = Forward()
    4382      def copyTokenToRepeater(s,l,t):
    4383          if t:
    4384              if len(t) == 1:
    4385                  rep << t[0]
    4386              else:
    4387                  # flatten t tokens
    4388                  tflat = _flatten(t.asList())
    4389                  rep << And(Literal(tt) for tt in tflat)
    4390          else:
    4391              rep << Empty()
    4392      expr.addParseAction(copyTokenToRepeater, callDuringTry=True)
    4393      rep.setName('(prev) ' + _ustr(expr))
    4394      return rep
    4395
    4396 -def matchPreviousExpr(expr):
    4397      """
    4398      Helper to define an expression that is indirectly defined from
    4399      the tokens matched in a previous expression, that is, it looks
    4400      for a 'repeat' of a previous expression.  For example::
    4401          first = Word(nums)
    4402          second = matchPreviousExpr(first)
    4403          matchExpr = first + ":" + second
    4404      will match C{"1:1"}, but not C{"1:2"}.  Because this matches by
    4405      expressions, will I{not} match the leading C{"1:1"} in C{"1:10"};
    4406      the expressions are evaluated first, and then compared, so
    4407      C{"1"} is compared with C{"10"}.
    4408      Do I{not} use with packrat parsing enabled.
    4409      """
    4410      rep = Forward()
    4411      e2 = expr.copy()
    4412      rep <<= e2
    4413      def copyTokenToRepeater(s,l,t):
    4414          matchTokens = _flatten(t.asList())
    4415          def mustMatchTheseTokens(s,l,t):
    4416              theseTokens = _flatten(t.asList())
    4417              if  theseTokens != matchTokens:
    4418                  raise ParseException("",0,"")
    4419          rep.setParseAction( mustMatchTheseTokens, callDuringTry=True )
    4420      expr.addParseAction(copyTokenToRepeater, callDuringTry=True)
    4421      rep.setName('(prev) ' + _ustr(expr))
    4422      return rep
    4423
    4424 -def _escapeRegexRangeChars(s):
    4425      #~  escape these chars: ^-]
    4426      for c in r"\^-]":
    4427          s = s.replace(c,_bslash+c)
    4428      s = s.replace("\n",r"\n")
    4429      s = s.replace("\t",r"\t")
    4430      return _ustr(s)
    4431
    4432 -def oneOf( strs, caseless=False, useRegex=True ):
    4433      """
    4434      Helper to quickly define a set of alternative Literals, and makes sure to do
    4435      longest-first testing when there is a conflict, regardless of the input order,
    4436      but returns a C{L{MatchFirst}} for best performance.
    4437
    4438      Parameters:
    4439       - strs - a string of space-delimited literals, or a collection of string literals
    4440       - caseless - (default=C{False}) - treat all literals as caseless
    4441       - useRegex - (default=C{True}) - as an optimization, will generate a Regex
    4442            object; otherwise, will generate a C{MatchFirst} object (if C{caseless=True}, or
    4443            if creating a C{Regex} raises an exception)
    4444
    4445      Example::
    4446          comp_oper = oneOf("< = > <= >= !=")
    4447          var = Word(alphas)
    4448          number = Word(nums)
    4449          term = var | number
    4450          comparison_expr = term + comp_oper + term
    4451          print(comparison_expr.searchString("B = 12  AA=23 B<=AA AA>12"))
    4452      prints::
    4453          [['B', '=', '12'], ['AA', '=', '23'], ['B', '<=', 'AA'], ['AA', '>', '12']]
    4454      """
    4455      if caseless:
    4456          isequal = ( lambda a,b: a.upper() == b.upper() )
    4457          masks = ( lambda a,b: b.upper().startswith(a.upper()) )
    4458          parseElementClass = CaselessLiteral
    4459      else:
    4460          isequal = ( lambda a,b: a == b )
    4461          masks = ( lambda a,b: b.startswith(a) )
    4462          parseElementClass = Literal
    4463
    4464      symbols = []
    4465      if isinstance(strs,basestring):
    4466          symbols = strs.split()
    4467      elif isinstance(strs, collections.Iterable):
    4468          symbols = list(strs)
    4469      else:
    4470          warnings.warn("Invalid argument to oneOf, expected string or iterable",
    4471                  SyntaxWarning, stacklevel=2)
    4472      if not symbols:
    4473          return NoMatch()
    4474
    4475      i = 0
    4476      while i < len(symbols)-1:
    4477          cur = symbols[i]
    4478          for j,other in enumerate(symbols[i+1:]):
    4479              if ( isequal(other, cur) ):
    4480                  del symbols[i+j+1]
    4481                  break
    4482              elif ( masks(cur, other) ):
    4483                  del symbols[i+j+1]
    4484                  symbols.insert(i,other)
    4485                  cur = other
    4486                  break
    4487          else:
    4488              i += 1
    4489
    4490      if not caseless and useRegex:
    4491          #~ print (strs,"->", "|".join( [ _escapeRegexChars(sym) for sym in symbols] ))
    4492          try:
    4493              if len(symbols)==len("".join(symbols)):
    4494                  return Regex( "[%s]" % "".join(_escapeRegexRangeChars(sym) for sym in symbols) ).setName(' | '.join(symbols))
    4495              else:
    4496                  return Regex( "|".join(re.escape(sym) for sym in symbols) ).setName(' | '.join(symbols))
    4497          except:
    4498              warnings.warn("Exception creating Regex for oneOf, building MatchFirst",
    4499                      SyntaxWarning, stacklevel=2)
    4500
    4501
    4502      # last resort, just use MatchFirst
    4503      return MatchFirst(parseElementClass(sym) for sym in symbols).setName(' | '.join(symbols))
    4504
    4505 -def dictOf( key, value ):
    4506      """
    4507      Helper to easily and clearly define a dictionary by specifying the respective patterns
    4508      for the key and value.  Takes care of defining the C{L{Dict}}, C{L{ZeroOrMore}}, and C{L{Group}} tokens
    4509      in the proper order.  The key pattern can include delimiting markers or punctuation,
    4510      as long as they are suppressed, thereby leaving the significant key text.  The value
    4511      pattern can include named results, so that the C{Dict} results can include named token
    4512      fields.
    4513
    4514      Example::
    4515          text = "shape: SQUARE posn: upper left color: light blue texture: burlap"
    4516          attr_expr = (label + Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join))
    4517          print(OneOrMore(attr_expr).parseString(text).dump())
    4518
    4519          attr_label = label
    4520          attr_value = Suppress(':') + OneOrMore(data_word, stopOn=label).setParseAction(' '.join)
    4521
    4522          # similar to Dict, but simpler call format
    4523          result = dictOf(attr_label, attr_value).parseString(text)
    4524          print(result.dump())
    4525          print(result['shape'])
    4526          print(result.shape)  # object attribute access works too
    4527          print(result.asDict())
    4528      prints::
    4529          [['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']]
    4530          - color: light blue
    4531          - posn: upper left
    4532          - shape: SQUARE
    4533          - texture: burlap
    4534          SQUARE
    4535          SQUARE
    4536          {'color': 'light blue', 'shape': 'SQUARE', 'posn': 'upper left', 'texture': 'burlap'}
    4537      """
    4538      return Dict( ZeroOrMore( Group ( key + value ) ) )
    4539
    4540 -def originalTextFor(expr, asString=True):
    4541      """
    4542      Helper to return the original, untokenized text for a given expression.  Useful to
    4543      restore the parsed fields of an HTML start tag into the raw tag text itself, or to
    4544      revert separate tokens with intervening whitespace back to the original matching
    4545      input text. By default, returns astring containing the original parsed text.
