# module pyparsing.py # # Copyright (c) 2003-2015 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. # __doc__ = \ """ pyparsing module - Classes and methods to define and execute parsing grammars The pyparsing module is an alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions. With pyparsing, you don't need to learn a new syntax for defining grammars or matching expressions - the parsing module provides a library of classes that you use to construct the grammar directly in Python. Here is a program to parse "Hello, World!" (or any greeting of the form C{", !"}):: from pyparsing import Word, alphas # define grammar of a greeting greet = Word( alphas ) + "," + Word( alphas ) + "!" hello = "Hello, World!" print (hello, "->", greet.parseString( hello )) The program outputs the following:: Hello, World! -> ['Hello', ',', 'World', '!'] The Python representation of the grammar is quite readable, owing to the self-explanatory class names, and the use of '+', '|' and '^' operators. The parsed results returned from C{parseString()} can be accessed as a nested list, a dictionary, or an object with named attributes. The pyparsing module handles some of the problems that are typically vexing when writing text parsers: - extra or missing whitespace (the above program will also handle "Hello,World!", "Hello , World !", etc.) - quoted strings - embedded comments """ __version__ = "2.1.5" __versionTime__ = "13 Jun 2016 19:59 UTC" __author__ = "Paul McGuire " import string from weakref import ref as wkref import copy import sys import warnings import re import sre_constants import collections import pprint import traceback from datetime import datetime #~ sys.stderr.write( "testing pyparsing module, version %s, %s\n" % (__version__,__versionTime__ ) ) __all__ = [ 'And', 'CaselessKeyword', 'CaselessLiteral', 'CharsNotIn', 'Combine', 'Dict', 'Each', 'Empty', 'FollowedBy', 'Forward', 'GoToColumn', 'Group', 'Keyword', 'LineEnd', 'LineStart', 'Literal', 'MatchFirst', 'NoMatch', 'NotAny', 'OneOrMore', 'OnlyOnce', 'Optional', 'Or', 'ParseBaseException', 'ParseElementEnhance', 'ParseException', 'ParseExpression', 'ParseFatalException', 'ParseResults', 'ParseSyntaxException', 'ParserElement', 'QuotedString', 'RecursiveGrammarException', 'Regex', 'SkipTo', 'StringEnd', 'StringStart', 'Suppress', 'Token', 'TokenConverter', 'White', 'Word', 'WordEnd', 'WordStart', 'ZeroOrMore', 'alphanums', 'alphas', 'alphas8bit', 'anyCloseTag', 'anyOpenTag', 'cStyleComment', 'col', 'commaSeparatedList', 'commonHTMLEntity', 'countedArray', 'cppStyleComment', 'dblQuotedString', 'dblSlashComment', 'delimitedList', 'dictOf', 'downcaseTokens', 'empty', 'hexnums', 'htmlComment', 'javaStyleComment', 'line', 'lineEnd', 'lineStart', 'lineno', 'makeHTMLTags', 'makeXMLTags', 'matchOnlyAtCol', 'matchPreviousExpr', 'matchPreviousLiteral', 'nestedExpr', 'nullDebugAction', 'nums', 'oneOf', 'opAssoc', 'operatorPrecedence', 'printables', 'punc8bit', 'pythonStyleComment', 'quotedString', 'removeQuotes', 'replaceHTMLEntity', 'replaceWith', 'restOfLine', 'sglQuotedString', 'srange', 'stringEnd', 'stringStart', 'traceParseAction', 'unicodeString', 'upcaseTokens', 'withAttribute', 'indentedBlock', 'originalTextFor', 'ungroup', 'infixNotation','locatedExpr', 'withClass', 'tokenMap', 'pyparsing_common', ] system_version = tuple(sys.version_info)[:3] PY_3 = system_version[0] == 3 if PY_3: _MAX_INT = sys.maxsize basestring = str unichr = chr _ustr = str # build list of single arg builtins, that can be used as parse actions singleArgBuiltins = [sum, len, sorted, reversed, list, tuple, set, any, all, min, max] else: _MAX_INT = sys.maxint range = xrange def _ustr(obj): """Drop-in replacement for str(obj) that tries to be Unicode friendly. It first tries str(obj). If that fails with a UnicodeEncodeError, then it tries unicode(obj). It then < returns the unicode object | encodes it with the default encoding | ... >. """ if isinstance(obj,unicode): return obj try: # If this works, then _ustr(obj) has the same behaviour as str(obj), so # it won't break any existing code. return str(obj) except UnicodeEncodeError: # Else encode it ret = unicode(obj).encode(sys.getdefaultencoding(), 