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 C{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__ = "2.1.0"
      61  __versionTime__ = "7 Feb 2016 14:09"
      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 functools
      74  import itertools
      75  import traceback
      76
      77  #~ sys.stderr.write( "testing pyparsing module, version %s, %s\n" % (__version__,__versionTime__ ) )
      78
      79  __all__ = [
      80  'And', 'CaselessKeyword', 'CaselessLiteral', 'CharsNotIn', 'Combine', 'Dict', 'Each', 'Empty',
      81  'FollowedBy', 'Forward', 'GoToColumn', 'Group', 'Keyword', 'LineEnd', 'LineStart', 'Literal',
      82  'MatchFirst', 'NoMatch', 'NotAny', 'OneOrMore', 'OnlyOnce', 'Optional', 'Or',
      83  'ParseBaseException', 'ParseElementEnhance', 'ParseException', 'ParseExpression', 'ParseFatalException',
      84  'ParseResults', 'ParseSyntaxException', 'ParserElement', 'QuotedString', 'RecursiveGrammarException',
      85  'Regex', 'SkipTo', 'StringEnd', 'StringStart', 'Suppress', 'Token', 'TokenConverter',
      86  'White', 'Word', 'WordEnd', 'WordStart', 'ZeroOrMore',
      87  'alphanums', 'alphas', 'alphas8bit', 'anyCloseTag', 'anyOpenTag', 'cStyleComment', 'col',
      88  'commaSeparatedList', 'commonHTMLEntity', 'countedArray', 'cppStyleComment', 'dblQuotedString',
      89  'dblSlashComment', 'delimitedList', 'dictOf', 'downcaseTokens', 'empty', 'hexnums',
      90  'htmlComment', 'javaStyleComment', 'line', 'lineEnd', 'lineStart', 'lineno',
      91  'makeHTMLTags', 'makeXMLTags', 'matchOnlyAtCol', 'matchPreviousExpr', 'matchPreviousLiteral',
      92  'nestedExpr', 'nullDebugAction', 'nums', 'oneOf', 'opAssoc', 'operatorPrecedence', 'printables',
      93  'punc8bit', 'pythonStyleComment', 'quotedString', 'removeQuotes', 'replaceHTMLEntity',
      94  'replaceWith', 'restOfLine', 'sglQuotedString', 'srange', 'stringEnd',
      95  'stringStart', 'traceParseAction', 'unicodeString', 'upcaseTokens', 'withAttribute',
      96  'indentedBlock', 'originalTextFor', 'ungroup', 'infixNotation','locatedExpr', 'withClass',
      97  ]
      98
      99  PY_3 = sys.version.startswith('3')
     100  if PY_3:
     101      _MAX_INT = sys.maxsize
     102      basestring = str
     103      unichr = chr
     104      _ustr = str
     105
     106      # build list of single arg builtins, that can be used as parse actions
     107      singleArgBuiltins = [sum, len, sorted, reversed, list, tuple, set, any, all, min, max]
     108
     109  else:
     110      _MAX_INT = sys.maxint
     111      range = xrange
     112
     113 -    def _ustr(obj):
     114          """Drop-in replacement for str(obj) that tries to be Unicode friendly. It first tries
     115             str(obj). If that fails with a UnicodeEncodeError, then it tries unicode(obj). It
     116             then < returns the unicode object | encodes it with the default encoding | ... >.
     117          """
     118          if isinstance(obj,unicode):
     119              return obj
     120
     121          try:
     122              # If this works, then _ustr(obj) has the same behaviour as str(obj), so
     123              # it won't break any existing code.
     124              return str(obj)
     125
     126          except UnicodeEncodeError:
     127              # Else encode it
     128              ret = unicode(obj).encode(sys.getdefaultencoding(), 'xmlcharrefreplace')
     129              xmlcharref = Regex('&#\d+;')
     130              xmlcharref.setParseAction(lambda t: '\\u' + hex(int(t[0][2:-1]))[2:])
     131              return xmlcharref.transformString(ret)
     132
     133      # build list of single arg builtins, tolerant of Python version, that can be used as parse actions
     134      singleArgBuiltins = []
     135      import __builtin__
     136      for fname in "sum len sorted reversed list tuple set any all min max".split():
     137          try:
     138              singleArgBuiltins.append(getattr(__builtin__,fname))
     139          except AttributeError:
     140              continue
     141
     142  _generatorType = type((y for y in range(1)))
     143
     144 -def _xml_escape(data):
     145      """Escape &, <, >, ", ', etc. in a string of data."""
     146
     147      # ampersand must be replaced first
     148      from_symbols = '&><"\''
     149      to_symbols = ('&'+s+';' for s in "amp gt lt quot apos".split())
     150      for from_,to_ in zip(from_symbols, to_symbols):
     151          data = data.replace(from_, to_)
     152      return data
     153
     154 -class _Constants(object):
     155      pass
     156
     157  alphas     = string.ascii_uppercase + string.ascii_lowercase
     158  nums       = "0123456789"
     159  hexnums    = nums + "ABCDEFabcdef"
     160  alphanums  = alphas + nums
     161  _bslash    = chr(92)
     162  printables = "".join(c for c in string.printable if c not in string.whitespace)
     163
     164 -class ParseBaseException(Exception):
     165      """base exception class for all parsing runtime exceptions"""
     166      # Performance tuning: we construct a *lot* of these, so keep this
     167      # constructor as small and fast as possible
     168 -    def __init__( self, pstr, loc=0, msg=None, elem=None ):
     169          self.loc = loc
     170          if msg is None:
     171              self.msg = pstr
     172              self.pstr = ""
     173          else:
     174              self.msg = msg
     175              self.pstr = pstr
     176          self.parserElement = elem
     177
     178 -    def __getattr__( self, aname ):
     179          """supported attributes by name are:
     180              - lineno - returns the line number of the exception text
     181              - col - returns the column number of the exception text
     182              - line - returns the line containing the exception text
     183          """
     184          if( aname == "lineno" ):
     185              return lineno( self.loc, self.pstr )
     186          elif( aname in ("col", "column") ):
     187              return col( self.loc, self.pstr )
     188          elif( aname == "line" ):
     189              return line( self.loc, self.pstr )
     190          else:
     191              raise AttributeError(aname)
     192
     193 -    def __str__( self ):
     194          return "%s (at char %d), (line:%d, col:%d)" % \
     195                  ( self.msg, self.loc, self.lineno, self.column )
     196 -    def __repr__( self ):
     197          return _ustr(self)
     198 -    def markInputline( self, markerString = ">!<" ):
     199          """Extracts the exception line from the input string, and marks
     200             the location of the exception with a special symbol.
     201          """
     202          line_str = self.line
     203          line_column = self.column - 1
     204          if markerString:
     205              line_str = "".join((line_str[:line_column],
     206                                  markerString, line_str[line_column:]))
     207          return line_str.strip()
     208 -    def __dir__(self):
     209          return "lineno col line".split() + dir(type(self))
     210
     211 -class ParseException(ParseBaseException):
     212      """exception thrown when parse expressions don't match class;
     213         supported attributes by name are:
     214          - lineno - returns the line number of the exception text
     215          - col - returns the column number of the exception text
     216          - line - returns the line containing the exception text
     217      """
     218      pass
     219
     220 -class ParseFatalException(ParseBaseException):
     221      """user-throwable exception thrown when inconsistent parse content
     222         is found; stops all parsing immediately"""
     223      pass
     224
     225 -class ParseSyntaxException(ParseFatalException):
     226      """just like C{L{ParseFatalException}}, but thrown internally when an
     227         C{L{ErrorStop<And._ErrorStop>}} ('-' operator) indicates that parsing is to stop immediately because
     228         an unbacktrackable syntax error has been found"""
     229 -    def __init__(self, pe):
     230          super(ParseSyntaxException, self).__init__(
     231                                      pe.pstr, pe.loc, pe.msg, pe.parserElement)
     232
     233  #~ class ReparseException(ParseBaseException):
     234      #~ """Experimental class - parse actions can raise this exception to cause
     235         #~ pyparsing to reparse the input string:
     236          #~ - with a modified input string, and/or
     237          #~ - with a modified start location
     238         #~ Set the values of the ReparseException in the constructor, and raise the
     239         #~ exception in a parse action to cause pyparsing to use the new string/location.
     240         #~ Setting the values as None causes no change to be made.
     241         #~ """
     242      #~ def __init_( self, newstring, restartLoc ):
     243          #~ self.newParseText = newstring
     244          #~ self.reparseLoc = restartLoc
     245
     246 -class RecursiveGrammarException(Exception):
     247      """exception thrown by C{validate()} if the grammar could be improperly recursive"""
     248 -    def __init__( self, parseElementList ):
     249          self.parseElementTrace = parseElementList
     250
     251 -    def __str__( self ):
     252          return "RecursiveGrammarException: %s" % self.parseElementTrace
     253
     254 -class _ParseResultsWithOffset(object):
     255 -    def __init__(self,p1,p2):
     256          self.tup = (p1,p2)
     257 -    def __getitem__(self,i):
     258          return self.tup[i]
     259 -    def __repr__(self):
     260          return repr(self.tup)
     261 -    def setOffset(self,i):
     262          self.tup = (self.tup[0],i)
     263
     264 -class ParseResults(object):
     265      """Structured parse results, to provide multiple means of access to the parsed data:
     266         - as a list (C{len(results)})
     267         - by list index (C{results[0], results[1]}, etc.)
     268         - by attribute (C{results.<resultsName>})
     269         """
     270 -    def __new__(cls, toklist=None, name=None, asList=True, modal=True ):
     271          if isinstance(toklist, cls):
     272              return toklist
     273          retobj = object.__new__(cls)
     274          retobj.__doinit = True
     275          return retobj
     276
     277      # Performance tuning: we construct a *lot* of these, so keep this
     278      # constructor as small and fast as possible
     279 -    def __init__( self, toklist=None, name=None, asList=True, modal=True, isinstance=isinstance ):
     280          if self.__doinit:
     281              self.__doinit = False
     282              self.__name = None
     283              self.__parent = None
     284              self.__accumNames = {}
     285              self.__asList = asList
     286              self.__modal = modal
     287              if toklist is None:
     288                  toklist = []
     289              if isinstance(toklist, list):
     290                  self.__toklist = toklist[:]
     291              elif isinstance(toklist, _generatorType):
     292                  self.__toklist = list(toklist)
     293              else:
     294                  self.__toklist = [toklist]
     295              self.__tokdict = dict()
     296
     297          if name is not None and name:
     298              if not modal:
     299                  self.__accumNames[name] = 0
     300              if isinstance(name,int):
     301                  name = _ustr(name) # will always return a str, but use _ustr for consistency
     302              self.__name = name
     303              if not (isinstance(toklist, (type(None), basestring, list)) and toklist in (None,'',[])):
     304                  if isinstance(toklist,basestring):
     305                      toklist = [ toklist ]
     306                  if asList:
     307                      if isinstance(toklist,ParseResults):
     308                          self[name] = _ParseResultsWithOffset(toklist.copy(),0)
     309                      else:
     310                          self[name] = _ParseResultsWithOffset(ParseResults(toklist[0]),0)
     311                      self[name].__name = name
     312                  else:
     313                      try:
     314                          self[name] = toklist[0]
     315                      except (KeyError,TypeError,IndexError):
     316                          self[name] = toklist
     317
     318 -    def __getitem__( self, i ):
     319          if isinstance( i, (int,slice) ):
     320              return self.__toklist[i]
     321          else:
     322              if i not in self.__accumNames:
     323                  return self.__tokdict[i][-1][0]
     324              else:
     325                  return ParseResults([ v[0] for v in self.__tokdict[i] ])
     326
     327 -    def __setitem__( self, k, v, isinstance=isinstance ):
     328          if isinstance(v,_ParseResultsWithOffset):
     329              self.__tokdict[k] = self.__tokdict.get(k,list()) + [v]
     330              sub = v[0]
     331          elif isinstance(k,int):
     332              self.__toklist[k] = v
     333              sub = v
     334          else:
     335              self.__tokdict[k] = self.__tokdict.get(k,list()) + [_ParseResultsWithOffset(v,0)]
     336              sub = v
     337          if isinstance(sub,ParseResults):
     338              sub.__parent = wkref(self)
     339
     340 -    def __delitem__( self, i ):
     341          if isinstance(i,(int,slice)):
     342              mylen = len( self.__toklist )
     343              del self.__toklist[i]
     344
     345              # convert int to slice
     346              if isinstance(i, int):
     347                  if i < 0:
     348                      i += mylen
     349                  i = slice(i, i+1)
     350              # get removed indices
     351              removed = list(range(*i.indices(mylen)))
     352              removed.reverse()
     353              # fixup indices in token dictionary
     354              #~ for name in self.__tokdict:
     355                  #~ occurrences = self.__tokdict[name]
     356                  #~ for j in removed:
     357                      #~ for k, (value, position) in enumerate(occurrences):
     358                          #~ occurrences[k] = _ParseResultsWithOffset(value, position - (position > j))
     359              for name,occurrences in self.__tokdict.items():
     360                  for j in removed:
     361                      for k, (value, position) in enumerate(occurrences):
     362                          occurrences[k] = _ParseResultsWithOffset(value, position - (position > j))
     363          else:
     364              del self.__tokdict[i]
     365
     366 -    def __contains__( self, k ):
     367          return k in self.__tokdict
     368
     369 -    def __len__( self ): return len( self.__toklist )
     370 -    def __bool__(self): return ( not not self.__toklist )
     371      __nonzero__ = __bool__
     372 -    def __iter__( self ): return iter( self.__toklist )
     373 -    def __reversed__( self ): return iter( self.__toklist[::-1] )
     374 -    def iterkeys( self ):
     375          """Returns all named result keys."""
     376          if hasattr(self.__tokdict, "iterkeys"):
     377              return self.__tokdict.iterkeys()
     378          else:
     379              return iter(self.__tokdict)
     380
     381 -    def itervalues( self ):
     382          """Returns all named result values."""
     383          return (self[k] for k in self.iterkeys())
     384
     385 -    def iteritems( self ):
     386          return ((k, self[k]) for k in self.iterkeys())
     387
     388      if PY_3:
     389          keys = iterkeys
     390          values = itervalues
     391          items = iteritems
     392      else:
     393 -        def keys( self ):
     394              """Returns all named result keys."""
     395              return list(self.iterkeys())
     396
     397 -        def values( self ):
     398              """Returns all named result values."""
     399              return list(self.itervalues())
     400
     401 -        def items( self ):
     402              """Returns all named result keys and values as a list of tuples."""
     403              return list(self.iteritems())
     404
     405 -    def haskeys( self ):
     406          """Since keys() returns an iterator, this method is helpful in bypassing
     407             code that looks for the existence of any defined results names."""
     408          return bool(self.__tokdict)
     409
     410 -    def pop( self, *args, **kwargs):
     411          """Removes and returns item at specified index (default=last).
     412             Supports both list and dict semantics for pop(). If passed no
     413             argument or an integer argument, it will use list semantics
     414             and pop tokens from the list of parsed tokens. If passed a
     415             non-integer argument (most likely a string), it will use dict
     416             semantics and pop the corresponding value from any defined
     417             results names. A second default return value argument is
     418             supported, just as in dict.pop()."""
     419          if not args:
     420              args = [-1]
     421          for k,v in kwargs.items():
     422              if k == 'default':
     423                  args = (args[0], v)
     424              else:
     425                  raise TypeError("pop() got an unexpected keyword argument '%s'" % k)
     426          if (isinstance(args[0], int) or
     427                          len(args) == 1 or
     428                          args[0] in self):
     429              index = args[0]
     430              ret = self[index]
     431              del self[index]
     432              return ret
     433          else:
     434              defaultvalue = args[1]
     435              return defaultvalue
     436
     437 -    def get(self, key, defaultValue=None):
     438          """Returns named result matching the given key, or if there is no
     439             such name, then returns the given C{defaultValue} or C{None} if no
     440             C{defaultValue} is specified."""
     441          if key in self:
     442              return self[key]
     443          else:
     444              return defaultValue
     445
     446 -    def insert( self, index, insStr ):
     447          """Inserts new element at location index in the list of parsed tokens."""
     448          self.__toklist.insert(index, insStr)
     449          # fixup indices in token dictionary
     450          #~ for name in self.__tokdict:
     451              #~ occurrences = self.__tokdict[name]
     452              #~ for k, (value, position) in enumerate(occurrences):
     453                  #~ occurrences[k] = _ParseResultsWithOffset(value, position + (position > index))
     454          for name,occurrences in self.__tokdict.items():
     455              for k, (value, position) in enumerate(occurrences):
     456                  occurrences[k] = _ParseResultsWithOffset(value, position + (position > index))
     457
     458 -    def append( self, item ):
     459          """Add single element to end of ParseResults list of elements."""
     460          self.__toklist.append(item)
     461
     462 -    def extend( self, itemseq ):
     463          """Add sequence of elements to end of ParseResults list of elements."""
     464          if isinstance(itemseq, ParseResults):
     465              self += itemseq
     466          else:
     467              self.__toklist.extend(itemseq)
     468
     469 -    def clear( self ):
     470          """Clear all elements and results names."""
     471          del self.__toklist[:]
     472          self.__tokdict.clear()
     473
     474 -    def __getattr__( self, name ):
     475          try:
     476              return self[name]
     477          except KeyError:
     478              return ""
     479
     480          if name in self.__tokdict:
     481              if name not in self.__accumNames:
     482                  return self.__tokdict[name][-1][0]
     483              else:
     484                  return ParseResults([ v[0] for v in self.__tokdict[name] ])
     485          else:
     486              return ""
     487
     488 -    def __add__( self, other ):
     489          ret = self.copy()
     490          ret += other
     491          return ret
     492
     493 -    def __iadd__( self, other ):
     494          if other.__tokdict:
     495              offset = len(self.__toklist)
     496              addoffset = lambda a: offset if a<0 else a+offset
     497              otheritems = other.__tokdict.items()
     498              otherdictitems = [(k, _ParseResultsWithOffset(v[0],addoffset(v[1])) )
     499                                  for (k,vlist) in otheritems for v in vlist]
     500              for k,v in otherdictitems:
     501                  self[k] = v
     502                  if isinstance(v[0],ParseResults):
     503                      v[0].__parent = wkref(self)
     504
     505          self.__toklist += other.__toklist
     506          self.__accumNames.update( other.__accumNames )
     507          return self
     508
     509 -    def __radd__(self, other):
     510          if isinstance(other,int) and other == 0:
     511              # useful for merging many ParseResults using sum() builtin
     512              return self.copy()
     513          else:
     514              # this may raise a TypeError - so be it
     515              return other + self
     516
     517 -    def __repr__( self ):
     518          return "(%s, %s)" % ( repr( self.__toklist ), repr( self.__tokdict ) )
     519
     520 -    def __str__( self ):
     521          return '[' + ', '.join(_ustr(i) if isinstance(i, ParseResults) else repr(i) for i in self.__toklist) + ']'
     522
     523 -    def _asStringList( self, sep='' ):
     524          out = []
     525          for item in self.__toklist:
     526              if out and sep:
     527                  out.append(sep)
     528              if isinstance( item, ParseResults ):
     529                  out += item._asStringList()
     530              else:
     531                  out.append( _ustr(item) )
     532          return out
     533
     534 -    def asList( self ):
     535          """Returns the parse results as a nested list of matching tokens, all converted to strings."""
     536          return [res.asList() if isinstance(res,ParseResults) else res for res in self.__toklist]
     537
     538 -    def asDict( self ):
     539          """Returns the named parse results as a nested dictionary."""
     540          if PY_3:
     541              item_fn = self.items
     542          else:
     543              item_fn = self.iteritems
     544          return dict((k,v.asDict()) if isinstance(v, ParseResults) else (k,v) for k,v in item_fn())
     545
     546 -    def copy( self ):
     547          """Returns a new copy of a C{ParseResults} object."""
     548          ret = ParseResults( self.__toklist )
     549          ret.__tokdict = self.__tokdict.copy()
     550          ret.__parent = self.__parent
     551          ret.__accumNames.update( self.__accumNames )
     552          ret.__name = self.__name
     553          return ret
     554
     555 -    def asXML( self, doctag=None, namedItemsOnly=False, indent="", formatted=True ):
     556          """Returns the parse results as XML. Tags are created for tokens and lists that have defined results names."""
