dottes: abc2xml/pyparsing.py comparison

comparison abc2xml/pyparsing.py @ 484:4fab69a1027d build-default-207

Add MusicXML conversion to tune pages. Might help someone.

author	Jim Hague <jim.hague@acm.org>
date	Tue, 17 Jun 2014 09:11:38 +0100
parents
children	b1dbb76f4eb9

comparison

equal deleted inserted replaced

-:681274f40615
+:4fab69a1027d
+# module pyparsing.py
+#
+# Copyright (c) 2003-2011  Paul T. McGuire
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+#from __future__ import generators
+__doc__ = \
+"""
+pyparsing module - Classes and methods to define and execute parsing grammars
+The pyparsing module is an alternative approach to creating and executing simple grammars,
+vs. the traditional lex/yacc approach, or the use of regular expressions.  With pyparsing, you
+don't need to learn a new syntax for defining grammars or matching expressions - the parsing module
+provides a library of classes that you use to construct the grammar directly in Python.
+Here is a program to parse "Hello, World!" (or any greeting of the form C{"<salutation>, <addressee>!"})::
+from pyparsing import Word, alphas
+# define grammar of a greeting
+greet = Word( alphas ) + "," + Word( alphas ) + "!"
+hello = "Hello, World!"
+print hello, "->", greet.parseString( hello )
+The program outputs the following::
+Hello, World! -> ['Hello', ',', 'World', '!']
+The Python representation of the grammar is quite readable, owing to the self-explanatory
+class names, and the use of '+', '|' and '^' operators.
+The parsed results returned from C{parseString()} can be accessed as a nested list, a dictionary, or an
+object with named attributes.
+The pyparsing module handles some of the problems that are typically vexing when writing text parsers:
+- extra or missing whitespace (the above program will also handle "Hello,World!", "Hello  ,  World  !", etc.)
+- quoted strings
+- embedded comments
+"""
+__version__ = "1.5.6"
+__versionTime__ = "26 June 2011 10:53"
+__author__ = "Paul McGuire <ptmcg@users.sourceforge.net>"
+import string
+from weakref import ref as wkref
+import copy
+import sys
+import warnings
+import re
+import sre_constants
+#~ sys.stderr.write( "testing pyparsing module, version %s, %s\n" % (__version__,__versionTime__ ) )
+__all__ = [
+'And', 'CaselessKeyword', 'CaselessLiteral', 'CharsNotIn', 'Combine', 'Dict', 'Each', 'Empty',
+'FollowedBy', 'Forward', 'GoToColumn', 'Group', 'Keyword', 'LineEnd', 'LineStart', 'Literal',
+'MatchFirst', 'NoMatch', 'NotAny', 'OneOrMore', 'OnlyOnce', 'Optional', 'Or',
+'ParseBaseException', 'ParseElementEnhance', 'ParseException', 'ParseExpression', 'ParseFatalException',
+'ParseResults', 'ParseSyntaxException', 'ParserElement', 'QuotedString', 'RecursiveGrammarException',
+'Regex', 'SkipTo', 'StringEnd', 'StringStart', 'Suppress', 'Token', 'TokenConverter', 'Upcase',
+'White', 'Word', 'WordEnd', 'WordStart', 'ZeroOrMore',
+'alphanums', 'alphas', 'alphas8bit', 'anyCloseTag', 'anyOpenTag', 'cStyleComment', 'col',
+'commaSeparatedList', 'commonHTMLEntity', 'countedArray', 'cppStyleComment', 'dblQuotedString',
+'dblSlashComment', 'delimitedList', 'dictOf', 'downcaseTokens', 'empty', 'getTokensEndLoc', 'hexnums',
+'htmlComment', 'javaStyleComment', 'keepOriginalText', 'line', 'lineEnd', 'lineStart', 'lineno',
+'makeHTMLTags', 'makeXMLTags', 'matchOnlyAtCol', 'matchPreviousExpr', 'matchPreviousLiteral',
+'nestedExpr', 'nullDebugAction', 'nums', 'oneOf', 'opAssoc', 'operatorPrecedence', 'printables',
+'punc8bit', 'pythonStyleComment', 'quotedString', 'removeQuotes', 'replaceHTMLEntity',
+'replaceWith', 'restOfLine', 'sglQuotedString', 'srange', 'stringEnd',
+'stringStart', 'traceParseAction', 'unicodeString', 'upcaseTokens', 'withAttribute',
+'indentedBlock', 'originalTextFor',
+]
+"""
+Detect if we are running version 3.X and make appropriate changes
+Robert A. Clark
+"""
+_PY3K = sys.version_info[0] > 2
+if _PY3K:
+_MAX_INT = sys.maxsize
+basestring = str
+unichr = chr
+_ustr = str
+alphas = string.ascii_lowercase + string.ascii_uppercase
+else:
+_MAX_INT = sys.maxint
+range = xrange
+set = lambda s : dict( [(c,0) for c in s] )
+alphas = string.lowercase + string.uppercase
+def _ustr(obj):
+"""Drop-in replacement for str(obj) that tries to be Unicode friendly. It first tries
+str(obj). If that fails with a UnicodeEncodeError, then it tries unicode(obj). It
+then < returns the unicode object | encodes it with the default encoding | ... >.
+"""
+if isinstance(obj,unicode):
+return obj
+try:
+# If this works, then _ustr(obj) has the same behaviour as str(obj), so
+# it won't break any existing code.
+return str(obj)
+except UnicodeEncodeError:
+# The Python docs (http://docs.python.org/ref/customization.html#l2h-182)
+# state that "The return value must be a string object". However, does a
+# unicode object (being a subclass of basestring) count as a "string
+# object"?
+# If so, then return a unicode object:
+return unicode(obj)
+# Else encode it... but how? There are many choices... :)
+# Replace unprintables with escape codes?
+#return unicode(obj).encode(sys.getdefaultencoding(), 'backslashreplace_errors')
+# Replace unprintables with question marks?
+#return unicode(obj).encode(sys.getdefaultencoding(), 'replace')
+# ...
+alphas = string.lowercase + string.uppercase
+# build list of single arg builtins, tolerant of Python version, that can be used as parse actions
+singleArgBuiltins = []
+import __builtin__
+for fname in "sum len enumerate sorted reversed list tuple set any all".split():
+try:
+singleArgBuiltins.append(getattr(__builtin__,fname))
+except AttributeError:
+continue
+def _xml_escape(data):
+"""Escape &, <, >, ", ', etc. in a string of data."""
+# ampersand must be replaced first
+from_symbols = '&><"\''
+to_symbols = ['&'+s+';' for s in "amp gt lt quot apos".split()]
+for from_,to_ in zip(from_symbols, to_symbols):
+data = data.replace(from_, to_)
+return data
+class _Constants(object):
+pass
+nums       = string.digits
+hexnums    = nums + "ABCDEFabcdef"
+alphanums  = alphas + nums
+_bslash    = chr(92)
+printables = "".join( [ c for c in string.printable if c not in string.whitespace ] )
+class ParseBaseException(Exception):
+"""base exception class for all parsing runtime exceptions"""
+# Performance tuning: we construct a *lot* of these, so keep this
+# constructor as small and fast as possible
+def __init__( self, pstr, loc=0, msg=None, elem=None ):
+self.loc = loc
+if msg is None:
+self.msg = pstr
+self.pstr = ""
+else:
+self.msg = msg
+self.pstr = pstr
+self.parserElement = elem
+def __getattr__( self, aname ):
+"""supported attributes by name are:
+- lineno - returns the line number of the exception text
+- col - returns the column number of the exception text
+- line - returns the line containing the exception text
+"""
+if( aname == "lineno" ):
+return lineno( self.loc, self.pstr )
+elif( aname in ("col", "column") ):
+return col( self.loc, self.pstr )
+elif( aname == "line" ):
+return line( self.loc, self.pstr )
+else:
+raise AttributeError(aname)
+def __str__( self ):
+return "%s (at char %d), (line:%d, col:%d)" % \
+( self.msg, self.loc, self.lineno, self.column )
+def __repr__( self ):
+return _ustr(self)
+def markInputline( self, markerString = ">!<" ):
+"""Extracts the exception line from the input string, and marks
+the location of the exception with a special symbol.
+"""
+line_str = self.line
+line_column = self.column - 1
+if markerString:
+line_str = "".join( [line_str[:line_column],
+markerString, line_str[line_column:]])
+return line_str.strip()
+def __dir__(self):
+return "loc msg pstr parserElement lineno col line " \
+"markInputLine __str__ __repr__".split()
+class ParseException(ParseBaseException):
+"""exception thrown when parse expressions don't match class;
+supported attributes by name are:
+- lineno - returns the line number of the exception text
+- col - returns the column number of the exception text
+- line - returns the line containing the exception text
+"""
+pass
+class ParseFatalException(ParseBaseException):
+"""user-throwable exception thrown when inconsistent parse content
+is found; stops all parsing immediately"""
+pass
+class ParseSyntaxException(ParseFatalException):
+"""just like C{ParseFatalException}, but thrown internally when an
+C{ErrorStop} ('-' operator) indicates that parsing is to stop immediately because
+an unbacktrackable syntax error has been found"""
+def __init__(self, pe):
+super(ParseSyntaxException, self).__init__(
+pe.pstr, pe.loc, pe.msg, pe.parserElement)
+#~ class ReparseException(ParseBaseException):
+#~ """Experimental class - parse actions can raise this exception to cause
+#~ pyparsing to reparse the input string:
+#~ - with a modified input string, and/or
+#~ - with a modified start location
+#~ Set the values of the ReparseException in the constructor, and raise the
+#~ exception in a parse action to cause pyparsing to use the new string/location.
+#~ Setting the values as None causes no change to be made.
+#~ """
+#~ def __init_( self, newstring, restartLoc ):
+#~ self.newParseText = newstring
+#~ self.reparseLoc = restartLoc
+class RecursiveGrammarException(Exception):
+"""exception thrown by C{validate()} if the grammar could be improperly recursive"""
+def __init__( self, parseElementList ):
+self.parseElementTrace = parseElementList
+def __str__( self ):
+return "RecursiveGrammarException: %s" % self.parseElementTrace
+class _ParseResultsWithOffset(object):
+def __init__(self,p1,p2):
+self.tup = (p1,p2)
+def __getitem__(self,i):
+return self.tup[i]
+def __repr__(self):
+return repr(self.tup)
+def setOffset(self,i):
+self.tup = (self.tup[0],i)
+class ParseResults(object):
+"""Structured parse results, to provide multiple means of access to the parsed data:
+- as a list (C{len(results)})
+- by list index (C{results[0], results[1]}, etc.)
+- by attribute (C{results.<resultsName>})
+"""
+#~ __slots__ = ( "__toklist", "__tokdict", "__doinit", "__name", "__parent", "__accumNames", "__weakref__" )
+def __new__(cls, toklist, name=None, asList=True, modal=True ):
+if isinstance(toklist, cls):
+return toklist
+retobj = object.__new__(cls)
+retobj.__doinit = True
+return retobj
+# Performance tuning: we construct a *lot* of these, so keep this
+# constructor as small and fast as possible
+def __init__( self, toklist, name=None, asList=True, modal=True, isinstance=isinstance ):
+if self.__doinit:
+self.__doinit = False
+self.__name = None
+self.__parent = None
+self.__accumNames = {}
+if isinstance(toklist, list):
+self.__toklist = toklist[:]
+else:
+self.__toklist = [toklist]
+self.__tokdict = dict()
+if name is not None and name:
+if not modal:
+self.__accumNames[name] = 0
+if isinstance(name,int):
+name = _ustr(name) # will always return a str, but use _ustr for consistency
+self.__name = name
+if not toklist in (None,'',[]):
+if isinstance(toklist,basestring):
+toklist = [ toklist ]
+if asList:
+if isinstance(toklist,ParseResults):
+self[name] = _ParseResultsWithOffset(toklist.copy(),0)
+else:
+self[name] = _ParseResultsWithOffset(ParseResults(toklist[0]),0)
+self[name].__name = name
+else:
+try:
+self[name] = toklist[0]
+except (KeyError,TypeError,IndexError):
+self[name] = toklist
+def __getitem__( self, i ):
+if isinstance( i, (int,slice) ):
+return self.__toklist[i]
+else:
+if i not in self.__accumNames:
+return self.__tokdict[i][-1][0]
+else:
+return ParseResults([ v[0] for v in self.__tokdict[i] ])
+def __setitem__( self, k, v, isinstance=isinstance ):
+if isinstance(v,_ParseResultsWithOffset):
+self.__tokdict[k] = self.__tokdict.get(k,list()) + [v]
+sub = v[0]
+elif isinstance(k,int):
+self.__toklist[k] = v
+sub = v
+else:
+self.__tokdict[k] = self.__tokdict.get(k,list()) + [_ParseResultsWithOffset(v,0)]
+sub = v
+if isinstance(sub,ParseResults):
+sub.__parent = wkref(self)
+def __delitem__( self, i ):
+if isinstance(i,(int,slice)):
+mylen = len( self.__toklist )
+del self.__toklist[i]
+# convert int to slice
+if isinstance(i, int):
+if i < 0:
+i += mylen
+i = slice(i, i+1)
+# get removed indices
+removed = list(range(*i.indices(mylen)))
+removed.reverse()
+# fixup indices in token dictionary
+for name in self.__tokdict:
+occurrences = self.__tokdict[name]
+for j in removed:
+for k, (value, position) in enumerate(occurrences):
+occurrences[k] = _ParseResultsWithOffset(value, position - (position > j))
+else:
+del self.__tokdict[i]
+def __contains__( self, k ):
+return k in self.__tokdict
+def __len__( self ): return len( self.__toklist )
+def __bool__(self): return len( self.__toklist ) > 0
+__nonzero__ = __bool__
+def __iter__( self ): return iter( self.__toklist )
+def __reversed__( self ): return iter( self.__toklist[::-1] )
+def keys( self ):
+"""Returns all named result keys."""
+return self.__tokdict.keys()
+def pop( self, index=-1 ):
+"""Removes and returns item at specified index (default=last).
+Will work with either numeric indices or dict-key indicies."""
+ret = self[index]
+del self[index]
+return ret
+def get(self, key, defaultValue=None):
+"""Returns named result matching the given key, or if there is no
+such name, then returns the given C{defaultValue} or C{None} if no
+C{defaultValue} is specified."""
+if key in self:
+return self[key]
+else:
+return defaultValue
+def insert( self, index, insStr ):
+"""Inserts new element at location index in the list of parsed tokens."""
+self.__toklist.insert(index, insStr)
+# fixup indices in token dictionary
+for name in self.__tokdict:
+occurrences = self.__tokdict[name]
+for k, (value, position) in enumerate(occurrences):
+occurrences[k] = _ParseResultsWithOffset(value, position + (position > index))
+def items( self ):
+"""Returns all named result keys and values as a list of tuples."""
+return [(k,self[k]) for k in self.__tokdict]
+def values( self ):
+"""Returns all named result values."""