'xmlcharrefreplace') xmlcharref = Regex('&#\d+;') xmlcharref.setParseAction(lambda t: '\\u' + hex(int(t[0][2:-1]))[2:]) return xmlcharref.transformString(ret) # build list of single arg builtins, tolerant of Python version, that can be used as parse actions singleArgBuiltins = [] import __builtin__ for fname in "sum len sorted reversed list tuple set any all min max".split(): try: singleArgBuiltins.append(getattr(__builtin__,fname)) except AttributeError: continue _generatorType = type((y for y in range(1))) def _xml_escape(data): """Escape &, <, >, ", ', etc. in a string of data.""" # ampersand must be replaced first from_symbols = '&><"\'' to_symbols = ('&'+s+';' for s in "amp gt lt quot apos".split()) for from_,to_ in zip(from_symbols, to_symbols): data = data.replace(from_, to_) return data class _Constants(object): pass alphas = string.ascii_uppercase + string.ascii_lowercase nums = "0123456789" hexnums = nums + "ABCDEFabcdef" alphanums = alphas + nums _bslash = chr(92) printables = "".join(c for c in string.printable if c not in string.whitespace) class ParseBaseException(Exception): """base exception class for all parsing runtime exceptions""" # Performance tuning: we construct a *lot* of these, so keep this # constructor as small and fast as possible def __init__( self, pstr, loc=0, msg=None, elem=None ): self.loc = loc if msg is None: self.msg = pstr self.pstr = "" else: self.msg = msg self.pstr = pstr self.parserElement = elem def __getattr__( self, aname ): """supported attributes by name are: - lineno - returns the line number of the exception text - col - returns the column number of the exception text - line - returns the line containing the exception text """ if( aname == "lineno" ): return lineno( self.loc, self.pstr ) elif( aname in ("col", "column") ): return col( self.loc, self.pstr ) elif( aname == "line" ): return line( self.loc, self.pstr ) else: raise AttributeError(aname) def __str__( self ): return "%s (at char %d), (line:%d, col:%d)" % \ ( self.msg, self.loc, self.lineno, self.column ) def __repr__( self ): return _ustr(self) def markInputline( self, markerString = ">!<" ): """Extracts the exception line from the input string, and marks the location of the exception with a special symbol. """ line_str = self.line line_column = self.column - 1 if markerString: line_str = "".join((line_str[:line_column], markerString, line_str[line_column:])) return line_str.strip() def __dir__(self): return "lineno col line".split() + dir(type(self)) class ParseException(ParseBaseException): """exception thrown when parse expressions don't match class; supported attributes by name are: - lineno - returns the line number of the exception text - col - returns the column number of the exception text - line - returns the line containing the exception text """ pass class ParseFatalException(ParseBaseException): """user-throwable exception thrown when inconsistent parse content is found; stops all parsing immediately""" pass class ParseSyntaxException(ParseFatalException): """just like C{L{ParseFatalException}}, but thrown internally when an C{L{ErrorStop}} ('-' operator) indicates that parsing is to stop immediately because an unbacktrackable syntax error has been found""" def __init__(self, pe): super(ParseSyntaxException, self).__init__( pe.pstr, pe.loc, pe.msg, pe.parserElement) #~ class ReparseException(ParseBaseException): #~ """Experimental class - parse actions can raise this exception to cause #~ pyparsing to reparse the input string: #~ - with a modified input string, and/or #~ - with a modified start location #~ Set the values of the ReparseException in the constructor, and raise the #~ exception in a parse action to cause pyparsing to use the new string/location. #~ Setting the values as None causes no change to be made. #~ """ #~ def __init_( self, newstring, restartLoc ): #~ self.newParseText = newstring #~ self.reparseLoc = restartLoc class RecursiveGrammarException(Exception): """exception thrown by C{validate()} if the grammar could be improperly recursive""" def __init__( self, parseElementList ): self.parseElementTrace = parseElementList def __str__( self ): return "RecursiveGrammarException: %s" % self.parseElementTrace class _ParseResultsWithOffset(object): def __init__(self,p1,p2): self.tup = (p1,p2) def __getitem__(self,i): return self.tup[i] def __repr__(self): return repr(self.tup) def setOffset(self,i): self.tup = (self.tup[0],i) class ParseResults(object): """Structured parse results, to provide multiple means of access to the parsed data: - as a list (C{len(results)}) - by list index (C{results[0], results[1]}, etc.) - by attribute (C{results.