--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sbsv2/raptor/python/pyparsing.py Tue Oct 27 16:36:35 2009 +0000
@@ -0,0 +1,2961 @@
+# module pyparsing.py
+#
+# Copyright (c) 2003-2006 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 "<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 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__ = "1.4.5"
+__versionTime__ = "16 December 2006 07:20"
+__author__ = "Paul McGuire <ptmcg@users.sourceforge.net>"
+
+import string
+import copy,sys
+import warnings
+import re
+import sre_constants
+import xml.sax.saxutils
+#~ sys.stderr.write( "testing pyparsing module, version %s, %s\n" % (__version__,__versionTime__ ) )
+
+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 | ... >.
+ """
+ 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, e:
+ # 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')
+ # ...
+
+def _str2dict(strg):
+ return dict( [(c,0) for c in strg] )
+ #~ return set( [c for c in strg] )
+
+class _Constants(object):
+ pass
+
+alphas = string.lowercase + string.uppercase
+nums = string.digits
+hexnums = nums + "ABCDEFabcdef"
+alphanums = alphas + nums
+
+class ParseBaseException(Exception):
+ """base exception class for all parsing runtime exceptions"""
+ __slots__ = ( "loc","msg","pstr","parserElement" )
+ # Performance tuning: we construct a *lot* of these, so keep this
+ # constructor as small and fast as possible
+ def __init__( self, pstr, loc, msg, elem=None ):
+ self.loc = loc
+ 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()
+
+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 ReparseException(ParseBaseException):
+ def __init_( self, newstring, restartLoc ):
+ self.newParseText = newstring
+ self.reparseLoc = restartLoc
+
+
+class RecursiveGrammarException(Exception):
+ """exception thrown by validate() if the grammar could be improperly recursive"""
+ def __init__( self, parseElementList ):
+ self.parseElementTrace = parseElementList
+
+ def __str__( self ):
+ return "RecursiveGrammarException: %s" % self.parseElementTrace
+
+class ParseResults(object):
+ """Structured parse results, to provide multiple means of access to the parsed data:
+ - as a list (len(results))
+ - by list index (results[0], results[1], etc.)
+ - by attribute (results.<resultsName>)
+ """
+ __slots__ = ( "__toklist", "__tokdict", "__doinit", "__name", "__parent", "__accumNames" )
+ 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 ):
+ 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()
+
+ # this line is related to debugging the asXML bug
+ #~ asList = False
+
+ if 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] = (toklist.copy(),-1)
+ else:
+ self[name] = (ParseResults(toklist[0]),-1)
+ self[name].__name = name
+ else:
+ try:
+ self[name] = toklist[0]
+ except (KeyError,TypeError):
+ 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 ):
+ if isinstance(v,tuple):
+ 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()) + [(v,0)]
+ sub = v
+ if isinstance(sub,ParseResults):
+ sub.__parent = self
+
+ def __delitem__( self, i ):
+ if isinstance(i,(int,slice)):
+ del self.__toklist[i]
+ else:
+ del self._tokdict[i]
+
+ def __contains__( self, k ):
+ return self.__tokdict.has_key(k)
+
+ def __len__( self ): return len( self.__toklist )
+ def __nonzero__( self ): return len( self.__toklist ) > 0
+ def __iter__( self ): return iter( self.__toklist )
+ def keys( self ):
+ """Returns all named result keys."""
+ return self.__tokdict.keys()
+
+ def items( self ):
+ """Returns all named result keys and values as a list of tuples."""
+ return [(k,self[k]) for k in self.__tokdict.keys()]
+
+ def values( self ):
+ """Returns all named result values."""
+ return [ v[-1][0] for v in self.__tokdict.values() ]
+
+ def __getattr__( self, name ):
+ if name not in self.__slots__:
+ if self.__tokdict.has_key( name ):
+ 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,(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 = self
+ self.__toklist += other.__toklist
+ self.__accumNames.update( other.__accumNames )
+ del other
+ return self
+
+ 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 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.sax.saxutils.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 ParseResults.