+return [ v[-1][0] for v in self.__tokdict.values() ]
+def __getattr__( self, name ):
+if True: #name not in self.__slots__:
+if name in self.__tokdict:
+if name not in self.__accumNames:
+return self.__tokdict[name][-1][0]
+else:
+return ParseResults([ v[0] for v in self.__tokdict[name] ])
+else:
+return ""
+return None
+def __add__( self, other ):
+ret = self.copy()
+ret += other
+return ret
+def __iadd__( self, other ):
+if other.__tokdict:
+offset = len(self.__toklist)
+addoffset = ( lambda a: (a<0 and offset) or (a+offset) )
+otheritems = other.__tokdict.items()
+otherdictitems = [(k, _ParseResultsWithOffset(v[0],addoffset(v[1])) )
+for (k,vlist) in otheritems for v in vlist]
+for k,v in otherdictitems:
+self[k] = v
+if isinstance(v[0],ParseResults):
+v[0].__parent = wkref(self)
+self.__toklist += other.__toklist
+self.__accumNames.update( other.__accumNames )
+return self
+def __radd__(self, other):
+if isinstance(other,int) and other == 0:
+return self.copy()
+def __repr__( self ):
+return "(%s, %s)" % ( repr( self.__toklist ), repr( self.__tokdict ) )
+def __str__( self ):
+out = "["
+sep = ""
+for i in self.__toklist:
+if isinstance(i, ParseResults):
+out += sep + _ustr(i)
+else:
+out += sep + repr(i)
+sep = ", "
+out += "]"
+return out
+def _asStringList( self, sep='' ):
+out = []
+for item in self.__toklist:
+if out and sep:
+out.append(sep)
+if isinstance( item, ParseResults ):
+out += item._asStringList()
+else:
+out.append( _ustr(item) )
+return out
+def asList( self ):
+"""Returns the parse results as a nested list of matching tokens, all converted to strings."""
+out = []
+for res in self.__toklist:
+if isinstance(res,ParseResults):
+out.append( res.asList() )
+else:
+out.append( res )
+return out
+def asDict( self ):
+"""Returns the named parse results as dictionary."""
+return dict( self.items() )
+def copy( self ):
+"""Returns a new copy of a C{ParseResults} object."""
+ret = ParseResults( self.__toklist )
+ret.__tokdict = self.__tokdict.copy()
+ret.__parent = self.__parent
+ret.__accumNames.update( self.__accumNames )
+ret.__name = self.__name
+return ret
+def asXML( self, doctag=None, namedItemsOnly=False, indent="", formatted=True ):
+"""Returns the parse results as XML. Tags are created for tokens and lists that have defined results names."""
+nl = "\n"
+out = []
+namedItems = dict( [ (v[1],k) for (k,vlist) in self.__tokdict.items()
+for v in vlist ] )
+nextLevelIndent = indent + "  "
+# collapse out indents if formatting is not desired
+if not formatted:
+indent = ""
+nextLevelIndent = ""
+nl = ""
+selfTag = None
+if doctag is not None:
+selfTag = doctag
+else:
+if self.__name:
+selfTag = self.__name
+if not selfTag:
+if namedItemsOnly:
+return ""
+else:
+selfTag = "ITEM"
+out += [ nl, indent, "<", selfTag, ">" ]
+worklist = self.__toklist
+for i,res in enumerate(worklist):
+if isinstance(res,ParseResults):
+if i in namedItems:
+out += [ res.asXML(namedItems[i],
+namedItemsOnly and doctag is None,
+nextLevelIndent,
+formatted)]
+else:
+out += [ res.asXML(None,
+namedItemsOnly and doctag is None,
+nextLevelIndent,
+formatted)]
+else:
+# individual token, see if there is a name for it
+resTag = None
+if i in namedItems:
+resTag = namedItems[i]
+if not resTag:
+if namedItemsOnly:
+continue
+else:
+resTag = "ITEM"
+xmlBodyText = _xml_escape(_ustr(res))
+out += [ nl, nextLevelIndent, "<", resTag, ">",
+xmlBodyText,
+"</", resTag, ">" ]
+out += [ nl, indent, "</", selfTag, ">" ]
+return "".join(out)
+def __lookup(self,sub):
+for k,vlist in self.__tokdict.items():
+for v,loc in vlist:
+if sub is v:
+return k
+return None
+def getName(self):
+"""Returns the results name for this token expression."""
+if self.__name:
+return self.__name
+elif self.__parent:
+par = self.__parent()
+if par:
+return par.__lookup(self)
+else:
+return None
+elif (len(self) == 1 and
+len(self.__tokdict) == 1 and
+self.__tokdict.values()[0][0][1] in (0,-1)):
+return self.__tokdict.keys()[0]
+else:
+return None
+def dump(self,indent='',depth=0):
+"""Diagnostic method for listing out the contents of a C{ParseResults}.
+Accepts an optional C{indent} argument so that this string can be embedded
+in a nested display of other data."""
+out = []
+out.append( indent+_ustr(self.asList()) )
+keys = self.items()
+keys.sort()
+for k,v in keys:
+if out:
+out.append('\n')
+out.append( "%s%s- %s: " % (indent,('  '*depth), k) )
+if isinstance(v,ParseResults):
+if v.keys():
+out.append( v.dump(indent,depth+1) )
+else:
+out.append(_ustr(v))
+else:
+out.append(_ustr(v))
+return "".join(out)
+# add support for pickle protocol
+def __getstate__(self):
+return ( self.__toklist,
+( self.__tokdict.copy(),
+self.__parent is not None and self.__parent() or None,
+self.__accumNames,
+self.__name ) )
+def __setstate__(self,state):
+self.__toklist = state[0]
+(self.__tokdict,
+par,
+inAccumNames,
+self.__name) = state[1]
+self.__accumNames = {}
+self.__accumNames.update(inAccumNames)
+if par is not None:
+self.__parent = wkref(par)
+else:
+self.__parent = None
+def __dir__(self):
+return dir(super(ParseResults,self)) + self.keys()
+def col (loc,strg):
+"""Returns current column within a string, counting newlines as line separators.
+The first column is number 1.
+Note: the default parsing behavior is to expand tabs in the input string
+before starting the parsing process.  See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information
+on parsing strings containing <TAB>s, and suggested methods to maintain a
+consistent view of the parsed string, the parse location, and line and column
+positions within the parsed string.
+"""
+return (loc<len(strg) and strg[loc] == '\n') and 1 or loc - strg.rfind("\n", 0, loc)
+def lineno(loc,strg):
+"""Returns current line number within a string, counting newlines as line separators.
+The first line is number 1.
+Note: the default parsing behavior is to expand tabs in the input string
+before starting the parsing process.  See L{I{ParserElement.parseString}<ParserElement.parseString>} for more information
+on parsing strings containing <TAB>s, and suggested methods to maintain a
+consistent view of the parsed string, the parse location, and line and column
+positions within the parsed string.
+"""
+return strg.count("\n",0,loc) + 1
+def line( loc, strg ):
+"""Returns the line of text containing loc within a string, counting newlines as line separators.
+"""
+lastCR = strg.rfind("\n", 0, loc)
+nextCR = strg.find("\n", loc)
+if nextCR >= 0:
+return strg[lastCR+1:nextCR]
+else:
+return strg[lastCR+1:]
+def _defaultStartDebugAction( instring, loc, expr ):
+print ("Match " + _ustr(expr) + " at loc " + _ustr(loc) + "(%d,%d)" % ( lineno(loc,instring), col(loc,instring) ))
+def _defaultSuccessDebugAction( instring, startloc, endloc, expr, toks ):
+print ("Matched " + _ustr(expr) + " -> " + str(toks.asList()))
+def _defaultExceptionDebugAction( instring, loc, expr, exc ):
+print ("Exception raised:" + _ustr(exc))
+def nullDebugAction(*args):
+"""'Do-nothing' debug action, to suppress debugging output during parsing."""
+pass
+'decorator to trim function calls to match the arity of the target'
+if not _PY3K:
+def _trim_arity(func, maxargs=2):
+limit = [0]
+def wrapper(*args):
+while 1:
+try:
+return func(*args[limit[0]:])
+except TypeError:
+if limit[0] <= maxargs:
+limit[0] += 1
+continue
+raise
+return wrapper
+else:
+def _trim_arity(func, maxargs=2):
+limit = maxargs
+def wrapper(*args):
+#~ nonlocal limit
+while 1:
+try:
+return func(*args[limit:])
+except TypeError:
+if limit:
+limit -= 1
+continue
+raise
+return wrapper
+class ParserElement(object):
+"""Abstract base level parser element class."""
+DEFAULT_WHITE_CHARS = " \n\t\r"
+verbose_stacktrace = False
+def setDefaultWhitespaceChars( chars ):
+"""Overrides the default whitespace chars
+"""
+ParserElement.DEFAULT_WHITE_CHARS = chars
+setDefaultWhitespaceChars = staticmethod(setDefaultWhitespaceChars)
+def __init__( self, savelist=False ):
+self.parseAction = list()
+self.failAction = None
+#~ self.name = "<unknown>"  # don't define self.name, let subclasses try/except upcall
+self.strRepr = None
+self.resultsName = None
+self.saveAsList = savelist
+self.skipWhitespace = True
+self.whiteChars = ParserElement.DEFAULT_WHITE_CHARS
+self.copyDefaultWhiteChars = True
+self.mayReturnEmpty = False # used when checking for left-recursion
+self.keepTabs = False
+self.ignoreExprs = list()
+self.debug = False
+self.streamlined = False
+self.mayIndexError = True # used to optimize exception handling for subclasses that don't advance parse index
+self.errmsg = ""
+self.modalResults = True # used to mark results names as modal (report only last) or cumulative (list all)
+self.debugActions = ( None, None, None ) #custom debug actions
+self.re = None
+self.callPreparse = True # used to avoid redundant calls to preParse
+self.callDuringTry = False
+def copy( self ):
+"""Make a copy of this C{ParserElement}.  Useful for defining different parse actions
+for the same parsing pattern, using copies of the original parse element."""
+cpy = copy.copy( self )
+cpy.parseAction = self.parseAction[:]
+cpy.ignoreExprs = self.ignoreExprs[:]
+if self.copyDefaultWhiteChars:
+cpy.whiteChars = ParserElement.DEFAULT_WHITE_CHARS
+return cpy
+def setName( self, name ):
+"""Define name for this expression, for use in debugging."""
+self.name = name
+self.errmsg = "Expected " + self.name
+if hasattr(self,"exception"):
+self.exception.msg = self.errmsg
+return self
+def setResultsName( self, name, listAllMatches=False ):
+"""Define name for referencing matching tokens as a nested attribute
+of the returned parse results.
+NOTE: this returns a *copy* of the original C{ParserElement} object;
+this is so that the client can define a basic element, such as an
+integer, and reference it in multiple places with different names.
+You can also set results names using the abbreviated syntax,
+C{expr("name")} in place of C{expr.setResultsName("name")} -
+see L{I{__call__}<__call__>}.
+"""
+newself = self.copy()
+if name.endswith("*"):
+name = name[:-1]
+listAllMatches=True
+newself.resultsName = name
+newself.modalResults = not listAllMatches
+return newself
+def setBreak(self,breakFlag = True):
+"""Method to invoke the Python pdb debugger when this element is
+about to be parsed. Set C{breakFlag} to True to enable, False to
+disable.
+"""
+if breakFlag:
+_parseMethod = self._parse
+def breaker(instring, loc, doActions=True, callPreParse=True):
+import pdb
+pdb.set_trace()
+return _parseMethod( instring, loc, doActions, callPreParse )
+breaker._originalParseMethod = _parseMethod
+self._parse = breaker
+else:
+if hasattr(self._parse,"_originalParseMethod"):
+self._parse = self._parse._originalParseMethod
+return self
+def setParseAction( self, *fns, **kwargs ):
+"""Define action to perform when successfully matching parse element definition.
+Parse action fn is a callable method with 0-3 arguments, called as C{fn(s,loc,toks)},
+C{fn(loc,toks)}, C{fn(toks)}, or just C{fn()}, where:
+- s   = the original string being parsed (see note below)
+- loc = the location of the matching substring
+- toks = a list of the matched tokens, packaged as a ParseResults object
+If the functions in fns modify the tokens, they can return them as the return
+value from fn, and the modified list of tokens will replace the original.
+Otherwise, fn does not need to return any value.
+Note: the default parsing behavior is to expand tabs in the input string
+before starting the parsing process.  See L{I{parseString}<parseString>} for more information
+on parsing strings containing <TAB>s, and suggested methods to maintain a
+consistent view of the parsed string, the parse location, and line and column
+positions within the parsed string.
+"""
+self.parseAction = list(map(_trim_arity, list(fns)))
+self.callDuringTry = ("callDuringTry" in kwargs and kwargs["callDuringTry"])
+return self
+def addParseAction( self, *fns, **kwargs ):
+"""Add parse action to expression's list of parse actions. See L{I{setParseAction}<setParseAction>}."""
+self.parseAction += list(map(_trim_arity, list(fns)))
+self.callDuringTry = self.callDuringTry or ("callDuringTry" in kwargs and kwargs["callDuringTry"])
+return self
+def setFailAction( self, fn ):
+"""Define action to perform if parsing fails at this expression.
+Fail acton fn is a callable function that takes the arguments
+C{fn(s,loc,expr,err)} where:
+- s = string being parsed
+- loc = location where expression match was attempted and failed
+- expr = the parse expression that failed
+- err = the exception thrown
+The function returns no value.  It may throw C{ParseFatalException}
+if it is desired to stop parsing immediately."""
+self.failAction = fn
+return self
+def _skipIgnorables( self, instring, loc ):
+exprsFound = True
+while exprsFound:
+exprsFound = False
+for e in self.ignoreExprs:
+try:
+while 1:
+loc,dummy = e._parse( instring, loc )
+exprsFound = True
+except ParseException:
+pass
+return loc
+def preParse( self, instring, loc ):
+if self.ignoreExprs:
+loc = self._skipIgnorables( instring, loc )
+if self.skipWhitespace:
+wt = self.whiteChars
+instrlen = len(instring)
+while loc < instrlen and instring[loc] in wt:
+loc += 1
+return loc
+def parseImpl( self, instring, loc, doActions=True ):
+return loc, []
+def postParse( self, instring, loc, tokenlist ):
+return tokenlist
+#~ @profile
+def _parseNoCache( self, instring, loc, doActions=True, callPreParse=True ):
+debugging = ( self.debug ) #and doActions )
+if debugging or self.failAction:
+#~ print ("Match",self,"at loc",loc,"(%d,%d)" % ( lineno(loc,instring), col(loc,instring) ))
+if (self.debugActions[0] ):
+self.debugActions[0]( instring, loc, self )
+if callPreParse and self.callPreparse:
+preloc = self.preParse( instring, loc )
+else:
+preloc = loc
+tokensStart = preloc
+try:
+try:
+loc,tokens = self.parseImpl( instring, preloc, doActions )
+except IndexError:
+raise ParseException( instring, len(instring), self.errmsg, self )
+except ParseBaseException:
+#~ print ("Exception raised:", err)
+err = None
+if self.debugActions[2]:
+err = sys.exc_info()[1]
+self.debugActions[2]( instring, tokensStart, self, err )
+if self.failAction:
+if err is None:
+err = sys.exc_info()[1]
+self.failAction( instring, tokensStart, self, err )
+raise
+else:
+if callPreParse and self.callPreparse:
+preloc = self.preParse( instring, loc )
+else:
+preloc = loc
+tokensStart = preloc
+if self.mayIndexError or loc >= len(instring):
+try:
+loc,tokens = self.parseImpl( instring, preloc, doActions )
+except IndexError:
+raise ParseException( instring, len(instring), self.errmsg, self )
+else:
+loc,tokens = self.parseImpl( instring, preloc, doActions )
+tokens = self.postParse( instring, loc, tokens )
+retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList, modal=self.modalResults )
+if self.parseAction and (doActions or self.callDuringTry):
+if debugging:
+try:
+for fn in self.parseAction:
+tokens = fn( instring, tokensStart, retTokens )
+if tokens is not None:
+retTokens = ParseResults( tokens,
+self.resultsName,
+asList=self.saveAsList and isinstance(tokens,(ParseResults,list)),
+modal=self.modalResults )
+except ParseBaseException:
+#~ print "Exception raised in user parse action:", err
+if (self.debugActions[2] ):
+err = sys.exc_info()[1]
+self.debugActions[2]( instring, tokensStart, self, err )
+raise
+else:
+for fn in self.parseAction:
+tokens = fn( instring, tokensStart, retTokens )
+if tokens is not None:
+retTokens = ParseResults( tokens,
+self.resultsName,
+asList=self.saveAsList and isinstance(tokens,(ParseResults,list)),
+modal=self.modalResults )
+if debugging:
+#~ print ("Matched",self,"->",retTokens.asList())
+if (self.debugActions[1] ):
+self.debugActions[1]( instring, tokensStart, loc, self, retTokens )
+return loc, retTokens
+def tryParse( self, instring, loc ):
+try:
+return self._parse( instring, loc, doActions=False )[0]
+except ParseFatalException:
+raise ParseException( instring, loc, self.errmsg, self)
+# this method gets repeatedly called during backtracking with the same arguments -
+# we can cache these arguments and save ourselves the trouble of re-parsing the contained expression
+def _parseCache( self, instring, loc, doActions=True, callPreParse=True ):
+lookup = (self,instring,loc,callPreParse,doActions)
+if lookup in ParserElement._exprArgCache:
+value = ParserElement._exprArgCache[ lookup ]
+if isinstance(value, Exception):
+raise value
+return (value[0],value[1].copy())
+else:
+try:
+value = self._parseNoCache( instring, loc, doActions, callPreParse )
+ParserElement._exprArgCache[ lookup ] = (value[0],value[1].copy())
+return value
+except ParseBaseException:
+pe = sys.exc_info()[1]
+ParserElement._exprArgCache[ lookup ] = pe
+raise
+_parse = _parseNoCache
+# argument cache for optimizing repeated calls when backtracking through recursive expressions
+_exprArgCache = {}
+def resetCache():
+ParserElement._exprArgCache.clear()
+resetCache = staticmethod(resetCache)
+_packratEnabled = False
+def enablePackrat():
+"""Enables "packrat" parsing, which adds memoizing to the parsing logic.