}) """ def __new__(cls, toklist=None, 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=None, name=None, asList=True, modal=True, isinstance=isinstance ): if self.__doinit: self.__doinit = False self.__name = None self.__parent = None self.__accumNames = {} self.__asList = asList self.__modal = modal if toklist is None: toklist = [] if isinstance(toklist, list): self.__toklist = toklist[:] elif isinstance(toklist, _generatorType): self.__toklist = list(toklist) else: self.__toklist = [toklist] self.__tokdict = dict() if name is not None and name: if not modal: self.__accumNames[name] = 0 if isinstance(name,int): name = _ustr(name) # will always return a str, but use _ustr for consistency self.__name = name if not (isinstance(toklist, (type(None), basestring, list)) and toklist in (None,'',[])): if isinstance(toklist,basestring): toklist = [ toklist ] if asList: if isinstance(toklist,ParseResults): self[name] = _ParseResultsWithOffset(toklist.copy(),0) else: self[name] = _ParseResultsWithOffset(ParseResults(toklist[0]),0) self[name].__name = name else: try: self[name] = toklist[0] except (KeyError,TypeError,IndexError): self[name] = toklist def __getitem__( self, i ): if isinstance( i, (int,slice) ): return self.__toklist[i] else: if i not in self.__accumNames: return self.__tokdict[i][-1][0] else: return ParseResults([ v[0] for v in self.__tokdict[i] ]) def __setitem__( self, k, v, isinstance=isinstance ): if isinstance(v,_ParseResultsWithOffset): self.__tokdict[k] = self.__tokdict.get(k,list()) + [v] sub = v[0] elif isinstance(k,(int,slice)): self.__toklist[k] = v sub = v else: self.__tokdict[k] = self.__tokdict.get(k,list()) + [_ParseResultsWithOffset(v,0)] sub = v if isinstance(sub,ParseResults): sub.__parent = wkref(self) def __delitem__( self, i ): if isinstance(i,(int,slice)): mylen = len( self.__toklist ) del self.__toklist[i] # convert int to slice if isinstance(i, int): if i < 0: i += mylen i = slice(i, i+1) # get removed indices removed = list(range(*i.indices(mylen))) removed.reverse() # fixup indices in token dictionary #~ for name in self.__tokdict: #~ occurrences = self.__tokdict[name] #~ for j in removed: #~ for k, (value, position) in enumerate(occurrences): #~ occurrences[k] = _ParseResultsWithOffset(value, position - (position > j)) for name,occurrences in self.__tokdict.items(): for j in removed: for k, (value, position) in enumerate(occurrences): occurrences[k] = _ParseResultsWithOffset(value, position - (position > j)) else: del self.__tokdict[i] def __contains__( self, k ): return k in self.__tokdict def __len__( self ): return len( self.__toklist ) def __bool__(self): return ( not not self.__toklist ) __nonzero__ = __bool__ def __iter__( self ): return iter( self.__toklist ) def __reversed__( self ): return iter( self.__toklist[::-1] ) def _iterkeys( self ): if hasattr(self.__tokdict, "iterkeys"): return self.__tokdict.iterkeys() else: return iter(self.__tokdict) def _itervalues( self ): return (self[k] for k in self._iterkeys()) def _iteritems( self ): return ((k, self[k]) for k in self._iterkeys()) if PY_3: keys = _iterkeys """Returns an iterator of all named result keys (Python 3.x only).""" values = _itervalues """Returns an iterator of all named result values (Python 3.x only).""" items = _iteritems """Returns an iterator of all named result key-value tuples (Python 3.x only).""" else: iterkeys = _iterkeys """Returns an iterator of all named result keys (Python 2.x only).""" itervalues = _itervalues """Returns an iterator of all named result values (Python 2.x only).""" iteritems = _iteritems """Returns an iterator of all named result key-value tuples (Python 2.x only).""" def keys( self ): """Returns all named result keys (as a list in Python 2.x, as an iterator in Python 3.x).""" return list(self.iterkeys()) def values( self ): """Returns all named result values (as a list in Python 2.x, as an iterator in Python 3.x).""" return list(self.itervalues()) def items( self ): """Returns all named result key-values (as a list of tuples in Python 2.x, as an iterator in Python 3.x).""" return list(self.iteritems()) def haskeys( self ): """Since keys() returns an iterator, this method is helpful in bypassing code that looks for the existence of any defined results names.""" return bool(self.