+ Accepts an optional indent argument so that this string can be embedded
+ in a nested display of other data."""
+ out = []
+ out.append( indent+str(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('\n')
+ out.append( v.dump(indent,depth+1) )
+ #~ out.append('\n')
+ else:
+ out.append(str(v))
+ else:
+ out.append(str(v))
+ #~ out.append('\n')
+ return "".join(out)
+
+ # add support for pickle protocol
+ def __getstate__(self):
+ return ( self.__toklist,
+ ( self.__tokdict.copy(),
+ self.__parent,
+ self.__accumNames,
+ self.__name ) )
+
+ def __setstate__(self,state):
+ self.__toklist = state[0]
+ self.__tokdict, \
+ self.__parent, \
+ inAccumNames, \
+ self.__name = state[1]
+ self.__accumNames = {}
+ self.__accumNames.update(inAccumNames)
+
+
+def col (loc,strg):
+ """Returns current column within a string, counting newlines as line separators.
+ The first column is number 1.
+ """
+ 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.
+ """
+ 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",expr,"at loc",loc,"(%d,%d)" % ( lineno(loc,instring), col(loc,instring) )
+
+def _defaultSuccessDebugAction( instring, startloc, endloc, expr, toks ):
+ print "Matched",expr,"->",toks.asList()
+
+def _defaultExceptionDebugAction( instring, loc, expr, exc ):
+ print "Exception raised:", exc
+
+def nullDebugAction(*args):
+ """'Do-nothing' debug action, to suppress debugging output during parsing."""
+ pass
+
+class ParserElement(object):
+ """Abstract base level parser element class."""
+ DEFAULT_WHITE_CHARS = " \n\t\r"
+
+ 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
+ self.keepTabs = False
+ self.ignoreExprs = list()
+ self.debug = False
+ self.streamlined = False
+ self.mayIndexError = True
+ self.errmsg = ""
+ self.modalResults = True
+ self.debugActions = ( None, None, None )
+ self.re = None
+
+ def copy( self ):
+ """Make a copy of this 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
+ 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 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.
+ """
+ newself = self.copy()
+ newself.resultsName = name
+ newself.modalResults = not listAllMatches
+ return newself
+
+ def normalizeParseActionArgs( f ):
+ """Internal method used to decorate parse actions that take fewer than 3 arguments,
+ so that all parse actions can be called as f(s,l,t)."""
+ STAR_ARGS = 4
+
+ try:
+ restore = None
+ if isinstance(f,type):
+ restore = f
+ f = f.__init__
+ if f.func_code.co_flags & STAR_ARGS:
+ return f
+ numargs = f.func_code.co_argcount
+ if hasattr(f,"im_self"):
+ numargs -= 1
+ if restore:
+ f = restore
+ except AttributeError:
+ try:
+ # not a function, must be a callable object, get info from the
+ # im_func binding of its bound __call__ method
+ if f.__call__.im_func.func_code.co_flags & STAR_ARGS:
+ return f
+ numargs = f.__call__.im_func.func_code.co_argcount
+ if hasattr(f.__call__,"im_self"):
+ numargs -= 1
+ except AttributeError:
+ # not a bound method, get info directly from __call__ method
+ if f.__call__.func_code.co_flags & STAR_ARGS:
+ return f
+ numargs = f.__call__.func_code.co_argcount
+ if hasattr(f.__call__,"im_self"):
+ numargs -= 1
+
+ #~ print "adding function %s with %d args" % (f.func_name,numargs)
+ if numargs == 3:
+ return f
+ else:
+ if numargs == 2:
+ def tmp(s,l,t):
+ return f(l,t)
+ elif numargs == 1:
+ def tmp(s,l,t):
+ return f(t)
+ else: #~ numargs == 0:
+ def tmp(s,l,t):
+ return f()
+ return tmp
+ normalizeParseActionArgs = staticmethod(normalizeParseActionArgs)
+
+ def setParseAction( self, *fns ):
+ """Define action to perform when successfully matching parse element definition.