     557          nl = "\n"
     558          out = []
     559          namedItems = dict((v[1],k) for (k,vlist) in self.__tokdict.items()
     560                                                              for v in vlist)
     561          nextLevelIndent = indent + "  "
     562
     563          # collapse out indents if formatting is not desired
     564          if not formatted:
     565              indent = ""
     566              nextLevelIndent = ""
     567              nl = ""
     568
     569          selfTag = None
     570          if doctag is not None:
     571              selfTag = doctag
     572          else:
     573              if self.__name:
     574                  selfTag = self.__name
     575
     576          if not selfTag:
     577              if namedItemsOnly:
     578                  return ""
     579              else:
     580                  selfTag = "ITEM"
     581
     582          out += [ nl, indent, "<", selfTag, ">" ]
     583
     584          for i,res in enumerate(self.__toklist):
     585              if isinstance(res,ParseResults):
     586                  if i in namedItems:
     587                      out += [ res.asXML(namedItems[i],
     588                                          namedItemsOnly and doctag is None,
     589                                          nextLevelIndent,
     590                                          formatted)]
     591                  else:
     592                      out += [ res.asXML(None,
     593                                          namedItemsOnly and doctag is None,
     594                                          nextLevelIndent,
     595                                          formatted)]
     596              else:
     597                  # individual token, see if there is a name for it
     598                  resTag = None
     599                  if i in namedItems:
     600                      resTag = namedItems[i]
     601                  if not resTag:
     602                      if namedItemsOnly:
     603                          continue
     604                      else:
     605                          resTag = "ITEM"
     606                  xmlBodyText = _xml_escape(_ustr(res))
     607                  out += [ nl, nextLevelIndent, "<", resTag, ">",
     608                                                  xmlBodyText,
     609                                                  "</", resTag, ">" ]
     610
     611          out += [ nl, indent, "</", selfTag, ">" ]
     612          return "".join(out)
     613
     614 -    def __lookup(self,sub):
     615          for k,vlist in self.__tokdict.items():
     616              for v,loc in vlist:
     617                  if sub is v:
     618                      return k
     619          return None
     620
     621 -    def getName(self):
     622          """Returns the results name for this token expression."""
     623          if self.__name:
     624              return self.__name
     625          elif self.__parent:
     626              par = self.__parent()
     627              if par:
     628                  return par.__lookup(self)
     629              else:
     630                  return None
     631          elif (len(self) == 1 and
     632                 len(self.__tokdict) == 1 and
     633                 self.__tokdict.values()[0][0][1] in (0,-1)):
     634              return self.__tokdict.keys()[0]
     635          else:
     636              return None
     637
     638 -    def dump(self,indent='',depth=0):
     639          """Diagnostic method for listing out the contents of a C{ParseResults}.
     640             Accepts an optional C{indent} argument so that this string can be embedded
     641             in a nested display of other data."""
     642          out = []
     643          NL = '\n'
     644          out.append( indent+_ustr(self.asList()) )
     645          if self.haskeys():
     646              items = sorted(self.items())
     647              for k,v in items:
     648                  if out:
     649                      out.append(NL)
     650                  out.append( "%s%s- %s: " % (indent,('  '*depth), k) )
     651                  if isinstance(v,ParseResults):
     652                      if v:
     653                          out.append( v.dump(indent,depth+1) )
     654                      else:
     655                          out.append(_ustr(v))
     656                  else:
     657                      out.append(_ustr(v))
     658          elif any(isinstance(vv,ParseResults) for vv in self):
     659              v = self
     660              for i,vv in enumerate(v):
     661                  if isinstance(vv,ParseResults):
     662                      out.append("\n%s%s[%d]:\n%s%s%s" % (indent,('  '*(depth)),i,indent,('  '*(depth+1)),vv.dump(indent,depth+1) ))
     663                  else:
     664                      out.append("\n%s%s[%d]:\n%s%s%s" % (indent,('  '*(depth)),i,indent,('  '*(depth+1)),_ustr(vv)))
     665
     666          return "".join(out)
     667
     668 -    def pprint(self, *args, **kwargs):
     669          """Pretty-printer for parsed results as a list, using the C{pprint} module.
     670             Accepts additional positional or keyword args as defined for the
     671             C{pprint.pprint} method. (U{http://docs.python.org/3/library/pprint.html#pprint.pprint})"""
     672          pprint.pprint(self.asList(), *args, **kwargs)
     673
     674      # add support for pickle protocol
     675 -    def __getstate__(self):
     676          return ( self.__toklist,
     677                   ( self.__tokdict.copy(),
     678                     self.__parent is not None and self.__parent() or None,
     679                     self.__accumNames,
     680                     self.__name ) )
     681
     682 -    def __setstate__(self,state):
     683          self.__toklist = state[0]
     684          (self.__tokdict,
     685           par,
     686           inAccumNames,
     687           self.__name) = state[1]
     688          self.__accumNames = {}
     689          self.__accumNames.update(inAccumNames)
     690          if par is not None:
     691              self.__parent = wkref(par)
     692          else:
     693              self.__parent = None
     694
     695 -    def __getnewargs__(self):
     696          return self.__toklist, self.__name, self.__asList, self.__modal
     697
     698 -    def __dir__(self):
     699          return (dir(type(self)) + list(self.keys()))
     700
     701  collections.MutableMapping.register(ParseResults)
     702
     703 -def col (loc,strg):
     704      """Returns current column within a string, counting newlines as line separators.
     705     The first column is number 1.
     706
     707     Note: the default parsing behavior is to expand tabs in the input string
     708     before starting the parsing process.  See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information
     709     on parsing strings containing C{<TAB>}s, and suggested methods to maintain a
     710     consistent view of the parsed string, the parse location, and line and column
     711     positions within the parsed string.
     712     """
     713      s = strg
     714      return 1 if loc<len(s) and s[loc] == '\n' else loc - s.rfind("\n", 0, loc)
     715
     716 -def lineno(loc,strg):
     717      """Returns current line number within a string, counting newlines as line separators.
     718     The first line is number 1.
     719
     720     Note: the default parsing behavior is to expand tabs in the input string
     721     before starting the parsing process.  See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information
     722     on parsing strings containing C{<TAB>}s, and suggested methods to maintain a
     723     consistent view of the parsed string, the parse location, and line and column
     724     positions within the parsed string.
     725     """
     726      return strg.count("\n",0,loc) + 1
     727
     728 -def line( loc, strg ):
     729      """Returns the line of text containing loc within a string, counting newlines as line separators.
     730         """
     731      lastCR = strg.rfind("\n", 0, loc)
     732      nextCR = strg.find("\n", loc)
     733      if nextCR >= 0:
     734          return strg[lastCR+1:nextCR]
     735      else:
     736          return strg[lastCR+1:]
     737
     738 -def _defaultStartDebugAction( instring, loc, expr ):
     739      print (("Match " + _ustr(expr) + " at loc " + _ustr(loc) + "(%d,%d)" % ( lineno(loc,instring), col(loc,instring) )))
     740
     741 -def _defaultSuccessDebugAction( instring, startloc, endloc, expr, toks ):
     742      print ("Matched " + _ustr(expr) + " -> " + str(toks.asList()))
     743
     744 -def _defaultExceptionDebugAction( instring, loc, expr, exc ):
     745      print ("Exception raised:" + _ustr(exc))
     746
     747 -def nullDebugAction(*args):
     748      """'Do-nothing' debug action, to suppress debugging output during parsing."""
     749      pass
     750
     751  # Only works on Python 3.x - nonlocal is toxic to Python 2 installs
     752  #~ 'decorator to trim function calls to match the arity of the target'
     753  #~ def _trim_arity(func, maxargs=3):
     754      #~ if func in singleArgBuiltins:
     755          #~ return lambda s,l,t: func(t)
     756      #~ limit = 0
     757      #~ foundArity = False
     758      #~ def wrapper(*args):
     759          #~ nonlocal limit,foundArity
     760          #~ while 1:
     761              #~ try:
     762                  #~ ret = func(*args[limit:])
     763                  #~ foundArity = True
     764                  #~ return ret
     765              #~ except TypeError:
     766                  #~ if limit == maxargs or foundArity:
     767                      #~ raise
     768                  #~ limit += 1
     769                  #~ continue
     770      #~ return wrapper
     771
     772  # this version is Python 2.x-3.x cross-compatible
     773  'decorator to trim function calls to match the arity of the target'
     774 -def _trim_arity(func, maxargs=2):
     775      if func in singleArgBuiltins:
     776          return lambda s,l,t: func(t)
     777      limit = [0]
     778      foundArity = [False]
     779      def wrapper(*args):
     780          while 1:
     781              try:
     782                  ret = func(*args[limit[0]:]) #~@$^*)+_(&%#!=-`~;:"[]{}
     783                  foundArity[0] = True
     784                  return ret
     785              except TypeError:
     786                  # re-raise TypeErrors if they did not come from our arity testing
     787                  if foundArity[0]:
     788                      raise
     789                  else:
     790                      try:
     791                          tb = sys.exc_info()[-1]
     792                          exc_source_line = traceback.extract_tb(tb)[-1][-1]
     793                          if not exc_source_line.endswith('#~@$^*)+_(&%#!=-`~;:"[]{}'):
     794                              raise
     795                      finally:
     796                          del tb
     797
     798                  if limit[0] <= maxargs:
     799                      limit[0] += 1
     800                      continue
     801                  raise
     802      return wrapper
     803
     804 -class ParserElement(object):
     805      """Abstract base level parser element class."""
     806      DEFAULT_WHITE_CHARS = " \n\t\r"
     807      verbose_stacktrace = False
     808
     809      @staticmethod
     810 -    def setDefaultWhitespaceChars( chars ):
     811          """Overrides the default whitespace chars
     812          """
     813          ParserElement.DEFAULT_WHITE_CHARS = chars
     814
     815      @staticmethod
     816 -    def inlineLiteralsUsing(cls):
     817          """
     818          Set class to be used for inclusion of string literals into a parser.
     819          """
     820          ParserElement.literalStringClass = cls
     821
     822 -    def __init__( self, savelist=False ):
     823          self.parseAction = list()
     824          self.failAction = None
     825          #~ self.name = "<unknown>"  # don't define self.name, let subclasses try/except upcall
     826          self.strRepr = None
     827          self.resultsName = None
     828          self.saveAsList = savelist
     829          self.skipWhitespace = True
     830          self.whiteChars = ParserElement.DEFAULT_WHITE_CHARS
     831          self.copyDefaultWhiteChars = True
     832          self.mayReturnEmpty = False # used when checking for left-recursion
     833          self.keepTabs = False
     834          self.ignoreExprs = list()
     835          self.debug = False
     836          self.streamlined = False
     837          self.mayIndexError = True # used to optimize exception handling for subclasses that don't advance parse index
     838          self.errmsg = ""
     839          self.modalResults = True # used to mark results names as modal (report only last) or cumulative (list all)
     840          self.debugActions = ( None, None, None ) #custom debug actions
     841          self.re = None
     842          self.callPreparse = True # used to avoid redundant calls to preParse
     843          self.callDuringTry = False
     844
     845 -    def copy( self ):
     846          """Make a copy of this C{ParserElement}.  Useful for defining different parse actions
     847             for the same parsing pattern, using copies of the original parse element."""
     848          cpy = copy.copy( self )
     849          cpy.parseAction = self.parseAction[:]
     850          cpy.ignoreExprs = self.ignoreExprs[:]
     851          if self.copyDefaultWhiteChars:
     852              cpy.whiteChars = ParserElement.DEFAULT_WHITE_CHARS
     853          return cpy
     854
     855 -    def setName( self, name ):
     856          """Define name for this expression, for use in debugging."""
     857          self.name = name
     858          self.errmsg = "Expected " + self.name
     859          if hasattr(self,"exception"):
     860              self.exception.msg = self.errmsg
     861          return self
     862
     863 -    def setResultsName( self, name, listAllMatches=False ):
     864          """Define name for referencing matching tokens as a nested attribute
     865             of the returned parse results.
     866             NOTE: this returns a *copy* of the original C{ParserElement} object;
     867             this is so that the client can define a basic element, such as an
     868             integer, and reference it in multiple places with different names.
     869
     870             You can also set results names using the abbreviated syntax,
     871             C{expr("name")} in place of C{expr.setResultsName("name")} -
     872             see L{I{__call__}<__call__>}.
     873          """
     874          newself = self.copy()
     875          if name.endswith("*"):
     876              name = name[:-1]
     877              listAllMatches=True
     878          newself.resultsName = name
     879          newself.modalResults = not listAllMatches
     880          return newself
     881
     882 -    def setBreak(self,breakFlag = True):
     883          """Method to invoke the Python pdb debugger when this element is
     884             about to be parsed. Set C{breakFlag} to True to enable, False to
     885             disable.
     886          """
     887          if breakFlag:
     888              _parseMethod = self._parse
     889              def breaker(instring, loc, doActions=True, callPreParse=True):
     890                  import pdb
     891                  pdb.set_trace()
     892                  return _parseMethod( instring, loc, doActions, callPreParse )
     893              breaker._originalParseMethod = _parseMethod
     894              self._parse = breaker
     895          else:
     896              if hasattr(self._parse,"_originalParseMethod"):
     897                  self._parse = self._parse._originalParseMethod
     898          return self
     899
     900 -    def setParseAction( self, *fns, **kwargs ):
     901          """Define action to perform when successfully matching parse element definition.
     902             Parse action fn is a callable method with 0-3 arguments, called as C{fn(s,loc,toks)},
     903             C{fn(loc,toks)}, C{fn(toks)}, or just C{fn()}, where:
     904              - s   = the original string being parsed (see note below)
     905              - loc = the location of the matching substring
     906              - toks = a list of the matched tokens, packaged as a C{L{ParseResults}} object
     907             If the functions in fns modify the tokens, they can return them as the return
     908             value from fn, and the modified list of tokens will replace the original.
     909             Otherwise, fn does not need to return any value.
     910
     911             Note: the default parsing behavior is to expand tabs in the input string
     912             before starting the parsing process.  See L{I{parseString}<parseString>} for more information
     913             on parsing strings containing C{<TAB>}s, and suggested methods to maintain a
     914             consistent view of the parsed string, the parse location, and line and column
     915             positions within the parsed string.
     916             """
     917          self.parseAction = list(map(_trim_arity, list(fns)))
     918          self.callDuringTry = kwargs.get("callDuringTry", False)
     919          return self
     920
     921 -    def addParseAction( self, *fns, **kwargs ):
     922          """Add parse action to expression's list of parse actions. See L{I{setParseAction}<setParseAction>}."""
     923          self.parseAction += list(map(_trim_arity, list(fns)))
     924          self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False)
     925          return self
     926
     927 -    def addCondition(self, *fns, **kwargs):
     928          """Add a boolean predicate function to expression's list of parse actions. See
     929          L{I{setParseAction}<setParseAction>}. Optional keyword argument C{message} can
     930          be used to define a custom message to be used in the raised exception."""
     931          msg = kwargs.get("message") or "failed user-defined condition"
     932          for fn in fns:
     933              def pa(s,l,t):
     934                  if not bool(_trim_arity(fn)(s,l,t)):
     935                      raise ParseException(s,l,msg)
     936                  return t
     937              self.parseAction.append(pa)
     938          self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False)
     939          return self
     940
     941 -    def setFailAction( self, fn ):
     942          """Define action to perform if parsing fails at this expression.
     943             Fail acton fn is a callable function that takes the arguments
     944             C{fn(s,loc,expr,err)} where:
     945              - s = string being parsed
     946              - loc = location where expression match was attempted and failed
     947              - expr = the parse expression that failed
     948              - err = the exception thrown
     949             The function returns no value.  It may throw C{L{ParseFatalException}}
     950             if it is desired to stop parsing immediately."""
     951          self.failAction = fn
     952          return self
     953
     954 -    def _skipIgnorables( self, instring, loc ):
     955          exprsFound = True
     956          while exprsFound:
     957              exprsFound = False
     958              for e in self.ignoreExprs:
     959                  try:
     960                      while 1:
     961                          loc,dummy = e._parse( instring, loc )
     962                          exprsFound = True
     963                  except ParseException:
     964                      pass
     965          return loc
     966
     967 -    def preParse( self, instring, loc ):
     968          if self.ignoreExprs:
     969              loc = self._skipIgnorables( instring, loc )
     970
     971          if self.skipWhitespace:
     972              wt = self.whiteChars
     973              instrlen = len(instring)
     974              while loc < instrlen and instring[loc] in wt:
     975                  loc += 1
     976
     977          return loc
     978
     979 -    def parseImpl( self, instring, loc, doActions=True ):
     980          return loc, []
     981
     982 -    def postParse( self, instring, loc, tokenlist ):
     983          return tokenlist
     984
     985      #~ @profile
     986 -    def _parseNoCache( self, instring, loc, doActions=True, callPreParse=True ):
     987          debugging = ( self.debug ) #and doActions )
     988
     989          if debugging or self.failAction:
     990              #~ print ("Match",self,"at loc",loc,"(%d,%d)" % ( lineno(loc,instring), col(loc,instring) ))
     991              if (self.debugActions[0] ):
     992                  self.debugActions[0]( instring, loc, self )
     993              if callPreParse and self.callPreparse:
     994                  preloc = self.preParse( instring, loc )
     995              else:
     996                  preloc = loc
     997              tokensStart = preloc
     998              try:
     999                  try:
    1000                      loc,tokens = self.parseImpl( instring, preloc, doActions )
    1001                  except IndexError:
    1002                      raise ParseException( instring, len(instring), self.errmsg, self )
    1003              except ParseBaseException as err:
    1004                  #~ print ("Exception raised:", err)
    1005                  if self.debugActions[2]:
    1006                      self.debugActions[2]( instring, tokensStart, self, err )
    1007                  if self.failAction:
    1008                      self.failAction( instring, tokensStart, self, err )
    1009                  raise
    1010          else:
    1011              if callPreParse and self.callPreparse:
    1012                  preloc = self.preParse( instring, loc )
    1013              else:
    1014                  preloc = loc
    1015              tokensStart = preloc
    1016              if self.mayIndexError or loc >= len(instring):
    1017                  try:
    1018                      loc,tokens = self.parseImpl( instring, preloc, doActions )
    1019                  except IndexError:
    1020                      raise ParseException( instring, len(instring), self.errmsg, self )
    1021              else:
    1022                  loc,tokens = self.parseImpl( instring, preloc, doActions )
    1023
    1024          tokens = self.postParse( instring, loc, tokens )
    1025
    1026          retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList, modal=self.modalResults )
    1027          if self.parseAction and (doActions or self.callDuringTry):
    1028              if debugging:
    1029                  try:
    1030                      for fn in self.parseAction:
    1031                          tokens = fn( instring, tokensStart, retTokens )
    1032                          if tokens is not None:
    1033                              retTokens = ParseResults( tokens,
    1034                                                        self.resultsName,
    1035                                                        asList=self.saveAsList and isinstance(tokens,(ParseResults,list)),
    1036                                                        modal=self.modalResults )
    1037                  except ParseBaseException as err:
    1038                      #~ print "Exception raised in user parse action:", err
    1039                      if (self.debugActions[2] ):
    1040                          self.debugActions[2]( instring, tokensStart, self, err )
    1041                      raise
    1042              else:
    1043                  for fn in self.parseAction:
    1044                      tokens = fn( instring, tokensStart, retTokens )
    1045                      if tokens is not None:
    1046                          retTokens = ParseResults( tokens,
    1047                                                    self.resultsName,
    1048                                                    asList=self.saveAsList and isinstance(tokens,(ParseResults,list)),
    1049                                                    modal=self.modalResults )
    1050
    1051          if debugging:
    1052              #~ print ("Matched",self,"->",retTokens.asList())
    1053              if (self.debugActions[1] ):
    1054                  self.debugActions[1]( instring, tokensStart, loc, self, retTokens )
    1055
    1056          return loc, retTokens
    1057
    1058 -    def tryParse( self, instring, loc ):
    1059          try:
    1060              return self._parse( instring, loc, doActions=False )[0]
    1061          except ParseFatalException:
    1062              raise ParseException( instring, loc, self.errmsg, self)
    1063
    1064 -    def canParseNext(self, instring, loc):
    1065          try:
    1066              self.tryParse(instring, loc)
    1067          except (ParseException, IndexError):
    1068              return False
    1069          else:
    1070              return True
    1071
    1072      # this method gets repeatedly called during backtracking with the same arguments -
    1073      # we can cache these arguments and save ourselves the trouble of re-parsing the contained expression
    1074 -    def _parseCache( self, instring, loc, doActions=True, callPreParse=True ):
    1075          lookup = (self,instring,loc,callPreParse,doActions)
    1076          if lookup in ParserElement._exprArgCache:
    1077              value = ParserElement._exprArgCache[ lookup ]
    1078              if isinstance(value, Exception):
    1079                  raise value
    1080              return (value[0],value[1].copy())
    1081          else:
    1082              try:
    1083                  value = self._parseNoCache( instring, loc, doActions, callPreParse )
    1084                  ParserElement._exprArgCache[ lookup ] = (value[0],value[1].copy())
    1085                  return value
    1086              except ParseBaseException as pe:
    1087                  pe.__traceback__ = None
    1088                  ParserElement._exprArgCache[ lookup ] = pe
    1089                  raise
    1090
    1091      _parse = _parseNoCache
    1092
    1093      # argument cache for optimizing repeated calls when backtracking through recursive expressions
    1094      _exprArgCache = {}
    1095      @staticmethod
    1096 -    def resetCache():
    1097          ParserElement._exprArgCache.clear()
    1098
    1099      _packratEnabled = False
    1100      @staticmethod
    1101 -    def enablePackrat():
    1102          """Enables "packrat" parsing, which adds memoizing to the parsing logic.