    4546
    4547      If the optional C{asString} argument is passed as C{False}, then the return value is a
    4548      C{L{ParseResults}} containing any results names that were originally matched, and a
    4549      single token containing the original matched text from the input string.  So if
    4550      the expression passed to C{L{originalTextFor}} contains expressions with defined
    4551      results names, you must set C{asString} to C{False} if you want to preserve those
    4552      results name values.
    4553
    4554      Example::
    4555          src = "this is test <b> bold <i>text</i> </b> normal text "
    4556          for tag in ("b","i"):
    4557              opener,closer = makeHTMLTags(tag)
    4558              patt = originalTextFor(opener + SkipTo(closer) + closer)
    4559              print(patt.searchString(src)[0])
    4560      prints::
    4561          ['<b> bold <i>text</i> </b>']
    4562          ['<i>text</i>']
    4563      """
    4564      locMarker = Empty().setParseAction(lambda s,loc,t: loc)
    4565      endlocMarker = locMarker.copy()
    4566      endlocMarker.callPreparse = False
    4567      matchExpr = locMarker("_original_start") + expr + endlocMarker("_original_end")
    4568      if asString:
    4569          extractText = lambda s,l,t: s[t._original_start:t._original_end]
    4570      else:
    4571          def extractText(s,l,t):
    4572              t[:] = [s[t.pop('_original_start'):t.pop('_original_end')]]
    4573      matchExpr.setParseAction(extractText)
    4574      matchExpr.ignoreExprs = expr.ignoreExprs
    4575      return matchExpr
    4576
    4577 -def ungroup(expr):
    4578      """
    4579      Helper to undo pyparsing's default grouping of And expressions, even
    4580      if all but one are non-empty.
    4581      """
    4582      return TokenConverter(expr).setParseAction(lambda t:t[0])
    4583
    4584 -def locatedExpr(expr):
    4585      """
    4586      Helper to decorate a returned token with its starting and ending locations in the input string.
    4587      This helper adds the following results names:
    4588       - locn_start = location where matched expression begins
    4589       - locn_end = location where matched expression ends
    4590       - value = the actual parsed results
    4591
    4592      Be careful if the input text contains C{<TAB>} characters, you may want to call
    4593      C{L{ParserElement.parseWithTabs}}
    4594
    4595      Example::
    4596          wd = Word(alphas)
    4597          for match in locatedExpr(wd).searchString("ljsdf123lksdjjf123lkkjj1222"):
    4598              print(match)
    4599      prints::
    4600          [[0, 'ljsdf', 5]]
    4601          [[8, 'lksdjjf', 15]]
    4602          [[18, 'lkkjj', 23]]
    4603      """
    4604      locator = Empty().setParseAction(lambda s,l,t: l)
    4605      return Group(locator("locn_start") + expr("value") + locator.copy().leaveWhitespace()("locn_end"))
    4606
    4607
    4608  # convenience constants for positional expressions
    4609  empty       = Empty().setName("empty")
    4610  lineStart   = LineStart().setName("lineStart")
    4611  lineEnd     = LineEnd().setName("lineEnd")
    4612  stringStart = StringStart().setName("stringStart")
    4613  stringEnd   = StringEnd().setName("stringEnd")
    4614
    4615  _escapedPunc = Word( _bslash, r"\[]-*.$+^?()~ ", exact=2 ).setParseAction(lambda s,l,t:t[0][1])
    4616  _escapedHexChar = Regex(r"\\0?[xX][0-9a-fA-F]+").setParseAction(lambda s,l,t:unichr(int(t[0].lstrip(r'\0x'),16)))
    4617  _escapedOctChar = Regex(r"\\0[0-7]+").setParseAction(lambda s,l,t:unichr(int(t[0][1:],8)))
    4618  _singleChar = _escapedPunc | _escapedHexChar | _escapedOctChar | Word(printables, excludeChars=r'\]', exact=1) | Regex(r"\w", re.UNICODE)
    4619  _charRange = Group(_singleChar + Suppress("-") + _singleChar)
    4620  _reBracketExpr = Literal("[") + Optional("^").setResultsName("negate") + Group( OneOrMore( _charRange | _singleChar ) ).setResultsName("body") + "]"
    4621
    4622 -def srange(s):
    4623      r"""
    4624      Helper to easily define string ranges for use in Word construction.  Borrows
    4625      syntax from regexp '[]' string range definitions::
    4626          srange("[0-9]")   -> "0123456789"
    4627          srange("[a-z]")   -> "abcdefghijklmnopqrstuvwxyz"
    4628          srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_"
    4629      The input string must be enclosed in []'s, and the returned string is the expanded
    4630      character set joined into a single string.
    4631      The values enclosed in the []'s may be:
    4632       - a single character
    4633       - an escaped character with a leading backslash (such as C{\-} or C{\]})
    4634       - an escaped hex character with a leading C{'\x'} (C{\x21}, which is a C{'!'} character)
    4635           (C{\0x##} is also supported for backwards compatibility)
    4636       - an escaped octal character with a leading C{'\0'} (C{\041}, which is a C{'!'} character)
    4637       - a range of any of the above, separated by a dash (C{'a-z'}, etc.)
    4638       - any combination of the above (C{'aeiouy'}, C{'a-zA-Z0-9_$'}, etc.)
    4639      """
    4640      _expanded = lambda p: p if not isinstance(p,ParseResults) else ''.join(unichr(c) for c in range(ord(p[0]),ord(p[1])+1))
    4641      try:
    4642          return "".join(_expanded(part) for part in _reBracketExpr.parseString(s).body)
    4643      except:
    4644          return ""
    4645
    4646 -def matchOnlyAtCol(n):
    4647      """
    4648      Helper method for defining parse actions that require matching at a specific
    4649      column in the input text.
    4650      """
    4651      def verifyCol(strg,locn,toks):
    4652          if col(locn,strg) != n:
    4653              raise ParseException(strg,locn,"matched token not at column %d" % n)
    4654      return verifyCol
    4655
    4656 -def replaceWith(replStr):
    4657      """
    4658      Helper method for common parse actions that simply return a literal value.  Especially
    4659      useful when used with C{L{transformString<ParserElement.transformString>}()}.