+ Parse action fn is a callable method with 0-3 arguments, called as fn(s,loc,toks),
+ fn(loc,toks), fn(toks), or just fn(), where:
+ - s = the original string being parsed
+ - 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."""
+ self.parseAction = map(self.normalizeParseActionArgs, list(fns))
+ return self
+
+ def addParseAction( self, *fns ):
+ """Add parse action to expression's list of parse actions. See setParseAction_."""
+ self.parseAction += map(self.normalizeParseActionArgs, list(fns))
+ 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
+ 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 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:
+ preloc = self.preParse( instring, loc )
+ else:
+ preloc = loc
+ tokensStart = loc
+ try:
+ try:
+ loc,tokens = self.parseImpl( instring, preloc, doActions )
+ except IndexError:
+ raise ParseException( instring, len(instring), self.errmsg, self )
+ #~ except ReparseException, retryEx:
+ #~ pass
+ except ParseException, err:
+ #~ print "Exception raised:", err
+ if self.debugActions[2]:
+ self.debugActions[2]( instring, tokensStart, self, err )
+ if self.failAction:
+ self.failAction( instring, tokensStart, self, err )
+ raise
+ else:
+ if callPreParse:
+ preloc = self.preParse( instring, loc )
+ else:
+ preloc = loc
+ tokensStart = loc
+ 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:
+ 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 ParseException, err:
+ #~ print "Exception raised in user parse action:", err
+ if (self.debugActions[2] ):
+ 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 ):
+ return self._parse( instring, loc, doActions=False )[0]
+
+ # 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 ):
+ if doActions and self.parseAction:
+ return self._parseNoCache( instring, loc, doActions, callPreParse )
+ lookup = (self,instring,loc,callPreParse)
+ if lookup in ParserElement._exprArgCache:
+ value = ParserElement._exprArgCache[ lookup ]
+ if isinstance(value,Exception):
+ if isinstance(value,ParseBaseException):
+ value.loc = loc
+ raise value
+ return value
+ else:
+ try:
+ ParserElement._exprArgCache[ lookup ] = \
+ value = self._parseNoCache( instring, loc, doActions, callPreParse )
+ return value
+ except ParseBaseException, pe:
+ 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 ParserElement.enablePackrat(). If
+ your program uses psyco to "compile as you go", you must call
+ enablePackrat before calling psyco.full(). If you do not do this,
+ Python will crash. For best results, call enablePackrat() immediately
+ after importing pyparsing.
+ """
+ if not ParserElement._packratEnabled:
+ ParserElement._packratEnabled = True
+ ParserElement._parse = ParserElement._parseCache
+ enablePackrat = staticmethod(enablePackrat)
+
+ def parseString( self, instring ):
+ """Execute the parse expression with the given string.
+ This is the main interface to the client code, once the complete
+ expression has been built.
+ """
+ ParserElement.resetCache()
+ if not self.streamlined:
+ self.streamline()
+ #~ self.saveAsList = True
+ for e in self.ignoreExprs:
+ e.streamline()
+ if self.keepTabs:
+ loc, tokens = self._parse( instring, 0 )
+ else:
+ loc, tokens = self._parse( instring.expandtabs(), 0 )
+ return tokens
+
+ def scanString( self, instring, maxMatches=sys.maxint ):
+ """Scan the input string for expression matches. Each match will return the
+ matching tokens, start location, and end location. May be called with optional
+ maxMatches argument, to clip scanning after 'n' matches are found."""