__tokdict) def pop( self, *args, **kwargs): """Removes and returns item at specified index (default=last). Supports both list and dict semantics for pop(). If passed no argument or an integer argument, it will use list semantics and pop tokens from the list of parsed tokens. If passed a non-integer argument (most likely a string), it will use dict semantics and pop the corresponding value from any defined results names. A second default return value argument is supported, just as in dict.pop().""" if not args: args = [-1] for k,v in kwargs.items(): if k == 'default': args = (args[0], v) else: raise TypeError("pop() got an unexpected keyword argument '%s'" % k) if (isinstance(args[0], int) or len(args) == 1 or args[0] in self): index = args[0] ret = self[index] del self[index] return ret else: defaultvalue = args[1] return defaultvalue def get(self, key, defaultValue=None): """Returns named result matching the given key, or if there is no such name, then returns the given C{defaultValue} or C{None} if no C{defaultValue} is specified.""" if key in self: return self[key] else: return defaultValue def insert( self, index, insStr ): """Inserts new element at location index in the list of parsed tokens.""" self.__toklist.insert(index, insStr) # fixup indices in token dictionary #~ for name in self.__tokdict: #~ occurrences = self.__tokdict[name] #~ for k, (value, position) in enumerate(occurrences): #~ occurrences[k] = _ParseResultsWithOffset(value, position + (position > index)) for name,occurrences in self.__tokdict.items(): for k, (value, position) in enumerate(occurrences): occurrences[k] = _ParseResultsWithOffset(value, position + (position > index)) def append( self, item ): """Add single element to end of ParseResults list of elements.""" self.__toklist.append(item) def extend( self, itemseq ): """Add sequence of elements to end of ParseResults list of elements.""" if isinstance(itemseq, ParseResults): self += itemseq else: self.__toklist.extend(itemseq) def clear( self ): """Clear all elements and results names.""" del self.__toklist[:] self.__tokdict.clear() def __getattr__( self, name ): try: return self[name] except KeyError: return "" if name in self.__tokdict: if name not in self.__accumNames: return self.__tokdict[name][-1][0] else: return ParseResults([ v[0] for v in self.__tokdict[name] ]) else: return "" 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: offset if a<0 else a+offset otheritems = other.__tokdict.items() otherdictitems = [(k, _ParseResultsWithOffset(v[0],addoffset(v[1])) ) for (k,vlist) in otheritems for v in vlist] for k,v in otherdictitems: self[k] = v if isinstance(v[0],ParseResults): v[0].__parent = wkref(self) self.__toklist += other.__toklist self.__accumNames.update( other.__accumNames ) return self def __radd__(self, other): if isinstance(other,int) and other == 0: # useful for merging many ParseResults using sum() builtin return self.copy() else: # this may raise a TypeError - so be it return other + self def __repr__( self ): return "(%s, %s)" % ( repr( self.__toklist ), repr( self.__tokdict ) ) def __str__( self ): return '[' + ', '.join(_ustr(i) if isinstance(i, ParseResults) else repr(i) for i in self.__toklist) + ']' 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.""" return [res.asList() if isinstance(res,ParseResults) else res for res in self.__toklist] def asDict( self ): """Returns the named parse results as a nested dictionary.""" if PY_3: item_fn = self.items else: item_fn = self.iteritems def toItem(obj): if isinstance(obj, ParseResults): if obj.haskeys(): return obj.asDict() else: return [toItem(v) for v in obj] else: return obj return dict((k,toItem(v)) for k,v in item_fn()) def copy( self ): """Returns a new copy of a C{ParseResults} object.""" ret = ParseResults( self.