    1103             Repeated parse attempts at the same string location (which happens
    1104             often in many complex grammars) can immediately return a cached value,
    1105             instead of re-executing parsing/validating code.  Memoizing is done of
    1106             both valid results and parsing exceptions.
    1107
    1108             This speedup may break existing programs that use parse actions that
    1109             have side-effects.  For this reason, packrat parsing is disabled when
    1110             you first import pyparsing.  To activate the packrat feature, your
    1111             program must call the class method C{ParserElement.enablePackrat()}.  If
    1112             your program uses C{psyco} to "compile as you go", you must call
    1113             C{enablePackrat} before calling C{psyco.full()}.  If you do not do this,
    1114             Python will crash.  For best results, call C{enablePackrat()} immediately
    1115             after importing pyparsing.
    1116          """
    1117          if not ParserElement._packratEnabled:
    1118              ParserElement._packratEnabled = True
    1119              ParserElement._parse = ParserElement._parseCache
    1120
    1121 -    def parseString( self, instring, parseAll=False ):
    1122          """Execute the parse expression with the given string.
    1123             This is the main interface to the client code, once the complete
    1124             expression has been built.
    1125
    1126             If you want the grammar to require that the entire input string be
    1127             successfully parsed, then set C{parseAll} to True (equivalent to ending
    1128             the grammar with C{L{StringEnd()}}).
    1129
    1130             Note: C{parseString} implicitly calls C{expandtabs()} on the input string,
    1131             in order to report proper column numbers in parse actions.
    1132             If the input string contains tabs and
    1133             the grammar uses parse actions that use the C{loc} argument to index into the
    1134             string being parsed, you can ensure you have a consistent view of the input
    1135             string by:
    1136              - calling C{parseWithTabs} on your grammar before calling C{parseString}
    1137                (see L{I{parseWithTabs}<parseWithTabs>})
    1138              - define your parse action using the full C{(s,loc,toks)} signature, and
    1139                reference the input string using the parse action's C{s} argument
    1140              - explictly expand the tabs in your input string before calling
    1141                C{parseString}
    1142          """
    1143          ParserElement.resetCache()
    1144          if not self.streamlined:
    1145              self.streamline()
    1146              #~ self.saveAsList = True
    1147          for e in self.ignoreExprs:
    1148              e.streamline()
    1149          if not self.keepTabs:
    1150              instring = instring.expandtabs()
    1151          try:
    1152              loc, tokens = self._parse( instring, 0 )
    1153              if parseAll:
    1154                  loc = self.preParse( instring, loc )
    1155                  se = Empty() + StringEnd()
    1156                  se._parse( instring, loc )
    1157          except ParseBaseException as exc:
    1158              if ParserElement.verbose_stacktrace:
    1159                  raise
    1160              else:
    1161                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1162                  raise exc
    1163          else:
    1164              return tokens
    1165
    1166 -    def scanString( self, instring, maxMatches=_MAX_INT, overlap=False ):
    1167          """Scan the input string for expression matches.  Each match will return the
    1168             matching tokens, start location, and end location.  May be called with optional
    1169             C{maxMatches} argument, to clip scanning after 'n' matches are found.  If
    1170             C{overlap} is specified, then overlapping matches will be reported.
    1171
    1172             Note that the start and end locations are reported relative to the string
    1173             being parsed.  See L{I{parseString}<parseString>} for more information on parsing
    1174             strings with embedded tabs."""
    1175          if not self.streamlined:
    1176              self.streamline()
    1177          for e in self.ignoreExprs:
    1178              e.streamline()
    1179
    1180          if not self.keepTabs:
    1181              instring = _ustr(instring).expandtabs()
    1182          instrlen = len(instring)
    1183          loc = 0
    1184          preparseFn = self.preParse
    1185          parseFn = self._parse
    1186          ParserElement.resetCache()
    1187          matches = 0
    1188          try:
    1189              while loc <= instrlen and matches < maxMatches:
    1190                  try:
    1191                      preloc = preparseFn( instring, loc )
    1192                      nextLoc,tokens = parseFn( instring, preloc, callPreParse=False )
    1193                  except ParseException:
    1194                      loc = preloc+1
    1195                  else:
    1196                      if nextLoc > loc:
    1197                          matches += 1
    1198                          yield tokens, preloc, nextLoc
    1199                          if overlap:
    1200                              nextloc = preparseFn( instring, loc )
    1201                              if nextloc > loc:
    1202                                  loc = nextLoc
    1203                              else:
    1204                                  loc += 1
    1205                          else:
    1206                              loc = nextLoc
    1207                      else:
    1208                          loc = preloc+1
    1209          except ParseBaseException as exc:
    1210              if ParserElement.verbose_stacktrace:
    1211                  raise
    1212              else:
    1213                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1214                  raise exc
    1215
    1216 -    def transformString( self, instring ):
    1217          """Extension to C{L{scanString}}, to modify matching text with modified tokens that may
    1218             be returned from a parse action.  To use C{transformString}, define a grammar and
    1219             attach a parse action to it that modifies the returned token list.
    1220             Invoking C{transformString()} on a target string will then scan for matches,
    1221             and replace the matched text patterns according to the logic in the parse
    1222             action.  C{transformString()} returns the resulting transformed string."""
    1223          out = []
    1224          lastE = 0
    1225          # force preservation of <TAB>s, to minimize unwanted transformation of string, and to
    1226          # keep string locs straight between transformString and scanString
    1227          self.keepTabs = True
    1228          try:
    1229              for t,s,e in self.scanString( instring ):
    1230                  out.append( instring[lastE:s] )
    1231                  if t:
    1232                      if isinstance(t,ParseResults):
    1233                          out += t.asList()
    1234                      elif isinstance(t,list):
    1235                          out += t
    1236                      else:
    1237                          out.append(t)
    1238                  lastE = e
    1239              out.append(instring[lastE:])
    1240              out = [o for o in out if o]
    1241              return "".join(map(_ustr,_flatten(out)))
    1242          except ParseBaseException as exc:
    1243              if ParserElement.verbose_stacktrace:
    1244                  raise
    1245              else:
    1246                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1247                  raise exc
    1248
    1249 -    def searchString( self, instring, maxMatches=_MAX_INT ):
    1250          """Another extension to C{L{scanString}}, simplifying the access to the tokens found
    1251             to match the given parse expression.  May be called with optional
    1252             C{maxMatches} argument, to clip searching after 'n' matches are found.
    1253          """
    1254          try:
    1255              return ParseResults([ t for t,s,e in self.scanString( instring, maxMatches ) ])
    1256          except ParseBaseException as exc:
    1257              if ParserElement.verbose_stacktrace:
    1258                  raise
    1259              else:
    1260                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1261                  raise exc
    1262
    1263 -    def __add__(self, other ):
    1264          """Implementation of + operator - returns C{L{And}}"""
    1265          if isinstance( other, basestring ):
    1266              other = ParserElement.literalStringClass( other )
    1267          if not isinstance( other, ParserElement ):
    1268              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1269                      SyntaxWarning, stacklevel=2)
    1270              return None
    1271          return And( [ self, other ] )
    1272
    1273 -    def __radd__(self, other ):
    1274          """Implementation of + operator when left operand is not a C{L{ParserElement}}"""
    1275          if isinstance( other, basestring ):
    1276              other = ParserElement.literalStringClass( other )
    1277          if not isinstance( other, ParserElement ):
    1278              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1279                      SyntaxWarning, stacklevel=2)
    1280              return None
    1281          return other + self
    1282
    1283 -    def __sub__(self, other):
    1284          """Implementation of - operator, returns C{L{And}} with error stop"""
    1285          if isinstance( other, basestring ):
    1286              other = ParserElement.literalStringClass( other )
    1287          if not isinstance( other, ParserElement ):
    1288              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1289                      SyntaxWarning, stacklevel=2)
    1290              return None
    1291          return And( [ self, And._ErrorStop(), other ] )
    1292
    1293 -    def __rsub__(self, other ):
    1294          """Implementation of - operator when left operand is not a C{L{ParserElement}}"""
    1295          if isinstance( other, basestring ):
    1296              other = ParserElement.literalStringClass( other )
    1297          if not isinstance( other, ParserElement ):
    1298              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1299                      SyntaxWarning, stacklevel=2)
    1300              return None
    1301          return other - self
    1302
    1303 -    def __mul__(self,other):
    1304          """Implementation of * operator, allows use of C{expr * 3} in place of
    1305             C{expr + expr + expr}.  Expressions may also me multiplied by a 2-integer
    1306             tuple, similar to C{{min,max}} multipliers in regular expressions.  Tuples
    1307             may also include C{None} as in:
    1308              - C{expr*(n,None)} or C{expr*(n,)} is equivalent
    1309                to C{expr*n + L{ZeroOrMore}(expr)}
    1310                (read as "at least n instances of C{expr}")
    1311              - C{expr*(None,n)} is equivalent to C{expr*(0,n)}
    1312                (read as "0 to n instances of C{expr}")
    1313              - C{expr*(None,None)} is equivalent to C{L{ZeroOrMore}(expr)}
    1314              - C{expr*(1,None)} is equivalent to C{L{OneOrMore}(expr)}
    1315
    1316             Note that C{expr*(None,n)} does not raise an exception if
    1317             more than n exprs exist in the input stream; that is,
    1318             C{expr*(None,n)} does not enforce a maximum number of expr
    1319             occurrences.  If this behavior is desired, then write
    1320             C{expr*(None,n) + ~expr}
    1321
    1322          """
    1323          if isinstance(other,int):
    1324              minElements, optElements = other,0
    1325          elif isinstance(other,tuple):
    1326              other = (other + (None, None))[:2]
    1327              if other[0] is None:
    1328                  other = (0, other[1])
    1329              if isinstance(other[0],int) and other[1] is None:
    1330                  if other[0] == 0:
    1331                      return ZeroOrMore(self)
    1332                  if other[0] == 1:
    1333                      return OneOrMore(self)
    1334                  else:
    1335                      return self*other[0] + ZeroOrMore(self)
    1336              elif isinstance(other[0],int) and isinstance(other[1],int):
    1337                  minElements, optElements = other
    1338                  optElements -= minElements
    1339              else:
    1340                  raise TypeError("cannot multiply 'ParserElement' and ('%s','%s') objects", type(other[0]),type(other[1]))
    1341          else:
    1342              raise TypeError("cannot multiply 'ParserElement' and '%s' objects", type(other))
    1343
    1344          if minElements < 0:
    1345              raise ValueError("cannot multiply ParserElement by negative value")
    1346          if optElements < 0:
    1347              raise ValueError("second tuple value must be greater or equal to first tuple value")
    1348          if minElements == optElements == 0:
    1349              raise ValueError("cannot multiply ParserElement by 0 or (0,0)")
    1350
    1351          if (optElements):
    1352              def makeOptionalList(n):
    1353                  if n>1:
    1354                      return Optional(self + makeOptionalList(n-1))
    1355                  else:
    1356                      return Optional(self)
    1357              if minElements:
    1358                  if minElements == 1:
    1359                      ret = self + makeOptionalList(optElements)
    1360                  else:
    1361                      ret = And([self]*minElements) + makeOptionalList(optElements)
    1362              else:
    1363                  ret = makeOptionalList(optElements)
    1364          else:
    1365              if minElements == 1:
    1366                  ret = self
    1367              else:
    1368                  ret = And([self]*minElements)
    1369          return ret
    1370
    1371 -    def __rmul__(self, other):
    1372          return self.__mul__(other)
    1373
    1374 -    def __or__(self, other ):
    1375          """Implementation of | operator - returns C{L{MatchFirst}}"""
    1376          if isinstance( other, basestring ):
    1377              other = ParserElement.literalStringClass( other )
    1378          if not isinstance( other, ParserElement ):
    1379              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1380                      SyntaxWarning, stacklevel=2)
    1381              return None
    1382          return MatchFirst( [ self, other ] )
    1383
    1384 -    def __ror__(self, other ):
    1385          """Implementation of | operator when left operand is not a C{L{ParserElement}}"""
    1386          if isinstance( other, basestring ):
    1387              other = ParserElement.literalStringClass( other )
    1388          if not isinstance( other, ParserElement ):
    1389              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1390                      SyntaxWarning, stacklevel=2)
    1391              return None
    1392          return other | self
    1393
    1394 -    def __xor__(self, other ):
    1395          """Implementation of ^ operator - returns C{L{Or}}"""
    1396          if isinstance( other, basestring ):
    1397              other = ParserElement.literalStringClass( other )
    1398          if not isinstance( other, ParserElement ):
    1399              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1400                      SyntaxWarning, stacklevel=2)
    1401              return None
    1402          return Or( [ self, other ] )
    1403
    1404 -    def __rxor__(self, other ):
    1405          """Implementation of ^ operator when left operand is not a C{L{ParserElement}}"""
    1406          if isinstance( other, basestring ):
    1407              other = ParserElement.literalStringClass( other )
    1408          if not isinstance( other, ParserElement ):
    1409              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1410                      SyntaxWarning, stacklevel=2)
    1411              return None
    1412          return other ^ self
    1413
    1414 -    def __and__(self, other ):
    1415          """Implementation of & operator - returns C{L{Each}}"""
    1416          if isinstance( other, basestring ):
    1417              other = ParserElement.literalStringClass( other )
    1418          if not isinstance( other, ParserElement ):
    1419              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1420                      SyntaxWarning, stacklevel=2)
    1421              return None
    1422          return Each( [ self, other ] )
    1423
    1424 -    def __rand__(self, other ):
    1425          """Implementation of & operator when left operand is not a C{L{ParserElement}}"""
    1426          if isinstance( other, basestring ):
    1427              other = ParserElement.literalStringClass( other )
    1428          if not isinstance( other, ParserElement ):
    1429              warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
    1430                      SyntaxWarning, stacklevel=2)
    1431              return None
    1432          return other & self
    1433
    1434 -    def __invert__( self ):
    1435          """Implementation of ~ operator - returns C{L{NotAny}}"""
    1436          return NotAny( self )
    1437
    1438 -    def __call__(self, name=None):
    1439          """Shortcut for C{L{setResultsName}}, with C{listAllMatches=default}::
    1440               userdata = Word(alphas).setResultsName("name") + Word(nums+"-").setResultsName("socsecno")
    1441             could be written as::
    1442               userdata = Word(alphas)("name") + Word(nums+"-")("socsecno")
    1443
    1444             If C{name} is given with a trailing C{'*'} character, then C{listAllMatches} will be
    1445             passed as C{True}.
    1446
    1447             If C{name} is omitted, same as calling C{L{copy}}.
    1448             """
    1449          if name is not None:
    1450              return self.setResultsName(name)
    1451          else:
    1452              return self.copy()
    1453
    1454 -    def suppress( self ):
    1455          """Suppresses the output of this C{ParserElement}; useful to keep punctuation from
    1456             cluttering up returned output.
    1457          """
    1458          return Suppress( self )
    1459
    1460 -    def leaveWhitespace( self ):
    1461          """Disables the skipping of whitespace before matching the characters in the
    1462             C{ParserElement}'s defined pattern.  This is normally only used internally by
    1463             the pyparsing module, but may be needed in some whitespace-sensitive grammars.
    1464          """
    1465          self.skipWhitespace = False
    1466          return self
    1467
    1468 -    def setWhitespaceChars( self, chars ):
    1469          """Overrides the default whitespace chars
    1470          """
    1471          self.skipWhitespace = True
    1472          self.whiteChars = chars
    1473          self.copyDefaultWhiteChars = False
    1474          return self
    1475
    1476 -    def parseWithTabs( self ):
    1477          """Overrides default behavior to expand C{<TAB>}s to spaces before parsing the input string.
    1478             Must be called before C{parseString} when the input grammar contains elements that
    1479             match C{<TAB>} characters."""
    1480          self.keepTabs = True
    1481          return self
    1482
    1483 -    def ignore( self, other ):
    1484          """Define expression to be ignored (e.g., comments) while doing pattern
    1485             matching; may be called repeatedly, to define multiple comment or other
    1486             ignorable patterns.
    1487          """
    1488          if isinstance(other, basestring):
    1489              other = Suppress(other)
    1490
    1491          if isinstance( other, Suppress ):
    1492              if other not in self.ignoreExprs:
    1493                  self.ignoreExprs.append(other)
    1494          else:
    1495              self.ignoreExprs.append( Suppress( other.copy() ) )
    1496          return self
    1497
    1498 -    def setDebugActions( self, startAction, successAction, exceptionAction ):
    1499          """Enable display of debugging messages while doing pattern matching."""
    1500          self.debugActions = (startAction or _defaultStartDebugAction,
    1501                               successAction or _defaultSuccessDebugAction,
    1502                               exceptionAction or _defaultExceptionDebugAction)
    1503          self.debug = True
    1504          return self
    1505
    1506 -    def setDebug( self, flag=True ):
    1507          """Enable display of debugging messages while doing pattern matching.
    1508             Set C{flag} to True to enable, False to disable."""
    1509          if flag:
    1510              self.setDebugActions( _defaultStartDebugAction, _defaultSuccessDebugAction, _defaultExceptionDebugAction )
    1511          else:
    1512              self.debug = False
    1513          return self
    1514
    1515 -    def __str__( self ):
    1516          return self.name
    1517
    1518 -    def __repr__( self ):
    1519          return _ustr(self)
    1520
    1521 -    def streamline( self ):
    1522          self.streamlined = True
    1523          self.strRepr = None
    1524          return self
    1525
    1526 -    def checkRecursion( self, parseElementList ):
    1527          pass
    1528
    1529 -    def validate( self, validateTrace=[] ):
    1530          """Check defined expressions for valid structure, check for infinite recursive definitions."""
    1531          self.checkRecursion( [] )
    1532
    1533 -    def parseFile( self, file_or_filename, parseAll=False ):
    1534          """Execute the parse expression on the given file or filename.
    1535             If a filename is specified (instead of a file object),
    1536             the entire file is opened, read, and closed before parsing.