+ if not self.streamlined:
+ self.streamline()
+ for e in self.ignoreExprs:
+ e.streamline()
+
+ if not self.keepTabs:
+ instring = instring.expandtabs()
+ instrlen = len(instring)
+ loc = 0
+ preparseFn = self.preParse
+ parseFn = self._parse
+ ParserElement.resetCache()
+ matches = 0
+ while loc <= instrlen and matches < maxMatches:
+ try:
+ preloc = preparseFn( instring, loc )
+ nextLoc,tokens = parseFn( instring, preloc, callPreParse=False )
+ except ParseException:
+ loc = preloc+1
+ else:
+ matches += 1
+ yield tokens, preloc, nextLoc
+ loc = nextLoc
+
+ def transformString( self, instring ):
+ """Extension to scanString, to modify matching text with modified tokens that may
+ be returned from a parse action. To use transformString, define a grammar and
+ attach a parse action to it that modifies the returned token list.
+ Invoking transformString() on a target string will then scan for matches,
+ and replace the matched text patterns according to the logic in the parse
+ action. 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
+ 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:])
+ return "".join(out)
+
+ def searchString( self, instring, maxMatches=sys.maxint ):
+ """Another extension to scanString, simplifying the access to the tokens found
+ to match the given parse expression. May be called with optional
+ maxMatches argument, to clip searching after 'n' matches are found.
+ """
+ return ParseResults([ t for t,s,e in self.scanString( instring, maxMatches ) ])
+
+ def __add__(self, other ):
+ """Implementation of + operator - returns And"""
+ if isinstance( other, basestring ):
+ other = Literal( other )
+ if not isinstance( other, ParserElement ):
+ warnings.warn("Cannot add element of type %s to ParserElement" % type(other),
+ SyntaxWarning, stacklevel=2)
+ return And( [ self, other ] )
+
+ def __radd__(self, other ):
+ """Implementation of += operator"""
+ if isinstance( other, basestring ):
+ other = Literal( other )
+ if not isinstance( other, ParserElement ):
+ warnings.warn("Cannot add element of type %s to ParserElement" % type(other),
+ SyntaxWarning, stacklevel=2)
+ return other + self
+
+ def __or__(self, other ):
+ """Implementation of | operator - returns MatchFirst"""
+ if isinstance( other, basestring ):
+ other = Literal( other )
+ if not isinstance( other, ParserElement ):
+ warnings.warn("Cannot add element of type %s to ParserElement" % type(other),
+ SyntaxWarning, stacklevel=2)
+ return MatchFirst( [ self, other ] )
+
+ def __ror__(self, other ):
+ """Implementation of |= operator"""
+ if isinstance( other, basestring ):
+ other = Literal( other )
+ if not isinstance( other, ParserElement ):
+ warnings.warn("Cannot add element of type %s to ParserElement" % type(other),
+ SyntaxWarning, stacklevel=2)
+ return other | self
+
+ def __xor__(self, other ):
+ """Implementation of ^ operator - returns Or"""
+ if isinstance( other, basestring ):
+ other = Literal( other )
+ if not isinstance( other, ParserElement ):
+ warnings.warn("Cannot add element of type %s to ParserElement" % type(other),
+ SyntaxWarning, stacklevel=2)
+ return Or( [ self, other ] )
+
+ def __rxor__(self, other ):
+ """Implementation of ^= operator"""
+ if isinstance( other, basestring ):
+ other = Literal( other )
+ if not isinstance( other, ParserElement ):
+ warnings.warn("Cannot add element of type %s to ParserElement" % type(other),
+ SyntaxWarning, stacklevel=2)
+ return other ^ self
+
+ def __and__(self, other ):
+ """Implementation of & operator - returns Each"""
+ if isinstance( other, basestring ):
+ other = Literal( other )
+ if not isinstance( other, ParserElement ):
+ warnings.warn("Cannot add element of type %s to ParserElement" % type(other),
+ SyntaxWarning, stacklevel=2)
+ return Each( [ self, other ] )
+
+ def __rand__(self, other ):
+ """Implementation of right-& operator"""
+ if isinstance( other, basestring ):
+ other = Literal( other )
+ if not isinstance( other, ParserElement ):
+ warnings.warn("Cannot add element of type %s to ParserElement" % type(other),
+ SyntaxWarning, stacklevel=2)
+ return other & self
+
+ def __invert__( self ):
+ """Implementation of ~ operator - returns NotAny"""
+ return NotAny( self )
+
+ def suppress( self ):
+ """Suppresses the output of this 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
+ 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 <TAB>s to spaces before parsing the input string.