    4660
    4661      Example::
    4662          num = Word(nums).setParseAction(lambda toks: int(toks[0]))
    4663          na = oneOf("N/A NA").setParseAction(replaceWith(math.nan))
    4664          term = na | num
    4665
    4666          OneOrMore(term).parseString("324 234 N/A 234") # -> [324, 234, nan, 234]
    4667      """
    4668      return lambda s,l,t: [replStr]
    4669
    4670 -def removeQuotes(s,l,t):
    4671      """
    4672      Helper parse action for removing quotation marks from parsed quoted strings.
    4673
    4674      Example::
    4675          # by default, quotation marks are included in parsed results
    4676          quotedString.parseString("'Now is the Winter of our Discontent'") # -> ["'Now is the Winter of our Discontent'"]
    4677
    4678          # use removeQuotes to strip quotation marks from parsed results
    4679          quotedString.setParseAction(removeQuotes)
    4680          quotedString.parseString("'Now is the Winter of our Discontent'") # -> ["Now is the Winter of our Discontent"]
    4681      """
    4682      return t[0][1:-1]
    4683
    4684 -def tokenMap(func, *args):
    4685      """
    4686      Helper to define a parse action by mapping a function to all elements of a ParseResults list.If any additional
    4687      args are passed, they are forwarded to the given function as additional arguments after
    4688      the token, as in C{hex_integer = Word(hexnums).setParseAction(tokenMap(int, 16))}, which will convert the
    4689      parsed data to an integer using base 16.
    4690
    4691      Example (compare the last to example in L{ParserElement.transformString}::
    4692          hex_ints = OneOrMore(Word(hexnums)).setParseAction(tokenMap(int, 16))
    4693          hex_ints.runTests('''
    4694              00 11 22 aa FF 0a 0d 1a
    4695              ''')
    4696
    4697          upperword = Word(alphas).setParseAction(tokenMap(str.upper))
    4698          OneOrMore(upperword).runTests('''
    4699              my kingdom for a horse
    4700              ''')
    4701
    4702          wd = Word(alphas).setParseAction(tokenMap(str.title))
    4703          OneOrMore(wd).setParseAction(' '.join).runTests('''
    4704              now is the winter of our discontent made glorious summer by this sun of york
    4705              ''')
    4706      prints::
    4707          00 11 22 aa FF 0a 0d 1a
    4708          [0, 17, 34, 170, 255, 10, 13, 26]
    4709
    4710          my kingdom for a horse
    4711          ['MY', 'KINGDOM', 'FOR', 'A', 'HORSE']
    4712
    4713          now is the winter of our discontent made glorious summer by this sun of york
    4714          ['Now Is The Winter Of Our Discontent Made Glorious Summer By This Sun Of York']
    4715      """
    4716      def pa(s,l,t):
    4717          return [func(tokn, *args) for tokn in t]
    4718
    4719      try:
    4720          func_name = getattr(func, '__name__',
    4721                              getattr(func, '__class__').__name__)
    4722      except Exception:
    4723          func_name = str(func)
    4724      pa.__name__ = func_name
    4725
    4726      return pa
    4727
    4728  upcaseTokens = tokenMap(lambda t: _ustr(t).upper())
    4729  """Helper parse action to convert tokens to upper case."""
    4730
    4731  downcaseTokens = tokenMap(lambda t: _ustr(t).lower())
    4732  """Helper parse action to convert tokens to lower case."""
    4733
    4734 -def _makeTags(tagStr, xml):
    4735      """Internal helper to construct opening and closing tag expressions, given a tag name"""
    4736      if isinstance(tagStr,basestring):
    4737          resname = tagStr
    4738          tagStr = Keyword(tagStr, caseless=not xml)
    4739      else:
    4740          resname = tagStr.name
    4741
    4742      tagAttrName = Word(alphas,alphanums+"_-:")
    4743      if (xml):
    4744          tagAttrValue = dblQuotedString.copy().setParseAction( removeQuotes )
    4745          openTag = Suppress("<") + tagStr("tag") + \
    4746                  Dict(ZeroOrMore(Group( tagAttrName + Suppress("=") + tagAttrValue ))) + \
    4747                  Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">")
    4748      else:
    4749          printablesLessRAbrack = "".join(c for c in printables if c not in ">")
    4750          tagAttrValue = quotedString.copy().setParseAction( removeQuotes ) | Word(printablesLessRAbrack)
    4751          openTag = Suppress("<") + tagStr("tag") + \
    4752                  Dict(ZeroOrMore(Group( tagAttrName.setParseAction(downcaseTokens) + \
    4753                  Optional( Suppress("=") + tagAttrValue ) ))) + \
    4754                  Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">")
    4755      closeTag = Combine(_L("</") + tagStr + ">")
    4756
    4757      openTag = openTag.setResultsName("start"+"".join(resname.replace(":"," ").title().split())).setName("<%s>" % resname)
    4758      closeTag = closeTag.setResultsName("end"+"".join(resname.replace(":"," ").title().split())).setName("</%s>" % resname)
    4759      openTag.tag = resname
    4760      closeTag.tag = resname
    4761      return openTag, closeTag
    4762
    4763 -def makeHTMLTags(tagStr):
    4764      """
    4765      Helper to construct opening and closing tag expressions for HTML, given a tag name. Matches
    4766      tags in either upper or lower case, attributes with namespaces and with quoted or unquoted values.
    4767
    4768      Example::
    4769          text = '<td>More info at the <a href="http://pyparsing.wikispaces.com">pyparsing</a> wiki page</td>'
    4770          # makeHTMLTags returns pyparsing expressions for the opening and closing tags as a 2-tuple
    4771          a,a_end = makeHTMLTags("A")
    4772          link_expr = a + SkipTo(a_end)("link_text") + a_end
    4773
    4774          for link in link_expr.searchString(text):
    4775              # attributes in the <A> tag (like "href" shown here) are also accessible as named results
    4776              print(link.link_text, '->', link.href)
    4777      prints::
    4778          pyparsing -> http://pyparsing.wikispaces.com
    4779      """
    4780      return _makeTags( tagStr, False )
    4781
    4782 -def makeXMLTags(tagStr):
    4783      """
    4784      Helper to construct opening and closing tag expressions for XML, given a tag name. Matches
    4785      tags only in the given upper/lower case.
    4786
    4787      Example: similar to L{makeHTMLTags}
    4788      """
    4789      return _makeTags( tagStr, True )
    4790
    4791 -def withAttribute(*args,**attrDict):
    4792      """
    4793      Helper to create a validating parse action to be used with start tags created
    4794      with C{L{makeXMLTags}} or C{L{makeHTMLTags}}. Use C{withAttribute} to qualify a starting tag
    4795      with a required attribute value, to avoid false matches on common tags such as
    4796      C{<TD>} or C{<DIV>}.
    4797
    4798      Call C{withAttribute} with a series of attribute names and values. Specify the list
    4799      of filter attributes names and values as:
    4800       - keyword arguments, as in C{(align="right")}, or
    4801       - as an explicit dict with C{**} operator, when an attribute name is also a Python
    4802            reserved word, as in C{**{"class":"Customer", "align":"right"}}
    4803       - a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") )
    4804      For attribute names with a namespace prefix, you must use the second form.  Attribute
    4805      names are matched insensitive to upper/lower case.