    1537          """
    1538          try:
    1539              file_contents = file_or_filename.read()
    1540          except AttributeError:
    1541              f = open(file_or_filename, "r")
    1542              file_contents = f.read()
    1543              f.close()
    1544          try:
    1545              return self.parseString(file_contents, parseAll)
    1546          except ParseBaseException as exc:
    1547              if ParserElement.verbose_stacktrace:
    1548                  raise
    1549              else:
    1550                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
    1551                  raise exc
    1552
    1553 -    def __eq__(self,other):
    1554          if isinstance(other, ParserElement):
    1555              return self is other or self.__dict__ == other.__dict__
    1556          elif isinstance(other, basestring):
    1557              try:
    1558                  self.parseString(_ustr(other), parseAll=True)
    1559                  return True
    1560              except ParseBaseException:
    1561                  return False
    1562          else:
    1563              return super(ParserElement,self)==other
    1564
    1565 -    def __ne__(self,other):
    1566          return not (self == other)
    1567
    1568 -    def __hash__(self):
    1569          return hash(id(self))
    1570
    1571 -    def __req__(self,other):
    1572          return self == other
    1573
    1574 -    def __rne__(self,other):
    1575          return not (self == other)
    1576
    1577 -    def runTests(self, tests, parseAll=False):
    1578          """Execute the parse expression on a series of test strings, showing each
    1579             test, the parsed results or where the parse failed. Quick and easy way to
    1580             run a parse expression against a list of sample strings.
    1581
    1582             Parameters:
    1583              - tests - a list of separate test strings, or a multiline string of test strings
    1584              - parseAll - (default=False) - flag to pass to C{L{parseString}} when running tests
    1585          """
    1586          if isinstance(tests, basestring):
    1587              tests = map(str.strip, tests.splitlines())
    1588          for t in tests:
    1589              out = [t]
    1590              try:
    1591                  out.append(self.parseString(t, parseAll=parseAll).dump())
    1592              except ParseException as pe:
    1593                  if '\n' in t:
    1594                      out.append(line(pe.loc, t))
    1595                      out.append(' '*(col(pe.loc,t)-1) + '^')
    1596                  else:
    1597                      out.append(' '*pe.loc + '^')
    1598                  out.append(str(pe))
    1599              out.append('')
    1600              print('\n'.join(out))
    1601
    1602
    1603 -class Token(ParserElement):
    1604      """Abstract C{ParserElement} subclass, for defining atomic matching patterns."""
    1605 -    def __init__( self ):
    1606          super(Token,self).__init__( savelist=False )
    1607
    1608
    1609 -class Empty(Token):
    1610      """An empty token, will always match."""
    1611 -    def __init__( self ):
    1612          super(Empty,self).__init__()
    1613          self.name = "Empty"
    1614          self.mayReturnEmpty = True
    1615          self.mayIndexError = False
    1616
    1617
    1618 -class NoMatch(Token):
    1619      """A token that will never match."""
    1620 -    def __init__( self ):
    1621          super(NoMatch,self).__init__()
    1622          self.name = "NoMatch"
    1623          self.mayReturnEmpty = True
    1624          self.mayIndexError = False
    1625          self.errmsg = "Unmatchable token"
    1626
    1627 -    def parseImpl( self, instring, loc, doActions=True ):
    1628          raise ParseException(instring, loc, self.errmsg, self)
    1629
    1630
    1631 -class Literal(Token):
    1632      """Token to exactly match a specified string."""
    1633 -    def __init__( self, matchString ):
    1634          super(Literal,self).__init__()
    1635          self.match = matchString
    1636          self.matchLen = len(matchString)
    1637          try:
    1638              self.firstMatchChar = matchString[0]
    1639          except IndexError:
    1640              warnings.warn("null string passed to Literal; use Empty() instead",
    1641                              SyntaxWarning, stacklevel=2)
    1642              self.__class__ = Empty
    1643          self.name = '"%s"' % _ustr(self.match)
    1644          self.errmsg = "Expected " + self.name
    1645          self.mayReturnEmpty = False
    1646          self.mayIndexError = False
    1647
    1648      # Performance tuning: this routine gets called a *lot*
    1649      # if this is a single character match string  and the first character matches,
    1650      # short-circuit as quickly as possible, and avoid calling startswith
    1651      #~ @profile
    1652 -    def parseImpl( self, instring, loc, doActions=True ):
    1653          if (instring[loc] == self.firstMatchChar and
    1654              (self.matchLen==1 or instring.startswith(self.match,loc)) ):
    1655              return loc+self.matchLen, self.match
    1656          raise ParseException(instring, loc, self.errmsg, self)
    1657  _L = Literal
    1658  ParserElement.literalStringClass = Literal
    1659
    1660 -class Keyword(Token):
    1661      """Token to exactly match a specified string as a keyword, that is, it must be
    1662         immediately followed by a non-keyword character.  Compare with C{L{Literal}}::
    1663           Literal("if") will match the leading C{'if'} in C{'ifAndOnlyIf'}.
    1664           Keyword("if") will not; it will only match the leading C{'if'} in C{'if x=1'}, or C{'if(y==2)'}
    1665         Accepts two optional constructor arguments in addition to the keyword string:
    1666         C{identChars} is a string of characters that would be valid identifier characters,
    1667         defaulting to all alphanumerics + "_" and "$"; C{caseless} allows case-insensitive
    1668         matching, default is C{False}.
    1669      """
    1670      DEFAULT_KEYWORD_CHARS = alphanums+"_$"
    1671
    1672 -    def __init__( self, matchString, identChars=DEFAULT_KEYWORD_CHARS, caseless=False ):
    1673          super(Keyword,self).__init__()
    1674          self.match = matchString
    1675          self.matchLen = len(matchString)
    1676          try:
    1677              self.firstMatchChar = matchString[0]
    1678          except IndexError:
    1679              warnings.warn("null string passed to Keyword; use Empty() instead",
    1680                              SyntaxWarning, stacklevel=2)
    1681          self.name = '"%s"' % self.match
    1682          self.errmsg = "Expected " + self.name
    1683          self.mayReturnEmpty = False
    1684          self.mayIndexError = False
    1685          self.caseless = caseless
    1686          if caseless:
    1687              self.caselessmatch = matchString.upper()
    1688              identChars = identChars.upper()
    1689          self.identChars = set(identChars)
    1690
    1691 -    def parseImpl( self, instring, loc, doActions=True ):
    1692          if self.caseless:
    1693              if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and
    1694                   (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) and
    1695                   (loc == 0 or instring[loc-1].upper() not in self.identChars) ):
    1696                  return loc+self.matchLen, self.match
    1697          else:
    1698              if (instring[loc] == self.firstMatchChar and
    1699                  (self.matchLen==1 or instring.startswith(self.match,loc)) and
    1700                  (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen] not in self.identChars) and
    1701                  (loc == 0 or instring[loc-1] not in self.identChars) ):
    1702                  return loc+self.matchLen, self.match
    1703          raise ParseException(instring, loc, self.errmsg, self)
    1704
    1705 -    def copy(self):
    1706          c = super(Keyword,self).copy()
    1707          c.identChars = Keyword.DEFAULT_KEYWORD_CHARS
    1708          return c
    1709
    1710      @staticmethod
    1711 -    def setDefaultKeywordChars( chars ):
    1712          """Overrides the default Keyword chars
    1713          """
    1714          Keyword.DEFAULT_KEYWORD_CHARS = chars
    1715
    1716 -class CaselessLiteral(Literal):
    1717      """Token to match a specified string, ignoring case of letters.
    1718         Note: the matched results will always be in the case of the given
    1719         match string, NOT the case of the input text.
    1720      """
    1721 -    def __init__( self, matchString ):
    1722          super(CaselessLiteral,self).__init__( matchString.upper() )
    1723          # Preserve the defining literal.
    1724          self.returnString = matchString
    1725          self.name = "'%s'" % self.returnString
    1726          self.errmsg = "Expected " + self.name
    1727
    1728 -    def parseImpl( self, instring, loc, doActions=True ):
    1729          if instring[ loc:loc+self.matchLen ].upper() == self.match:
    1730              return loc+self.matchLen, self.returnString
    1731          raise ParseException(instring, loc, self.errmsg, self)
    1732
    1733 -class CaselessKeyword(Keyword):
    1734 -    def __init__( self, matchString, identChars=Keyword.DEFAULT_KEYWORD_CHARS ):
    1735          super(CaselessKeyword,self).__init__( matchString, identChars, caseless=True )
    1736
    1737 -    def parseImpl( self, instring, loc, doActions=True ):
    1738          if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and
    1739               (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) ):
    1740              return loc+self.matchLen, self.match
    1741          raise ParseException(instring, loc, self.errmsg, self)
    1742
    1743 -class Word(Token):
    1744      """Token for matching words composed of allowed character sets.
    1745         Defined with string containing all allowed initial characters,
    1746         an optional string containing allowed body characters (if omitted,
    1747         defaults to the initial character set), and an optional minimum,
    1748         maximum, and/or exact length.  The default value for C{min} is 1 (a
    1749         minimum value < 1 is not valid); the default values for C{max} and C{exact}
    1750         are 0, meaning no maximum or exact length restriction. An optional
    1751         C{excludeChars} parameter can list characters that might be found in
    1752         the input C{bodyChars} string; useful to define a word of all printables
    1753         except for one or two characters, for instance.
    1754      """
    1755 -    def __init__( self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None ):
    1756          super(Word,self).__init__()
    1757          if excludeChars:
    1758              initChars = ''.join(c for c in initChars if c not in excludeChars)
    1759              if bodyChars:
    1760                  bodyChars = ''.join(c for c in bodyChars if c not in excludeChars)
    1761          self.initCharsOrig = initChars
    1762          self.initChars = set(initChars)
    1763          if bodyChars :
    1764              self.bodyCharsOrig = bodyChars
    1765              self.bodyChars = set(bodyChars)
    1766          else:
    1767              self.bodyCharsOrig = initChars
    1768              self.bodyChars = set(initChars)
    1769
    1770          self.maxSpecified = max > 0
    1771
    1772          if min < 1:
    1773              raise ValueError("cannot specify a minimum length < 1; use Optional(Word()) if zero-length word is permitted")
    1774
    1775          self.minLen = min
    1776
    1777          if max > 0:
    1778              self.maxLen = max
    1779          else:
    1780              self.maxLen = _MAX_INT
    1781
    1782          if exact > 0:
    1783              self.maxLen = exact
    1784              self.minLen = exact
    1785
    1786          self.name = _ustr(self)
    1787          self.errmsg = "Expected " + self.name
    1788          self.mayIndexError = False
    1789          self.asKeyword = asKeyword
    1790
    1791          if ' ' not in self.initCharsOrig+self.bodyCharsOrig and (min==1 and max==0 and exact==0):
    1792              if self.bodyCharsOrig == self.initCharsOrig:
    1793                  self.reString = "[%s]+" % _escapeRegexRangeChars(self.initCharsOrig)
    1794              elif len(self.initCharsOrig) == 1:
    1795                  self.reString = "%s[%s]*" % \
    1796                                        (re.escape(self.initCharsOrig),
    1797                                        _escapeRegexRangeChars(self.bodyCharsOrig),)
    1798              else:
    1799                  self.reString = "[%s][%s]*" % \
    1800                                        (_escapeRegexRangeChars(self.initCharsOrig),
    1801                                        _escapeRegexRangeChars(self.bodyCharsOrig),)
    1802              if self.asKeyword:
    1803                  self.reString = r"\b"+self.reString+r"\b"
    1804              try:
    1805                  self.re = re.compile( self.reString )
    1806              except:
    1807                  self.re = None
    1808
    1809 -    def parseImpl( self, instring, loc, doActions=True ):
    1810          if self.re:
    1811              result = self.re.match(instring,loc)
    1812              if not result:
    1813                  raise ParseException(instring, loc, self.errmsg, self)
    1814
    1815              loc = result.end()
    1816              return loc, result.group()
    1817
    1818          if not(instring[ loc ] in self.initChars):
    1819              raise ParseException(instring, loc, self.errmsg, self)
    1820
    1821          start = loc
    1822          loc += 1
    1823          instrlen = len(instring)
    1824          bodychars = self.bodyChars
    1825          maxloc = start + self.maxLen
    1826          maxloc = min( maxloc, instrlen )
    1827          while loc < maxloc and instring[loc] in bodychars:
    1828              loc += 1
    1829
    1830          throwException = False
    1831          if loc - start < self.minLen:
    1832              throwException = True
    1833          if self.maxSpecified and loc < instrlen and instring[loc] in bodychars:
    1834              throwException = True
    1835          if self.asKeyword:
    1836              if (start>0 and instring[start-1] in bodychars) or (loc<instrlen and instring[loc] in bodychars):
    1837                  throwException = True
    1838
    1839          if throwException:
    1840              raise ParseException(instring, loc, self.errmsg, self)
    1841
    1842          return loc, instring[start:loc]
    1843
    1844 -    def __str__( self ):
    1845          try:
    1846              return super(Word,self).__str__()
    1847          except:
    1848              pass
    1849
    1850
    1851          if self.strRepr is None:
    1852
    1853              def charsAsStr(s):
    1854                  if len(s)>4:
    1855                      return s[:4]+"..."
    1856                  else:
    1857                      return s
    1858
    1859              if ( self.initCharsOrig != self.bodyCharsOrig ):
    1860                  self.strRepr = "W:(%s,%s)" % ( charsAsStr(self.initCharsOrig), charsAsStr(self.bodyCharsOrig) )
    1861              else:
    1862                  self.strRepr = "W:(%s)" % charsAsStr(self.initCharsOrig)
    1863
    1864          return self.strRepr
    1865
    1866
    1867 -class Regex(Token):
    1868      """Token for matching strings that match a given regular expression.
    1869         Defined with string specifying the regular expression in a form recognized by the inbuilt Python re module.
    1870      """
    1871      compiledREtype = type(re.compile("[A-Z]"))
    1872 -    def __init__( self, pattern, flags=0):
    1873          """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."""
    1874          super(Regex,self).__init__()
    1875
    1876          if isinstance(pattern, basestring):
    1877              if not pattern:
    1878                  warnings.warn("null string passed to Regex; use Empty() instead",
    1879                          SyntaxWarning, stacklevel=2)
    1880
    1881              self.pattern = pattern
    1882              self.flags = flags
    1883
    1884              try:
    1885                  self.re = re.compile(self.pattern, self.flags)
    1886                  self.reString = self.pattern
    1887              except sre_constants.error:
    1888                  warnings.warn("invalid pattern (%s) passed to Regex" % pattern,
    1889                      SyntaxWarning, stacklevel=2)
    1890                  raise
    1891
    1892          elif isinstance(pattern, Regex.compiledREtype):
    1893              self.re = pattern
    1894              self.pattern = \
    1895              self.reString = str(pattern)
    1896              self.flags = flags
    1897
    1898          else:
    1899              raise ValueError("Regex may only be constructed with a string or a compiled RE object")
    1900
    1901          self.name = _ustr(self)
    1902          self.errmsg = "Expected " + self.name
    1903          self.mayIndexError = False
    1904          self.mayReturnEmpty = True
    1905
    1906 -    def parseImpl( self, instring, loc, doActions=True ):
    1907          result = self.re.match(instring,loc)
    1908          if not result:
    1909              raise ParseException(instring, loc, self.errmsg, self)
    1910
    1911          loc = result.end()
    1912          d = result.groupdict()
    1913          ret = ParseResults(result.group())
    1914          if d:
    1915              for k in d:
    1916                  ret[k] = d[k]
    1917          return loc,ret
    1918
    1919 -    def __str__( self ):
    1920          try:
    1921              return super(Regex,self).__str__()
    1922          except:
    1923              pass
    1924
    1925          if self.strRepr is None:
    1926              self.strRepr = "Re:(%s)" % repr(self.pattern)
    1927
    1928          return self.strRepr
    1929
    1930
    1931 -class QuotedString(Token):
    1932      """Token for matching strings that are delimited by quoting characters.
    1933      """
    1934 -    def __init__( self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None):
    1935          """
    1936             Defined with the following parameters:
    1937              - quoteChar - string of one or more characters defining the quote delimiting string
    1938              - escChar - character to escape quotes, typically backslash (default=None)
    1939              - escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=None)
    1940              - multiline - boolean indicating whether quotes can span multiple lines (default=C{False})
    1941              - unquoteResults - boolean indicating whether the matched text should be unquoted (default=C{True})
    1942              - endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=C{None} => same as quoteChar)
    1943          """
    1944          super(QuotedString,self).__init__()
    1945
    1946          # remove white space from quote chars - wont work anyway
    1947          quoteChar = quoteChar.strip()
    1948          if not quoteChar:
    1949              warnings.warn("quoteChar cannot be the empty string",SyntaxWarning,stacklevel=2)
    1950              raise SyntaxError()
    1951
    1952          if endQuoteChar is None:
    1953              endQuoteChar = quoteChar
    1954          else:
    1955              endQuoteChar = endQuoteChar.strip()
    1956              if not endQuoteChar:
    1957                  warnings.warn("endQuoteChar cannot be the empty string",SyntaxWarning,stacklevel=2)
    1958                  raise SyntaxError()
    1959
    1960          self.quoteChar = quoteChar
    1961          self.quoteCharLen = len(quoteChar)
    1962          self.firstQuoteChar = quoteChar[0]
    1963          self.endQuoteChar = endQuoteChar
    1964          self.endQuoteCharLen = len(endQuoteChar)
    1965          self.escChar = escChar
    1966          self.escQuote = escQuote
    1967          self.unquoteResults = unquoteResults
    1968
    1969          if multiline:
    1970              self.flags = re.MULTILINE | re.DOTALL
    1971              self.pattern = r'%s(?:[^%s%s]' % \
    1972                  ( re.escape(self.quoteChar),
    1973                    _escapeRegexRangeChars(self.endQuoteChar[0]),
    1974                    (escChar is not None and _escapeRegexRangeChars(escChar) or '') )
    1975          else:
    1976              self.flags = 0
    1977              self.pattern = r'%s(?:[^%s\n\r%s]' % \
    1978                  ( re.escape(self.quoteChar),
    1979                    _escapeRegexRangeChars(self.endQuoteChar[0]),
    1980                    (escChar is not None and _escapeRegexRangeChars(escChar) or '') )
    1981          if len(self.endQuoteChar) > 1:
    1982              self.pattern += (
    1983                  '|(?:' + ')|(?:'.join("%s[^%s]" % (re.escape(self.endQuoteChar[:i]),
    1984                                                 _escapeRegexRangeChars(self.endQuoteChar[i]))
    1985                                      for i in range(len(self.endQuoteChar)-1,0,-1)) + ')'
    1986                  )
    1987          if escQuote:
    1988              self.pattern += (r'|(?:%s)' % re.escape(escQuote))
    1989          if escChar:
    1990              self.pattern += (r'|(?:%s.)' % re.escape(escChar))
    1991              self.escCharReplacePattern = re.escape(self.escChar)+"(.)"
    1992          self.pattern += (r')*%s' % re.escape(self.endQuoteChar))
    1993
    1994          try:
    1995              self.re = re.compile(self.pattern, self.flags)
    1996              self.reString = self.pattern
    1997          except sre_constants.error:
    1998              warnings.warn("invalid pattern (%s) passed to Regex" % self.pattern,
    1999                  SyntaxWarning, stacklevel=2)
    2000              raise
    2001
    2002          self.name = _ustr(self)
    2003          self.errmsg = "Expected " + self.name
    2004          self.mayIndexError = False
    2005          self.mayReturnEmpty = True
    2006
    2007 -    def parseImpl( self, instring, loc, doActions=True ):
    2008          result = instring[loc] == self.firstQuoteChar and self.re.match(instring,loc) or None
    2009          if not result:
    2010              raise ParseException(instring, loc, self.errmsg, self)
    2011
    2012          loc = result.end()
    2013          ret = result.group()
    2014
    2015          if self.unquoteResults:
    2016
    2017              # strip off quotes
    2018              ret = ret[self.quoteCharLen:-self.endQuoteCharLen]
    2019
    2020              if isinstance(ret,basestring):
    2021                  # replace escaped characters
    2022                  if self.escChar:
    2023                      ret = re.sub(self.escCharReplacePattern,"\g<1>",ret)
    2024
    2025                  # replace escaped quotes
    2026                  if self.escQuote:
    2027                      ret = ret.replace(self.escQuote, self.endQuoteChar)
    2028
    2029          return loc, ret
    2030
    2031 -    def __str__( self ):
    2032          try:
    2033              return super(QuotedString,self).__str__()
    2034          except:
    2035              pass
    2036
    2037          if self.strRepr is None:
    2038              self.strRepr = "quoted string, starting with %s ending with %s" % (self.quoteChar, self.endQuoteChar)
    2039
    2040          return self.strRepr
    2041
    2042
    2043 -class CharsNotIn(Token):
    2044      """Token for matching words composed of characters *not* in a given set.