+ Must be called before parseString when the input grammar contains elements that
+ match <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 )
+ else:
+ self.ignoreExprs.append( Suppress( other ) )
+ 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."""
+ 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 ):
+ """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()
+ return self.parseString(file_contents)
+
+
+class Token(ParserElement):
+ """Abstract ParserElement subclass, for defining atomic matching patterns."""
+ def __init__( self ):
+ super(Token,self).__init__( savelist=False )
+ self.myException = ParseException("",0,"",self)
+
+ def setName(self, name):
+ s = super(Token,self).setName(name)
+ self.errmsg = "Expected " + self.name
+ s.myException.msg = self.errmsg
+ 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"
+ self.myException.msg = self.errmsg
+
+ 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"' % self.match
+ self.errmsg = "Expected " + self.name
+ self.mayReturnEmpty = False
+ self.myException.msg = self.errmsg
+ 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
+
+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 Literal::
+ Literal("if") will match the leading 'if' in 'ifAndOnlyIf'.
+ Keyword("if") will not; it will only match the leading 'if in 'if x=1', or 'if(y==2)'
+ Accepts two optional constructor arguments in addition to the keyword string:
+ identChars is a string of characters that would be valid identifier characters,
+ defaulting to all alphanumerics + "_" and "$"; caseless allows case-insensitive
+ matching, default is False.
+ """
+ DEFAULT_KEYWORD_CHARS = alphanums+"_$"
+
+ 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.myException.msg = self.errmsg
+ self.mayIndexError = False
+ self.caseless = caseless
+ if caseless:
+ self.caselessmatch = matchString.upper()
+ identChars = identChars.upper()
+ self.identChars = _str2dict(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
+ self.myException.msg = self.errmsg
+
+ 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.
+ """
+ def __init__( self, initChars, bodyChars=None, min=1, max=0, exact=0 ):
+ super(Word,self).__init__()
+ self.initCharsOrig = initChars
+ self.initChars = _str2dict(initChars)
+ if bodyChars :
+ self.bodyCharsOrig = bodyChars
+ self.bodyChars = _str2dict(bodyChars)
+ else:
+ self.bodyCharsOrig = initChars
+ self.bodyChars = _str2dict(initChars)
+
+ self.maxSpecified = max > 0
+
+ self.minLen = min
+
+ if max > 0:
+ self.maxLen = max
+ else:
+ self.maxLen = sys.maxint
+
+ if exact > 0:
+ self.maxLen = exact
+ self.minLen = exact
+
+ self.name = _ustr(self)
+ self.errmsg = "Expected " + self.name
+ self.myException.msg = self.errmsg
+ self.mayIndexError = False
+
+ 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),)
+ 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 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.
+ """
+ def __init__( self, pattern, flags=0):
+ """The parameters pattern and flags are passed to the re.compile() function as-is. See the Python re module for an explanation of the acceptable patterns and flags."""
+ super(Regex,self).__init__()
+
+ 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,e:
+ warnings.warn("invalid pattern (%s) passed to Regex" % pattern,
+ SyntaxWarning, stacklevel=2)
+ raise
+
+ self.name = _ustr(self)
+ self.errmsg = "Expected " + self.name
+ self.myException.msg = self.errmsg
+ 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.keys():
+ 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))
+ self.escCharReplacePattern = re.escape(self.escChar)+"(.)"