    4806
    4807      If just testing for C{class} (with or without a namespace), use C{L{withClass}}.
    4808
    4809      To verify that the attribute exists, but without specifying a value, pass
    4810      C{withAttribute.ANY_VALUE} as the value.
    4811
    4812      Example::
    4813          html = '''
    4814              <div>
    4815              Some text
    4816              <div type="grid">1 4 0 1 0</div>
    4817              <div type="graph">1,3 2,3 1,1</div>
    4818              <div>this has no type</div>
    4819              </div>
    4820
    4821          '''
    4822          div,div_end = makeHTMLTags("div")
    4823
    4824          # only match div tag having a type attribute with value "grid"
    4825          div_grid = div().setParseAction(withAttribute(type="grid"))
    4826          grid_expr = div_grid + SkipTo(div | div_end)("body")
    4827          for grid_header in grid_expr.searchString(html):
    4828              print(grid_header.body)
    4829
    4830          # construct a match with any div tag having a type attribute, regardless of the value
    4831          div_any_type = div().setParseAction(withAttribute(type=withAttribute.ANY_VALUE))
    4832          div_expr = div_any_type + SkipTo(div | div_end)("body")
    4833          for div_header in div_expr.searchString(html):
    4834              print(div_header.body)
    4835      prints::
    4836          1 4 0 1 0
    4837
    4838          1 4 0 1 0
    4839          1,3 2,3 1,1
    4840      """
    4841      if args:
    4842          attrs = args[:]
    4843      else:
    4844          attrs = attrDict.items()
    4845      attrs = [(k,v) for k,v in attrs]
    4846      def pa(s,l,tokens):
    4847          for attrName,attrValue in attrs:
    4848              if attrName not in tokens:
    4849                  raise ParseException(s,l,"no matching attribute " + attrName)
    4850              if attrValue != withAttribute.ANY_VALUE and tokens[attrName] != attrValue:
    4851                  raise ParseException(s,l,"attribute '%s' has value '%s', must be '%s'" %
    4852                                              (attrName, tokens[attrName], attrValue))
    4853      return pa
    4854  withAttribute.ANY_VALUE = object()
    4855
    4856 -def withClass(classname, namespace=''):
    4857      """
    4858      Simplified version of C{L{withAttribute}} when matching on a div class - made
    4859      difficult because C{class} is a reserved word in Python.
    4860
    4861      Example::
    4862          html = '''
    4863              <div>
    4864              Some text
    4865              <div class="grid">1 4 0 1 0</div>
    4866              <div class="graph">1,3 2,3 1,1</div>
    4867              <div>this &lt;div&gt; has no class</div>
    4868              </div>
    4869
    4870          '''
    4871          div,div_end = makeHTMLTags("div")
    4872          div_grid = div().setParseAction(withClass("grid"))
    4873
    4874          grid_expr = div_grid + SkipTo(div | div_end)("body")
    4875          for grid_header in grid_expr.searchString(html):
    4876              print(grid_header.body)
    4877
    4878          div_any_type = div().setParseAction(withClass(withAttribute.ANY_VALUE))
    4879          div_expr = div_any_type + SkipTo(div | div_end)("body")
    4880          for div_header in div_expr.searchString(html):
    4881              print(div_header.body)
    4882      prints::
    4883          1 4 0 1 0
    4884
    4885          1 4 0 1 0
    4886          1,3 2,3 1,1
    4887      """
    4888      classattr = "%s:class" % namespace if namespace else "class"
    4889      return withAttribute(**{classattr : classname})
    4890
    4891  opAssoc = _Constants()
    4892  opAssoc.LEFT = object()
    4893  opAssoc.RIGHT = object()
    4894
    4895 -def infixNotation( baseExpr, opList, lpar=Suppress('('), rpar=Suppress(')') ):
    4896      """
    4897      Helper method for constructing grammars of expressions made up of
    4898      operators working in a precedence hierarchy.  Operators may be unary or
    4899      binary, left- or right-associative.  Parse actions can also be attached
    4900      to operator expressions.
    4901
    4902      Parameters:
    4903       - baseExpr - expression representing the most basic element for the nested
    4904       - opList - list of tuples, one for each operator precedence level in the
    4905        expression grammar; each tuple is of the form
    4906        (opExpr, numTerms, rightLeftAssoc, parseAction), where:
    4907         - opExpr is the pyparsing expression for the operator;
    4908            may also be a string, which will be converted to a Literal;
    4909            if numTerms is 3, opExpr is a tuple of two expressions, for the
    4910            two operators separating the 3 terms
    4911         - numTerms is the number of terms for this operator (must
    4912            be 1, 2, or 3)
    4913         - rightLeftAssoc is the indicator whether the operator is
    4914            right or left associative, using the pyparsing-defined
    4915            constants C{opAssoc.RIGHT} and C{opAssoc.LEFT}.