+Repeated parse attempts at the same string location (which happens
+often in many complex grammars) can immediately return a cached value,
+instead of re-executing parsing/validating code.  Memoizing is done of
+both valid results and parsing exceptions.
+This speedup may break existing programs that use parse actions that
+have side-effects.  For this reason, packrat parsing is disabled when
+you first import pyparsing.  To activate the packrat feature, your
+program must call the class method C{ParserElement.enablePackrat()}.  If
+your program uses C{psyco} to "compile as you go", you must call
+C{enablePackrat} before calling C{psyco.full()}.  If you do not do this,
+Python will crash.  For best results, call C{enablePackrat()} immediately
+after importing pyparsing.
+"""
+if not ParserElement._packratEnabled:
+ParserElement._packratEnabled = True
+ParserElement._parse = ParserElement._parseCache
+enablePackrat = staticmethod(enablePackrat)
+def parseString( self, instring, parseAll=False ):
+"""Execute the parse expression with the given string.
+This is the main interface to the client code, once the complete
+expression has been built.
+If you want the grammar to require that the entire input string be
+successfully parsed, then set C{parseAll} to True (equivalent to ending
+the grammar with C{StringEnd()}).
+Note: C{parseString} implicitly calls C{expandtabs()} on the input string,
+in order to report proper column numbers in parse actions.
+If the input string contains tabs and
+the grammar uses parse actions that use the C{loc} argument to index into the
+string being parsed, you can ensure you have a consistent view of the input
+string by:
+- calling C{parseWithTabs} on your grammar before calling C{parseString}
+(see L{I{parseWithTabs}<parseWithTabs>})
+- define your parse action using the full C{(s,loc,toks)} signature, and
+reference the input string using the parse action's C{s} argument
+- explictly expand the tabs in your input string before calling
+C{parseString}
+"""
+ParserElement.resetCache()
+if not self.streamlined:
+self.streamline()
+#~ self.saveAsList = True
+for e in self.ignoreExprs:
+e.streamline()
+if not self.keepTabs:
+instring = instring.expandtabs()
+try:
+loc, tokens = self._parse( instring, 0 )
+if parseAll:
+loc = self.preParse( instring, loc )
+se = Empty() + StringEnd()
+se._parse( instring, loc )
+except ParseBaseException:
+if ParserElement.verbose_stacktrace:
+raise
+else:
+# catch and re-raise exception from here, clears out pyparsing internal stack trace
+exc = sys.exc_info()[1]
+raise exc
+else:
+return tokens
+def scanString( self, instring, maxMatches=_MAX_INT, overlap=False ):
+"""Scan the input string for expression matches.  Each match will return the
+matching tokens, start location, and end location.  May be called with optional
+C{maxMatches} argument, to clip scanning after 'n' matches are found.  If
+C{overlap} is specified, then overlapping matches will be reported.
+Note that the start and end locations are reported relative to the string
+being parsed.  See L{I{parseString}<parseString>} for more information on parsing
+strings with embedded tabs."""
+if not self.streamlined:
+self.streamline()
+for e in self.ignoreExprs:
+e.streamline()
+if not self.keepTabs:
+instring = _ustr(instring).expandtabs()
+instrlen = len(instring)
+loc = 0
+preparseFn = self.preParse
+parseFn = self._parse
+ParserElement.resetCache()
+matches = 0
+try:
+while loc <= instrlen and matches < maxMatches:
+try:
+preloc = preparseFn( instring, loc )
+nextLoc,tokens = parseFn( instring, preloc, callPreParse=False )
+except ParseException:
+loc = preloc+1
+else:
+if nextLoc > loc:
+matches += 1
+yield tokens, preloc, nextLoc
+if overlap:
+nextloc = preparseFn( instring, loc )
+if nextloc > loc:
+loc = nextLoc
+else:
+loc += 1
+else:
+loc = nextLoc
+else:
+loc = preloc+1
+except ParseBaseException:
+if ParserElement.verbose_stacktrace:
+raise
+else:
+# catch and re-raise exception from here, clears out pyparsing internal stack trace
+exc = sys.exc_info()[1]
+raise exc
+def transformString( self, instring ):
+"""Extension to C{scanString}, to modify matching text with modified tokens that may
+be returned from a parse action.  To use C{transformString}, define a grammar and
+attach a parse action to it that modifies the returned token list.
+Invoking C{transformString()} on a target string will then scan for matches,
+and replace the matched text patterns according to the logic in the parse
+action.  C{transformString()} returns the resulting transformed string."""
+out = []
+lastE = 0
+# force preservation of <TAB>s, to minimize unwanted transformation of string, and to
+# keep string locs straight between transformString and scanString
+self.keepTabs = True
+try:
+for t,s,e in self.scanString( instring ):
+out.append( instring[lastE:s] )
+if t:
+if isinstance(t,ParseResults):
+out += t.asList()
+elif isinstance(t,list):
+out += t
+else:
+out.append(t)
+lastE = e
+out.append(instring[lastE:])
+out = [o for o in out if o]
+return "".join(map(_ustr,_flatten(out)))
+except ParseBaseException:
+if ParserElement.verbose_stacktrace:
+raise
+else:
+# catch and re-raise exception from here, clears out pyparsing internal stack trace
+exc = sys.exc_info()[1]
+raise exc
+def searchString( self, instring, maxMatches=_MAX_INT ):
+"""Another extension to C{scanString}, simplifying the access to the tokens found
+to match the given parse expression.  May be called with optional
+C{maxMatches} argument, to clip searching after 'n' matches are found.
+"""
+try:
+return ParseResults([ t for t,s,e in self.scanString( instring, maxMatches ) ])
+except ParseBaseException:
+if ParserElement.verbose_stacktrace:
+raise
+else:
+# catch and re-raise exception from here, clears out pyparsing internal stack trace
+exc = sys.exc_info()[1]
+raise exc
+def __add__(self, other ):
+"""Implementation of + operator - returns And"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return And( [ self, other ] )
+def __radd__(self, other ):
+"""Implementation of + operator when left operand is not a C{ParserElement}"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return other + self
+def __sub__(self, other):
+"""Implementation of - operator, returns C{And} with error stop"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return And( [ self, And._ErrorStop(), other ] )
+def __rsub__(self, other ):
+"""Implementation of - operator when left operand is not a C{ParserElement}"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return other - self
+def __mul__(self,other):
+"""Implementation of * operator, allows use of C{expr * 3} in place of
+C{expr + expr + expr}.  Expressions may also me multiplied by a 2-integer
+tuple, similar to C{{min,max}} multipliers in regular expressions.  Tuples
+may also include C{None} as in:
+- C{expr*(n,None)} or C{expr*(n,)} is equivalent
+to C{expr*n + ZeroOrMore(expr)}
+(read as "at least n instances of C{expr}")
+- C{expr*(None,n)} is equivalent to C{expr*(0,n)}
+(read as "0 to n instances of C{expr}")
+- C{expr*(None,None)} is equivalent to C{ZeroOrMore(expr)}
+- C{expr*(1,None)} is equivalent to C{OneOrMore(expr)}
+Note that C{expr*(None,n)} does not raise an exception if
+more than n exprs exist in the input stream; that is,
+C{expr*(None,n)} does not enforce a maximum number of expr
+occurrences.  If this behavior is desired, then write
+C{expr*(None,n) + ~expr}
+"""
+if isinstance(other,int):
+minElements, optElements = other,0
+elif isinstance(other,tuple):
+other = (other + (None, None))[:2]
+if other[0] is None:
+other = (0, other[1])
+if isinstance(other[0],int) and other[1] is None:
+if other[0] == 0:
+return ZeroOrMore(self)
+if other[0] == 1:
+return OneOrMore(self)
+else:
+return self*other[0] + ZeroOrMore(self)
+elif isinstance(other[0],int) and isinstance(other[1],int):
+minElements, optElements = other
+optElements -= minElements
+else:
+raise TypeError("cannot multiply 'ParserElement' and ('%s','%s') objects", type(other[0]),type(other[1]))
+else:
+raise TypeError("cannot multiply 'ParserElement' and '%s' objects", type(other))
+if minElements < 0:
+raise ValueError("cannot multiply ParserElement by negative value")
+if optElements < 0:
+raise ValueError("second tuple value must be greater or equal to first tuple value")
+if minElements == optElements == 0:
+raise ValueError("cannot multiply ParserElement by 0 or (0,0)")
+if (optElements):
+def makeOptionalList(n):
+if n>1:
+return Optional(self + makeOptionalList(n-1))
+else:
+return Optional(self)
+if minElements:
+if minElements == 1:
+ret = self + makeOptionalList(optElements)
+else:
+ret = And([self]*minElements) + makeOptionalList(optElements)
+else:
+ret = makeOptionalList(optElements)
+else:
+if minElements == 1:
+ret = self
+else:
+ret = And([self]*minElements)
+return ret
+def __rmul__(self, other):
+return self.__mul__(other)
+def __or__(self, other ):
+"""Implementation of | operator - returns C{MatchFirst}"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return MatchFirst( [ self, other ] )
+def __ror__(self, other ):
+"""Implementation of | operator when left operand is not a C{ParserElement}"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return other | self
+def __xor__(self, other ):
+"""Implementation of ^ operator - returns C{Or}"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return Or( [ self, other ] )
+def __rxor__(self, other ):
+"""Implementation of ^ operator when left operand is not a C{ParserElement}"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return other ^ self
+def __and__(self, other ):
+"""Implementation of & operator - returns C{Each}"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return Each( [ self, other ] )
+def __rand__(self, other ):
+"""Implementation of & operator when left operand is not a C{ParserElement}"""
+if isinstance( other, basestring ):
+other = Literal( other )
+if not isinstance( other, ParserElement ):
+warnings.warn("Cannot combine element of type %s with ParserElement" % type(other),
+SyntaxWarning, stacklevel=2)
+return None
+return other & self
+def __invert__( self ):
+"""Implementation of ~ operator - returns C{NotAny}"""
+return NotAny( self )
+def __call__(self, name):
+"""Shortcut for C{setResultsName}, with C{listAllMatches=default}::
+userdata = Word(alphas).setResultsName("name") + Word(nums+"-").setResultsName("socsecno")
+could be written as::
+userdata = Word(alphas)("name") + Word(nums+"-")("socsecno")
+If C{name} is given with a trailing C{'*'} character, then C{listAllMatches} will be
+passed as C{True}.
+"""
+return self.setResultsName(name)
+def suppress( self ):
+"""Suppresses the output of this C{ParserElement}; useful to keep punctuation from
+cluttering up returned output.
+"""
+return Suppress( self )
+def leaveWhitespace( self ):
+"""Disables the skipping of whitespace before matching the characters in the
+C{ParserElement}'s defined pattern.  This is normally only used internally by
+the pyparsing module, but may be needed in some whitespace-sensitive grammars.
+"""
+self.skipWhitespace = False
+return self
+def setWhitespaceChars( self, chars ):
+"""Overrides the default whitespace chars
+"""
+self.skipWhitespace = True
+self.whiteChars = chars
+self.copyDefaultWhiteChars = False
+return self
+def parseWithTabs( self ):
+"""Overrides default behavior to expand C{<TAB>}s to spaces before parsing the input string.
+Must be called before C{parseString} when the input grammar contains elements that
+match C{<TAB>} characters."""
+self.keepTabs = True
+return self
+def ignore( self, other ):
+"""Define expression to be ignored (e.g., comments) while doing pattern
+matching; may be called repeatedly, to define multiple comment or other
+ignorable patterns.
+"""
+if isinstance( other, Suppress ):
+if other not in self.ignoreExprs:
+self.ignoreExprs.append( other.copy() )
+else:
+self.ignoreExprs.append( Suppress( other.copy() ) )
+return self
+def setDebugActions( self, startAction, successAction, exceptionAction ):
+"""Enable display of debugging messages while doing pattern matching."""
+self.debugActions = (startAction or _defaultStartDebugAction,
+successAction or _defaultSuccessDebugAction,
+exceptionAction or _defaultExceptionDebugAction)
+self.debug = True
+return self
+def setDebug( self, flag=True ):
+"""Enable display of debugging messages while doing pattern matching.
+Set C{flag} to True to enable, False to disable."""
+if flag:
+self.setDebugActions( _defaultStartDebugAction, _defaultSuccessDebugAction, _defaultExceptionDebugAction )
+else:
+self.debug = False
+return self
+def __str__( self ):
+return self.name
+def __repr__( self ):
+return _ustr(self)
+def streamline( self ):
+self.streamlined = True
+self.strRepr = None
+return self
+def checkRecursion( self, parseElementList ):
+pass
+def validate( self, validateTrace=[] ):
+"""Check defined expressions for valid structure, check for infinite recursive definitions."""
+self.checkRecursion( [] )
+def parseFile( self, file_or_filename, parseAll=False ):
+"""Execute the parse expression on the given file or filename.
+If a filename is specified (instead of a file object),
+the entire file is opened, read, and closed before parsing.
+"""
+try:
+file_contents = file_or_filename.read()
+except AttributeError:
+f = open(file_or_filename, "rb")
+file_contents = f.read()
+f.close()
+try:
+return self.parseString(file_contents, parseAll)
+except ParseBaseException:
+# catch and re-raise exception from here, clears out pyparsing internal stack trace
+exc = sys.exc_info()[1]
+raise exc
+def getException(self):
+return ParseException("",0,self.errmsg,self)
+def __getattr__(self,aname):
+if aname == "myException":
+self.myException = ret = self.getException();
+return ret;
+else:
+raise AttributeError("no such attribute " + aname)
+def __eq__(self,other):
+if isinstance(other, ParserElement):
+return self is other or self.__dict__ == other.__dict__
+elif isinstance(other, basestring):
+try:
+self.parseString(_ustr(other), parseAll=True)
+return True
+except ParseBaseException:
+return False
+else:
+return super(ParserElement,self)==other
+def __ne__(self,other):
+return not (self == other)
+def __hash__(self):
+return hash(id(self))
+def __req__(self,other):
+return self == other
+def __rne__(self,other):
+return not (self == other)
+class Token(ParserElement):
+"""Abstract C{ParserElement} subclass, for defining atomic matching patterns."""