+ 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,e:
+ warnings.warn("invalid pattern (%s) passed to Regex" % self.pattern,
+ SyntaxWarning, stacklevel=2)
+ raise
+
+ self.name = _ustr(self)
+ self.errmsg = "Expected " + self.name
+ self.myException.msg = self.errmsg
+ 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.
+ """
+ def __init__( self, notChars, min=1, max=0, exact=0 ):
+ super(CharsNotIn,self).__init__()
+ self.skipWhitespace = False
+ self.notChars = notChars
+
+ self.minLen = min
+
+ if max > 0:
+ self.maxLen = max
+ else:
+ self.maxLen = sys.maxint
+
+ if exact > 0:
+ self.maxLen = exact
+ self.minLen = exact
+
+ self.name = _ustr(self)
+ self.errmsg = "Expected " + self.name
+ self.mayReturnEmpty = ( self.minLen == 0 )
+ self.myException.msg = self.errmsg
+ 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 " \\t\\n". Also takes optional min, max, and exact arguments,
+ as defined for the 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.myException.msg = self.errmsg
+
+ self.minLen = min
+
+ if max > 0:
+ self.maxLen = max
+ else:
+ self.maxLen = sys.maxint
+
+ 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( " \t" )
+ self.errmsg = "Expected start of line"
+ self.myException.msg = self.errmsg
+
+ 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( " \t" )
+ self.errmsg = "Expected end of line"
+ self.myException.msg = self.errmsg
+
+ 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"
+ self.myException.msg = self.errmsg
+
+ 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"
+ self.myException.msg = self.errmsg
+
+ 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, []
+ else:
+ exc = self.myException
+ exc.loc = loc
+ exc.pstr = instring
+ raise exc
+
+
+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:
+ self.exprs = [ exprs ]
+
+ 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 leaveWhitespace defined in base class, and also invokes 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( [] )
+
+class And(ParseExpression):
+ """Requires all given ParseExpressions to be found in the given order.
+ Expressions may be separated by whitespace.
+ May be constructed using the '+' operator.
+ """
+ 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
+
+ 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 )
+ for e in self.exprs[1:]:
+ 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 ParseExpression is found.
+ If two expressions match, the expression that matches the longest string will be used.
+ May be constructed using the '^' 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
+ for e in self.exprs:
+ try:
+ loc2 = e.tryParse( instring, loc )
+ except ParseException, err:
+ if err.loc > maxExcLoc:
+ maxException = err
+ maxExcLoc = err.loc
+ except IndexError, err:
+ 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 self.exprs:
+ 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 ParseExpression is found.
+ If two expressions match, the first one listed is the one that will match.
+ May be constructed using the '|' 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
+ 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, err:
+ 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 self.exprs:
+ 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 ParseExpressions to be found, but in any order.
+ Expressions may be separated by whitespace.