    4916         - parseAction is the parse action to be associated with
    4917            expressions matching this operator expression (the
    4918            parse action tuple member may be omitted)
    4919       - lpar - expression for matching left-parentheses (default=C{Suppress('(')})
    4920       - rpar - expression for matching right-parentheses (default=C{Suppress(')')})
    4921
    4922      Example::
    4923          # simple example of four-function arithmetic with ints and variable names
    4924          integer = pyparsing_common.signedInteger
    4925          varname = pyparsing_common.identifier
    4926
    4927          arith_expr = infixNotation(integer | varname,
    4928              [
    4929              ('-', 1, opAssoc.RIGHT),
    4930              (oneOf('* /'), 2, opAssoc.LEFT),
    4931              (oneOf('+ -'), 2, opAssoc.LEFT),
    4932              ])
    4933
    4934          arith_expr.runTests('''
    4935              5+3*6
    4936              (5+3)*6
    4937              -2--11
    4938              ''', fullDump=False)
    4939      prints::
    4940          5+3*6
    4941          [[5, '+', [3, '*', 6]]]
    4942
    4943          (5+3)*6
    4944          [[[5, '+', 3], '*', 6]]
    4945
    4946          -2--11
    4947          [[['-', 2], '-', ['-', 11]]]
    4948      """
    4949      ret = Forward()
    4950      lastExpr = baseExpr | ( lpar + ret + rpar )
    4951      for i,operDef in enumerate(opList):
    4952          opExpr,arity,rightLeftAssoc,pa = (operDef + (None,))[:4]
    4953          termName = "%s term" % opExpr if arity < 3 else "%s%s term" % opExpr
    4954          if arity == 3:
    4955              if opExpr is None or len(opExpr) != 2:
    4956                  raise ValueError("if numterms=3, opExpr must be a tuple or list of two expressions")
    4957              opExpr1, opExpr2 = opExpr
    4958          thisExpr = Forward().setName(termName)
    4959          if rightLeftAssoc == opAssoc.LEFT:
    4960              if arity == 1:
    4961                  matchExpr = FollowedBy(lastExpr + opExpr) + Group( lastExpr + OneOrMore( opExpr ) )
    4962              elif arity == 2:
    4963                  if opExpr is not None:
    4964                      matchExpr = FollowedBy(lastExpr + opExpr + lastExpr) + Group( lastExpr + OneOrMore( opExpr + lastExpr ) )
    4965                  else:
    4966                      matchExpr = FollowedBy(lastExpr+lastExpr) + Group( lastExpr + OneOrMore(lastExpr) )
    4967              elif arity == 3:
    4968                  matchExpr = FollowedBy(lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr) + \
    4969                              Group( lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr )
    4970              else:
    4971                  raise ValueError("operator must be unary (1), binary (2), or ternary (3)")
    4972          elif rightLeftAssoc == opAssoc.RIGHT:
    4973              if arity == 1:
    4974                  # try to avoid LR with this extra test
    4975                  if not isinstance(opExpr, Optional):
    4976                      opExpr = Optional(opExpr)
    4977                  matchExpr = FollowedBy(opExpr.expr + thisExpr) + Group( opExpr + thisExpr )
    4978              elif arity == 2:
    4979                  if opExpr is not None:
    4980                      matchExpr = FollowedBy(lastExpr + opExpr + thisExpr) + Group( lastExpr + OneOrMore( opExpr + thisExpr ) )
    4981                  else:
    4982                      matchExpr = FollowedBy(lastExpr + thisExpr) + Group( lastExpr + OneOrMore( thisExpr ) )
    4983              elif arity == 3:
    4984                  matchExpr = FollowedBy(lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr) + \
    4985                              Group( lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr )
    4986              else:
    4987                  raise ValueError("operator must be unary (1), binary (2), or ternary (3)")
    4988          else:
    4989              raise ValueError("operator must indicate right or left associativity")
    4990          if pa:
    4991              matchExpr.setParseAction( pa )
    4992          thisExpr <<= ( matchExpr.setName(termName) | lastExpr )
    4993          lastExpr = thisExpr
    4994      ret <<= lastExpr
    4995      return ret
    4996
    4997  operatorPrecedence = infixNotation
    4998  """(Deprecated) Former name of C{L{infixNotation}}, will be dropped in a future release."""
    4999
    5000  dblQuotedString = Combine(Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*')+'"').setName("string enclosed in double quotes")
    5001  sglQuotedString = Combine(Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*")+"'").setName("string enclosed in single quotes")
    5002  quotedString = Combine(Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*')+'"'|
    5003                         Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*")+"'").setName("quotedString using single or double quotes")
    5004  unicodeString = Combine(_L('u') + quotedString.copy()).setName("unicode string literal")
    5005
    5006 -def nestedExpr(opener="(", closer=")", content=None, ignoreExpr=quotedString.copy()):
    5007      """
    5008      Helper method for defining nested lists enclosed in opening and closing
    5009      delimiters ("(" and ")" are the default).
    5010
    5011      Parameters:
    5012       - opener - opening character for a nested list (default=C{"("}); can also be a pyparsing expression
    5013       - closer - closing character for a nested list (default=C{")"}); can also be a pyparsing expression
    5014       - content - expression for items within the nested lists (default=C{None})
    5015       - ignoreExpr - expression for ignoring opening and closing delimiters (default=C{quotedString})
    5016
    5017      If an expression is not provided for the content argument, the nested
    5018      expression will capture all whitespace-delimited content between delimiters
    5019      as a list of separate values.
    5020
    5021      Use the C{ignoreExpr} argument to define expressions that may contain
    5022      opening or closing characters that should not be treated as opening
    5023      or closing characters for nesting, such as quotedString or a comment
    5024      expression.  Specify multiple expressions using an C{L{Or}} or C{L{MatchFirst}}.
    5025      The default is L{quotedString}, but if no expressions are to be ignored,
    5026      then pass C{None} for this argument.
    5027
    5028      Example::
    5029          data_type = oneOf("void int short long char float double")
    5030          decl_data_type = Combine(data_type + Optional(Word('*')))
    5031          ident = Word(alphas+'_', alphanums+'_')
    5032          number = pyparsing_common.number
    5033          arg = Group(decl_data_type + ident)
    5034          LPAR,RPAR = map(Suppress, "()")
    5035
    5036          code_body = nestedExpr('{', '}', ignoreExpr=(quotedString | cStyleComment))
    5037
    5038          c_function = (decl_data_type("type")
    5039                        + ident("name")
    5040                        + LPAR + Optional(delimitedList(arg), [])("args") + RPAR
    5041                        + code_body("body"))
    5042          c_function.ignore(cStyleComment)
    5043
    5044          source_code = '''
    5045              int is_odd(int x) {
    5046                  return (x%2);
    5047              }
    5048
    5049              int dec_to_hex(char hchar) {
    5050                  if (hchar >= '0' && hchar <= '9') {
    5051                      return (ord(hchar)-ord('0'));
    5052                  } else {
    5053                      return (10+ord(hchar)-ord('A'));
    5054                  }
    5055              }
    5056          '''
    5057          for func in c_function.searchString(source_code):
    5058              print("%(name)s (%(type)s) args: %(args)s" % func)
    5059
    5060      prints::
    5061          is_odd (int) args: [['int', 'x']]
    5062          dec_to_hex (int) args: [['char', 'hchar']]
    5063      """
    5064      if opener == closer:
    5065          raise ValueError("opening and closing strings cannot be the same")
    5066      if content is None:
    5067          if isinstance(opener,basestring) and isinstance(closer,basestring):
    5068              if len(opener) == 1 and len(closer)==1:
    5069                  if ignoreExpr is not None:
    5070                      content = (Combine(OneOrMore(~ignoreExpr +
    5071                                      CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS,exact=1))
    5072                                  ).setParseAction(lambda t:t[0].strip()))
    5073                  else:
    5074                      content = (empty.copy()+CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS
    5075                                  ).setParseAction(lambda t:t[0].strip()))
    5076              else:
    5077                  if ignoreExpr is not None:
    5078                      content = (Combine(OneOrMore(~ignoreExpr +
    5079                                      ~Literal(opener) + ~Literal(closer) +
    5080                                      CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1))
    5081                                  ).setParseAction(lambda t:t[0].strip()))
    5082                  else:
    5083                      content = (Combine(OneOrMore(~Literal(opener) + ~Literal(closer) +
    5084                                      CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1))
    5085                                  ).setParseAction(lambda t:t[0].strip()))
    5086          else:
    5087              raise ValueError("opening and closing arguments must be strings if no content expression is given")
    5088      ret = Forward()
    5089      if ignoreExpr is not None:
    5090          ret <<= Group( Suppress(opener) + ZeroOrMore( ignoreExpr | ret | content ) + Suppress(closer) )
    5091      else:
    5092          ret <<= Group( Suppress(opener) + ZeroOrMore( ret | content )  + Suppress(closer) )
    5093      ret.setName('nested %s%s expression' % (opener,closer))
    5094      return ret
    5095
    5096 -def indentedBlock(blockStatementExpr, indentStack, indent=True):
    5097      """
    5098      Helper method for defining space-delimited indentation blocks, such as
    5099      those used to define block statements in Python source code.