    2045         Defined with string containing all disallowed characters, and an optional
    2046         minimum, maximum, and/or exact length.  The default value for C{min} is 1 (a
    2047         minimum value < 1 is not valid); the default values for C{max} and C{exact}
    2048         are 0, meaning no maximum or exact length restriction.
    2049      """
    2050 -    def __init__( self, notChars, min=1, max=0, exact=0 ):
    2051          super(CharsNotIn,self).__init__()
    2052          self.skipWhitespace = False
    2053          self.notChars = notChars
    2054
    2055          if min < 1:
    2056              raise ValueError("cannot specify a minimum length < 1; use Optional(CharsNotIn()) if zero-length char group is permitted")
    2057
    2058          self.minLen = min
    2059
    2060          if max > 0:
    2061              self.maxLen = max
    2062          else:
    2063              self.maxLen = _MAX_INT
    2064
    2065          if exact > 0:
    2066              self.maxLen = exact
    2067              self.minLen = exact
    2068
    2069          self.name = _ustr(self)
    2070          self.errmsg = "Expected " + self.name
    2071          self.mayReturnEmpty = ( self.minLen == 0 )
    2072          self.mayIndexError = False
    2073
    2074 -    def parseImpl( self, instring, loc, doActions=True ):
    2075          if instring[loc] in self.notChars:
    2076              raise ParseException(instring, loc, self.errmsg, self)
    2077
    2078          start = loc
    2079          loc += 1
    2080          notchars = self.notChars
    2081          maxlen = min( start+self.maxLen, len(instring) )
    2082          while loc < maxlen and \
    2083                (instring[loc] not in notchars):
    2084              loc += 1
    2085
    2086          if loc - start < self.minLen:
    2087              raise ParseException(instring, loc, self.errmsg, self)
    2088
    2089          return loc, instring[start:loc]
    2090
    2091 -    def __str__( self ):
    2092          try:
    2093              return super(CharsNotIn, self).__str__()
    2094          except:
    2095              pass
    2096
    2097          if self.strRepr is None:
    2098              if len(self.notChars) > 4:
    2099                  self.strRepr = "!W:(%s...)" % self.notChars[:4]
    2100              else:
    2101                  self.strRepr = "!W:(%s)" % self.notChars
    2102
    2103          return self.strRepr
    2104
    2105 -class White(Token):
    2106      """Special matching class for matching whitespace.  Normally, whitespace is ignored
    2107         by pyparsing grammars.  This class is included when some whitespace structures
    2108         are significant.  Define with a string containing the whitespace characters to be
    2109         matched; default is C{" \\t\\r\\n"}.  Also takes optional C{min}, C{max}, and C{exact} arguments,
    2110         as defined for the C{L{Word}} class."""
    2111      whiteStrs = {
    2112          " " : "<SPC>",
    2113          "\t": "<TAB>",
    2114          "\n": "<LF>",
    2115          "\r": "<CR>",
    2116          "\f": "<FF>",
    2117          }
    2118 -    def __init__(self, ws=" \t\r\n", min=1, max=0, exact=0):
    2119          super(White,self).__init__()
    2120          self.matchWhite = ws
    2121          self.setWhitespaceChars( "".join(c for c in self.whiteChars if c not in self.matchWhite) )
    2122          #~ self.leaveWhitespace()
    2123          self.name = ("".join(White.whiteStrs[c] for c in self.matchWhite))
    2124          self.mayReturnEmpty = True
    2125          self.errmsg = "Expected " + self.name
    2126
    2127          self.minLen = min
    2128
    2129          if max > 0:
    2130              self.maxLen = max
    2131          else:
    2132              self.maxLen = _MAX_INT
    2133
    2134          if exact > 0:
    2135              self.maxLen = exact
    2136              self.minLen = exact
    2137
    2138 -    def parseImpl( self, instring, loc, doActions=True ):
    2139          if not(instring[ loc ] in self.matchWhite):
    2140              raise ParseException(instring, loc, self.errmsg, self)
    2141          start = loc
    2142          loc += 1
    2143          maxloc = start + self.maxLen
    2144          maxloc = min( maxloc, len(instring) )
    2145          while loc < maxloc and instring[loc] in self.matchWhite:
    2146              loc += 1
    2147
    2148          if loc - start < self.minLen:
    2149              raise ParseException(instring, loc, self.errmsg, self)
    2150
    2151          return loc, instring[start:loc]
    2152
    2153
    2154 -class _PositionToken(Token):
    2155 -    def __init__( self ):
    2156          super(_PositionToken,self).__init__()
    2157          self.name=self.__class__.__name__
    2158          self.mayReturnEmpty = True
    2159          self.mayIndexError = False
    2160
    2161 -class GoToColumn(_PositionToken):
    2162      """Token to advance to a specific column of input text; useful for tabular report scraping."""
    2163 -    def __init__( self, colno ):
    2164          super(GoToColumn,self).__init__()
    2165          self.col = colno
    2166
    2167 -    def preParse( self, instring, loc ):
    2168          if col(loc,instring) != self.col:
    2169              instrlen = len(instring)
    2170              if self.ignoreExprs:
    2171                  loc = self._skipIgnorables( instring, loc )
    2172              while loc < instrlen and instring[loc].isspace() and col( loc, instring ) != self.col :
    2173                  loc += 1
    2174          return loc
    2175
    2176 -    def parseImpl( self, instring, loc, doActions=True ):
    2177          thiscol = col( loc, instring )
    2178          if thiscol > self.col:
    2179              raise ParseException( instring, loc, "Text not in expected column", self )
    2180          newloc = loc + self.col - thiscol
    2181          ret = instring[ loc: newloc ]
    2182          return newloc, ret
    2183
    2184 -class LineStart(_PositionToken):
    2185      """Matches if current position is at the beginning of a line within the parse string"""
    2186 -    def __init__( self ):
    2187          super(LineStart,self).__init__()
    2188          self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") )
    2189          self.errmsg = "Expected start of line"
    2190
    2191 -    def preParse( self, instring, loc ):
    2192          preloc = super(LineStart,self).preParse(instring,loc)
    2193          if instring[preloc] == "\n":
    2194              loc += 1
    2195          return loc
    2196
    2197 -    def parseImpl( self, instring, loc, doActions=True ):
    2198          if not( loc==0 or
    2199              (loc == self.preParse( instring, 0 )) or
    2200              (instring[loc-1] == "\n") ): #col(loc, instring) != 1:
    2201              raise ParseException(instring, loc, self.errmsg, self)
    2202          return loc, []
    2203
    2204 -class LineEnd(_PositionToken):
    2205      """Matches if current position is at the end of a line within the parse string"""
    2206 -    def __init__( self ):
    2207          super(LineEnd,self).__init__()
    2208          self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") )
    2209          self.errmsg = "Expected end of line"
    2210
    2211 -    def parseImpl( self, instring, loc, doActions=True ):
    2212          if loc<len(instring):
    2213              if instring[loc] == "\n":
    2214                  return loc+1, "\n"
    2215              else:
    2216                  raise ParseException(instring, loc, self.errmsg, self)
    2217          elif loc == len(instring):
    2218              return loc+1, []
    2219          else:
    2220              raise ParseException(instring, loc, self.errmsg, self)
    2221
    2222 -class StringStart(_PositionToken):
    2223      """Matches if current position is at the beginning of the parse string"""
    2224 -    def __init__( self ):
    2225          super(StringStart,self).__init__()
    2226          self.errmsg = "Expected start of text"
    2227
    2228 -    def parseImpl( self, instring, loc, doActions=True ):
    2229          if loc != 0:
    2230              # see if entire string up to here is just whitespace and ignoreables
    2231              if loc != self.preParse( instring, 0 ):
    2232                  raise ParseException(instring, loc, self.errmsg, self)
    2233          return loc, []
    2234
    2235 -class StringEnd(_PositionToken):
    2236      """Matches if current position is at the end of the parse string"""
    2237 -    def __init__( self ):
    2238          super(StringEnd,self).__init__()
    2239          self.errmsg = "Expected end of text"
    2240
    2241 -    def parseImpl( self, instring, loc, doActions=True ):
    2242          if loc < len(instring):
    2243              raise ParseException(instring, loc, self.errmsg, self)
    2244          elif loc == len(instring):
    2245              return loc+1, []
    2246          elif loc > len(instring):
    2247              return loc, []
    2248          else:
    2249              raise ParseException(instring, loc, self.errmsg, self)
    2250
    2251 -class WordStart(_PositionToken):
    2252      """Matches if the current position is at the beginning of a Word, and
    2253         is not preceded by any character in a given set of C{wordChars}
    2254         (default=C{printables}). To emulate the C{\b} behavior of regular expressions,
    2255         use C{WordStart(alphanums)}. C{WordStart} will also match at the beginning of
    2256         the string being parsed, or at the beginning of a line.
    2257      """
    2258 -    def __init__(self, wordChars = printables):
    2259          super(WordStart,self).__init__()
    2260          self.wordChars = set(wordChars)
    2261          self.errmsg = "Not at the start of a word"
    2262
    2263 -    def parseImpl(self, instring, loc, doActions=True ):
    2264          if loc != 0:
    2265              if (instring[loc-1] in self.wordChars or
    2266                  instring[loc] not in self.wordChars):
    2267                  raise ParseException(instring, loc, self.errmsg, self)
    2268          return loc, []
    2269
    2270 -class WordEnd(_PositionToken):
    2271      """Matches if the current position is at the end of a Word, and
    2272         is not followed by any character in a given set of C{wordChars}
    2273         (default=C{printables}). To emulate the C{\b} behavior of regular expressions,
    2274         use C{WordEnd(alphanums)}. C{WordEnd} will also match at the end of
    2275         the string being parsed, or at the end of a line.
    2276      """
    2277 -    def __init__(self, wordChars = printables):
    2278          super(WordEnd,self).__init__()
    2279          self.wordChars = set(wordChars)
    2280          self.skipWhitespace = False
    2281          self.errmsg = "Not at the end of a word"
    2282
    2283 -    def parseImpl(self, instring, loc, doActions=True ):
    2284          instrlen = len(instring)
    2285          if instrlen>0 and loc<instrlen:
    2286              if (instring[loc] in self.wordChars or
    2287                  instring[loc-1] not in self.wordChars):
    2288                  raise ParseException(instring, loc, self.errmsg, self)
    2289          return loc, []
    2290
    2291
    2292 -class ParseExpression(ParserElement):
    2293      """Abstract subclass of ParserElement, for combining and post-processing parsed tokens."""
    2294 -    def __init__( self, exprs, savelist = False ):
    2295          super(ParseExpression,self).__init__(savelist)
    2296          if isinstance( exprs, _generatorType ):
    2297              exprs = list(exprs)
    2298
    2299          if isinstance( exprs, basestring ):
    2300              self.exprs = [ Literal( exprs ) ]
    2301          elif isinstance( exprs, collections.Sequence ):
    2302              # if sequence of strings provided, wrap with Literal
    2303              if all(isinstance(expr, basestring) for expr in exprs):
    2304                  exprs = map(Literal, exprs)
    2305              self.exprs = list(exprs)
    2306          else:
    2307              try:
    2308                  self.exprs = list( exprs )
    2309              except TypeError:
    2310                  self.exprs = [ exprs ]
    2311          self.callPreparse = False
    2312
    2313 -    def __getitem__( self, i ):
    2314          return self.exprs[i]
    2315
    2316 -    def append( self, other ):
    2317          self.exprs.append( other )
    2318          self.strRepr = None
    2319          return self
    2320
    2321 -    def leaveWhitespace( self ):
    2322          """Extends C{leaveWhitespace} defined in base class, and also invokes C{leaveWhitespace} on
    2323             all contained expressions."""
    2324          self.skipWhitespace = False
    2325          self.exprs = [ e.copy() for e in self.exprs ]
    2326          for e in self.exprs:
    2327              e.leaveWhitespace()
    2328          return self
    2329
    2330 -    def ignore( self, other ):
    2331          if isinstance( other, Suppress ):
    2332              if other not in self.ignoreExprs:
    2333                  super( ParseExpression, self).ignore( other )
    2334                  for e in self.exprs:
    2335                      e.ignore( self.ignoreExprs[-1] )
    2336          else:
    2337              super( ParseExpression, self).ignore( other )
    2338              for e in self.exprs:
    2339                  e.ignore( self.ignoreExprs[-1] )
    2340          return self
    2341
    2342 -    def __str__( self ):
    2343          try:
    2344              return super(ParseExpression,self).__str__()
    2345          except:
    2346              pass
    2347
    2348          if self.strRepr is None:
    2349              self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.exprs) )
    2350          return self.strRepr
    2351
    2352 -    def streamline( self ):
    2353          super(ParseExpression,self).streamline()
    2354
    2355          for e in self.exprs:
    2356              e.streamline()
    2357
    2358          # collapse nested And's of the form And( And( And( a,b), c), d) to And( a,b,c,d )
    2359          # but only if there are no parse actions or resultsNames on the nested And's
    2360          # (likewise for Or's and MatchFirst's)
    2361          if ( len(self.exprs) == 2 ):
    2362              other = self.exprs[0]
    2363              if ( isinstance( other, self.__class__ ) and
    2364                    not(other.parseAction) and
    2365                    other.resultsName is None and
    2366                    not other.debug ):
    2367                  self.exprs = other.exprs[:] + [ self.exprs[1] ]
    2368                  self.strRepr = None
    2369                  self.mayReturnEmpty |= other.mayReturnEmpty
    2370                  self.mayIndexError  |= other.mayIndexError
    2371
    2372              other = self.exprs[-1]
    2373              if ( isinstance( other, self.__class__ ) and
    2374                    not(other.parseAction) and
    2375                    other.resultsName is None and
    2376                    not other.debug ):
    2377                  self.exprs = self.exprs[:-1] + other.exprs[:]
    2378                  self.strRepr = None
    2379                  self.mayReturnEmpty |= other.mayReturnEmpty
    2380                  self.mayIndexError  |= other.mayIndexError
    2381
    2382          self.errmsg = "Expected " + _ustr(self)
    2383
    2384          return self
    2385
    2386 -    def setResultsName( self, name, listAllMatches=False ):
    2387          ret = super(ParseExpression,self).setResultsName(name,listAllMatches)
    2388          return ret
    2389
    2390 -    def validate( self, validateTrace=[] ):
    2391          tmp = validateTrace[:]+[self]
    2392          for e in self.exprs:
    2393              e.validate(tmp)
    2394          self.checkRecursion( [] )
    2395
    2396 -    def copy(self):
    2397          ret = super(ParseExpression,self).copy()
    2398          ret.exprs = [e.copy() for e in self.exprs]
    2399          return ret
    2400
    2401 -class And(ParseExpression):
    2402      """Requires all given C{ParseExpression}s to be found in the given order.
    2403         Expressions may be separated by whitespace.
    2404         May be constructed using the C{'+'} operator.
    2405      """
    2406
    2407 -    class _ErrorStop(Empty):
    2408 -        def __init__(self, *args, **kwargs):
    2409              super(And._ErrorStop,self).__init__(*args, **kwargs)
    2410              self.name = '-'
    2411              self.leaveWhitespace()
    2412
    2413 -    def __init__( self, exprs, savelist = True ):
    2414          super(And,self).__init__(exprs, savelist)
    2415          self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs)
    2416          self.setWhitespaceChars( self.exprs[0].whiteChars )
    2417          self.skipWhitespace = self.exprs[0].skipWhitespace
    2418          self.callPreparse = True
    2419
    2420 -    def parseImpl( self, instring, loc, doActions=True ):
    2421          # pass False as last arg to _parse for first element, since we already
    2422          # pre-parsed the string as part of our And pre-parsing
    2423          loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False )
    2424          errorStop = False
    2425          for e in self.exprs[1:]:
    2426              if isinstance(e, And._ErrorStop):
    2427                  errorStop = True
    2428                  continue
    2429              if errorStop:
    2430                  try:
    2431                      loc, exprtokens = e._parse( instring, loc, doActions )
    2432                  except ParseSyntaxException:
    2433                      raise
    2434                  except ParseBaseException as pe:
    2435                      pe.__traceback__ = None
    2436                      raise ParseSyntaxException(pe)
    2437                  except IndexError:
    2438                      raise ParseSyntaxException( ParseException(instring, len(instring), self.errmsg, self) )
    2439              else:
    2440                  loc, exprtokens = e._parse( instring, loc, doActions )
    2441              if exprtokens or exprtokens.haskeys():
    2442                  resultlist += exprtokens
    2443          return loc, resultlist
    2444
    2445 -    def __iadd__(self, other ):
    2446          if isinstance( other, basestring ):
    2447              other = Literal( other )
    2448          return self.append( other ) #And( [ self, other ] )
    2449
    2450 -    def checkRecursion( self, parseElementList ):
    2451          subRecCheckList = parseElementList[:] + [ self ]
    2452          for e in self.exprs:
    2453              e.checkRecursion( subRecCheckList )
    2454              if not e.mayReturnEmpty:
    2455                  break
    2456
    2457 -    def __str__( self ):
    2458          if hasattr(self,"name"):
    2459              return self.name
    2460
    2461          if self.strRepr is None:
    2462              self.strRepr = "{" + " ".join(_ustr(e) for e in self.exprs) + "}"
    2463
    2464          return self.strRepr
    2465
    2466
    2467 -class Or(ParseExpression):
    2468      """Requires that at least one C{ParseExpression} is found.
    2469         If two expressions match, the expression that matches the longest string will be used.
    2470         May be constructed using the C{'^'} operator.
    2471      """
    2472 -    def __init__( self, exprs, savelist = False ):
    2473          super(Or,self).__init__(exprs, savelist)
    2474          if self.exprs:
    2475              self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs)
    2476          else:
    2477              self.mayReturnEmpty = True
    2478
    2479 -    def parseImpl( self, instring, loc, doActions=True ):
    2480          maxExcLoc = -1
    2481          maxException = None
    2482          matches = []
    2483          for e in self.exprs:
    2484              try:
    2485                  loc2 = e.tryParse( instring, loc )
    2486              except ParseException as err:
    2487                  err.__traceback__ = None
    2488                  if err.loc > maxExcLoc:
    2489                      maxException = err
    2490                      maxExcLoc = err.loc
    2491              except IndexError:
    2492                  if len(instring) > maxExcLoc:
    2493                      maxException = ParseException(instring,len(instring),e.errmsg,self)
    2494                      maxExcLoc = len(instring)
    2495              else:
    2496                  # save match among all matches, to retry longest to shortest
    2497                  matches.append((loc2, e))
    2498
    2499          if matches:
    2500              matches.sort(key=lambda x: -x[0])
    2501              for _,e in matches:
    2502                  try:
    2503                      return e._parse( instring, loc, doActions )
    2504                  except ParseException as err:
    2505                      err.__traceback__ = None
    2506                      if err.loc > maxExcLoc:
    2507                          maxException = err
    2508                          maxExcLoc = err.loc
    2509
    2510          if maxException is not None:
    2511              maxException.msg = self.errmsg
    2512              raise maxException
    2513          else:
    2514              raise ParseException(instring, loc, "no defined alternatives to match", self)
    2515
    2516
    2517 -    def __ixor__(self, other ):
    2518          if isinstance( other, basestring ):
    2519              other = ParserElement.literalStringClass( other )
    2520          return self.append( other ) #Or( [ self, other ] )
    2521
    2522 -    def __str__( self ):
    2523          if hasattr(self,"name"):
    2524              return self.name
    2525
    2526          if self.strRepr is None:
    2527              self.strRepr = "{" + " ^ ".join(_ustr(e) for e in self.exprs) + "}"
    2528
    2529          return self.strRepr
    2530
    2531 -    def checkRecursion( self, parseElementList ):
    2532          subRecCheckList = parseElementList[:] + [ self ]
    2533          for e in self.exprs:
    2534              e.checkRecursion( subRecCheckList )
    2535
    2536
    2537 -class MatchFirst(ParseExpression):
    2538      """Requires that at least one C{ParseExpression} is found.