+ May be constructed using the '&' 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.optionals = [ e.expr for e in exprs if isinstance(e,Optional) ]
+ self.multioptionals = [ e.expr for e in exprs if isinstance(e,ZeroOrMore) ]
+ self.multirequired = [ e.expr for e in exprs if isinstance(e,OneOrMore) ]
+ self.required = [ e for e in exprs if not isinstance(e,(Optional,ZeroOrMore,OneOrMore)) ]
+ self.required += self.multirequired
+
+ def parseImpl( self, instring, loc, doActions=True ):
+ 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 )
+
+ 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 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.setWhitespaceChars( expr.whiteChars )
+ self.skipWhitespace = expr.skipWhitespace
+ self.saveAsList = expr.saveAsList
+
+ 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. FollowedBy
+ does *not* advance the parsing position within the input string, it only
+ verifies that the specified parse expression matches at the current
+ position. 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. 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, NotAny does *not* skip over leading whitespace. 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)
+ self.myException = ParseException("",0,self.errmsg,self)
+
+ 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
+ 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:
+ 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 include is set to true, the matched expression is also consumed. The 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 ):
+ super( SkipTo, self ).__init__( other )
+ if ignore is not None:
+ self.expr = self.expr.copy()
+ self.expr.ignore(ignore)
+ self.mayReturnEmpty = True
+ self.mayIndexError = False
+ self.includeMatch = include
+ self.asList = False
+ self.errmsg = "No match found for "+_ustr(self.expr)
+ self.myException = ParseException("",0,self.errmsg,self)
+
+ def parseImpl( self, instring, loc, doActions=True ):
+ startLoc = loc
+ instrlen = len(instring)
+ expr = self.expr
+ while loc <= instrlen:
+ try:
+ loc = expr.skipIgnorables( instring, loc )
+ expr._parse( instring, loc, doActions=False, callPreParse=False )
+ if self.includeMatch:
+ skipText = instring[startLoc:loc]
+ loc,mat = expr._parse(instring,loc)
+ if mat:
+ return loc, [ skipText, mat ]
+ else:
+ return loc, [ skipText ]
+ else:
+ return loc, [ instring[startLoc:loc] ]
+ except (ParseException,IndexError):
+ 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 Forward variable using the '<<' operator.
+
+ Note: take care when assigning to 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 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
+ return self
+
+ 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.__class__ = _ForwardNoRecurse
+ try:
+ if self.expr is not None:
+ retString = _ustr(self.expr)
+ else:
+ retString = "None"
+ finally:
+ self.__class__ = Forward
+ return "Forward: "+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 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 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 '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
+
+ 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 ZeroOrMore and 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):
+ ikey = _ustr(tok[0]).strip()
+ if len(tok)==1:
+ tokenlist[ikey] = ("",i)
+ elif len(tok)==2 and not isinstance(tok[1],ParseResults):
+ tokenlist[ikey] = (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] = (dictvalue,i)
+ else:
+ tokenlist[ikey] = (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 = ParserElement.normalizeParseActionArgs(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.called = False
+
+def traceParseAction(f):
+ """Decorator for debugging parse actions."""
+ f = ParserElement.normalizeParseActionArgs(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.stderr.write( "<<leaving %s (exception: %s)\n" % (thisFunc,exc) )
+ raise
+ sys.stderr.write( "<<leaving %s (ret: %s)\n" % (thisFunc,ret) )
+ return ret
+ 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 'combine=True' in the constructor.
+ If 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 ):
+ """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 = int(t[0])
+ arrayExpr << (n and Group(And([expr]*n)) or Group(empty))
+ return []
+ return ( Word(nums).setParseAction(countFieldParseAction) + arrayExpr )
+
+def _flatten(L):
+ if type(L) is not list: return [L]
+ if L == []: return L
+ return _flatten(L[0]) + _flatten(L[1:])
+
+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 "1:1", but not "1:2". Because this matches a
+ previous literal, will also match the leading "1:1" in "1:10".
+ If this is not desired, use 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)
+ 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 "1:1", but not "1:2". Because this matches by
+ expressions, will *not* match the leading "1:1" in "1:10";
+ the expressions are evaluated first, and then compared, so
+ "1" is compared with "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 )
+ expr.addParseAction(copyTokenToRepeater)
+ return rep
+
+def _escapeRegexRangeChars(s):
+ #~ escape these chars: ^-]
+ for c in r"\^-]":
+ s = s.replace(c,"\\"+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 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 MatchFirst object (if caseless=True, or
+ if creating a 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 = 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 Dict, ZeroOrMore, and 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 Dict results can include named token
+ fields.