    5100
    5101      Parameters:
    5102       - blockStatementExpr - expression defining syntax of statement that
    5103              is repeated within the indented block
    5104       - indentStack - list created by caller to manage indentation stack
    5105              (multiple statementWithIndentedBlock expressions within a single grammar
    5106              should share a common indentStack)
    5107       - indent - boolean indicating whether block must be indented beyond the
    5108              the current level; set to False for block of left-most statements
    5109              (default=C{True})
    5110
    5111      A valid block must contain at least one C{blockStatement}.
    5112
    5113      Example::
    5114          data = '''
    5115          def A(z):
    5116            A1
    5117            B = 100
    5118            G = A2
    5119            A2
    5120            A3
    5121          B
    5122          def BB(a,b,c):
    5123            BB1
    5124            def BBA():
    5125              bba1
    5126              bba2
    5127              bba3
    5128          C
    5129          D
    5130          def spam(x,y):
    5131               def eggs(z):
    5132                   pass
    5133          '''
    5134
    5135
    5136          indentStack = [1]
    5137          stmt = Forward()
    5138
    5139          identifier = Word(alphas, alphanums)
    5140          funcDecl = ("def" + identifier + Group( "(" + Optional( delimitedList(identifier) ) + ")" ) + ":")
    5141          func_body = indentedBlock(stmt, indentStack)
    5142          funcDef = Group( funcDecl + func_body )
    5143
    5144          rvalue = Forward()
    5145          funcCall = Group(identifier + "(" + Optional(delimitedList(rvalue)) + ")")
    5146          rvalue << (funcCall | identifier | Word(nums))
    5147          assignment = Group(identifier + "=" + rvalue)
    5148          stmt << ( funcDef | assignment | identifier )
    5149
    5150          module_body = OneOrMore(stmt)
    5151
    5152          parseTree = module_body.parseString(data)
    5153          parseTree.pprint()
    5154      prints::
    5155          [['def',
    5156            'A',
    5157            ['(', 'z', ')'],
    5158            ':',
    5159            [['A1'], [['B', '=', '100']], [['G', '=', 'A2']], ['A2'], ['A3']]],
    5160           'B',
    5161           ['def',
    5162            'BB',
    5163            ['(', 'a', 'b', 'c', ')'],
    5164            ':',
    5165            [['BB1'], [['def', 'BBA', ['(', ')'], ':', [['bba1'], ['bba2'], ['bba3']]]]]],
    5166           'C',
    5167           'D',
    5168           ['def',
    5169            'spam',
    5170            ['(', 'x', 'y', ')'],
    5171            ':',
    5172            [[['def', 'eggs', ['(', 'z', ')'], ':', [['pass']]]]]]]
    5173      """
    5174      def checkPeerIndent(s,l,t):
    5175          if l >= len(s): return
    5176          curCol = col(l,s)
    5177          if curCol != indentStack[-1]:
    5178              if curCol > indentStack[-1]:
    5179                  raise ParseFatalException(s,l,"illegal nesting")
    5180              raise ParseException(s,l,"not a peer entry")
    5181
    5182      def checkSubIndent(s,l,t):
    5183          curCol = col(l,s)
    5184          if curCol > indentStack[-1]:
    5185              indentStack.append( curCol )
    5186          else:
    5187              raise ParseException(s,l,"not a subentry")
    5188
    5189      def checkUnindent(s,l,t):
    5190          if l >= len(s): return
    5191          curCol = col(l,s)
    5192          if not(indentStack and curCol < indentStack[-1] and curCol <= indentStack[-2]):
    5193              raise ParseException(s,l,"not an unindent")
    5194          indentStack.pop()
    5195
    5196      NL = OneOrMore(LineEnd().setWhitespaceChars("\t ").suppress())
    5197      INDENT = (Empty() + Empty().setParseAction(checkSubIndent)).setName('INDENT')
    5198      PEER   = Empty().setParseAction(checkPeerIndent).setName('')
    5199      UNDENT = Empty().setParseAction(checkUnindent).setName('UNINDENT')
    5200      if indent:
    5201          smExpr = Group( Optional(NL) +
    5202              #~ FollowedBy(blockStatementExpr) +
    5203              INDENT + (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) + UNDENT)
    5204      else:
    5205          smExpr = Group( Optional(NL) +
    5206              (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) )
    5207      blockStatementExpr.ignore(_bslash + LineEnd())
    5208      return smExpr.setName('indented block')
    5209
    5210  alphas8bit = srange(r"[\0xc0-\0xd6\0xd8-\0xf6\0xf8-\0xff]")
    5211  punc8bit = srange(r"[\0xa1-\0xbf\0xd7\0xf7]")
    5212
    5213  anyOpenTag,anyCloseTag = makeHTMLTags(Word(alphas,alphanums+"_:").setName('any tag'))
    5214  _htmlEntityMap = dict(zip("gt lt amp nbsp quot apos".split(),'><& "\''))
    5215  commonHTMLEntity = Regex('&(?P<entity>' + '|'.join(_htmlEntityMap.keys()) +");").setName("common HTML entity")
    5216 -def replaceHTMLEntity(t):
    5217      """Helper parser action to replace common HTML entities with their special characters"""
    5218      return _htmlEntityMap.get(t.entity)
    5219
    5220  # it's easy to get these comment structures wrong - they're very common, so may as well make them available
    5221  cStyleComment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + '*/').setName("C style comment")
    5222  "Comment of the form C{/* ... */}"
    5223
    5224  htmlComment = Regex(r"<!--[\s\S]*?-->").setName("HTML comment")
    5225  "Comment of the form C{<!-- ... -->}"
    5226
    5227  restOfLine = Regex(r".*").leaveWhitespace().setName("rest of line")
    5228  dblSlashComment = Regex(r"//(?:\\\n|[^\n])*").setName("// comment")
    5229  "Comment of the form C{// ... (to end of line)}"
    5230
    5231  cppStyleComment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + '*/'| dblSlashComment).setName("C++ style comment")
    5232  "Comment of either form C{L{cStyleComment}} or C{L{dblSlashComment}}"
    5233
    5234  javaStyleComment = cppStyleComment
    5235  "Same as C{L{cppStyleComment}}"
    5236
    5237  pythonStyleComment = Regex(r"#.*").setName("Python style comment")
    5238  "Comment of the form C{# ... (to end of line)}"
    5239
    5240  _commasepitem = Combine(OneOrMore(Word(printables, excludeChars=',') +
    5241                                    Optional( Word(" \t") +
    5242                                              ~Literal(",") + ~LineEnd() ) ) ).streamline().setName("commaItem")
    5243  commaSeparatedList = delimitedList( Optional( quotedString.copy() | _commasepitem, default="") ).setName("commaSeparatedList")
    5244  """Predefined expression of 1 or more printable words or quoted strings, separated by commas."""