    2539         If two expressions match, the first one listed is the one that will match.
    2540         May be constructed using the C{'|'} operator.
    2541      """
    2542 -    def __init__( self, exprs, savelist = False ):
    2543          super(MatchFirst,self).__init__(exprs, savelist)
    2544          if self.exprs:
    2545              self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs)
    2546          else:
    2547              self.mayReturnEmpty = True
    2548
    2549 -    def parseImpl( self, instring, loc, doActions=True ):
    2550          maxExcLoc = -1
    2551          maxException = None
    2552          for e in self.exprs:
    2553              try:
    2554                  ret = e._parse( instring, loc, doActions )
    2555                  return ret
    2556              except ParseException as err:
    2557                  if err.loc > maxExcLoc:
    2558                      maxException = err
    2559                      maxExcLoc = err.loc
    2560              except IndexError:
    2561                  if len(instring) > maxExcLoc:
    2562                      maxException = ParseException(instring,len(instring),e.errmsg,self)
    2563                      maxExcLoc = len(instring)
    2564
    2565          # only got here if no expression matched, raise exception for match that made it the furthest
    2566          else:
    2567              if maxException is not None:
    2568                  maxException.msg = self.errmsg
    2569                  raise maxException
    2570              else:
    2571                  raise ParseException(instring, loc, "no defined alternatives to match", self)
    2572
    2573 -    def __ior__(self, other ):
    2574          if isinstance( other, basestring ):
    2575              other = ParserElement.literalStringClass( other )
    2576          return self.append( other ) #MatchFirst( [ self, other ] )
    2577
    2578 -    def __str__( self ):
    2579          if hasattr(self,"name"):
    2580              return self.name
    2581
    2582          if self.strRepr is None:
    2583              self.strRepr = "{" + " | ".join(_ustr(e) for e in self.exprs) + "}"
    2584
    2585          return self.strRepr
    2586
    2587 -    def checkRecursion( self, parseElementList ):
    2588          subRecCheckList = parseElementList[:] + [ self ]
    2589          for e in self.exprs:
    2590              e.checkRecursion( subRecCheckList )
    2591
    2592
    2593 -class Each(ParseExpression):
    2594      """Requires all given C{ParseExpression}s to be found, but in any order.
    2595         Expressions may be separated by whitespace.
    2596         May be constructed using the C{'&'} operator.
    2597      """
    2598 -    def __init__( self, exprs, savelist = True ):
    2599          super(Each,self).__init__(exprs, savelist)
    2600          self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs)
    2601          self.skipWhitespace = True
    2602          self.initExprGroups = True
    2603
    2604 -    def parseImpl( self, instring, loc, doActions=True ):
    2605          if self.initExprGroups:
    2606              self.opt1map = dict((id(e.expr),e) for e in self.exprs if isinstance(e,Optional))
    2607              opt1 = [ e.expr for e in self.exprs if isinstance(e,Optional) ]
    2608              opt2 = [ e for e in self.exprs if e.mayReturnEmpty and not isinstance(e,Optional)]
    2609              self.optionals = opt1 + opt2
    2610              self.multioptionals = [ e.expr for e in self.exprs if isinstance(e,ZeroOrMore) ]
    2611              self.multirequired = [ e.expr for e in self.exprs if isinstance(e,OneOrMore) ]
    2612              self.required = [ e for e in self.exprs if not isinstance(e,(Optional,ZeroOrMore,OneOrMore)) ]
    2613              self.required += self.multirequired
    2614              self.initExprGroups = False
    2615          tmpLoc = loc
    2616          tmpReqd = self.required[:]
    2617          tmpOpt  = self.optionals[:]
    2618          matchOrder = []
    2619
    2620          keepMatching = True
    2621          while keepMatching:
    2622              tmpExprs = tmpReqd + tmpOpt + self.multioptionals + self.multirequired
    2623              failed = []
    2624              for e in tmpExprs:
    2625                  if e.canParseNext(instring, tmpLoc):
    2626                      matchOrder.append(self.opt1map.get(id(e),e))
    2627                      if e in tmpReqd:
    2628                          tmpReqd.remove(e)
    2629                      elif e in tmpOpt:
    2630                          tmpOpt.remove(e)
    2631                  else:
    2632                      failed.append(e)
    2633              if len(failed) == len(tmpExprs):
    2634                  keepMatching = False
    2635
    2636          if tmpReqd:
    2637              missing = ", ".join(_ustr(e) for e in tmpReqd)
    2638              raise ParseException(instring,loc,"Missing one or more required elements (%s)" % missing )
    2639
    2640          # add any unmatched Optionals, in case they have default values defined
    2641          matchOrder += [e for e in self.exprs if isinstance(e,Optional) and e.expr in tmpOpt]
    2642
    2643          resultlist = []
    2644          for e in matchOrder:
    2645              loc,results = e._parse(instring,loc,doActions)
    2646              resultlist.append(results)
    2647
    2648          finalResults = ParseResults()
    2649          for r in resultlist:
    2650              dups = {}
    2651              for k in r.keys():
    2652                  if k in finalResults:
    2653                      tmp = ParseResults(finalResults[k])
    2654                      tmp += ParseResults(r[k])
    2655                      dups[k] = tmp
    2656              finalResults += ParseResults(r)
    2657              for k,v in dups.items():
    2658                  finalResults[k] = v
    2659          return loc, finalResults
    2660
    2661 -    def __str__( self ):
    2662          if hasattr(self,"name"):
    2663              return self.name
    2664
    2665          if self.strRepr is None:
    2666              self.strRepr = "{" + " & ".join(_ustr(e) for e in self.exprs) + "}"
    2667
    2668          return self.strRepr
    2669
    2670 -    def checkRecursion( self, parseElementList ):
    2671          subRecCheckList = parseElementList[:] + [ self ]
    2672          for e in self.exprs:
    2673              e.checkRecursion( subRecCheckList )
    2674
    2675
    2676 -class ParseElementEnhance(ParserElement):
    2677      """Abstract subclass of C{ParserElement}, for combining and post-processing parsed tokens."""
    2678 -    def __init__( self, expr, savelist=False ):
    2679          super(ParseElementEnhance,self).__init__(savelist)
    2680          if isinstance( expr, basestring ):
    2681              expr = Literal(expr)
    2682          self.expr = expr
    2683          self.strRepr = None
    2684          if expr is not None:
    2685              self.mayIndexError = expr.mayIndexError
    2686              self.mayReturnEmpty = expr.mayReturnEmpty
    2687              self.setWhitespaceChars( expr.whiteChars )
    2688              self.skipWhitespace = expr.skipWhitespace
    2689              self.saveAsList = expr.saveAsList
    2690              self.callPreparse = expr.callPreparse
    2691              self.ignoreExprs.extend(expr.ignoreExprs)
    2692
    2693 -    def parseImpl( self, instring, loc, doActions=True ):
    2694          if self.expr is not None:
    2695              return self.expr._parse( instring, loc, doActions, callPreParse=False )
    2696          else:
    2697              raise ParseException("",loc,self.errmsg,self)
    2698
    2699 -    def leaveWhitespace( self ):
    2700          self.skipWhitespace = False
    2701          self.expr = self.expr.copy()
    2702          if self.expr is not None:
    2703              self.expr.leaveWhitespace()
    2704          return self
    2705
    2706 -    def ignore( self, other ):
    2707          if isinstance( other, Suppress ):
    2708              if other not in self.ignoreExprs:
    2709                  super( ParseElementEnhance, self).ignore( other )
    2710                  if self.expr is not None:
    2711                      self.expr.ignore( self.ignoreExprs[-1] )
    2712          else:
    2713              super( ParseElementEnhance, self).ignore( other )
    2714              if self.expr is not None:
    2715                  self.expr.ignore( self.ignoreExprs[-1] )
    2716          return self
    2717
    2718 -    def streamline( self ):
    2719          super(ParseElementEnhance,self).streamline()
    2720          if self.expr is not None:
    2721              self.expr.streamline()
    2722          return self
    2723
    2724 -    def checkRecursion( self, parseElementList ):
    2725          if self in parseElementList:
    2726              raise RecursiveGrammarException( parseElementList+[self] )
    2727          subRecCheckList = parseElementList[:] + [ self ]
    2728          if self.expr is not None:
    2729              self.expr.checkRecursion( subRecCheckList )
    2730
    2731 -    def validate( self, validateTrace=[] ):
    2732          tmp = validateTrace[:]+[self]
    2733          if self.expr is not None:
    2734              self.expr.validate(tmp)
    2735          self.checkRecursion( [] )
    2736
    2737 -    def __str__( self ):
    2738          try:
    2739              return super(ParseElementEnhance,self).__str__()
    2740          except:
    2741              pass
    2742
    2743          if self.strRepr is None and self.expr is not None:
    2744              self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.expr) )
    2745          return self.strRepr
    2746
    2747
    2748 -class FollowedBy(ParseElementEnhance):
    2749      """Lookahead matching of the given parse expression.  C{FollowedBy}
    2750      does *not* advance the parsing position within the input string, it only
    2751      verifies that the specified parse expression matches at the current
    2752      position.  C{FollowedBy} always returns a null token list."""
    2753 -    def __init__( self, expr ):
    2754          super(FollowedBy,self).__init__(expr)
    2755          self.mayReturnEmpty = True
    2756
    2757 -    def parseImpl( self, instring, loc, doActions=True ):
    2758          self.expr.tryParse( instring, loc )
    2759          return loc, []
    2760
    2761
    2762 -class NotAny(ParseElementEnhance):
    2763      """Lookahead to disallow matching with the given parse expression.  C{NotAny}
    2764      does *not* advance the parsing position within the input string, it only
    2765      verifies that the specified parse expression does *not* match at the current
    2766      position.  Also, C{NotAny} does *not* skip over leading whitespace. C{NotAny}
    2767      always returns a null token list.  May be constructed using the '~' operator."""
    2768 -    def __init__( self, expr ):
    2769          super(NotAny,self).__init__(expr)
    2770          #~ self.leaveWhitespace()
    2771          self.skipWhitespace = False  # do NOT use self.leaveWhitespace(), don't want to propagate to exprs
    2772          self.mayReturnEmpty = True
    2773          self.errmsg = "Found unwanted token, "+_ustr(self.expr)
    2774
    2775 -    def parseImpl( self, instring, loc, doActions=True ):
    2776          if self.expr.canParseNext(instring, loc):
    2777              raise ParseException(instring, loc, self.errmsg, self)
    2778          return loc, []
    2779
    2780 -    def __str__( self ):
    2781          if hasattr(self,"name"):
    2782              return self.name
    2783
    2784          if self.strRepr is None:
    2785              self.strRepr = "~{" + _ustr(self.expr) + "}"
    2786
    2787          return self.strRepr
    2788
    2789
    2790 -class OneOrMore(ParseElementEnhance):
    2791      """Repetition of one or more of the given expression.
    2792
    2793         Parameters:
    2794          - expr - expression that must match one or more times
    2795          - stopOn - (default=None) - expression for a terminating sentinel
    2796            (only required if the sentinel would ordinarily match the repetition
    2797            expression)
    2798      """
    2799 -    def __init__( self, expr, stopOn=None):
    2800          super(OneOrMore, self).__init__(expr)
    2801          ender = stopOn
    2802          if isinstance(ender, basestring):
    2803              ender = Literal(ender)
    2804          self.not_ender = ~ender if ender is not None else None
    2805
    2806 -    def parseImpl( self, instring, loc, doActions=True ):
    2807          self_expr_parse = self.expr._parse
    2808          self_skip_ignorables = self._skipIgnorables
    2809          check_ender = self.not_ender is not None
    2810          if check_ender:
    2811              try_not_ender = self.not_ender.tryParse
    2812
    2813          # must be at least one (but first see if we are the stopOn sentinel;
    2814          # if so, fail)
    2815          if check_ender:
    2816              try_not_ender(instring, loc)
    2817          loc, tokens = self_expr_parse( instring, loc, doActions, callPreParse=False )
    2818          try:
    2819              hasIgnoreExprs = (not not self.ignoreExprs)
    2820              while 1:
    2821                  if check_ender:
    2822                      try_not_ender(instring, loc)
    2823                  if hasIgnoreExprs:
    2824                      preloc = self_skip_ignorables( instring, loc )
    2825                  else:
    2826                      preloc = loc
    2827                  loc, tmptokens = self_expr_parse( instring, preloc, doActions )
    2828                  if tmptokens or tmptokens.haskeys():
    2829                      tokens += tmptokens
    2830          except (ParseException,IndexError):
    2831              pass
    2832
    2833          return loc, tokens
    2834
    2835 -    def __str__( self ):
    2836          if hasattr(self,"name"):
    2837              return self.name
    2838
    2839          if self.strRepr is None:
    2840              self.strRepr = "{" + _ustr(self.expr) + "}..."
    2841
    2842          return self.strRepr
    2843
    2844 -    def setResultsName( self, name, listAllMatches=False ):
    2845          ret = super(OneOrMore,self).setResultsName(name,listAllMatches)
    2846          ret.saveAsList = True
    2847          return ret
    2848
    2849 -class ZeroOrMore(OneOrMore):
    2850      """Optional repetition of zero or more of the given expression.
    2851
    2852         Parameters:
    2853          - expr - expression that must match zero or more times
    2854          - stopOn - (default=None) - expression for a terminating sentinel
    2855            (only required if the sentinel would ordinarily match the repetition
    2856            expression)
    2857      """
    2858 -    def __init__( self, expr, stopOn=None):
    2859          super(ZeroOrMore,self).__init__(expr, stopOn=stopOn)
    2860          self.mayReturnEmpty = True
    2861
    2862 -    def parseImpl( self, instring, loc, doActions=True ):
    2863          try:
    2864              return super(ZeroOrMore, self).parseImpl(instring, loc, doActions)
    2865          except (ParseException,IndexError):
    2866              return loc, []
    2867
    2868 -    def __str__( self ):
    2869          if hasattr(self,"name"):
    2870              return self.name
    2871
    2872          if self.strRepr is None:
    2873              self.strRepr = "[" + _ustr(self.expr) + "]..."
    2874
    2875          return self.strRepr
    2876
    2877 -class _NullToken(object):
    2878 -    def __bool__(self):
    2879          return False
    2880      __nonzero__ = __bool__
    2881 -    def __str__(self):
    2882          return ""
    2883
    2884  _optionalNotMatched = _NullToken()
    2885 -class Optional(ParseElementEnhance):
    2886      """Optional matching of the given expression.
    2887
    2888         Parameters:
    2889          - expr - expression that must match zero or more times
    2890          - default (optional) - value to be returned if the optional expression
    2891            is not found.
    2892      """
    2893 -    def __init__( self, expr, default=_optionalNotMatched ):
    2894          super(Optional,self).__init__( expr, savelist=False )
    2895          self.defaultValue = default
    2896          self.mayReturnEmpty = True
    2897
    2898 -    def parseImpl( self, instring, loc, doActions=True ):
    2899          try:
    2900              loc, tokens = self.expr._parse( instring, loc, doActions, callPreParse=False )
    2901          except (ParseException,IndexError):
    2902              if self.defaultValue is not _optionalNotMatched:
    2903                  if self.expr.resultsName:
    2904                      tokens = ParseResults([ self.defaultValue ])
    2905                      tokens[self.expr.resultsName] = self.defaultValue
    2906                  else:
    2907                      tokens = [ self.defaultValue ]
    2908              else:
    2909                  tokens = []
    2910          return loc, tokens
    2911
    2912 -    def __str__( self ):
    2913          if hasattr(self,"name"):
    2914              return self.name
    2915
    2916          if self.strRepr is None:
    2917              self.strRepr = "[" + _ustr(self.expr) + "]"
    2918
    2919          return self.strRepr
    2920
    2921 -class SkipTo(ParseElementEnhance):
    2922      """Token for skipping over all undefined text until the matched expression is found.
    2923
    2924         Parameters:
    2925          - expr - target expression marking the end of the data to be skipped
    2926          - include - (default=False) if True, the target expression is also parsed
    2927            (the skipped text and target expression are returned as a 2-element list).
    2928          - ignore - (default=None) used to define grammars (typically quoted strings and
    2929            comments) that might contain false matches to the target expression
    2930          - failOn - (default=None) define expressions that are not allowed to be
    2931            included in the skipped test; if found before the target expression is found,
    2932            the SkipTo is not a match
    2933      """
    2934 -    def __init__( self, other, include=False, ignore=None, failOn=None ):
    2935          super( SkipTo, self ).__init__( other )
    2936          self.ignoreExpr = ignore
    2937          self.mayReturnEmpty = True
    2938          self.mayIndexError = False
    2939          self.includeMatch = include
    2940          self.asList = False
    2941          if failOn is not None and isinstance(failOn, basestring):
    2942              self.failOn = Literal(failOn)
    2943          else:
    2944              self.failOn = failOn
    2945          self.errmsg = "No match found for "+_ustr(self.expr)
    2946
    2947 -    def parseImpl( self, instring, loc, doActions=True ):
    2948          startloc = loc
    2949          instrlen = len(instring)
    2950          expr = self.expr
    2951          expr_parse = self.expr._parse
    2952          self_failOn_canParseNext = self.failOn.canParseNext if self.failOn is not None else None
    2953          self_ignoreExpr_tryParse = self.ignoreExpr.tryParse if self.ignoreExpr is not None else None
    2954
    2955          tmploc = loc
    2956          while tmploc <= instrlen:
    2957              if self_failOn_canParseNext is not None:
    2958                  # break if failOn expression matches
    2959                  if self_failOn.canParseNext(instring, tmploc):
    2960                      break
    2961
    2962              if self_ignoreExpr_tryParse is not None:
    2963                  # advance past ignore expressions
    2964                  while 1:
    2965                      try:
    2966                          tmploc = self_ignoreExpr_tryParse(instring, tmploc)
    2967                      except ParseBaseException:
    2968                          break
    2969
    2970              try:
    2971                  expr_parse(instring, tmploc, doActions=False, callPreParse=False)
    2972              except (ParseException, IndexError):
    2973                  # no match, advance loc in string
    2974                  tmploc += 1
    2975              else:
    2976                  # matched skipto expr, done
    2977                  break
    2978
    2979          else:
    2980              # ran off the end of the input string without matching skipto expr, fail
    2981              raise ParseException(instring, loc, self.errmsg, self)
    2982
    2983          # build up return values
    2984          loc = tmploc
    2985          skiptext = instring[startloc:loc]
    2986          skipresult = ParseResults(skiptext)
    2987
    2988          if self.includeMatch:
    2989              loc, mat = expr_parse(instring,loc,doActions,callPreParse=False)
    2990              skipresult += mat
    2991
    2992          return loc, skipresult
    2993
    2994 -class Forward(ParseElementEnhance):
    2995      """Forward declaration of an expression to be defined later -
    2996         used for recursive grammars, such as algebraic infix notation.
    2997         When the expression is known, it is assigned to the C{Forward} variable using the '<<' operator.
    2998
    2999         Note: take care when assigning to C{Forward} not to overlook precedence of operators.
    3000         Specifically, '|' has a lower precedence than '<<', so that::
    3001            fwdExpr << a | b | c
    3002         will actually be evaluated as::
    3003            (fwdExpr << a) | b | c
    3004         thereby leaving b and c out as parseable alternatives.  It is recommended that you
    3005         explicitly group the values inserted into the C{Forward}::
    3006            fwdExpr << (a | b | c)
    3007         Converting to use the '<<=' operator instead will avoid this problem.
    3008      """
    3009 -    def __init__( self, other=None ):
    3010          super(Forward,self).__init__( other, savelist=False )
    3011
    3012 -    def __lshift__( self, other ):
    3013          if isinstance( other, basestring ):
    3014              other = ParserElement.literalStringClass(other)
    3015          self.expr = other
    3016          self.strRepr = None
    3017          self.mayIndexError = self.expr.mayIndexError
    3018          self.mayReturnEmpty = self.expr.mayReturnEmpty
    3019          self.setWhitespaceChars( self.expr.whiteChars )
    3020          self.skipWhitespace = self.expr.skipWhitespace
    3021          self.saveAsList = self.expr.saveAsList
    3022          self.ignoreExprs.extend(self.expr.ignoreExprs)
    3023          return self
    3024
    3025 -    def __ilshift__(self, other):
    3026          return self << other
    3027
    3028 -    def leaveWhitespace( self ):
    3029          self.skipWhitespace = False
    3030          return self
    3031
    3032 -    def streamline( self ):
    3033          if not self.streamlined:
    3034              self.streamlined = True
    3035              if self.expr is not None:
    3036                  self.expr.streamline()
    3037          return self
    3038
    3039 -    def validate( self, validateTrace=[] ):
    3040          if self not in validateTrace:
    3041              tmp = validateTrace[:]+[self]
    3042              if self.expr is not None:
    3043                  self.expr.validate(tmp)
    3044          self.checkRecursion([])
    3045
    3046 -    def __str__( self ):
    3047          if hasattr(self,"name"):
    3048              return self.name
    3049          return self.__class__.__name__ + ": ..."