+ """
+ return Dict( ZeroOrMore( Group ( key + value ) ) )
+
+_bslash = "\\"
+printables = "".join( [ c for c in string.printable if c not in string.whitespace ] )
+
+# 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 = Combine( Suppress(_bslash + "0x") + Word(hexnums) ).setParseAction(lambda s,l,t:unichr(int(t[0],16)))
+_escapedOctChar = Combine( Suppress(_bslash) + Word("0","01234567") ).setParseAction(lambda s,l,t:unichr(int(t[0],8)))
+_singleChar = _escapedPunc | _escapedHexChar | _escapedOctChar | Word(_printables_less_backslash,exact=1)
+_charRange = Group(_singleChar + Suppress("-") + _singleChar)
+_reBracketExpr = "[" + 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 '\0x' (\0x21, which is a '!' character)
+ 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 replaceWith(replStr):
+ """Helper method for common parse actions that simply return a literal value. Especially
+ useful when used with 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 [ str(tt).upper() for tt in t ]
+
+def downcaseTokens(s,l,t):
+ """Helper parse action to convert tokens to lower case."""
+ return [ str(tt).lower() for tt in t ]
+
+def keepOriginalText(s,startLoc,t):
+ import inspect
+ """Helper parse action to preserve original parsed text,
+ overriding any nested parse actions."""
+ f = inspect.stack()[1][0]
+ try:
+ endloc = f.f_locals["loc"]
+ finally:
+ del f
+ return s[startLoc:endloc]
+
+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 + \
+ 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 + \
+ Dict(ZeroOrMore(Group( tagAttrName.setParseAction(downcaseTokens) + \
+ Suppress("=") + tagAttrValue ))) + \
+ Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">")
+ closeTag = Combine("</" + 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)
+
+ 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 )
+
+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
+ - numTerms is the number of terms for this operator (must
+ be 1 or 2)
+ - 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]
+ thisExpr = Forward().setName("expr%d" % i)
+ if rightLeftAssoc == opAssoc.LEFT:
+ if arity == 1:
+ matchExpr = Group( lastExpr + opExpr )
+ elif arity == 2:
+ matchExpr = Group( lastExpr + OneOrMore( opExpr + lastExpr ) )
+ else:
+ raise ValueError, "operator must be unary (1) or binary (2)"
+ 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:
+ matchExpr = Group( lastExpr + OneOrMore( opExpr + thisExpr ) )
+ else:
+ raise ValueError, "operator must be unary (1) or binary (2)"
+ else:
+ raise ValueError, "operator must indicate right or left associativity"
+ if pa:
+ matchExpr.setParseAction( pa )
+ thisExpr << ( matchExpr | lastExpr )
+ lastExpr = thisExpr
+ ret << lastExpr
+ return ret
+
+alphas8bit = srange(r"[\0xc0-\0xd6\0xd8-\0xf6\0xf8-\0xff]")
+punc8bit = srange(r"[\0xa1-\0xbf\0xd7\0xf7]")
+
+dblQuotedString = Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\.))*"').setName("string enclosed in double quotes")
+sglQuotedString = Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\.))*'").setName("string enclosed in single quotes")
+quotedString = Regex(r'''(?:"(?:[^"\n\r\\]|(?:"")|(?:\\.))*")|(?:'(?:[^'\n\r\\]|(?:'')|(?:\\.))*')''').setName("quotedString using single or double quotes")
+
+anyOpenTag,anyCloseTag = makeHTMLTags(Word(alphas,alphanums+"_"))
+commonHTMLEntity = Combine("&" + oneOf("gt lt amp nbsp quot").setResultsName("entity") +";")
+_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 | _commasepitem, default="") ).setName("commaSeparatedList")
+
+
+if __name__ == "__main__":
+
+ def test( teststring ):
+ print teststring,"->",
+ try:
+ tokens = simpleSQL.parseString( teststring )
+ tokenlist = tokens.asList()
+ print tokenlist
+ print "tokens = ", tokens
+ print "tokens.columns =", tokens.columns
+ print "tokens.tables =", tokens.tables
+ print tokens.asXML("SQL",True)
+ except ParseException, err:
+ 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 " )