    5245
    5246  # some other useful expressions - using lower-case class name since we are really using this as a namespace
    5247 -class pyparsing_common:
    5248      """
    5249      Here are some common low-level expressions that may be useful in jump-starting parser development:
    5250       - numeric forms (L{integers<integer>}, L{reals<real>}, L{scientific notation<sciReal>})
    5251       - common L{programming identifiers<identifier>}
    5252       - network addresses (L{MAC<mac_address>}, L{IPv4<ipv4_address>}, L{IPv6<ipv6_address>})
    5253       - ISO8601 L{dates<iso8601_date>} and L{datetime<iso8601_datetime>}
    5254       - L{UUID<uuid>}
    5255      Parse actions:
    5256       - C{L{convertToInteger}}
    5257       - C{L{convertToFloat}}
    5258       - C{L{convertToDate}}
    5259       - C{L{convertToDatetime}}
    5260       - C{L{stripHTMLTags}}
    5261
    5262      Example::
    5263          pyparsing_common.number.runTests('''
    5264              # any int or real number, returned as the appropriate type
    5265              100
    5266              -100
    5267              +100
    5268              3.14159
    5269              6.02e23
    5270              1e-12
    5271              ''')
    5272
    5273          pyparsing_common.fnumber.runTests('''
    5274              # any int or real number, returned as float
    5275              100
    5276              -100
    5277              +100
    5278              3.14159
    5279              6.02e23
    5280              1e-12
    5281              ''')
    5282
    5283          pyparsing_common.hex_integer.runTests('''
    5284              # hex numbers
    5285              100
    5286              FF
    5287              ''')
    5288
    5289          pyparsing_common.fraction.runTests('''
    5290              # fractions
    5291              1/2
    5292              -3/4
    5293              ''')
    5294
    5295          pyparsing_common.mixed_integer.runTests('''
    5296              # mixed fractions
    5297              1
    5298              1/2
    5299              -3/4
    5300              1-3/4
    5301              ''')
    5302
    5303          import uuid
    5304          pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID))
    5305          pyparsing_common.uuid.runTests('''
    5306              # uuid
    5307              12345678-1234-5678-1234-567812345678
    5308              ''')
    5309      prints::
    5310          # any int or real number, returned as the appropriate type
    5311          100
    5312          [100]
    5313
    5314          -100
    5315          [-100]
    5316
    5317          +100
    5318          [100]
    5319
    5320          3.14159
    5321          [3.14159]
    5322
    5323          6.02e23
    5324          [6.02e+23]
    5325
    5326          1e-12
    5327          [1e-12]
    5328
    5329          # any int or real number, returned as float
    5330          100
    5331          [100.0]
    5332
    5333          -100
    5334          [-100.0]
    5335
    5336          +100
    5337          [100.0]
    5338
    5339          3.14159
    5340          [3.14159]
    5341
    5342          6.02e23
    5343          [6.02e+23]
    5344
    5345          1e-12
    5346          [1e-12]
    5347
    5348          # hex numbers
    5349          100
    5350          [256]
    5351
    5352          FF
    5353          [255]
    5354
    5355          # fractions
    5356          1/2
    5357          [0.5]
    5358
    5359          -3/4
    5360          [-0.75]
    5361
    5362          # mixed fractions
    5363          1
    5364          [1]
    5365
    5366          1/2
    5367          [0.5]
    5368
    5369          -3/4
    5370          [-0.75]
    5371
    5372          1-3/4
    5373          [1.75]
    5374
    5375          # uuid
    5376          12345678-1234-5678-1234-567812345678
    5377          [UUID('12345678-1234-5678-1234-567812345678')]
    5378      """
    5379
    5380      convertToInteger = tokenMap(int)
    5381      """
    5382      Parse action for converting parsed integers to Python int
    5383      """
    5384
    5385      convertToFloat = tokenMap(float)
    5386      """
    5387      Parse action for converting parsed numbers to Python float
    5388      """
    5389
    5390      integer = Word(nums).setName("integer").setParseAction(convertToInteger)
    5391      """expression that parses an unsigned integer, returns an int"""
    5392
    5393      hex_integer = Word(hexnums).setName("hex integer").setParseAction(tokenMap(int,16))
    5394      """expression that parses a hexadecimal integer, returns an int"""
    5395
    5396      signedInteger = Regex(r'[+-]?\d+').setName("signed integer").setParseAction(convertToInteger)
    5397      """expression that parses an integer with optional leading sign, returns an int"""
    5398
    5399      fraction = (signedInteger().setParseAction(convertToFloat) + '/' + signedInteger().setParseAction(convertToFloat)).setName("fraction")
    5400      """fractional expression of an integer divided by an integer, returns a float"""
    5401      fraction.addParseAction(lambda t: t[0]/t[-1])
    5402
    5403      mixed_integer = (fraction | signedInteger + Optional(Optional('-').suppress() + fraction)).setName("fraction or mixed integer-fraction")
    5404      """mixed integer of the form 'integer - fraction', with optional leading integer, returns float"""
    5405      mixed_integer.addParseAction(sum)
    5406
    5407      real = Regex(r'[+-]?\d+\.\d*').setName("real number").setParseAction(convertToFloat)
    5408      """expression that parses a floating point number and returns a float"""
    5409
    5410      sciReal = Regex(r'[+-]?\d+([eE][+-]?\d+|\.\d*([eE][+-]?\d+)?)').setName("real number with scientific notation").setParseAction(convertToFloat)
    5411      """expression that parses a floating point number with optional scientific notation and returns a float"""
    5412
    5413      # streamlining this expression makes the docs nicer-looking
    5414      number = (sciReal | real | signedInteger).streamline()
    5415      """any numeric expression, returns the corresponding Python type"""
    5416
    5417      fnumber = Regex(r'[+-]?\d+\.?\d*([eE][+-]?\d+)?').setName("fnumber").setParseAction(convertToFloat)
    5418      """any int or real number, returned as float"""
    5419
    5420      identifier = Word(alphas+'_', alphanums+'_').setName("identifier")
    5421      """typical code identifier (leading alpha or '_', followed by 0 or more alphas, nums, or '_')"""
    5422
    5423      ipv4_address = Regex(r'(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})(\.(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})){3}').setName("IPv4 address")
    5424      "IPv4 address (C{0.0.0.0 - 255.255.255.255})"
    5425
    5426      _ipv6_part = Regex(r'[0-9a-fA-F]{1,4}').setName("hex_integer")