+def __init__( self ):
+super(Token,self).__init__( savelist=False )
+def setName(self, name):
+s = super(Token,self).setName(name)
+self.errmsg = "Expected " + self.name
+return s
+class Empty(Token):
+"""An empty token, will always match."""
+def __init__( self ):
+super(Empty,self).__init__()
+self.name = "Empty"
+self.mayReturnEmpty = True
+self.mayIndexError = False
+class NoMatch(Token):
+"""A token that will never match."""
+def __init__( self ):
+super(NoMatch,self).__init__()
+self.name = "NoMatch"
+self.mayReturnEmpty = True
+self.mayIndexError = False
+self.errmsg = "Unmatchable token"
+def parseImpl( self, instring, loc, doActions=True ):
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+class Literal(Token):
+"""Token to exactly match a specified string."""
+def __init__( self, matchString ):
+super(Literal,self).__init__()
+self.match = matchString
+self.matchLen = len(matchString)
+try:
+self.firstMatchChar = matchString[0]
+except IndexError:
+warnings.warn("null string passed to Literal; use Empty() instead",
+SyntaxWarning, stacklevel=2)
+self.__class__ = Empty
+self.name = '"%s"' % _ustr(self.match)
+self.errmsg = "Expected " + self.name
+self.mayReturnEmpty = False
+self.mayIndexError = False
+# Performance tuning: this routine gets called a *lot*
+# if this is a single character match string  and the first character matches,
+# short-circuit as quickly as possible, and avoid calling startswith
+#~ @profile
+def parseImpl( self, instring, loc, doActions=True ):
+if (instring[loc] == self.firstMatchChar and
+(self.matchLen==1 or instring.startswith(self.match,loc)) ):
+return loc+self.matchLen, self.match
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+_L = Literal
+class Keyword(Token):
+"""Token to exactly match a specified string as a keyword, that is, it must be
+immediately followed by a non-keyword character.  Compare with C{Literal}::
+Literal("if") will match the leading C{'if'} in C{'ifAndOnlyIf'}.
+Keyword("if") will not; it will only match the leading C{'if'} in C{'if x=1'}, or C{'if(y==2)'}
+Accepts two optional constructor arguments in addition to the keyword string:
+C{identChars} is a string of characters that would be valid identifier characters,
+defaulting to all alphanumerics + "_" and "$"; C{caseless} allows case-insensitive
+matching, default is C{False}.
+"""
+DEFAULT_KEYWORD_CHARS = alphanums+"_$"
+def __init__( self, matchString, identChars=DEFAULT_KEYWORD_CHARS, caseless=False ):
+super(Keyword,self).__init__()
+self.match = matchString
+self.matchLen = len(matchString)
+try:
+self.firstMatchChar = matchString[0]
+except IndexError:
+warnings.warn("null string passed to Keyword; use Empty() instead",
+SyntaxWarning, stacklevel=2)
+self.name = '"%s"' % self.match
+self.errmsg = "Expected " + self.name
+self.mayReturnEmpty = False
+self.mayIndexError = False
+self.caseless = caseless
+if caseless:
+self.caselessmatch = matchString.upper()
+identChars = identChars.upper()
+self.identChars = set(identChars)
+def parseImpl( self, instring, loc, doActions=True ):
+if self.caseless:
+if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and
+(loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) and
+(loc == 0 or instring[loc-1].upper() not in self.identChars) ):
+return loc+self.matchLen, self.match
+else:
+if (instring[loc] == self.firstMatchChar and
+(self.matchLen==1 or instring.startswith(self.match,loc)) and
+(loc >= len(instring)-self.matchLen or instring[loc+self.matchLen] not in self.identChars) and
+(loc == 0 or instring[loc-1] not in self.identChars) ):
+return loc+self.matchLen, self.match
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+def copy(self):
+c = super(Keyword,self).copy()
+c.identChars = Keyword.DEFAULT_KEYWORD_CHARS
+return c
+def setDefaultKeywordChars( chars ):
+"""Overrides the default Keyword chars
+"""
+Keyword.DEFAULT_KEYWORD_CHARS = chars
+setDefaultKeywordChars = staticmethod(setDefaultKeywordChars)
+class CaselessLiteral(Literal):
+"""Token to match a specified string, ignoring case of letters.
+Note: the matched results will always be in the case of the given
+match string, NOT the case of the input text.
+"""
+def __init__( self, matchString ):
+super(CaselessLiteral,self).__init__( matchString.upper() )
+# Preserve the defining literal.
+self.returnString = matchString
+self.name = "'%s'" % self.returnString
+self.errmsg = "Expected " + self.name
+def parseImpl( self, instring, loc, doActions=True ):
+if instring[ loc:loc+self.matchLen ].upper() == self.match:
+return loc+self.matchLen, self.returnString
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+class CaselessKeyword(Keyword):
+def __init__( self, matchString, identChars=Keyword.DEFAULT_KEYWORD_CHARS ):
+super(CaselessKeyword,self).__init__( matchString, identChars, caseless=True )
+def parseImpl( self, instring, loc, doActions=True ):
+if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and
+(loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) ):
+return loc+self.matchLen, self.match
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+class Word(Token):
+"""Token for matching words composed of allowed character sets.
+Defined with string containing all allowed initial characters,
+an optional string containing allowed body characters (if omitted,
+defaults to the initial character set), and an optional minimum,
+maximum, and/or exact length.  The default value for C{min} is 1 (a
+minimum value < 1 is not valid); the default values for C{max} and C{exact}
+are 0, meaning no maximum or exact length restriction. An optional
+C{exclude} parameter can list characters that might be found in
+the input C{bodyChars} string; useful to define a word of all printables
+except for one or two characters, for instance.
+"""
+def __init__( self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None ):
+super(Word,self).__init__()
+if excludeChars:
+initChars = ''.join([c for c in initChars if c not in excludeChars])
+if bodyChars:
+bodyChars = ''.join([c for c in bodyChars if c not in excludeChars])
+self.initCharsOrig = initChars
+self.initChars = set(initChars)
+if bodyChars :
+self.bodyCharsOrig = bodyChars
+self.bodyChars = set(bodyChars)
+else:
+self.bodyCharsOrig = initChars
+self.bodyChars = set(initChars)
+self.maxSpecified = max > 0
+if min < 1:
+raise ValueError("cannot specify a minimum length < 1; use Optional(Word()) if zero-length word is permitted")
+self.minLen = min
+if max > 0:
+self.maxLen = max
+else:
+self.maxLen = _MAX_INT
+if exact > 0:
+self.maxLen = exact
+self.minLen = exact
+self.name = _ustr(self)
+self.errmsg = "Expected " + self.name
+self.mayIndexError = False
+self.asKeyword = asKeyword
+if ' ' not in self.initCharsOrig+self.bodyCharsOrig and (min==1 and max==0 and exact==0):
+if self.bodyCharsOrig == self.initCharsOrig:
+self.reString = "[%s]+" % _escapeRegexRangeChars(self.initCharsOrig)
+elif len(self.bodyCharsOrig) == 1:
+self.reString = "%s[%s]*" % \
+(re.escape(self.initCharsOrig),
+_escapeRegexRangeChars(self.bodyCharsOrig),)
+else:
+self.reString = "[%s][%s]*" % \
+(_escapeRegexRangeChars(self.initCharsOrig),
+_escapeRegexRangeChars(self.bodyCharsOrig),)
+if self.asKeyword:
+self.reString = r"\b"+self.reString+r"\b"
+try:
+self.re = re.compile( self.reString )
+except:
+self.re = None
+def parseImpl( self, instring, loc, doActions=True ):
+if self.re:
+result = self.re.match(instring,loc)
+if not result:
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+loc = result.end()
+return loc, result.group()
+if not(instring[ loc ] in self.initChars):
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+start = loc
+loc += 1
+instrlen = len(instring)
+bodychars = self.bodyChars
+maxloc = start + self.maxLen
+maxloc = min( maxloc, instrlen )
+while loc < maxloc and instring[loc] in bodychars:
+loc += 1
+throwException = False
+if loc - start < self.minLen:
+throwException = True
+if self.maxSpecified and loc < instrlen and instring[loc] in bodychars:
+throwException = True
+if self.asKeyword:
+if (start>0 and instring[start-1] in bodychars) or (loc<instrlen and instring[loc] in bodychars):
+throwException = True
+if throwException:
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+return loc, instring[start:loc]
+def __str__( self ):
+try:
+return super(Word,self).__str__()
+except:
+pass
+if self.strRepr is None:
+def charsAsStr(s):
+if len(s)>4:
+return s[:4]+"..."
+else:
+return s
+if ( self.initCharsOrig != self.bodyCharsOrig ):
+self.strRepr = "W:(%s,%s)" % ( charsAsStr(self.initCharsOrig), charsAsStr(self.bodyCharsOrig) )
+else:
+self.strRepr = "W:(%s)" % charsAsStr(self.initCharsOrig)
+return self.strRepr
+class Regex(Token):
+"""Token for matching strings that match a given regular expression.
+Defined with string specifying the regular expression in a form recognized by the inbuilt Python re module.
+"""
+compiledREtype = type(re.compile("[A-Z]"))
+def __init__( self, pattern, flags=0):
+"""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."""
+super(Regex,self).__init__()
+if isinstance(pattern, basestring):
+if len(pattern) == 0:
+warnings.warn("null string passed to Regex; use Empty() instead",
+SyntaxWarning, stacklevel=2)
+self.pattern = pattern
+self.flags = flags
+try:
+self.re = re.compile(self.pattern, self.flags)
+self.reString = self.pattern
+except sre_constants.error:
+warnings.warn("invalid pattern (%s) passed to Regex" % pattern,
+SyntaxWarning, stacklevel=2)
+raise
+elif isinstance(pattern, Regex.compiledREtype):
+self.re = pattern
+self.pattern = \
+self.reString = str(pattern)
+self.flags = flags
+else:
+raise ValueError("Regex may only be constructed with a string or a compiled RE object")
+self.name = _ustr(self)
+self.errmsg = "Expected " + self.name
+self.mayIndexError = False
+self.mayReturnEmpty = True
+def parseImpl( self, instring, loc, doActions=True ):
+result = self.re.match(instring,loc)
+if not result:
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+loc = result.end()
+d = result.groupdict()
+ret = ParseResults(result.group())
+if d:
+for k in d:
+ret[k] = d[k]
+return loc,ret
+def __str__( self ):
+try:
+return super(Regex,self).__str__()
+except:
+pass
+if self.strRepr is None:
+self.strRepr = "Re:(%s)" % repr(self.pattern)
+return self.strRepr
+class QuotedString(Token):
+"""Token for matching strings that are delimited by quoting characters.
+"""
+def __init__( self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None):
+"""
+Defined with the following parameters:
+- quoteChar - string of one or more characters defining the quote delimiting string
+- escChar - character to escape quotes, typically backslash (default=None)
+- escQuote - special quote sequence to escape an embedded quote string (such as SQL's "" to escape an embedded ") (default=None)
+- multiline - boolean indicating whether quotes can span multiple lines (default=False)
+- unquoteResults - boolean indicating whether the matched text should be unquoted (default=True)
+- endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=None => same as quoteChar)
+"""
+super(QuotedString,self).__init__()
+# remove white space from quote chars - wont work anyway
+quoteChar = quoteChar.strip()
+if len(quoteChar) == 0:
+warnings.warn("quoteChar cannot be the empty string",SyntaxWarning,stacklevel=2)
+raise SyntaxError()
+if endQuoteChar is None:
+endQuoteChar = quoteChar
+else:
+endQuoteChar = endQuoteChar.strip()
+if len(endQuoteChar) == 0:
+warnings.warn("endQuoteChar cannot be the empty string",SyntaxWarning,stacklevel=2)
+raise SyntaxError()
+self.quoteChar = quoteChar
+self.quoteCharLen = len(quoteChar)
+self.firstQuoteChar = quoteChar[0]
+self.endQuoteChar = endQuoteChar
+self.endQuoteCharLen = len(endQuoteChar)
+self.escChar = escChar
+self.escQuote = escQuote
+self.unquoteResults = unquoteResults
+if multiline:
+self.flags = re.MULTILINE | re.DOTALL
+self.pattern = r'%s(?:[^%s%s]' % \
+( re.escape(self.quoteChar),
+_escapeRegexRangeChars(self.endQuoteChar[0]),
+(escChar is not None and _escapeRegexRangeChars(escChar) or '') )
+else:
+self.flags = 0
+self.pattern = r'%s(?:[^%s\n\r%s]' % \
+( re.escape(self.quoteChar),
+_escapeRegexRangeChars(self.endQuoteChar[0]),
+(escChar is not None and _escapeRegexRangeChars(escChar) or '') )
+if len(self.endQuoteChar) > 1:
+self.pattern += (
+'|(?:' + ')|(?:'.join(["%s[^%s]" % (re.escape(self.endQuoteChar[:i]),
+_escapeRegexRangeChars(self.endQuoteChar[i]))
+for i in range(len(self.endQuoteChar)-1,0,-1)]) + ')'
+)
+if escQuote:
+self.pattern += (r'|(?:%s)' % re.escape(escQuote))
+if escChar:
+self.pattern += (r'|(?:%s.)' % re.escape(escChar))
+charset = ''.join(set(self.quoteChar[0]+self.endQuoteChar[0])).replace('^',r'\^').replace('-',r'\-')
+self.escCharReplacePattern = re.escape(self.escChar)+("([%s])" % charset)
+self.pattern += (r')*%s' % re.escape(self.endQuoteChar))
+try:
+self.re = re.compile(self.pattern, self.flags)
+self.reString = self.pattern
+except sre_constants.error:
+warnings.warn("invalid pattern (%s) passed to Regex" % self.pattern,
+SyntaxWarning, stacklevel=2)
+raise
+self.name = _ustr(self)
+self.errmsg = "Expected " + self.name
+self.mayIndexError = False
+self.mayReturnEmpty = True
+def parseImpl( self, instring, loc, doActions=True ):
+result = instring[loc] == self.firstQuoteChar and self.re.match(instring,loc) or None
+if not result:
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+loc = result.end()
+ret = result.group()
+if self.unquoteResults:
+# strip off quotes
+ret = ret[self.quoteCharLen:-self.endQuoteCharLen]
+if isinstance(ret,basestring):
+# replace escaped characters
+if self.escChar:
+ret = re.sub(self.escCharReplacePattern,"\g<1>",ret)
+# replace escaped quotes
+if self.escQuote:
+ret = ret.replace(self.escQuote, self.endQuoteChar)
+return loc, ret
+def __str__( self ):
+try:
+return super(QuotedString,self).__str__()
+except:
+pass
+if self.strRepr is None:
+self.strRepr = "quoted string, starting with %s ending with %s" % (self.quoteChar, self.endQuoteChar)
+return self.strRepr
+class CharsNotIn(Token):
+"""Token for matching words composed of characters *not* in a given set.
+Defined with string containing all disallowed characters, and an optional
+minimum, maximum, and/or exact length.  The default value for C{min} is 1 (a
+minimum value < 1 is not valid); the default values for C{max} and C{exact}
+are 0, meaning no maximum or exact length restriction.