    3050
    3051          # stubbed out for now - creates awful memory and perf issues
    3052          self._revertClass = self.__class__
    3053          self.__class__ = _ForwardNoRecurse
    3054          try:
    3055              if self.expr is not None:
    3056                  retString = _ustr(self.expr)
    3057              else:
    3058                  retString = "None"
    3059          finally:
    3060              self.__class__ = self._revertClass
    3061          return self.__class__.__name__ + ": " + retString
    3062
    3063 -    def copy(self):
    3064          if self.expr is not None:
    3065              return super(Forward,self).copy()
    3066          else:
    3067              ret = Forward()
    3068              ret <<= self
    3069              return ret
    3070
    3071 -class _ForwardNoRecurse(Forward):
    3072 -    def __str__( self ):
    3073          return "..."
    3074
    3075 -class TokenConverter(ParseElementEnhance):
    3076      """Abstract subclass of C{ParseExpression}, for converting parsed results."""
    3077 -    def __init__( self, expr, savelist=False ):
    3078          super(TokenConverter,self).__init__( expr )#, savelist )
    3079          self.saveAsList = False
    3080
    3081 -class Combine(TokenConverter):
    3082      """Converter to concatenate all matching tokens to a single string.
    3083         By default, the matching patterns must also be contiguous in the input string;
    3084         this can be disabled by specifying C{'adjacent=False'} in the constructor.
    3085      """
    3086 -    def __init__( self, expr, joinString="", adjacent=True ):
    3087          super(Combine,self).__init__( expr )
    3088          # suppress whitespace-stripping in contained parse expressions, but re-enable it on the Combine itself
    3089          if adjacent:
    3090              self.leaveWhitespace()
    3091          self.adjacent = adjacent
    3092          self.skipWhitespace = True
    3093          self.joinString = joinString
    3094          self.callPreparse = True
    3095
    3096 -    def ignore( self, other ):
    3097          if self.adjacent:
    3098              ParserElement.ignore(self, other)
    3099          else:
    3100              super( Combine, self).ignore( other )
    3101          return self
    3102
    3103 -    def postParse( self, instring, loc, tokenlist ):
    3104          retToks = tokenlist.copy()
    3105          del retToks[:]
    3106          retToks += ParseResults([ "".join(tokenlist._asStringList(self.joinString)) ], modal=self.modalResults)
    3107
    3108          if self.resultsName and retToks.haskeys():
    3109              return [ retToks ]
    3110          else:
    3111              return retToks
    3112
    3113 -class Group(TokenConverter):
    3114      """Converter to return the matched tokens as a list - useful for returning tokens of C{L{ZeroOrMore}} and C{L{OneOrMore}} expressions."""
    3115 -    def __init__( self, expr ):
    3116          super(Group,self).__init__( expr )
    3117          self.saveAsList = True
    3118
    3119 -    def postParse( self, instring, loc, tokenlist ):
    3120          return [ tokenlist ]
    3121
    3122 -class Dict(TokenConverter):
    3123      """Converter to return a repetitive expression as a list, but also as a dictionary.
    3124         Each element can also be referenced using the first token in the expression as its key.
    3125         Useful for tabular report scraping when the first column can be used as a item key.
    3126      """
    3127 -    def __init__( self, expr ):
    3128          super(Dict,self).__init__( expr )
    3129          self.saveAsList = True
    3130
    3131 -    def postParse( self, instring, loc, tokenlist ):
    3132          for i,tok in enumerate(tokenlist):
    3133              if len(tok) == 0:
    3134                  continue
    3135              ikey = tok[0]
    3136              if isinstance(ikey,int):
    3137                  ikey = _ustr(tok[0]).strip()
    3138              if len(tok)==1:
    3139                  tokenlist[ikey] = _ParseResultsWithOffset("",i)
    3140              elif len(tok)==2 and not isinstance(tok[1],ParseResults):
    3141                  tokenlist[ikey] = _ParseResultsWithOffset(tok[1],i)
    3142              else:
    3143                  dictvalue = tok.copy() #ParseResults(i)
    3144                  del dictvalue[0]
    3145                  if len(dictvalue)!= 1 or (isinstance(dictvalue,ParseResults) and dictvalue.haskeys()):
    3146                      tokenlist[ikey] = _ParseResultsWithOffset(dictvalue,i)
    3147                  else:
    3148                      tokenlist[ikey] = _ParseResultsWithOffset(dictvalue[0],i)
    3149
    3150          if self.resultsName:
    3151              return [ tokenlist ]
    3152          else:
    3153              return tokenlist
    3154
    3155
    3156 -class Suppress(TokenConverter):
    3157      """Converter for ignoring the results of a parsed expression."""
    3158 -    def postParse( self, instring, loc, tokenlist ):
    3159          return []
    3160
    3161 -    def suppress( self ):
    3162          return self
    3163
    3164
    3165 -class OnlyOnce(object):
    3166      """Wrapper for parse actions, to ensure they are only called once."""
    3167 -    def __init__(self, methodCall):
    3168          self.callable = _trim_arity(methodCall)
    3169          self.called = False
    3170 -    def __call__(self,s,l,t):
    3171          if not self.called:
    3172              results = self.callable(s,l,t)
    3173              self.called = True
    3174              return results
    3175          raise ParseException(s,l,"")
    3176 -    def reset(self):
    3177          self.called = False
    3178
    3179 -def traceParseAction(f):
    3180      """Decorator for debugging parse actions."""
    3181      f = _trim_arity(f)
    3182      def z(*paArgs):
    3183          thisFunc = f.func_name
    3184          s,l,t = paArgs[-3:]
    3185          if len(paArgs)>3:
    3186              thisFunc = paArgs[0].__class__.__name__ + '.' + thisFunc
    3187          sys.stderr.write( ">>entering %s(line: '%s', %d, %s)\n" % (thisFunc,line(l,s),l,t) )
    3188          try:
    3189              ret = f(*paArgs)
    3190          except Exception as exc:
    3191              sys.stderr.write( "<<leaving %s (exception: %s)\n" % (thisFunc,exc) )
    3192              raise
    3193          sys.stderr.write( "<<leaving %s (ret: %s)\n" % (thisFunc,ret) )
    3194          return ret
    3195      try:
    3196          z.__name__ = f.__name__
    3197      except AttributeError:
    3198          pass
    3199      return z
    3200
    3201  #
    3202  # global helpers
    3203  #
    3204 -def delimitedList( expr, delim=",", combine=False ):
    3205      """Helper to define a delimited list of expressions - the delimiter defaults to ','.
    3206         By default, the list elements and delimiters can have intervening whitespace, and
    3207         comments, but this can be overridden by passing C{combine=True} in the constructor.
    3208         If C{combine} is set to C{True}, the matching tokens are returned as a single token
    3209         string, with the delimiters included; otherwise, the matching tokens are returned
    3210         as a list of tokens, with the delimiters suppressed.
    3211      """
    3212      dlName = _ustr(expr)+" ["+_ustr(delim)+" "+_ustr(expr)+"]..."
    3213      if combine:
    3214          return Combine( expr + ZeroOrMore( delim + expr ) ).setName(dlName)
    3215      else:
    3216          return ( expr + ZeroOrMore( Suppress( delim ) + expr ) ).setName(dlName)
    3217
    3218 -def countedArray( expr, intExpr=None ):
    3219      """Helper to define a counted list of expressions.
    3220         This helper defines a pattern of the form::
    3221             integer expr expr expr...
    3222         where the leading integer tells how many expr expressions follow.
    3223         The matched tokens returns the array of expr tokens as a list - the leading count token is suppressed.
    3224      """
    3225      arrayExpr = Forward()
    3226      def countFieldParseAction(s,l,t):
    3227          n = t[0]
    3228          arrayExpr << (n and Group(And([expr]*n)) or Group(empty))
    3229          return []
    3230      if intExpr is None:
    3231          intExpr = Word(nums).setParseAction(lambda t:int(t[0]))
    3232      else:
    3233          intExpr = intExpr.copy()
    3234      intExpr.setName("arrayLen")
    3235      intExpr.addParseAction(countFieldParseAction, callDuringTry=True)
    3236      return ( intExpr + arrayExpr ).setName('(len) ' + _ustr(expr) + '...')
    3237
    3238 -def _flatten(L):
    3239      ret = []
    3240      for i in L:
    3241          if isinstance(i,list):
    3242              ret.extend(_flatten(i))
    3243          else:
    3244              ret.append(i)
    3245      return ret
    3246
    3247 -def matchPreviousLiteral(expr):
    3248      """Helper to define an expression that is indirectly defined from
    3249         the tokens matched in a previous expression, that is, it looks
    3250         for a 'repeat' of a previous expression.  For example::
    3251             first = Word(nums)
    3252             second = matchPreviousLiteral(first)
    3253             matchExpr = first + ":" + second
    3254         will match C{"1:1"}, but not C{"1:2"}.  Because this matches a
    3255         previous literal, will also match the leading C{"1:1"} in C{"1:10"}.
    3256         If this is not desired, use C{matchPreviousExpr}.
    3257         Do *not* use with packrat parsing enabled.
    3258      """
    3259      rep = Forward()
    3260      def copyTokenToRepeater(s,l,t):
    3261          if t:
    3262              if len(t) == 1:
    3263                  rep << t[0]
    3264              else:
    3265                  # flatten t tokens
    3266                  tflat = _flatten(t.asList())
    3267                  rep << And(Literal(tt) for tt in tflat)
    3268          else:
    3269              rep << Empty()
    3270      expr.addParseAction(copyTokenToRepeater, callDuringTry=True)
    3271      rep.setName('(prev) ' + _ustr(expr))
    3272      return rep
    3273
    3274 -def matchPreviousExpr(expr):
    3275      """Helper to define an expression that is indirectly defined from
    3276         the tokens matched in a previous expression, that is, it looks
    3277         for a 'repeat' of a previous expression.  For example::
    3278             first = Word(nums)
    3279             second = matchPreviousExpr(first)
    3280             matchExpr = first + ":" + second
    3281         will match C{"1:1"}, but not C{"1:2"}.  Because this matches by
    3282         expressions, will *not* match the leading C{"1:1"} in C{"1:10"};
    3283         the expressions are evaluated first, and then compared, so
    3284         C{"1"} is compared with C{"10"}.
    3285         Do *not* use with packrat parsing enabled.
    3286      """
    3287      rep = Forward()
    3288      e2 = expr.copy()
    3289      rep <<= e2
    3290      def copyTokenToRepeater(s,l,t):
    3291          matchTokens = _flatten(t.asList())
    3292          def mustMatchTheseTokens(s,l,t):
    3293              theseTokens = _flatten(t.asList())
    3294              if  theseTokens != matchTokens:
    3295                  raise ParseException("",0,"")
    3296          rep.setParseAction( mustMatchTheseTokens, callDuringTry=True )
    3297      expr.addParseAction(copyTokenToRepeater, callDuringTry=True)
    3298      rep.setName('(prev) ' + _ustr(expr))
    3299      return rep
    3300
    3301 -def _escapeRegexRangeChars(s):
    3302      #~  escape these chars: ^-]
    3303      for c in r"\^-]":
    3304          s = s.replace(c,_bslash+c)
    3305      s = s.replace("\n",r"\n")
    3306      s = s.replace("\t",r"\t")
    3307      return _ustr(s)
    3308
    3309 -def oneOf( strs, caseless=False, useRegex=True ):
    3310      """Helper to quickly define a set of alternative Literals, and makes sure to do
    3311         longest-first testing when there is a conflict, regardless of the input order,
    3312         but returns a C{L{MatchFirst}} for best performance.
    3313
    3314         Parameters:
    3315          - strs - a string of space-delimited literals, or a list of string literals
    3316          - caseless - (default=False) - treat all literals as caseless
    3317          - useRegex - (default=True) - as an optimization, will generate a Regex
    3318            object; otherwise, will generate a C{MatchFirst} object (if C{caseless=True}, or
    3319            if creating a C{Regex} raises an exception)
    3320      """
    3321      if caseless:
    3322          isequal = ( lambda a,b: a.upper() == b.upper() )
    3323          masks = ( lambda a,b: b.upper().startswith(a.upper()) )
    3324          parseElementClass = CaselessLiteral
    3325      else:
    3326          isequal = ( lambda a,b: a == b )
    3327          masks = ( lambda a,b: b.startswith(a) )
    3328          parseElementClass = Literal
    3329
    3330      symbols = []
    3331      if isinstance(strs,basestring):
    3332          symbols = strs.split()
    3333      elif isinstance(strs, collections.Sequence):
    3334          symbols = list(strs[:])
    3335      elif isinstance(strs, _generatorType):
    3336          symbols = list(strs)
    3337      else:
    3338          warnings.warn("Invalid argument to oneOf, expected string or list",
    3339                  SyntaxWarning, stacklevel=2)
    3340      if not symbols:
    3341          return NoMatch()
    3342
    3343      i = 0
    3344      while i < len(symbols)-1:
    3345          cur = symbols[i]
    3346          for j,other in enumerate(symbols[i+1:]):
    3347              if ( isequal(other, cur) ):
    3348                  del symbols[i+j+1]
    3349                  break
    3350              elif ( masks(cur, other) ):
    3351                  del symbols[i+j+1]
    3352                  symbols.insert(i,other)
    3353                  cur = other
    3354                  break
    3355          else:
    3356              i += 1
    3357
    3358      if not caseless and useRegex:
    3359          #~ print (strs,"->", "|".join( [ _escapeRegexChars(sym) for sym in symbols] ))
    3360          try:
    3361              if len(symbols)==len("".join(symbols)):
    3362                  return Regex( "[%s]" % "".join(_escapeRegexRangeChars(sym) for sym in symbols) ).setName(' | '.join(symbols))
    3363              else:
    3364                  return Regex( "|".join(re.escape(sym) for sym in symbols) ).setName(' | '.join(symbols))
    3365          except:
    3366              warnings.warn("Exception creating Regex for oneOf, building MatchFirst",
    3367                      SyntaxWarning, stacklevel=2)
    3368
    3369
    3370      # last resort, just use MatchFirst
    3371      return MatchFirst(parseElementClass(sym) for sym in symbols).setName(' | '.join(symbols))
    3372
    3373 -def dictOf( key, value ):
    3374      """Helper to easily and clearly define a dictionary by specifying the respective patterns
    3375         for the key and value.  Takes care of defining the C{L{Dict}}, C{L{ZeroOrMore}}, and C{L{Group}} tokens
    3376         in the proper order.  The key pattern can include delimiting markers or punctuation,
    3377         as long as they are suppressed, thereby leaving the significant key text.  The value
    3378         pattern can include named results, so that the C{Dict} results can include named token
    3379         fields.
    3380      """
    3381      return Dict( ZeroOrMore( Group ( key + value ) ) )
    3382
    3383 -def originalTextFor(expr, asString=True):
    3384      """Helper to return the original, untokenized text for a given expression.  Useful to
    3385         restore the parsed fields of an HTML start tag into the raw tag text itself, or to
    3386         revert separate tokens with intervening whitespace back to the original matching
    3387         input text. By default, returns astring containing the original parsed text.
    3388
    3389         If the optional C{asString} argument is passed as C{False}, then the return value is a
    3390         C{L{ParseResults}} containing any results names that were originally matched, and a
    3391         single token containing the original matched text from the input string.  So if
    3392         the expression passed to C{L{originalTextFor}} contains expressions with defined
    3393         results names, you must set C{asString} to C{False} if you want to preserve those
    3394         results name values."""
    3395      locMarker = Empty().setParseAction(lambda s,loc,t: loc)
    3396      endlocMarker = locMarker.copy()
    3397      endlocMarker.callPreparse = False
    3398      matchExpr = locMarker("_original_start") + expr + endlocMarker("_original_end")
    3399      if asString:
    3400          extractText = lambda s,l,t: s[t._original_start:t._original_end]
    3401      else:
    3402          def extractText(s,l,t):
    3403              del t[:]
    3404              t.insert(0, s[t._original_start:t._original_end])
    3405              del t["_original_start"]
    3406              del t["_original_end"]
    3407      matchExpr.setParseAction(extractText)
    3408      return matchExpr
    3409
    3410 -def ungroup(expr):
    3411      """Helper to undo pyparsing's default grouping of And expressions, even
    3412         if all but one are non-empty."""
    3413      return TokenConverter(expr).setParseAction(lambda t:t[0])
    3414
    3415 -def locatedExpr(expr):
    3416      """Helper to decorate a returned token with its starting and ending locations in the input string.
    3417         This helper adds the following results names:
    3418          - locn_start = location where matched expression begins
    3419          - locn_end = location where matched expression ends
    3420          - value = the actual parsed results
    3421
    3422         Be careful if the input text contains C{<TAB>} characters, you may want to call
    3423         C{L{ParserElement.parseWithTabs}}
    3424      """
    3425      locator = Empty().setParseAction(lambda s,l,t: l)
    3426      return Group(locator("locn_start") + expr("value") + locator.copy().leaveWhitespace()("locn_end"))
    3427
    3428
    3429  # convenience constants for positional expressions
    3430  empty       = Empty().setName("empty")
    3431  lineStart   = LineStart().setName("lineStart")
    3432  lineEnd     = LineEnd().setName("lineEnd")
    3433  stringStart = StringStart().setName("stringStart")
    3434  stringEnd   = StringEnd().setName("stringEnd")
    3435
    3436  _escapedPunc = Word( _bslash, r"\[]-*.$+^?()~ ", exact=2 ).setParseAction(lambda s,l,t:t[0][1])
    3437  _escapedHexChar = Regex(r"\\0?[xX][0-9a-fA-F]+").setParseAction(lambda s,l,t:unichr(int(t[0].lstrip(r'\0x'),16)))
    3438  _escapedOctChar = Regex(r"\\0[0-7]+").setParseAction(lambda s,l,t:unichr(int(t[0][1:],8)))
    3439  _singleChar = _escapedPunc | _escapedHexChar | _escapedOctChar | Word(printables, excludeChars=r'\]', exact=1) | Regex(r"\w", re.UNICODE)
    3440  _charRange = Group(_singleChar + Suppress("-") + _singleChar)
    3441  _reBracketExpr = Literal("[") + Optional("^").setResultsName("negate") + Group( OneOrMore( _charRange | _singleChar ) ).setResultsName("body") + "]"
    3442
    3443 -def srange(s):
    3444      r"""Helper to easily define string ranges for use in Word construction.  Borrows
    3445         syntax from regexp '[]' string range definitions::
    3446            srange("[0-9]")   -> "0123456789"
    3447            srange("[a-z]")   -> "abcdefghijklmnopqrstuvwxyz"
    3448            srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_"
    3449         The input string must be enclosed in []'s, and the returned string is the expanded
    3450         character set joined into a single string.
    3451         The values enclosed in the []'s may be::
    3452            a single character
    3453            an escaped character with a leading backslash (such as \- or \])
    3454            an escaped hex character with a leading '\x' (\x21, which is a '!' character)
    3455              (\0x## is also supported for backwards compatibility)
    3456            an escaped octal character with a leading '\0' (\041, which is a '!' character)
    3457            a range of any of the above, separated by a dash ('a-z', etc.)
    3458            any combination of the above ('aeiouy', 'a-zA-Z0-9_$', etc.)