    5427      _full_ipv6_address = (_ipv6_part + (':' + _ipv6_part)*7).setName("full IPv6 address")
    5428      _short_ipv6_address = (Optional(_ipv6_part + (':' + _ipv6_part)*(0,6)) + "::" + Optional(_ipv6_part + (':' + _ipv6_part)*(0,6))).setName("short IPv6 address")
    5429      _short_ipv6_address.addCondition(lambda t: sum(1 for tt in t if pyparsing_common._ipv6_part.matches(tt)) < 8)
    5430      _mixed_ipv6_address = ("::ffff:" + ipv4_address).setName("mixed IPv6 address")
    5431      ipv6_address = Combine((_full_ipv6_address | _mixed_ipv6_address | _short_ipv6_address).setName("IPv6 address")).setName("IPv6 address")
    5432      "IPv6 address (long, short, or mixed form)"
    5433
    5434      mac_address = Regex(r'[0-9a-fA-F]{2}([:.-])[0-9a-fA-F]{2}(?:\1[0-9a-fA-F]{2}){4}').setName("MAC address")
    5435      "MAC address xx:xx:xx:xx:xx (may also have '-' or '.' delimiters)"
    5436
    5437      @staticmethod
    5438 -    def convertToDate(fmt="%Y-%m-%d"):
    5439          """
    5440          Helper to create a parse action for converting parsed date string to Python datetime.date
    5441
    5442          Params -
    5443           - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%d"})
    5444
    5445          Example::
    5446              date_expr = pyparsing_common.iso8601_date.copy()
    5447              date_expr.setParseAction(pyparsing_common.convertToDate())
    5448              print(date_expr.parseString("1999-12-31"))
    5449          prints::
    5450              [datetime.date(1999, 12, 31)]
    5451          """
    5452          def cvt_fn(s,l,t):
    5453              try:
    5454                  return datetime.strptime(t[0], fmt).date()
    5455              except ValueError as ve:
    5456                  raise ParseException(s, l, str(ve))
    5457          return cvt_fn
    5458
    5459      @staticmethod
    5460 -    def convertToDatetime(fmt="%Y-%m-%dT%H:%M:%S.%f"):
    5461          """
    5462          Helper to create a parse action for converting parsed datetime string to Python datetime.datetime
    5463
    5464          Params -
    5465           - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%dT%H:%M:%S.%f"})
    5466
    5467          Example::
    5468              dt_expr = pyparsing_common.iso8601_datetime.copy()
    5469              dt_expr.setParseAction(pyparsing_common.convertToDatetime())
    5470              print(dt_expr.parseString("1999-12-31T23:59:59.999"))
    5471          prints::
    5472              [datetime.datetime(1999, 12, 31, 23, 59, 59, 999000)]
    5473          """
    5474          def cvt_fn(s,l,t):
    5475              try:
    5476                  return datetime.strptime(t[0], fmt)
    5477              except ValueError as ve:
    5478                  raise ParseException(s, l, str(ve))
    5479          return cvt_fn
    5480
    5481      iso8601_date = Regex(r'(?P<year>\d{4})(?:-(?P<month>\d\d)(?:-(?P<day>\d\d))?)?').setName("ISO8601 date")
    5482      "ISO8601 date (C{yyyy-mm-dd})"
    5483
    5484      iso8601_datetime = Regex(r'(?P<year>\d{4})-(?P<month>\d\d)-(?P<day>\d\d)[T ](?P<hour>\d\d):(?P<minute>\d\d)(:(?P<second>\d\d(\.\d*)?)?)?(?P<tz>Z|[+-]\d\d:?\d\d)?').setName("ISO8601 datetime")
    5485      "ISO8601 datetime (C{yyyy-mm-ddThh:mm:ss.s(Z|+-00:00)}) - trailing seconds, milliseconds, and timezone optional; accepts separating C{'T'} or C{' '}"
    5486
    5487      uuid = Regex(r'[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}').setName("UUID")
    5488      "UUID (C{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx})"
    5489
    5490      _html_stripper = anyOpenTag.suppress() | anyCloseTag.suppress()
    5491      @staticmethod
    5492 -    def stripHTMLTags(s, l, tokens):
    5493          """
    5494          Parse action to remove HTML tags from web page HTML source
    5495
    5496          Example::
    5497              # strip HTML links from normal text
    5498              text = '<td>More info at the <a href="http://pyparsing.wikispaces.com">pyparsing</a> wiki page</td>'
    5499              td,td_end = makeHTMLTags("TD")
    5500              table_text = td + SkipTo(td_end).setParseAction(pyparsing_common.stripHTMLTags)("body") + td_end
    5501
    5502              print(table_text.parseString(text).body) # -> 'More info at the pyparsing wiki page'
    5503          """
    5504          return pyparsing_common._html_stripper.transformString(tokens[0])
    5505
    5506  if __name__ == "__main__":
    5507
    5508      selectToken    = CaselessLiteral("select")
    5509      fromToken      = CaselessLiteral("from")
    5510
    5511      ident          = Word(alphas, alphanums + "_$")
    5512
    5513      columnName     = delimitedList(ident, ".", combine=True).setParseAction(upcaseTokens)
    5514      columnNameList = Group(delimitedList(columnName)).setName("columns")
    5515      columnSpec     = ('*' | columnNameList)
    5516
    5517      tableName      = delimitedList(ident, ".", combine=True).setParseAction(upcaseTokens)
    5518      tableNameList  = Group(delimitedList(tableName)).setName("tables")
    5519
    5520      simpleSQL      = selectToken("command") + columnSpec("columns") + fromToken + tableNameList("tables")
    5521
    5522      # demo runTests method, including embedded comments in test string
    5523      simpleSQL.runTests("""
    5524          # '*' as column list and dotted table name
    5525          select * from SYS.XYZZY
    5526
    5527          # caseless match on "SELECT", and casts back to "select"
    5528          SELECT * from XYZZY, ABC
    5529
    5530          # list of column names, and mixed case SELECT keyword
    5531          Select AA,BB,CC from Sys.dual
    5532
    5533          # multiple tables
    5534          Select A, B, C from Sys.dual, Table2
    5535
    5536          # invalid SELECT keyword - should fail
    5537          Xelect A, B, C from Sys.dual
    5538
    5539          # incomplete command - should fail
    5540          Select
    5541
    5542          # invalid column name - should fail
    5543          Select ^^^ frox Sys.dual
    5544
    5545          """)
    5546
    5547      pyparsing_common.number.runTests("""
    5548          100
    5549          -100
    5550          +100
    5551          3.14159
    5552          6.02e23
    5553          1e-12
    5554          """)
    5555
    5556      # any int or real number, returned as float
    5557      pyparsing_common.fnumber.runTests("""
    5558          100
    5559          -100
    5560          +100
    5561          3.14159
    5562          6.02e23
    5563          1e-12
    5564          """)
    5565
    5566      pyparsing_common.hex_integer.runTests("""
    5567          100
    5568          FF
    5569          """)
    5570
    5571      import uuid
    5572      pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID))
    5573      pyparsing_common.uuid.runTests("""
    5574          12345678-1234-5678-1234-567812345678
    5575          """)
    5576