+"""
+def __init__( self, notChars, min=1, max=0, exact=0 ):
+super(CharsNotIn,self).__init__()
+self.skipWhitespace = False
+self.notChars = notChars
+if min < 1:
+raise ValueError("cannot specify a minimum length < 1; use Optional(CharsNotIn()) if zero-length char group is permitted")
+self.minLen = min
+if max > 0:
+self.maxLen = max
+else:
+self.maxLen = _MAX_INT
+if exact > 0:
+self.maxLen = exact
+self.minLen = exact
+self.name = _ustr(self)
+self.errmsg = "Expected " + self.name
+self.mayReturnEmpty = ( self.minLen == 0 )
+self.mayIndexError = False
+def parseImpl( self, instring, loc, doActions=True ):
+if instring[loc] in self.notChars:
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+start = loc
+loc += 1
+notchars = self.notChars
+maxlen = min( start+self.maxLen, len(instring) )
+while loc < maxlen and \
+(instring[loc] not in notchars):
+loc += 1
+if loc - start < self.minLen:
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+return loc, instring[start:loc]
+def __str__( self ):
+try:
+return super(CharsNotIn, self).__str__()
+except:
+pass
+if self.strRepr is None:
+if len(self.notChars) > 4:
+self.strRepr = "!W:(%s...)" % self.notChars[:4]
+else:
+self.strRepr = "!W:(%s)" % self.notChars
+return self.strRepr
+class White(Token):
+"""Special matching class for matching whitespace.  Normally, whitespace is ignored
+by pyparsing grammars.  This class is included when some whitespace structures
+are significant.  Define with a string containing the whitespace characters to be
+matched; default is C{" \\t\\r\\n"}.  Also takes optional C{min}, C{max}, and C{exact} arguments,
+as defined for the C{Word} class."""
+whiteStrs = {
+" " : "<SPC>",
+"\t": "<TAB>",
+"\n": "<LF>",
+"\r": "<CR>",
+"\f": "<FF>",
+}
+def __init__(self, ws=" \t\r\n", min=1, max=0, exact=0):
+super(White,self).__init__()
+self.matchWhite = ws
+self.setWhitespaceChars( "".join([c for c in self.whiteChars if c not in self.matchWhite]) )
+#~ self.leaveWhitespace()
+self.name = ("".join([White.whiteStrs[c] for c in self.matchWhite]))
+self.mayReturnEmpty = True
+self.errmsg = "Expected " + self.name
+self.minLen = min
+if max > 0:
+self.maxLen = max
+else:
+self.maxLen = _MAX_INT
+if exact > 0:
+self.maxLen = exact
+self.minLen = exact
+def parseImpl( self, instring, loc, doActions=True ):
+if not(instring[ loc ] in self.matchWhite):
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+start = loc
+loc += 1
+maxloc = start + self.maxLen
+maxloc = min( maxloc, len(instring) )
+while loc < maxloc and instring[loc] in self.matchWhite:
+loc += 1
+if loc - start < self.minLen:
+#~ raise ParseException( instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+return loc, instring[start:loc]
+class _PositionToken(Token):
+def __init__( self ):
+super(_PositionToken,self).__init__()
+self.name=self.__class__.__name__
+self.mayReturnEmpty = True
+self.mayIndexError = False
+class GoToColumn(_PositionToken):
+"""Token to advance to a specific column of input text; useful for tabular report scraping."""
+def __init__( self, colno ):
+super(GoToColumn,self).__init__()
+self.col = colno
+def preParse( self, instring, loc ):
+if col(loc,instring) != self.col:
+instrlen = len(instring)
+if self.ignoreExprs:
+loc = self._skipIgnorables( instring, loc )
+while loc < instrlen and instring[loc].isspace() and col( loc, instring ) != self.col :
+loc += 1
+return loc
+def parseImpl( self, instring, loc, doActions=True ):
+thiscol = col( loc, instring )
+if thiscol > self.col:
+raise ParseException( instring, loc, "Text not in expected column", self )
+newloc = loc + self.col - thiscol
+ret = instring[ loc: newloc ]
+return newloc, ret
+class LineStart(_PositionToken):
+"""Matches if current position is at the beginning of a line within the parse string"""
+def __init__( self ):
+super(LineStart,self).__init__()
+self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") )
+self.errmsg = "Expected start of line"
+def preParse( self, instring, loc ):
+preloc = super(LineStart,self).preParse(instring,loc)
+if instring[preloc] == "\n":
+loc += 1
+return loc
+def parseImpl( self, instring, loc, doActions=True ):
+if not( loc==0 or
+(loc == self.preParse( instring, 0 )) or
+(instring[loc-1] == "\n") ): #col(loc, instring) != 1:
+#~ raise ParseException( instring, loc, "Expected start of line" )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+return loc, []
+class LineEnd(_PositionToken):
+"""Matches if current position is at the end of a line within the parse string"""
+def __init__( self ):
+super(LineEnd,self).__init__()
+self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") )
+self.errmsg = "Expected end of line"
+def parseImpl( self, instring, loc, doActions=True ):
+if loc<len(instring):
+if instring[loc] == "\n":
+return loc+1, "\n"
+else:
+#~ raise ParseException( instring, loc, "Expected end of line" )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+elif loc == len(instring):
+return loc+1, []
+else:
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+class StringStart(_PositionToken):
+"""Matches if current position is at the beginning of the parse string"""
+def __init__( self ):
+super(StringStart,self).__init__()
+self.errmsg = "Expected start of text"
+def parseImpl( self, instring, loc, doActions=True ):
+if loc != 0:
+# see if entire string up to here is just whitespace and ignoreables
+if loc != self.preParse( instring, 0 ):
+#~ raise ParseException( instring, loc, "Expected start of text" )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+return loc, []
+class StringEnd(_PositionToken):
+"""Matches if current position is at the end of the parse string"""
+def __init__( self ):
+super(StringEnd,self).__init__()
+self.errmsg = "Expected end of text"
+def parseImpl( self, instring, loc, doActions=True ):
+if loc < len(instring):
+#~ raise ParseException( instring, loc, "Expected end of text" )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+elif loc == len(instring):
+return loc+1, []
+elif loc > len(instring):
+return loc, []
+else:
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+class WordStart(_PositionToken):
+"""Matches if the current position is at the beginning of a Word, and
+is not preceded by any character in a given set of C{wordChars}
+(default=C{printables}). To emulate the C{\b} behavior of regular expressions,
+use C{WordStart(alphanums)}. C{WordStart} will also match at the beginning of
+the string being parsed, or at the beginning of a line.
+"""
+def __init__(self, wordChars = printables):
+super(WordStart,self).__init__()
+self.wordChars = set(wordChars)
+self.errmsg = "Not at the start of a word"
+def parseImpl(self, instring, loc, doActions=True ):
+if loc != 0:
+if (instring[loc-1] in self.wordChars or
+instring[loc] not in self.wordChars):
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+return loc, []
+class WordEnd(_PositionToken):
+"""Matches if the current position is at the end of a Word, and
+is not followed by any character in a given set of C{wordChars}
+(default=C{printables}). To emulate the C{\b} behavior of regular expressions,
+use C{WordEnd(alphanums)}. C{WordEnd} will also match at the end of
+the string being parsed, or at the end of a line.
+"""
+def __init__(self, wordChars = printables):
+super(WordEnd,self).__init__()
+self.wordChars = set(wordChars)
+self.skipWhitespace = False
+self.errmsg = "Not at the end of a word"
+def parseImpl(self, instring, loc, doActions=True ):
+instrlen = len(instring)
+if instrlen>0 and loc<instrlen:
+if (instring[loc] in self.wordChars or
+instring[loc-1] not in self.wordChars):
+#~ raise ParseException( instring, loc, "Expected end of word" )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+return loc, []
+class ParseExpression(ParserElement):
+"""Abstract subclass of ParserElement, for combining and post-processing parsed tokens."""
+def __init__( self, exprs, savelist = False ):
+super(ParseExpression,self).__init__(savelist)
+if isinstance( exprs, list ):
+self.exprs = exprs
+elif isinstance( exprs, basestring ):
+self.exprs = [ Literal( exprs ) ]
+else:
+try:
+self.exprs = list( exprs )
+except TypeError:
+self.exprs = [ exprs ]
+self.callPreparse = False
+def __getitem__( self, i ):
+return self.exprs[i]
+def append( self, other ):
+self.exprs.append( other )
+self.strRepr = None
+return self
+def leaveWhitespace( self ):
+"""Extends C{leaveWhitespace} defined in base class, and also invokes C{leaveWhitespace} on
+all contained expressions."""
+self.skipWhitespace = False
+self.exprs = [ e.copy() for e in self.exprs ]
+for e in self.exprs:
+e.leaveWhitespace()
+return self
+def ignore( self, other ):
+if isinstance( other, Suppress ):
+if other not in self.ignoreExprs:
+super( ParseExpression, self).ignore( other )
+for e in self.exprs:
+e.ignore( self.ignoreExprs[-1] )
+else:
+super( ParseExpression, self).ignore( other )
+for e in self.exprs:
+e.ignore( self.ignoreExprs[-1] )
+return self
+def __str__( self ):
+try:
+return super(ParseExpression,self).__str__()
+except:
+pass
+if self.strRepr is None:
+self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.exprs) )
+return self.strRepr
+def streamline( self ):
+super(ParseExpression,self).streamline()
+for e in self.exprs:
+e.streamline()
+# collapse nested And's of the form And( And( And( a,b), c), d) to And( a,b,c,d )
+# but only if there are no parse actions or resultsNames on the nested And's
+# (likewise for Or's and MatchFirst's)
+if ( len(self.exprs) == 2 ):
+other = self.exprs[0]
+if ( isinstance( other, self.__class__ ) and
+not(other.parseAction) and
+other.resultsName is None and
+not other.debug ):
+self.exprs = other.exprs[:] + [ self.exprs[1] ]
+self.strRepr = None
+self.mayReturnEmpty |= other.mayReturnEmpty
+self.mayIndexError  |= other.mayIndexError
+other = self.exprs[-1]
+if ( isinstance( other, self.__class__ ) and
+not(other.parseAction) and
+other.resultsName is None and
+not other.debug ):
+self.exprs = self.exprs[:-1] + other.exprs[:]
+self.strRepr = None
+self.mayReturnEmpty |= other.mayReturnEmpty
+self.mayIndexError  |= other.mayIndexError
+return self
+def setResultsName( self, name, listAllMatches=False ):
+ret = super(ParseExpression,self).setResultsName(name,listAllMatches)
+return ret
+def validate( self, validateTrace=[] ):
+tmp = validateTrace[:]+[self]
+for e in self.exprs:
+e.validate(tmp)
+self.checkRecursion( [] )
+def copy(self):
+ret = super(ParseExpression,self).copy()
+ret.exprs = [e.copy() for e in self.exprs]
+return ret
+class And(ParseExpression):
+"""Requires all given C{ParseExpression}s to be found in the given order.
+Expressions may be separated by whitespace.
+May be constructed using the C{'+'} operator.
+"""
+class _ErrorStop(Empty):
+def __init__(self, *args, **kwargs):
+super(Empty,self).__init__(*args, **kwargs)
+self.leaveWhitespace()
+def __init__( self, exprs, savelist = True ):
+super(And,self).__init__(exprs, savelist)
+self.mayReturnEmpty = True
+for e in self.exprs:
+if not e.mayReturnEmpty:
+self.mayReturnEmpty = False
+break
+self.setWhitespaceChars( exprs[0].whiteChars )
+self.skipWhitespace = exprs[0].skipWhitespace
+self.callPreparse = True
+def parseImpl( self, instring, loc, doActions=True ):
+# pass False as last arg to _parse for first element, since we already
+# pre-parsed the string as part of our And pre-parsing
+loc, resultlist = self.exprs[0]._parse( instring, loc, doActions, callPreParse=False )
+errorStop = False
+for e in self.exprs[1:]:
+if isinstance(e, And._ErrorStop):
+errorStop = True
+continue
+if errorStop:
+try:
+loc, exprtokens = e._parse( instring, loc, doActions )
+except ParseSyntaxException:
+raise
+except ParseBaseException:
+pe = sys.exc_info()[1]
+raise ParseSyntaxException(pe)
+except IndexError:
+raise ParseSyntaxException( ParseException(instring, len(instring), self.errmsg, self) )
+else:
+loc, exprtokens = e._parse( instring, loc, doActions )
+if exprtokens or exprtokens.keys():
+resultlist += exprtokens
+return loc, resultlist
+def __iadd__(self, other ):
+if isinstance( other, basestring ):
+other = Literal( other )
+return self.append( other ) #And( [ self, other ] )
+def checkRecursion( self, parseElementList ):
+subRecCheckList = parseElementList[:] + [ self ]
+for e in self.exprs:
+e.checkRecursion( subRecCheckList )
+if not e.mayReturnEmpty:
+break
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+if self.strRepr is None:
+self.strRepr = "{" + " ".join( [ _ustr(e) for e in self.exprs ] ) + "}"
+return self.strRepr
+class Or(ParseExpression):
+"""Requires that at least one C{ParseExpression} is found.
+If two expressions match, the expression that matches the longest string will be used.
+May be constructed using the C{'^'} operator.
+"""
+def __init__( self, exprs, savelist = False ):
+super(Or,self).__init__(exprs, savelist)
+self.mayReturnEmpty = False
+for e in self.exprs:
+if e.mayReturnEmpty:
+self.mayReturnEmpty = True
+break
+def parseImpl( self, instring, loc, doActions=True ):
+maxExcLoc = -1
+maxMatchLoc = -1
+maxException = None
+for e in self.exprs:
+try:
+loc2 = e.tryParse( instring, loc )
+except ParseException:
+err = sys.exc_info()[1]
+if err.loc > maxExcLoc:
+maxException = err
+maxExcLoc = err.loc
+except IndexError:
+if len(instring) > maxExcLoc:
+maxException = ParseException(instring,len(instring),e.errmsg,self)
+maxExcLoc = len(instring)
+else:
+if loc2 > maxMatchLoc:
+maxMatchLoc = loc2
+maxMatchExp = e
+if maxMatchLoc < 0:
+if maxException is not None:
+raise maxException
+else:
+raise ParseException(instring, loc, "no defined alternatives to match", self)
+return maxMatchExp._parse( instring, loc, doActions )
+def __ixor__(self, other ):
+if isinstance( other, basestring ):
+other = Literal( other )
+return self.append( other ) #Or( [ self, other ] )
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+if self.strRepr is None:
+self.strRepr = "{" + " ^ ".join( [ _ustr(e) for e in self.exprs ] ) + "}"
+return self.strRepr
+def checkRecursion( self, parseElementList ):
+subRecCheckList = parseElementList[:] + [ self ]
+for e in self.exprs:
+e.checkRecursion( subRecCheckList )
+class MatchFirst(ParseExpression):
+"""Requires that at least one C{ParseExpression} is found.
+If two expressions match, the first one listed is the one that will match.
+May be constructed using the C{'|'} operator.
+"""
+def __init__( self, exprs, savelist = False ):
+super(MatchFirst,self).__init__(exprs, savelist)
+if exprs:
+self.mayReturnEmpty = False
+for e in self.exprs:
+if e.mayReturnEmpty:
+self.mayReturnEmpty = True
+break
+else:
+self.mayReturnEmpty = True
+def parseImpl( self, instring, loc, doActions=True ):
+maxExcLoc = -1
+maxException = None
+for e in self.exprs:
+try:
+ret = e._parse( instring, loc, doActions )
+return ret
+except ParseException, err:
+if err.loc > maxExcLoc:
+maxException = err
+maxExcLoc = err.loc
+except IndexError:
+if len(instring) > maxExcLoc:
+maxException = ParseException(instring,len(instring),e.errmsg,self)
+maxExcLoc = len(instring)
+# only got here if no expression matched, raise exception for match that made it the furthest
+else:
+if maxException is not None:
+raise maxException
+else:
+raise ParseException(instring, loc, "no defined alternatives to match", self)
+def __ior__(self, other ):
+if isinstance( other, basestring ):
+other = Literal( other )
+return self.append( other ) #MatchFirst( [ self, other ] )
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+if self.strRepr is None:
+self.strRepr = "{" + " | ".join( [ _ustr(e) for e in self.exprs ] ) + "}"
+return self.strRepr
+def checkRecursion( self, parseElementList ):
+subRecCheckList = parseElementList[:] + [ self ]
+for e in self.exprs:
+e.checkRecursion( subRecCheckList )
+class Each(ParseExpression):
+"""Requires all given C{ParseExpression}s to be found, but in any order.