    3459      """
    3460      _expanded = lambda p: p if not isinstance(p,ParseResults) else ''.join(unichr(c) for c in range(ord(p[0]),ord(p[1])+1))
    3461      try:
    3462          return "".join(_expanded(part) for part in _reBracketExpr.parseString(s).body)
    3463      except:
    3464          return ""
    3465
    3466 -def matchOnlyAtCol(n):
    3467      """Helper method for defining parse actions that require matching at a specific
    3468         column in the input text.
    3469      """
    3470      def verifyCol(strg,locn,toks):
    3471          if col(locn,strg) != n:
    3472              raise ParseException(strg,locn,"matched token not at column %d" % n)
    3473      return verifyCol
    3474
    3475 -def replaceWith(replStr):
    3476      """Helper method for common parse actions that simply return a literal value.  Especially
    3477         useful when used with C{L{transformString<ParserElement.transformString>}()}.
    3478      """
    3479      #def _replFunc(*args):
    3480      #    return [replStr]
    3481      #return _replFunc
    3482      return functools.partial(next, itertools.repeat([replStr]))
    3483
    3484 -def removeQuotes(s,l,t):
    3485      """Helper parse action for removing quotation marks from parsed quoted strings.
    3486         To use, add this parse action to quoted string using::
    3487           quotedString.setParseAction( removeQuotes )
    3488      """
    3489      return t[0][1:-1]
    3490
    3491 -def upcaseTokens(s,l,t):
    3492      """Helper parse action to convert tokens to upper case."""
    3493      return [ tt.upper() for tt in map(_ustr,t) ]
    3494
    3495 -def downcaseTokens(s,l,t):
    3496      """Helper parse action to convert tokens to lower case."""
    3497      return [ tt.lower() for tt in map(_ustr,t) ]
    3498
    3499 -def getTokensEndLoc():
    3500      """Method to be called from within a parse action to determine the end
    3501         location of the parsed tokens."""
    3502      import inspect
    3503      fstack = inspect.stack()
    3504      try:
    3505          # search up the stack (through intervening argument normalizers) for correct calling routine
    3506          for f in fstack[2:]:
    3507              if f[3] == "_parseNoCache":
    3508                  endloc = f[0].f_locals["loc"]
    3509                  return endloc
    3510          else:
    3511              raise ParseFatalException("incorrect usage of getTokensEndLoc - may only be called from within a parse action")
    3512      finally:
    3513          del fstack
    3514
    3515 -def _makeTags(tagStr, xml):
    3516      """Internal helper to construct opening and closing tag expressions, given a tag name"""
    3517      if isinstance(tagStr,basestring):
    3518          resname = tagStr
    3519          tagStr = Keyword(tagStr, caseless=not xml)
    3520      else:
    3521          resname = tagStr.name
    3522
    3523      tagAttrName = Word(alphas,alphanums+"_-:")
    3524      if (xml):
    3525          tagAttrValue = dblQuotedString.copy().setParseAction( removeQuotes )
    3526          openTag = Suppress("<") + tagStr("tag") + \
    3527                  Dict(ZeroOrMore(Group( tagAttrName + Suppress("=") + tagAttrValue ))) + \
    3528                  Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">")
    3529      else:
    3530          printablesLessRAbrack = "".join(c for c in printables if c not in ">")
    3531          tagAttrValue = quotedString.copy().setParseAction( removeQuotes ) | Word(printablesLessRAbrack)
    3532          openTag = Suppress("<") + tagStr("tag") + \
    3533                  Dict(ZeroOrMore(Group( tagAttrName.setParseAction(downcaseTokens) + \
    3534                  Optional( Suppress("=") + tagAttrValue ) ))) + \
    3535                  Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">")
    3536      closeTag = Combine(_L("</") + tagStr + ">")
    3537
    3538      openTag = openTag.setResultsName("start"+"".join(resname.replace(":"," ").title().split())).setName("<%s>" % resname)
    3539      closeTag = closeTag.setResultsName("end"+"".join(resname.replace(":"," ").title().split())).setName("</%s>" % resname)
    3540      openTag.tag = resname
    3541      closeTag.tag = resname
    3542      return openTag, closeTag
    3543
    3544 -def makeHTMLTags(tagStr):
    3545      """Helper to construct opening and closing tag expressions for HTML, given a tag name"""
    3546      return _makeTags( tagStr, False )
    3547
    3548 -def makeXMLTags(tagStr):
    3549      """Helper to construct opening and closing tag expressions for XML, given a tag name"""
    3550      return _makeTags( tagStr, True )
    3551
    3552 -def withAttribute(*args,**attrDict):
    3553      """Helper to create a validating parse action to be used with start tags created
    3554         with C{L{makeXMLTags}} or C{L{makeHTMLTags}}. Use C{withAttribute} to qualify a starting tag
    3555         with a required attribute value, to avoid false matches on common tags such as
    3556         C{<TD>} or C{<DIV>}.
    3557
    3558         Call C{withAttribute} with a series of attribute names and values. Specify the list
    3559         of filter attributes names and values as:
    3560          - keyword arguments, as in C{(align="right")}, or
    3561          - as an explicit dict with C{**} operator, when an attribute name is also a Python
    3562            reserved word, as in C{**{"class":"Customer", "align":"right"}}
    3563          - a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") )
    3564         For attribute names with a namespace prefix, you must use the second form.  Attribute
    3565         names are matched insensitive to upper/lower case.
    3566
    3567         If just testing for C{class} (with or without a namespace), use C{L{withClass}}.
    3568
    3569         To verify that the attribute exists, but without specifying a value, pass
    3570         C{withAttribute.ANY_VALUE} as the value.
    3571         """
    3572      if args:
    3573          attrs = args[:]
    3574      else:
    3575          attrs = attrDict.items()
    3576      attrs = [(k,v) for k,v in attrs]
    3577      def pa(s,l,tokens):
    3578          for attrName,attrValue in attrs:
    3579              if attrName not in tokens:
    3580                  raise ParseException(s,l,"no matching attribute " + attrName)
    3581              if attrValue != withAttribute.ANY_VALUE and tokens[attrName] != attrValue:
    3582                  raise ParseException(s,l,"attribute '%s' has value '%s', must be '%s'" %
    3583                                              (attrName, tokens[attrName], attrValue))
    3584      return pa
    3585  withAttribute.ANY_VALUE = object()
    3586
    3587 -def withClass(classname, namespace=''):
    3588      """Simplified version of C{L{withAttribute}} when matching on a div class - made
    3589         difficult because C{class} is a reserved word in Python.
    3590         """
    3591      classattr = "%s:class" % namespace if namespace else "class"
    3592      return withAttribute(**{classattr : classname})
    3593
    3594  opAssoc = _Constants()
    3595  opAssoc.LEFT = object()
    3596  opAssoc.RIGHT = object()
    3597
    3598 -def infixNotation( baseExpr, opList, lpar=Suppress('('), rpar=Suppress(')') ):
    3599      """Helper method for constructing grammars of expressions made up of
    3600         operators working in a precedence hierarchy.  Operators may be unary or
    3601         binary, left- or right-associative.  Parse actions can also be attached
    3602         to operator expressions.
    3603
    3604         Parameters:
    3605          - baseExpr - expression representing the most basic element for the nested
    3606          - opList - list of tuples, one for each operator precedence level in the
    3607            expression grammar; each tuple is of the form
    3608            (opExpr, numTerms, rightLeftAssoc, parseAction), where:
    3609             - opExpr is the pyparsing expression for the operator;
    3610                may also be a string, which will be converted to a Literal;
    3611                if numTerms is 3, opExpr is a tuple of two expressions, for the
    3612                two operators separating the 3 terms
    3613             - numTerms is the number of terms for this operator (must
    3614                be 1, 2, or 3)
    3615             - rightLeftAssoc is the indicator whether the operator is
    3616                right or left associative, using the pyparsing-defined
    3617                constants C{opAssoc.RIGHT} and C{opAssoc.LEFT}.
    3618             - parseAction is the parse action to be associated with
    3619                expressions matching this operator expression (the
    3620                parse action tuple member may be omitted)
    3621          - lpar - expression for matching left-parentheses (default=Suppress('('))
    3622          - rpar - expression for matching right-parentheses (default=Suppress(')'))
    3623      """
    3624      ret = Forward()
    3625      lastExpr = baseExpr | ( lpar + ret + rpar )
    3626      for i,operDef in enumerate(opList):
    3627          opExpr,arity,rightLeftAssoc,pa = (operDef + (None,))[:4]
    3628          termName = "%s term" % opExpr if arity < 3 else "%s%s term" % opExpr
    3629          if arity == 3:
    3630              if opExpr is None or len(opExpr) != 2:
    3631                  raise ValueError("if numterms=3, opExpr must be a tuple or list of two expressions")
    3632              opExpr1, opExpr2 = opExpr
    3633          thisExpr = Forward().setName(termName)
    3634          if rightLeftAssoc == opAssoc.LEFT:
    3635              if arity == 1:
    3636                  matchExpr = FollowedBy(lastExpr + opExpr) + Group( lastExpr + OneOrMore( opExpr ) )
    3637              elif arity == 2:
    3638                  if opExpr is not None:
    3639                      matchExpr = FollowedBy(lastExpr + opExpr + lastExpr) + Group( lastExpr + OneOrMore( opExpr + lastExpr ) )
    3640                  else:
    3641                      matchExpr = FollowedBy(lastExpr+lastExpr) + Group( lastExpr + OneOrMore(lastExpr) )
    3642              elif arity == 3:
    3643                  matchExpr = FollowedBy(lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr) + \
    3644                              Group( lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr )
    3645              else:
    3646                  raise ValueError("operator must be unary (1), binary (2), or ternary (3)")
    3647          elif rightLeftAssoc == opAssoc.RIGHT:
    3648              if arity == 1:
    3649                  # try to avoid LR with this extra test
    3650                  if not isinstance(opExpr, Optional):
    3651                      opExpr = Optional(opExpr)
    3652                  matchExpr = FollowedBy(opExpr.expr + thisExpr) + Group( opExpr + thisExpr )
    3653              elif arity == 2:
    3654                  if opExpr is not None:
    3655                      matchExpr = FollowedBy(lastExpr + opExpr + thisExpr) + Group( lastExpr + OneOrMore( opExpr + thisExpr ) )
    3656                  else:
    3657                      matchExpr = FollowedBy(lastExpr + thisExpr) + Group( lastExpr + OneOrMore( thisExpr ) )
    3658              elif arity == 3:
    3659                  matchExpr = FollowedBy(lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr) + \
    3660                              Group( lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr )
    3661              else:
    3662                  raise ValueError("operator must be unary (1), binary (2), or ternary (3)")
    3663          else:
    3664              raise ValueError("operator must indicate right or left associativity")
    3665          if pa:
    3666              matchExpr.setParseAction( pa )
    3667          thisExpr <<= ( matchExpr.setName(termName) | lastExpr )
    3668          lastExpr = thisExpr
    3669      ret <<= lastExpr
    3670      return ret
    3671  operatorPrecedence = infixNotation
    3672
    3673  dblQuotedString = Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\x[0-9a-fA-F]+)|(?:\\.))*"').setName("string enclosed in double quotes")
    3674  sglQuotedString = Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\x[0-9a-fA-F]+)|(?:\\.))*'").setName("string enclosed in single quotes")
    3675  quotedString = Regex(r'''(?:"(?:[^"\n\r\\]|(?:"")|(?:\\x[0-9a-fA-F]+)|(?:\\.))*")|(?:'(?:[^'\n\r\\]|(?:'')|(?:\\x[0-9a-fA-F]+)|(?:\\.))*')''').setName("quotedString using single or double quotes")
    3676  unicodeString = Combine(_L('u') + quotedString.copy()).setName("unicode string literal")
    3677
    3678 -def nestedExpr(opener="(", closer=")", content=None, ignoreExpr=quotedString.copy()):
    3679      """Helper method for defining nested lists enclosed in opening and closing
    3680         delimiters ("(" and ")" are the default).
    3681
    3682         Parameters:
    3683          - opener - opening character for a nested list (default="("); can also be a pyparsing expression
    3684          - closer - closing character for a nested list (default=")"); can also be a pyparsing expression
    3685          - content - expression for items within the nested lists (default=None)
    3686          - ignoreExpr - expression for ignoring opening and closing delimiters (default=quotedString)
    3687
    3688         If an expression is not provided for the content argument, the nested
    3689         expression will capture all whitespace-delimited content between delimiters
    3690         as a list of separate values.
    3691
    3692         Use the C{ignoreExpr} argument to define expressions that may contain
    3693         opening or closing characters that should not be treated as opening
    3694         or closing characters for nesting, such as quotedString or a comment
    3695         expression.  Specify multiple expressions using an C{L{Or}} or C{L{MatchFirst}}.
    3696         The default is L{quotedString}, but if no expressions are to be ignored,
    3697         then pass C{None} for this argument.
    3698      """
    3699      if opener == closer:
    3700          raise ValueError("opening and closing strings cannot be the same")
    3701      if content is None:
    3702          if isinstance(opener,basestring) and isinstance(closer,basestring):
    3703              if len(opener) == 1 and len(closer)==1:
    3704                  if ignoreExpr is not None:
    3705                      content = (Combine(OneOrMore(~ignoreExpr +
    3706                                      CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS,exact=1))
    3707                                  ).setParseAction(lambda t:t[0].strip()))
    3708                  else:
    3709                      content = (empty.copy()+CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS
    3710                                  ).setParseAction(lambda t:t[0].strip()))
    3711              else:
    3712                  if ignoreExpr is not None:
    3713                      content = (Combine(OneOrMore(~ignoreExpr +
    3714                                      ~Literal(opener) + ~Literal(closer) +
    3715                                      CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1))
    3716                                  ).setParseAction(lambda t:t[0].strip()))
    3717                  else:
    3718                      content = (Combine(OneOrMore(~Literal(opener) + ~Literal(closer) +
    3719                                      CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1))
    3720                                  ).setParseAction(lambda t:t[0].strip()))
    3721          else:
    3722              raise ValueError("opening and closing arguments must be strings if no content expression is given")
    3723      ret = Forward()
    3724      if ignoreExpr is not None:
    3725          ret <<= Group( Suppress(opener) + ZeroOrMore( ignoreExpr | ret | content ) + Suppress(closer) )
    3726      else:
    3727          ret <<= Group( Suppress(opener) + ZeroOrMore( ret | content )  + Suppress(closer) )
    3728      ret.setName('nested %s%s expression' % (opener,closer))
    3729      return ret
    3730
    3731 -def indentedBlock(blockStatementExpr, indentStack, indent=True):
    3732      """Helper method for defining space-delimited indentation blocks, such as
    3733         those used to define block statements in Python source code.
    3734
    3735         Parameters:
    3736          - blockStatementExpr - expression defining syntax of statement that
    3737              is repeated within the indented block
    3738          - indentStack - list created by caller to manage indentation stack
    3739              (multiple statementWithIndentedBlock expressions within a single grammar
    3740              should share a common indentStack)
    3741          - indent - boolean indicating whether block must be indented beyond the
    3742              the current level; set to False for block of left-most statements
    3743              (default=True)
    3744
    3745         A valid block must contain at least one C{blockStatement}.
    3746      """
    3747      def checkPeerIndent(s,l,t):
    3748          if l >= len(s): return
    3749          curCol = col(l,s)
    3750          if curCol != indentStack[-1]:
    3751              if curCol > indentStack[-1]:
    3752                  raise ParseFatalException(s,l,"illegal nesting")
    3753              raise ParseException(s,l,"not a peer entry")
    3754
    3755      def checkSubIndent(s,l,t):
    3756          curCol = col(l,s)
    3757          if curCol > indentStack[-1]:
    3758              indentStack.append( curCol )
    3759          else:
    3760              raise ParseException(s,l,"not a subentry")
    3761
    3762      def checkUnindent(s,l,t):
    3763          if l >= len(s): return
    3764          curCol = col(l,s)
    3765          if not(indentStack and curCol < indentStack[-1] and curCol <= indentStack[-2]):
    3766              raise ParseException(s,l,"not an unindent")
    3767          indentStack.pop()
    3768
    3769      NL = OneOrMore(LineEnd().setWhitespaceChars("\t ").suppress())
    3770      INDENT = (Empty() + Empty().setParseAction(checkSubIndent)).setName('INDENT')
    3771      PEER   = Empty().setParseAction(checkPeerIndent).setName('')
    3772      UNDENT = Empty().setParseAction(checkUnindent).setName('UNINDENT')
    3773      if indent:
    3774          smExpr = Group( Optional(NL) +
    3775              #~ FollowedBy(blockStatementExpr) +
    3776              INDENT + (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) + UNDENT)
    3777      else:
    3778          smExpr = Group( Optional(NL) +
    3779              (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) )
    3780      blockStatementExpr.ignore(_bslash + LineEnd())
    3781      return smExpr.setName('indented block')
    3782
    3783  alphas8bit = srange(r"[\0xc0-\0xd6\0xd8-\0xf6\0xf8-\0xff]")
    3784  punc8bit = srange(r"[\0xa1-\0xbf\0xd7\0xf7]")
    3785
    3786  anyOpenTag,anyCloseTag = makeHTMLTags(Word(alphas,alphanums+"_:").setName('any tag'))
    3787  _htmlEntityMap = dict(zip("gt lt amp nbsp quot apos".split(),'><& "\''))
    3788  commonHTMLEntity = Regex('&(?P<entity>' + '|'.join(_htmlEntityMap.keys()) +");").setName("common HTML entity")
    3789 -def replaceHTMLEntity(t):
    3790      """Helper parser action to replace common HTML entities with their special characters"""
    3791      return _htmlEntityMap.get(t.entity)
    3792
    3793  # it's easy to get these comment structures wrong - they're very common, so may as well make them available
    3794  cStyleComment = Regex(r"/\*(?:[^*]*\*+)+?/").setName("C style comment")
    3795
    3796  htmlComment = Regex(r"<!--[\s\S]*?-->").setName("HTML comment")
    3797  restOfLine = Regex(r".*").leaveWhitespace().setName("rest of line")
    3798  dblSlashComment = Regex(r"\/\/(\\\n|.)*").setName("// comment")
    3799  cppStyleComment = Regex(r"/(?:\*(?:[^*]*\*+)+?/|/[^\n]*(?:\n[^\n]*)*?(?:(?<!\\)|\Z))").setName("C++ style comment")
    3800
    3801  javaStyleComment = cppStyleComment
    3802  pythonStyleComment = Regex(r"#.*").setName("Python style comment")
    3803  _commasepitem = Combine(OneOrMore(Word(printables, excludeChars=',') +
    3804                                    Optional( Word(" \t") +
    3805                                              ~Literal(",") + ~LineEnd() ) ) ).streamline().setName("commaItem")
    3806  commaSeparatedList = delimitedList( Optional( quotedString.copy() | _commasepitem, default="") ).setName("commaSeparatedList")
    3807
    3808
    3809  if __name__ == "__main__":
    3810
    3811      selectToken    = CaselessLiteral( "select" )
    3812      fromToken      = CaselessLiteral( "from" )
    3813
    3814      ident          = Word( alphas, alphanums + "_$" )
    3815      columnName     = delimitedList( ident, ".", combine=True ).setParseAction( upcaseTokens )
    3816      columnNameList = Group( delimitedList( columnName ) ).setName("columns")
    3817      tableName      = delimitedList( ident, ".", combine=True ).setParseAction( upcaseTokens )
    3818      tableNameList  = Group( delimitedList( tableName ) ).setName("tables")
    3819      simpleSQL      = ( selectToken + \
    3820                       ( '*' | columnNameList ).setResultsName( "columns" ) + \
    3821                       fromToken + \
    3822                       tableNameList.setResultsName( "tables" ) )
    3823
    3824      simpleSQL.runTests("""\
    3825            SELECT * from XYZZY, ABC
    3826            select * from SYS.XYZZY
    3827            Select A from Sys.dual
    3828            Select AA,BB,CC from Sys.dual
    3829            Select A, B, C from Sys.dual
    3830            Select A, B, C from Sys.dual
    3831            Xelect A, B, C from Sys.dual
    3832            Select A, B, C frox Sys.dual
    3833            Select
    3834            Select ^^^ frox Sys.dual
    3835            Select A, B, C from Sys.dual, Table2""")
    3836