+Expressions may be separated by whitespace.
+May be constructed using the C{'&'} operator.
+"""
+def __init__( self, exprs, savelist = True ):
+super(Each,self).__init__(exprs, savelist)
+self.mayReturnEmpty = True
+for e in self.exprs:
+if not e.mayReturnEmpty:
+self.mayReturnEmpty = False
+break
+self.skipWhitespace = True
+self.initExprGroups = True
+def parseImpl( self, instring, loc, doActions=True ):
+if self.initExprGroups:
+opt1 = [ e.expr for e in self.exprs if isinstance(e,Optional) ]
+opt2 = [ e for e in self.exprs if e.mayReturnEmpty and e not in opt1 ]
+self.optionals = opt1 + opt2
+self.multioptionals = [ e.expr for e in self.exprs if isinstance(e,ZeroOrMore) ]
+self.multirequired = [ e.expr for e in self.exprs if isinstance(e,OneOrMore) ]
+self.required = [ e for e in self.exprs if not isinstance(e,(Optional,ZeroOrMore,OneOrMore)) ]
+self.required += self.multirequired
+self.initExprGroups = False
+tmpLoc = loc
+tmpReqd = self.required[:]
+tmpOpt  = self.optionals[:]
+matchOrder = []
+keepMatching = True
+while keepMatching:
+tmpExprs = tmpReqd + tmpOpt + self.multioptionals + self.multirequired
+failed = []
+for e in tmpExprs:
+try:
+tmpLoc = e.tryParse( instring, tmpLoc )
+except ParseException:
+failed.append(e)
+else:
+matchOrder.append(e)
+if e in tmpReqd:
+tmpReqd.remove(e)
+elif e in tmpOpt:
+tmpOpt.remove(e)
+if len(failed) == len(tmpExprs):
+keepMatching = False
+if tmpReqd:
+missing = ", ".join( [ _ustr(e) for e in tmpReqd ] )
+raise ParseException(instring,loc,"Missing one or more required elements (%s)" % missing )
+# add any unmatched Optionals, in case they have default values defined
+matchOrder += [e for e in self.exprs if isinstance(e,Optional) and e.expr in tmpOpt]
+resultlist = []
+for e in matchOrder:
+loc,results = e._parse(instring,loc,doActions)
+resultlist.append(results)
+finalResults = ParseResults([])
+for r in resultlist:
+dups = {}
+for k in r.keys():
+if k in finalResults.keys():
+tmp = ParseResults(finalResults[k])
+tmp += ParseResults(r[k])
+dups[k] = tmp
+finalResults += ParseResults(r)
+for k,v in dups.items():
+finalResults[k] = v
+return loc, finalResults
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+if self.strRepr is None:
+self.strRepr = "{" + " & ".join( [ _ustr(e) for e in self.exprs ] ) + "}"
+return self.strRepr
+def checkRecursion( self, parseElementList ):
+subRecCheckList = parseElementList[:] + [ self ]
+for e in self.exprs:
+e.checkRecursion( subRecCheckList )
+class ParseElementEnhance(ParserElement):
+"""Abstract subclass of C{ParserElement}, for combining and post-processing parsed tokens."""
+def __init__( self, expr, savelist=False ):
+super(ParseElementEnhance,self).__init__(savelist)
+if isinstance( expr, basestring ):
+expr = Literal(expr)
+self.expr = expr
+self.strRepr = None
+if expr is not None:
+self.mayIndexError = expr.mayIndexError
+self.mayReturnEmpty = expr.mayReturnEmpty
+self.setWhitespaceChars( expr.whiteChars )
+self.skipWhitespace = expr.skipWhitespace
+self.saveAsList = expr.saveAsList
+self.callPreparse = expr.callPreparse
+self.ignoreExprs.extend(expr.ignoreExprs)
+def parseImpl( self, instring, loc, doActions=True ):
+if self.expr is not None:
+return self.expr._parse( instring, loc, doActions, callPreParse=False )
+else:
+raise ParseException("",loc,self.errmsg,self)
+def leaveWhitespace( self ):
+self.skipWhitespace = False
+self.expr = self.expr.copy()
+if self.expr is not None:
+self.expr.leaveWhitespace()
+return self
+def ignore( self, other ):
+if isinstance( other, Suppress ):
+if other not in self.ignoreExprs:
+super( ParseElementEnhance, self).ignore( other )
+if self.expr is not None:
+self.expr.ignore( self.ignoreExprs[-1] )
+else:
+super( ParseElementEnhance, self).ignore( other )
+if self.expr is not None:
+self.expr.ignore( self.ignoreExprs[-1] )
+return self
+def streamline( self ):
+super(ParseElementEnhance,self).streamline()
+if self.expr is not None:
+self.expr.streamline()
+return self
+def checkRecursion( self, parseElementList ):
+if self in parseElementList:
+raise RecursiveGrammarException( parseElementList+[self] )
+subRecCheckList = parseElementList[:] + [ self ]
+if self.expr is not None:
+self.expr.checkRecursion( subRecCheckList )
+def validate( self, validateTrace=[] ):
+tmp = validateTrace[:]+[self]
+if self.expr is not None:
+self.expr.validate(tmp)
+self.checkRecursion( [] )
+def __str__( self ):
+try:
+return super(ParseElementEnhance,self).__str__()
+except:
+pass
+if self.strRepr is None and self.expr is not None:
+self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.expr) )
+return self.strRepr
+class FollowedBy(ParseElementEnhance):
+"""Lookahead matching of the given parse expression.  C{FollowedBy}
+does *not* advance the parsing position within the input string, it only
+verifies that the specified parse expression matches at the current
+position.  C{FollowedBy} always returns a null token list."""
+def __init__( self, expr ):
+super(FollowedBy,self).__init__(expr)
+self.mayReturnEmpty = True
+def parseImpl( self, instring, loc, doActions=True ):
+self.expr.tryParse( instring, loc )
+return loc, []
+class NotAny(ParseElementEnhance):
+"""Lookahead to disallow matching with the given parse expression.  C{NotAny}
+does *not* advance the parsing position within the input string, it only
+verifies that the specified parse expression does *not* match at the current
+position.  Also, C{NotAny} does *not* skip over leading whitespace. C{NotAny}
+always returns a null token list.  May be constructed using the '~' operator."""
+def __init__( self, expr ):
+super(NotAny,self).__init__(expr)
+#~ self.leaveWhitespace()
+self.skipWhitespace = False  # do NOT use self.leaveWhitespace(), don't want to propagate to exprs
+self.mayReturnEmpty = True
+self.errmsg = "Found unwanted token, "+_ustr(self.expr)
+def parseImpl( self, instring, loc, doActions=True ):
+try:
+self.expr.tryParse( instring, loc )
+except (ParseException,IndexError):
+pass
+else:
+#~ raise ParseException(instring, loc, self.errmsg )
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+return loc, []
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+if self.strRepr is None:
+self.strRepr = "~{" + _ustr(self.expr) + "}"
+return self.strRepr
+class ZeroOrMore(ParseElementEnhance):
+"""Optional repetition of zero or more of the given expression."""
+def __init__( self, expr ):
+super(ZeroOrMore,self).__init__(expr)
+self.mayReturnEmpty = True
+def parseImpl( self, instring, loc, doActions=True ):
+tokens = []
+try:
+loc, tokens = self.expr._parse( instring, loc, doActions, callPreParse=False )
+hasIgnoreExprs = ( len(self.ignoreExprs) > 0 )
+while 1:
+if hasIgnoreExprs:
+preloc = self._skipIgnorables( instring, loc )
+else:
+preloc = loc
+loc, tmptokens = self.expr._parse( instring, preloc, doActions )
+if tmptokens or tmptokens.keys():
+tokens += tmptokens
+except (ParseException,IndexError):
+pass
+return loc, tokens
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+if self.strRepr is None:
+self.strRepr = "[" + _ustr(self.expr) + "]..."
+return self.strRepr
+def setResultsName( self, name, listAllMatches=False ):
+ret = super(ZeroOrMore,self).setResultsName(name,listAllMatches)
+ret.saveAsList = True
+return ret
+class OneOrMore(ParseElementEnhance):
+"""Repetition of one or more of the given expression."""
+def parseImpl( self, instring, loc, doActions=True ):
+# must be at least one
+loc, tokens = self.expr._parse( instring, loc, doActions, callPreParse=False )
+try:
+hasIgnoreExprs = ( len(self.ignoreExprs) > 0 )
+while 1:
+if hasIgnoreExprs:
+preloc = self._skipIgnorables( instring, loc )
+else:
+preloc = loc
+loc, tmptokens = self.expr._parse( instring, preloc, doActions )
+if tmptokens or tmptokens.keys():
+tokens += tmptokens
+except (ParseException,IndexError):
+pass
+return loc, tokens
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+if self.strRepr is None:
+self.strRepr = "{" + _ustr(self.expr) + "}..."
+return self.strRepr
+def setResultsName( self, name, listAllMatches=False ):
+ret = super(OneOrMore,self).setResultsName(name,listAllMatches)
+ret.saveAsList = True
+return ret
+class _NullToken(object):
+def __bool__(self):
+return False
+__nonzero__ = __bool__
+def __str__(self):
+return ""
+_optionalNotMatched = _NullToken()
+class Optional(ParseElementEnhance):
+"""Optional matching of the given expression.
+A default return string can also be specified, if the optional expression
+is not found.
+"""
+def __init__( self, exprs, default=_optionalNotMatched ):
+super(Optional,self).__init__( exprs, savelist=False )
+self.defaultValue = default
+self.mayReturnEmpty = True
+def parseImpl( self, instring, loc, doActions=True ):
+try:
+loc, tokens = self.expr._parse( instring, loc, doActions, callPreParse=False )
+except (ParseException,IndexError):
+if self.defaultValue is not _optionalNotMatched:
+if self.expr.resultsName:
+tokens = ParseResults([ self.defaultValue ])
+tokens[self.expr.resultsName] = self.defaultValue
+else:
+tokens = [ self.defaultValue ]
+else:
+tokens = []
+return loc, tokens
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+if self.strRepr is None:
+self.strRepr = "[" + _ustr(self.expr) + "]"
+return self.strRepr
+class SkipTo(ParseElementEnhance):
+"""Token for skipping over all undefined text until the matched expression is found.
+If C{include} is set to true, the matched expression is also parsed (the skipped text
+and matched expression are returned as a 2-element list).  The C{ignore}
+argument is used to define grammars (typically quoted strings and comments) that
+might contain false matches.
+"""
+def __init__( self, other, include=False, ignore=None, failOn=None ):
+super( SkipTo, self ).__init__( other )
+self.ignoreExpr = ignore
+self.mayReturnEmpty = True
+self.mayIndexError = False
+self.includeMatch = include
+self.asList = False
+if failOn is not None and isinstance(failOn, basestring):
+self.failOn = Literal(failOn)
+else:
+self.failOn = failOn
+self.errmsg = "No match found for "+_ustr(self.expr)
+def parseImpl( self, instring, loc, doActions=True ):
+startLoc = loc
+instrlen = len(instring)
+expr = self.expr
+failParse = False
+while loc <= instrlen:
+try:
+if self.failOn:
+try:
+self.failOn.tryParse(instring, loc)
+except ParseBaseException:
+pass
+else:
+failParse = True
+raise ParseException(instring, loc, "Found expression " + str(self.failOn))
+failParse = False
+if self.ignoreExpr is not None:
+while 1:
+try:
+loc = self.ignoreExpr.tryParse(instring,loc)
+# print "found ignoreExpr, advance to", loc
+except ParseBaseException:
+break
+expr._parse( instring, loc, doActions=False, callPreParse=False )
+skipText = instring[startLoc:loc]
+if self.includeMatch:
+loc,mat = expr._parse(instring,loc,doActions,callPreParse=False)
+if mat:
+skipRes = ParseResults( skipText )
+skipRes += mat
+return loc, [ skipRes ]
+else:
+return loc, [ skipText ]
+else:
+return loc, [ skipText ]
+except (ParseException,IndexError):
+if failParse:
+raise
+else:
+loc += 1
+exc = self.myException
+exc.loc = loc
+exc.pstr = instring
+raise exc
+class Forward(ParseElementEnhance):
+"""Forward declaration of an expression to be defined later -
+used for recursive grammars, such as algebraic infix notation.
+When the expression is known, it is assigned to the C{Forward} variable using the '<<' operator.
+Note: take care when assigning to C{Forward} not to overlook precedence of operators.
+Specifically, '|' has a lower precedence than '<<', so that::
+fwdExpr << a | b | c
+will actually be evaluated as::
+(fwdExpr << a) | b | c
+thereby leaving b and c out as parseable alternatives.  It is recommended that you
+explicitly group the values inserted into the C{Forward}::
+fwdExpr << (a | b | c)
+"""
+def __init__( self, other=None ):
+super(Forward,self).__init__( other, savelist=False )
+def __lshift__( self, other ):
+if isinstance( other, basestring ):
+other = Literal(other)
+self.expr = other
+self.mayReturnEmpty = other.mayReturnEmpty
+self.strRepr = None
+self.mayIndexError = self.expr.mayIndexError
+self.mayReturnEmpty = self.expr.mayReturnEmpty
+self.setWhitespaceChars( self.expr.whiteChars )
+self.skipWhitespace = self.expr.skipWhitespace
+self.saveAsList = self.expr.saveAsList
+self.ignoreExprs.extend(self.expr.ignoreExprs)
+return None
+def leaveWhitespace( self ):
+self.skipWhitespace = False
+return self
+def streamline( self ):
+if not self.streamlined:
+self.streamlined = True
+if self.expr is not None:
+self.expr.streamline()
+return self
+def validate( self, validateTrace=[] ):
+if self not in validateTrace:
+tmp = validateTrace[:]+[self]
+if self.expr is not None:
+self.expr.validate(tmp)
+self.checkRecursion([])
+def __str__( self ):
+if hasattr(self,"name"):
+return self.name
+self._revertClass = self.__class__
+self.__class__ = _ForwardNoRecurse
+try:
+if self.expr is not None:
+retString = _ustr(self.expr)
+else:
+retString = "None"
+finally:
+self.__class__ = self._revertClass
+return self.__class__.__name__ + ": " + retString
+def copy(self):
+if self.expr is not None:
+return super(Forward,self).copy()
+else:
+ret = Forward()
+ret << self
+return ret
+class _ForwardNoRecurse(Forward):
+def __str__( self ):
+return "..."
+class TokenConverter(ParseElementEnhance):
+"""Abstract subclass of C{ParseExpression}, for converting parsed results."""
+def __init__( self, expr, savelist=False ):
+super(TokenConverter,self).__init__( expr )#, savelist )
+self.saveAsList = False
+class Upcase(TokenConverter):
+"""Converter to upper case all matching tokens."""
+def __init__(self, *args):
+super(Upcase,self).__init__(*args)
+warnings.warn("Upcase class is deprecated, use upcaseTokens parse action instead",
+DeprecationWarning,stacklevel=2)
+def postParse( self, instring, loc, tokenlist ):
+return list(map( string.upper, tokenlist ))
+class Combine(TokenConverter):
+"""Converter to concatenate all matching tokens to a single string.
+By default, the matching patterns must also be contiguous in the input string;
+this can be disabled by specifying C{'adjacent=False'} in the constructor.
+"""
+def __init__( self, expr, joinString="", adjacent=True ):
+super(Combine,self).__init__( expr )
+# suppress whitespace-stripping in contained parse expressions, but re-enable it on the Combine itself
+if adjacent:
+self.leaveWhitespace()
+self.adjacent = adjacent
+self.skipWhitespace = True
+self.joinString = joinString
+self.callPreparse = True
+def ignore( self, other ):
+if self.adjacent:
+ParserElement.ignore(self, other)
+else:
+super( Combine, self).ignore( other )
+return self
+def postParse( self, instring, loc, tokenlist ):
+retToks = tokenlist.copy()
+del retToks[:]
+retToks += ParseResults([ "".join(tokenlist._asStringList(self.joinString)) ], modal=self.modalResults)
+if self.resultsName and len(retToks.keys())>0:
+return [ retToks ]
+else:
+return retToks
+class Group(TokenConverter):
+"""Converter to return the matched tokens as a list - useful for returning tokens of C{ZeroOrMore} and C{OneOrMore} expressions."""
+def __init__( self, expr ):
+super(Group,self).__init__( expr )
+self.saveAsList = True
+def postParse( self, instring, loc, tokenlist ):
+return [ tokenlist ]
+class Dict(TokenConverter):
+"""Converter to return a repetitive expression as a list, but also as a dictionary.
+Each element can also be referenced using the first token in the expression as its key.
+Useful for tabular report scraping when the first column can be used as a item key.
+"""
+def __init__( self, exprs ):
+super(Dict,self).__init__( exprs )
+self.saveAsList = True
+def postParse( self, instring, loc, tokenlist ):
+for i,tok in enumerate(tokenlist):
+if len(tok) == 0:
+continue
+ikey = tok[0]
+if isinstance(ikey,int):
+ikey = _ustr(tok[0]).strip()
+if len(tok)==1:
+tokenlist[ikey] = _ParseResultsWithOffset("",i)
+elif len(tok)==2 and not isinstance(tok[1],ParseResults):
+tokenlist[ikey] = _ParseResultsWithOffset(tok[1],i)
+else:
+dictvalue = tok.copy() #ParseResults(i)
+del dictvalue[0]
+if len(dictvalue)!= 1 or (isinstance(dictvalue,ParseResults) and dictvalue.keys()):
+tokenlist[ikey] = _ParseResultsWithOffset(dictvalue,i)
+else:
+tokenlist[ikey] = _ParseResultsWithOffset(dictvalue[0],i)
+if self.resultsName:
+return [ tokenlist ]
+else:
+return tokenlist
+class Suppress(TokenConverter):
+"""Converter for ignoring the results of a parsed expression."""
+def postParse( self, instring, loc, tokenlist ):
+return []
+def suppress( self ):
+return self
+class OnlyOnce(object):
+"""Wrapper for parse actions, to ensure they are only called once."""
+def __init__(self, methodCall):
+self.callable = _trim_arity(methodCall)
+self.called = False
+def __call__(self,s,l,t):
+if not self.called:
+results = self.callable(s,l,t)
+self.called = True
+return results
+raise ParseException(s,l,"")
+def reset(self):
+self.called = False
+def traceParseAction(f):
+"""Decorator for debugging parse actions."""
+f = _trim_arity(f)
+def z(*paArgs):
+thisFunc = f.func_name
+s,l,t = paArgs[-3:]
+if len(paArgs)>3:
+thisFunc = paArgs[0].__class__.__name__ + '.' + thisFunc
+sys.stderr.write( ">>entering %s(line: '%s', %d, %s)\n" % (thisFunc,line(l,s),l,t) )
+try:
+ret = f(*paArgs)
+except Exception:
+exc = sys.exc_info()[1]
+sys.stderr.write( "<<leaving %s (exception: %s)\n" % (thisFunc,exc) )
+raise
+sys.stderr.write( "<<leaving %s (ret: %s)\n" % (thisFunc,ret) )
+return ret
+try:
+z.__name__ = f.__name__
+except AttributeError:
+pass
+return z
+#
+# global helpers
+#
+def delimitedList( expr, delim=",", combine=False ):
+"""Helper to define a delimited list of expressions - the delimiter defaults to ','.
+By default, the list elements and delimiters can have intervening whitespace, and
+comments, but this can be overridden by passing C{combine=True} in the constructor.
+If C{combine} is set to True, the matching tokens are returned as a single token
+string, with the delimiters included; otherwise, the matching tokens are returned
+as a list of tokens, with the delimiters suppressed.
+"""
+dlName = _ustr(expr)+" ["+_ustr(delim)+" "+_ustr(expr)+"]..."
+if combine:
+return Combine( expr + ZeroOrMore( delim + expr ) ).setName(dlName)
+else:
+return ( expr + ZeroOrMore( Suppress( delim ) + expr ) ).setName(dlName)
+def countedArray( expr, intExpr=None ):
+"""Helper to define a counted list of expressions.
+This helper defines a pattern of the form::
+integer expr expr expr...
+where the leading integer tells how many expr expressions follow.
+The matched tokens returns the array of expr tokens as a list - the leading count token is suppressed.
+"""
+arrayExpr = Forward()
+def countFieldParseAction(s,l,t):
+n = t[0]
+arrayExpr << (n and Group(And([expr]*n)) or Group(empty))
+return []
+if intExpr is None:
+intExpr = Word(nums).setParseAction(lambda t:int(t[0]))
+else:
+intExpr = intExpr.copy()
+intExpr.setName("arrayLen")
+intExpr.addParseAction(countFieldParseAction, callDuringTry=True)
+return ( intExpr + arrayExpr )
+def _flatten(L):
+ret = []
+for i in L:
+if isinstance(i,list):
+ret.extend(_flatten(i))
+else:
+ret.append(i)
+return ret
+def matchPreviousLiteral(expr):
+"""Helper to define an expression that is indirectly defined from
+the tokens matched in a previous expression, that is, it looks
+for a 'repeat' of a previous expression.  For example::
+first = Word(nums)
+second = matchPreviousLiteral(first)
+matchExpr = first + ":" + second
+will match C{"1:1"}, but not C{"1:2"}.  Because this matches a
+previous literal, will also match the leading C{"1:1"} in C{"1:10"}.
+If this is not desired, use C{matchPreviousExpr}.
+Do *not* use with packrat parsing enabled.
+"""
+rep = Forward()
+def copyTokenToRepeater(s,l,t):
+if t:
+if len(t) == 1:
+rep << t[0]
+else:
+# flatten t tokens
+tflat = _flatten(t.asList())
+rep << And( [ Literal(tt) for tt in tflat ] )
+else:
+rep << Empty()
+expr.addParseAction(copyTokenToRepeater, callDuringTry=True)
+return rep
+def matchPreviousExpr(expr):
+"""Helper to define an expression that is indirectly defined from
+the tokens matched in a previous expression, that is, it looks
+for a 'repeat' of a previous expression.  For example::
+first = Word(nums)
+second = matchPreviousExpr(first)
+matchExpr = first + ":" + second
+will match C{"1:1"}, but not C{"1:2"}.  Because this matches by
+expressions, will *not* match the leading C{"1:1"} in C{"1:10"};
+the expressions are evaluated first, and then compared, so
+C{"1"} is compared with C{"10"}.
+Do *not* use with packrat parsing enabled.
+"""
+rep = Forward()
+e2 = expr.copy()
+rep << e2
+def copyTokenToRepeater(s,l,t):
+matchTokens = _flatten(t.asList())
+def mustMatchTheseTokens(s,l,t):
+theseTokens = _flatten(t.asList())
+if  theseTokens != matchTokens:
+raise ParseException("",0,"")
+rep.setParseAction( mustMatchTheseTokens, callDuringTry=True )
+expr.addParseAction(copyTokenToRepeater, callDuringTry=True)
+return rep
+def _escapeRegexRangeChars(s):
+#~  escape these chars: ^-]
+for c in r"\^-]":
+s = s.replace(c,_bslash+c)
+s = s.replace("\n",r"\n")
+s = s.replace("\t",r"\t")
+return _ustr(s)
+def oneOf( strs, caseless=False, useRegex=True ):
+"""Helper to quickly define a set of alternative Literals, and makes sure to do
+longest-first testing when there is a conflict, regardless of the input order,
+but returns a C{MatchFirst} for best performance.
+Parameters:
+- strs - a string of space-delimited literals, or a list of string literals
+- caseless - (default=False) - treat all literals as caseless
+- useRegex - (default=True) - as an optimization, will generate a Regex
+object; otherwise, will generate a C{MatchFirst} object (if C{caseless=True}, or
+if creating a C{Regex} raises an exception)
+"""
+if caseless:
+isequal = ( lambda a,b: a.upper() == b.upper() )
+masks = ( lambda a,b: b.upper().startswith(a.upper()) )
+parseElementClass = CaselessLiteral
+else:
+isequal = ( lambda a,b: a == b )
+masks = ( lambda a,b: b.startswith(a) )
+parseElementClass = Literal
+if isinstance(strs,(list,tuple)):
+symbols = list(strs[:])
+elif isinstance(strs,basestring):
+symbols = strs.split()
+else:
+warnings.warn("Invalid argument to oneOf, expected string or list",
+SyntaxWarning, stacklevel=2)
+i = 0
+while i < len(symbols)-1:
+cur = symbols[i]
+for j,other in enumerate(symbols[i+1:]):
+if ( isequal(other, cur) ):
+del symbols[i+j+1]
+break
+elif ( masks(cur, other) ):
+del symbols[i+j+1]
+symbols.insert(i,other)
+cur = other
+break
+else:
+i += 1
+if not caseless and useRegex:
+#~ print (strs,"->", "|".join( [ _escapeRegexChars(sym) for sym in symbols] ))
+try:
+if len(symbols)==len("".join(symbols)):
+return Regex( "[%s]" % "".join( [ _escapeRegexRangeChars(sym) for sym in symbols] ) )
+else:
+return Regex( "|".join( [ re.escape(sym) for sym in symbols] ) )
+except:
+warnings.warn("Exception creating Regex for oneOf, building MatchFirst",
+SyntaxWarning, stacklevel=2)
+# last resort, just use MatchFirst
+return MatchFirst( [ parseElementClass(sym) for sym in symbols ] )
+def dictOf( key, value ):
+"""Helper to easily and clearly define a dictionary by specifying the respective patterns
+for the key and value.  Takes care of defining the C{Dict}, C{ZeroOrMore}, and C{Group} tokens
+in the proper order.  The key pattern can include delimiting markers or punctuation,
+as long as they are suppressed, thereby leaving the significant key text.  The value
+pattern can include named results, so that the C{Dict} results can include named token
+fields.
+"""
+return Dict( ZeroOrMore( Group ( key + value ) ) )
+def originalTextFor(expr, asString=True):
+"""Helper to return the original, untokenized text for a given expression.  Useful to
+restore the parsed fields of an HTML start tag into the raw tag text itself, or to
+revert separate tokens with intervening whitespace back to the original matching
+input text. Simpler to use than the parse action C{L{keepOriginalText}}, and does not
+require the inspect module to chase up the call stack.  By default, returns a
+string containing the original parsed text.
+If the optional C{asString} argument is passed as C{False}, then the return value is a
+C{ParseResults} containing any results names that were originally matched, and a
+single token containing the original matched text from the input string.  So if
+the expression passed to C{L{originalTextFor}} contains expressions with defined
+results names, you must set C{asString} to C{False} if you want to preserve those
+results name values."""
+locMarker = Empty().setParseAction(lambda s,loc,t: loc)
+endlocMarker = locMarker.copy()
+endlocMarker.callPreparse = False
+matchExpr = locMarker("_original_start") + expr + endlocMarker("_original_end")
+if asString:
+extractText = lambda s,l,t: s[t._original_start:t._original_end]
+else:
+def extractText(s,l,t):
+del t[:]
+t.insert(0, s[t._original_start:t._original_end])
+del t["_original_start"]
+del t["_original_end"]
+matchExpr.setParseAction(extractText)
+return matchExpr
+def ungroup(expr):
+"""Helper to undo pyparsing's default grouping of And expressions, even
+if all but one are non-empty."""
+return TokenConverter(expr).setParseAction(lambda t:t[0])
+# convenience constants for positional expressions
+empty       = Empty().setName("empty")
+lineStart   = LineStart().setName("lineStart")
+lineEnd     = LineEnd().setName("lineEnd")
+stringStart = StringStart().setName("stringStart")
+stringEnd   = StringEnd().setName("stringEnd")
+_escapedPunc = Word( _bslash, r"\[]-*.$+^?()~ ", exact=2 ).setParseAction(lambda s,l,t:t[0][1])
+_printables_less_backslash = "".join([ c for c in printables if c not in  r"\]" ])
+_escapedHexChar = Regex(r"\\0?[xX][0-9a-fA-F]+").setParseAction(lambda s,l,t:unichr(int(t[0][1:],16)))
+_escapedOctChar = Regex(r"\\0[0-7]+").setParseAction(lambda s,l,t:unichr(int(t[0][1:],8)))
+_singleChar = _escapedPunc | _escapedHexChar | _escapedOctChar | Word(_printables_less_backslash,exact=1)
+_charRange = Group(_singleChar + Suppress("-") + _singleChar)
+_reBracketExpr = Literal("[") + Optional("^").setResultsName("negate") + Group( OneOrMore( _charRange | _singleChar ) ).setResultsName("body") + "]"
+_expanded = lambda p: (isinstance(p,ParseResults) and ''.join([ unichr(c) for c in range(ord(p[0]),ord(p[1])+1) ]) or p)
+def srange(s):
+r"""Helper to easily define string ranges for use in Word construction.  Borrows
+syntax from regexp '[]' string range definitions::
+srange("[0-9]")   -> "0123456789"
+srange("[a-z]")   -> "abcdefghijklmnopqrstuvwxyz"
+srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_"
+The input string must be enclosed in []'s, and the returned string is the expanded
+character set joined into a single string.
+The values enclosed in the []'s may be::
+a single character
+an escaped character with a leading backslash (such as \- or \])
+an escaped hex character with a leading '\x' (\x21, which is a '!' character)
+(\0x## is also supported for backwards compatibility)
+an escaped octal character with a leading '\0' (\041, which is a '!' character)
+a range of any of the above, separated by a dash ('a-z', etc.)
+any combination of the above ('aeiouy', 'a-zA-Z0-9_$', etc.)
+"""
+try:
+return "".join([_expanded(part) for part in _reBracketExpr.parseString(s).body])
+except:
+return ""
+def matchOnlyAtCol(n):
+"""Helper method for defining parse actions that require matching at a specific
+column in the input text.
+"""
+def verifyCol(strg,locn,toks):
+if col(locn,strg) != n:
+raise ParseException(strg,locn,"matched token not at column %d" % n)
+return verifyCol
+def replaceWith(replStr):
+"""Helper method for common parse actions that simply return a literal value.  Especially
+useful when used with C{transformString()}.
+"""
+def _replFunc(*args):
+return [replStr]
+return _replFunc
+def removeQuotes(s,l,t):
+"""Helper parse action for removing quotation marks from parsed quoted strings.
+To use, add this parse action to quoted string using::
+quotedString.setParseAction( removeQuotes )
+"""
+return t[0][1:-1]
+def upcaseTokens(s,l,t):
+"""Helper parse action to convert tokens to upper case."""
+return [ tt.upper() for tt in map(_ustr,t) ]
+def downcaseTokens(s,l,t):
+"""Helper parse action to convert tokens to lower case."""
+return [ tt.lower() for tt in map(_ustr,t) ]
+def keepOriginalText(s,startLoc,t):
+"""DEPRECATED - use new helper method C{originalTextFor}.
+Helper parse action to preserve original parsed text,
+overriding any nested parse actions."""
+try:
+endloc = getTokensEndLoc()
+except ParseException:
+raise ParseFatalException("incorrect usage of keepOriginalText - may only be called as a parse action")
+del t[:]
+t += ParseResults(s[startLoc:endloc])
+return t
+def getTokensEndLoc():
+"""Method to be called from within a parse action to determine the end
+location of the parsed tokens."""
+import inspect
+fstack = inspect.stack()
+try:
+# search up the stack (through intervening argument normalizers) for correct calling routine
+for f in fstack[2:]:
+if f[3] == "_parseNoCache":
+endloc = f[0].f_locals["loc"]
+return endloc
+else:
+raise ParseFatalException("incorrect usage of getTokensEndLoc - may only be called from within a parse action")
+finally:
+del fstack
+def _makeTags(tagStr, xml):
+"""Internal helper to construct opening and closing tag expressions, given a tag name"""
+if isinstance(tagStr,basestring):
+resname = tagStr
+tagStr = Keyword(tagStr, caseless=not xml)
+else:
+resname = tagStr.name
+tagAttrName = Word(alphas,alphanums+"_-:")
+if (xml):
+tagAttrValue = dblQuotedString.copy().setParseAction( removeQuotes )
+openTag = Suppress("<") + tagStr("tag") + \
+Dict(ZeroOrMore(Group( tagAttrName + Suppress("=") + tagAttrValue ))) + \
+Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">")
+else:
+printablesLessRAbrack = "".join( [ c for c in printables if c not in ">" ] )
+tagAttrValue = quotedString.copy().setParseAction( removeQuotes ) | Word(printablesLessRAbrack)
+openTag = Suppress("<") + tagStr("tag") + \
+Dict(ZeroOrMore(Group( tagAttrName.setParseAction(downcaseTokens) + \
+Optional( Suppress("=") + tagAttrValue ) ))) + \
+Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">")
+closeTag = Combine(_L("</") + tagStr + ">")
+openTag = openTag.setResultsName("start"+"".join(resname.replace(":"," ").title().split())).setName("<%s>" % tagStr)
+closeTag = closeTag.setResultsName("end"+"".join(resname.replace(":"," ").title().split())).setName("</%s>" % tagStr)
+openTag.tag = resname
+closeTag.tag = resname
+return openTag, closeTag
+def makeHTMLTags(tagStr):
+"""Helper to construct opening and closing tag expressions for HTML, given a tag name"""
+return _makeTags( tagStr, False )
+def makeXMLTags(tagStr):
+"""Helper to construct opening and closing tag expressions for XML, given a tag name"""
+return _makeTags( tagStr, True )
+def withAttribute(*args,**attrDict):
+"""Helper to create a validating parse action to be used with start tags created
+with C{makeXMLTags} or C{makeHTMLTags}. Use C{withAttribute} to qualify a starting tag
+with a required attribute value, to avoid false matches on common tags such as
+C{<TD>} or C{<DIV>}.
+Call C{withAttribute} with a series of attribute names and values. Specify the list
+of filter attributes names and values as:
+- keyword arguments, as in C{(align="right")}, or
+- as an explicit dict with C{**} operator, when an attribute name is also a Python
+reserved word, as in C{**{"class":"Customer", "align":"right"}}
+- a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") )
+For attribute names with a namespace prefix, you must use the second form.  Attribute
+names are matched insensitive to upper/lower case.
+To verify that the attribute exists, but without specifying a value, pass
+C{withAttribute.ANY_VALUE} as the value.
+"""
+if args:
+attrs = args[:]
+else:
+attrs = attrDict.items()
+attrs = [(k,v) for k,v in attrs]
+def pa(s,l,tokens):
+for attrName,attrValue in attrs:
+if attrName not in tokens:
+raise ParseException(s,l,"no matching attribute " + attrName)
+if attrValue != withAttribute.ANY_VALUE and tokens[attrName] != attrValue:
+raise ParseException(s,l,"attribute '%s' has value '%s', must be '%s'" %
+(attrName, tokens[attrName], attrValue))
+return pa
+withAttribute.ANY_VALUE = object()
+opAssoc = _Constants()
+opAssoc.LEFT = object()
+opAssoc.RIGHT = object()
+def operatorPrecedence( baseExpr, opList ):
+"""Helper method for constructing grammars of expressions made up of
+operators working in a precedence hierarchy.  Operators may be unary or
+binary, left- or right-associative.  Parse actions can also be attached
+to operator expressions.
+Parameters:
+- baseExpr - expression representing the most basic element for the nested
+- opList - list of tuples, one for each operator precedence level in the
+expression grammar; each tuple is of the form
+(opExpr, numTerms, rightLeftAssoc, parseAction), where:
+- opExpr is the pyparsing expression for the operator;
+may also be a string, which will be converted to a Literal;
+if numTerms is 3, opExpr is a tuple of two expressions, for the
+two operators separating the 3 terms
+- numTerms is the number of terms for this operator (must
+be 1, 2, or 3)
+- rightLeftAssoc is the indicator whether the operator is
+right or left associative, using the pyparsing-defined
+constants opAssoc.RIGHT and opAssoc.LEFT.
+- parseAction is the parse action to be associated with
+expressions matching this operator expression (the
+parse action tuple member may be omitted)
+"""
+ret = Forward()
+lastExpr = baseExpr | ( Suppress('(') + ret + Suppress(')') )
+for i,operDef in enumerate(opList):
+opExpr,arity,rightLeftAssoc,pa = (operDef + (None,))[:4]
+if arity == 3:
+if opExpr is None or len(opExpr) != 2:
+raise ValueError("if numterms=3, opExpr must be a tuple or list of two expressions")
+opExpr1, opExpr2 = opExpr
+thisExpr = Forward()#.setName("expr%d" % i)
+if rightLeftAssoc == opAssoc.LEFT:
+if arity == 1:
+matchExpr = FollowedBy(lastExpr + opExpr) + Group( lastExpr + OneOrMore( opExpr ) )
+elif arity == 2:
+if opExpr is not None:
+matchExpr = FollowedBy(lastExpr + opExpr + lastExpr) + Group( lastExpr + OneOrMore( opExpr + lastExpr ) )
+else:
+matchExpr = FollowedBy(lastExpr+lastExpr) + Group( lastExpr + OneOrMore(lastExpr) )
+elif arity == 3:
+matchExpr = FollowedBy(lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr) + \
+Group( lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr )
+else:
+raise ValueError("operator must be unary (1), binary (2), or ternary (3)")
+elif rightLeftAssoc == opAssoc.RIGHT:
+if arity == 1:
+# try to avoid LR with this extra test
+if not isinstance(opExpr, Optional):
+opExpr = Optional(opExpr)
+matchExpr = FollowedBy(opExpr.expr + thisExpr) + Group( opExpr + thisExpr )
+elif arity == 2:
+if opExpr is not None:
+matchExpr = FollowedBy(lastExpr + opExpr + thisExpr) + Group( lastExpr + OneOrMore( opExpr + thisExpr ) )
+else:
+matchExpr = FollowedBy(lastExpr + thisExpr) + Group( lastExpr + OneOrMore( thisExpr ) )
+elif arity == 3:
+matchExpr = FollowedBy(lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr) + \
+Group( lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr )
+else:
+raise ValueError("operator must be unary (1), binary (2), or ternary (3)")
+else:
+raise ValueError("operator must indicate right or left associativity")
+if pa:
+matchExpr.setParseAction( pa )
+thisExpr << ( matchExpr | lastExpr )
+lastExpr = thisExpr
+ret << lastExpr
+return ret
+dblQuotedString = Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\x[0-9a-fA-F]+)|(?:\\.))*"').setName("string enclosed in double quotes")
+sglQuotedString = Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\x[0-9a-fA-F]+)|(?:\\.))*'").setName("string enclosed in single quotes")
+quotedString = Regex(r'''(?:"(?:[^"\n\r\\]|(?:"")|(?:\\x[0-9a-fA-F]+)|(?:\\.))*")|(?:'(?:[^'\n\r\\]|(?:'')|(?:\\x[0-9a-fA-F]+)|(?:\\.))*')''').setName("quotedString using single or double quotes")
+unicodeString = Combine(_L('u') + quotedString.copy())
+def nestedExpr(opener="(", closer=")", content=None, ignoreExpr=quotedString.copy()):
+"""Helper method for defining nested lists enclosed in opening and closing
+delimiters ("(" and ")" are the default).
+Parameters:
+- opener - opening character for a nested list (default="("); can also be a pyparsing expression
+- closer - closing character for a nested list (default=")"); can also be a pyparsing expression
+- content - expression for items within the nested lists (default=None)
+- ignoreExpr - expression for ignoring opening and closing delimiters (default=quotedString)
+If an expression is not provided for the content argument, the nested
+expression will capture all whitespace-delimited content between delimiters
+as a list of separate values.
+Use the C{ignoreExpr} argument to define expressions that may contain
+opening or closing characters that should not be treated as opening
+or closing characters for nesting, such as quotedString or a comment
+expression.  Specify multiple expressions using an C{L{Or}} or C{L{MatchFirst}}.
+The default is L{quotedString}, but if no expressions are to be ignored,
+then pass C{None} for this argument.
+"""
+if opener == closer:
+raise ValueError("opening and closing strings cannot be the same")
+if content is None:
+if isinstance(opener,basestring) and isinstance(closer,basestring):
+if len(opener) == 1 and len(closer)==1:
+if ignoreExpr is not None:
+content = (Combine(OneOrMore(~ignoreExpr +
+CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS,exact=1))
+).setParseAction(lambda t:t[0].strip()))
+else:
+content = (empty.copy()+CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS
+).setParseAction(lambda t:t[0].strip()))
+else:
+if ignoreExpr is not None:
+content = (Combine(OneOrMore(~ignoreExpr +
+~Literal(opener) + ~Literal(closer) +
+CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1))
+).setParseAction(lambda t:t[0].strip()))
+else:
+content = (Combine(OneOrMore(~Literal(opener) + ~Literal(closer) +
+CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1))
+).setParseAction(lambda t:t[0].strip()))
+else:
+raise ValueError("opening and closing arguments must be strings if no content expression is given")
+ret = Forward()
+if ignoreExpr is not None:
+ret << Group( Suppress(opener) + ZeroOrMore( ignoreExpr | ret | content ) + Suppress(closer) )
+else:
+ret << Group( Suppress(opener) + ZeroOrMore( ret | content )  + Suppress(closer) )
+return ret
+def indentedBlock(blockStatementExpr, indentStack, indent=True):
+"""Helper method for defining space-delimited indentation blocks, such as
+those used to define block statements in Python source code.
+Parameters:
+- blockStatementExpr - expression defining syntax of statement that
+is repeated within the indented block
+- indentStack - list created by caller to manage indentation stack
+(multiple statementWithIndentedBlock expressions within a single grammar
+should share a common indentStack)
+- indent - boolean indicating whether block must be indented beyond the
+the current level; set to False for block of left-most statements
+(default=True)
+A valid block must contain at least one C{blockStatement}.
+"""
+def checkPeerIndent(s,l,t):
+if l >= len(s): return
+curCol = col(l,s)
+if curCol != indentStack[-1]:
+if curCol > indentStack[-1]:
+raise ParseFatalException(s,l,"illegal nesting")
+raise ParseException(s,l,"not a peer entry")
+def checkSubIndent(s,l,t):
+curCol = col(l,s)
+if curCol > indentStack[-1]:
+indentStack.append( curCol )
+else:
+raise ParseException(s,l,"not a subentry")
+def checkUnindent(s,l,t):
+if l >= len(s): return
+curCol = col(l,s)
+if not(indentStack and curCol < indentStack[-1] and curCol <= indentStack[-2]):
+raise ParseException(s,l,"not an unindent")
+indentStack.pop()
+NL = OneOrMore(LineEnd().setWhitespaceChars("\t ").suppress())
+INDENT = Empty() + Empty().setParseAction(checkSubIndent)
+PEER   = Empty().setParseAction(checkPeerIndent)
+UNDENT = Empty().setParseAction(checkUnindent)
+if indent:
+smExpr = Group( Optional(NL) +
+#~ FollowedBy(blockStatementExpr) +
+INDENT + (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) + UNDENT)
+else:
+smExpr = Group( Optional(NL) +
+(OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) )
+blockStatementExpr.ignore(_bslash + LineEnd())
+return smExpr
+alphas8bit = srange(r"[\0xc0-\0xd6\0xd8-\0xf6\0xf8-\0xff]")
+punc8bit = srange(r"[\0xa1-\0xbf\0xd7\0xf7]")
+anyOpenTag,anyCloseTag = makeHTMLTags(Word(alphas,alphanums+"_:"))
+commonHTMLEntity = Combine(_L("&") + oneOf("gt lt amp nbsp quot").setResultsName("entity") +";").streamline()
+_htmlEntityMap = dict(zip("gt lt amp nbsp quot".split(),'><& "'))
+replaceHTMLEntity = lambda t : t.entity in _htmlEntityMap and _htmlEntityMap[t.entity] or None
+# it's easy to get these comment structures wrong - they're very common, so may as well make them available
+cStyleComment = Regex(r"/\*(?:[^*]*\*+)+?/").setName("C style comment")
+htmlComment = Regex(r"<!--[\s\S]*?-->")
+restOfLine = Regex(r".*").leaveWhitespace()
+dblSlashComment = Regex(r"\/\/(\\\n|.)*").setName("// comment")
+cppStyleComment = Regex(r"/(?:\*(?:[^*]*\*+)+?/|/[^\n]*(?:\n[^\n]*)*?(?:(?<!\\)|\Z))").setName("C++ style comment")
+javaStyleComment = cppStyleComment
+pythonStyleComment = Regex(r"#.*").setName("Python style comment")
+_noncomma = "".join( [ c for c in printables if c != "," ] )
+_commasepitem = Combine(OneOrMore(Word(_noncomma) +
+Optional( Word(" \t") +
+~Literal(",") + ~LineEnd() ) ) ).streamline().setName("commaItem")
+commaSeparatedList = delimitedList( Optional( quotedString.copy() | _commasepitem, default="") ).setName("commaSeparatedList")
+if __name__ == "__main__":
+def test( teststring ):
+try:
+tokens = simpleSQL.parseString( teststring )
+tokenlist = tokens.asList()
+print (teststring + "->"   + str(tokenlist))
+print ("tokens = "         + str(tokens))
+print ("tokens.columns = " + str(tokens.columns))
+print ("tokens.tables = "  + str(tokens.tables))
+print (tokens.asXML("SQL",True))
+except ParseBaseException:
+err = sys.exc_info()[1]
+print (teststring + "->")
+print (err.line)
+print (" "*(err.column-1) + "^")
+print (err)
+print()
+selectToken    = CaselessLiteral( "select" )
+fromToken      = CaselessLiteral( "from" )
+ident          = Word( alphas, alphanums + "_$" )
+columnName     = delimitedList( ident, ".", combine=True ).setParseAction( upcaseTokens )
+columnNameList = Group( delimitedList( columnName ) )#.setName("columns")
+tableName      = delimitedList( ident, ".", combine=True ).setParseAction( upcaseTokens )
+tableNameList  = Group( delimitedList( tableName ) )#.setName("tables")
+simpleSQL      = ( selectToken + \
+( '*' | columnNameList ).setResultsName( "columns" ) + \
+fromToken + \
+tableNameList.setResultsName( "tables" ) )
+test( "SELECT * from XYZZY, ABC" )
+test( "select * from SYS.XYZZY" )
+test( "Select A from Sys.dual" )
+test( "Select AA,BB,CC from Sys.dual" )
+test( "Select A, B, C from Sys.dual" )
+test( "Select A, B, C from Sys.dual" )
+test( "Xelect A, B, C from Sys.dual" )
+test( "Select A, B, C frox Sys.dual" )
+test( "Select" )
+test( "Select ^^^ frox Sys.dual" )
+test( "Select A, B, C from Sys.dual, Table2   " )

Mercurial > dottes

comparison abc2xml/pyparsing.py @ 484:4fab69a1027d build-default-207