__toklist ) ret.__tokdict = self.__tokdict.copy() ret.__parent = self.__parent ret.__accumNames.update( self.__accumNames ) ret.__name = self.__name return ret def asXML( self, doctag=None, namedItemsOnly=False, indent="", formatted=True ): """Returns the parse results as XML. Tags are created for tokens and lists that have defined results names.""" nl = "\n" out = [] namedItems = dict((v[1],k) for (k,vlist) in self.__tokdict.items() for v in vlist) nextLevelIndent = indent + " " # collapse out indents if formatting is not desired if not formatted: indent = "" nextLevelIndent = "" nl = "" selfTag = None if doctag is not None: selfTag = doctag else: if self.__name: selfTag = self.__name if not selfTag: if namedItemsOnly: return "" else: selfTag = "ITEM" out += [ nl, indent, "<", selfTag, ">" ] for i,res in enumerate(self.__toklist): if isinstance(res,ParseResults): if i in namedItems: out += [ res.asXML(namedItems[i], namedItemsOnly and doctag is None, nextLevelIndent, formatted)] else: out += [ res.asXML(None, namedItemsOnly and doctag is None, nextLevelIndent, formatted)] else: # individual token, see if there is a name for it resTag = None if i in namedItems: resTag = namedItems[i] if not resTag: if namedItemsOnly: continue else: resTag = "ITEM" xmlBodyText = _xml_escape(_ustr(res)) out += [ nl, nextLevelIndent, "<", resTag, ">", xmlBodyText, "" ] out += [ nl, indent, "" ] return "".join(out) def __lookup(self,sub): for k,vlist in self.__tokdict.items(): for v,loc in vlist: if sub is v: return k return None def getName(self): """Returns the results name for this token expression.""" if self.__name: return self.__name elif self.__parent: par = self.__parent() if par: return par.__lookup(self) else: return None elif (len(self) == 1 and len(self.__tokdict) == 1 and self.__tokdict.values()[0][0][1] in (0,-1)): return self.__tokdict.keys()[0] else: return None def dump(self,indent='',depth=0): """Diagnostic method for listing out the contents of a C{ParseResults}. Accepts an optional C{indent} argument so that this string can be embedded in a nested display of other data.""" out = [] NL = '\n' out.append( indent+_ustr(self.asList()) ) if self.haskeys(): items = sorted(self.items()) for k,v in items: if out: out.append(NL) out.append( "%s%s- %s: " % (indent,(' '*depth), k) ) if isinstance(v,ParseResults): if v: out.append( v.dump(indent,depth+1) ) else: out.append(_ustr(v)) else: out.append(_ustr(v)) elif any(isinstance(vv,ParseResults) for vv in self): v = self for i,vv in enumerate(v): if isinstance(vv,ParseResults): out.append("\n%s%s[%d]:\n%s%s%s" % (indent,(' '*(depth)),i,indent,(' '*(depth+1)),vv.dump(indent,depth+1) )) else: out.append("\n%s%s[%d]:\n%s%s%s" % (indent,(' '*(depth)),i,indent,(' '*(depth+1)),_ustr(vv))) return "".join(out) def pprint(self, *args, **kwargs): """Pretty-printer for parsed results as a list, using the C{pprint} module. Accepts additional positional or keyword args as defined for the C{pprint.pprint} method. (U{http://docs.python.org/3/library/pprint.html#pprint.pprint})""" pprint.pprint(self.asList(), *args, **kwargs) # add support for pickle protocol def __getstate__(self): return ( self.__toklist, ( self.__tokdict.copy(), self.__parent is not None and self.__parent() or None, self.__accumNames, self.__name ) ) def __setstate__(self,state): self.__toklist = state[0] (self.__tokdict, par, inAccumNames, self.__name) = state[1] self.__accumNames = {} self.__accumNames.update(inAccumNames) if par is not None: self.__parent = wkref(par) else: self.__parent = None def __getnewargs__(self): return self.__toklist, self.__name, self.__asList, self.__modal def __dir__(self): return (dir(type(self)) + list(self.keys())) collections.MutableMapping.register(ParseResults) def col (loc,strg): """Returns current column within a string, counting newlines as line separators. The first column is number 1. Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See L{I{ParserElement.parseString}} for more information on parsing strings containing C{}s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. """ s = strg return 1 if loc} for more information on parsing strings containing C{}s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. """ return strg.count("\n",0,loc) + 1 def line( loc, strg ): """Returns the line of text containing loc within a string, counting newlines as line separators. """ lastCR = strg.rfind("\n", 0, loc) nextCR = strg.find("\n", loc) if nextCR >= 0: return strg[lastCR+1:nextCR] else: return strg[lastCR+1:] def _defaultStartDebugAction( instring, loc, expr ): print (("Match " + _ustr(expr) + " at loc " + _ustr(loc) + "(%d,%d)" % ( lineno(loc,instring), col(loc,instring) ))) def _defaultSuccessDebugAction( instring, startloc, endloc, expr, toks ): print ("Matched " + _ustr(expr) + " -> " + str(toks.asList())) def _defaultExceptionDebugAction( instring, loc, expr, exc ): print ("Exception raised:" + _ustr(exc)) def nullDebugAction(*args): """'Do-nothing' debug action, to suppress debugging output during parsing.""" pass # Only works on Python 3.x - nonlocal is toxic to Python 2 installs #~ 'decorator to trim function calls to match the arity of the target' #~ def _trim_arity(func, maxargs=3): #~ if func in singleArgBuiltins: #~ return lambda s,l,t: func(t) #~ limit = 0 #~ foundArity = False #~ def wrapper(*args): #~ nonlocal limit,foundArity #~ while 1: #~ try: #~ ret = func(*args[limit:]) #~ foundArity = True #~ return ret #~ except TypeError: #~ if limit == maxargs or foundArity: #~ raise #~ limit += 1 #~ continue #~ return wrapper # this version is Python 2.x-3.x cross-compatible 'decorator to trim function calls to match the arity of the target' def _trim_arity(func, maxargs=2): if func in singleArgBuiltins: return lambda s,l,t: func(t) limit = [0] foundArity = [False] # traceback return data structure changed in Py3.5 - normalize back to plain tuples if system_version[:2] >= (3,5): def extract_stack(): # special handling for Python 3.5.0 - extra deep call stack by 1 offset = -3 if system_version == (3,5,0) else -2 frame_summary = traceback.extract_stack()[offset] return [(frame_summary.filename, frame_summary.lineno)] def extract_tb(tb): frames = traceback.extract_tb(tb) frame_summary = frames[-1] return [(frame_summary.filename, frame_summary.lineno)] else: extract_stack = traceback.extract_stack extract_tb = traceback.extract_tb # synthesize what would be returned by traceback.extract_stack at the call to # user's parse action 'func', so that we don't incur call penalty at parse time LINE_DIFF = 6 # IF ANY CODE CHANGES, EVEN JUST COMMENTS OR BLANK LINES, BETWEEN THE NEXT LINE AND # THE CALL TO FUNC INSIDE WRAPPER, LINE_DIFF MUST BE MODIFIED!!!! this_line = extract_stack()[-1] pa_call_line_synth = (this_line[0], this_line[1]+LINE_DIFF) def wrapper(*args): while 1: try: ret = func(*args[limit[0]:]) foundArity[0] = True return ret except TypeError: # re-raise TypeErrors if they did not come from our arity testing if foundArity[0]: raise else: try: tb = sys.exc_info()[-1] if not extract_tb(tb)[-1][:2] == pa_call_line_synth: raise finally: del tb if limit[0] <= maxargs: limit[0] += 1 continue raise # copy func name to wrapper for sensible debug output func_name = "" try: func_name = getattr(func, '__name__', getattr(func, '__class__').__name__) except Exception: func_name = str(func) wrapper.__name__ = func_name return wrapper class ParserElement(object): """Abstract base level parser element class.""" DEFAULT_WHITE_CHARS = " \n\t\r" verbose_stacktrace = False @staticmethod def setDefaultWhitespaceChars( chars ): """Overrides the default whitespace chars """ ParserElement.DEFAULT_WHITE_CHARS = chars @staticmethod def inlineLiteralsUsing(cls): """ Set class to be used for inclusion of string literals into a parser. """ ParserElement._literalStringClass = cls def __init__( self, savelist=False ): self.parseAction = list() self.failAction = None #~ self.name = "" # don't define self.name, let subclasses try/except upcall self.strRepr = None self.resultsName = None self.saveAsList = savelist self.skipWhitespace = True self.whiteChars = ParserElement.DEFAULT_WHITE_CHARS self.copyDefaultWhiteChars = True self.mayReturnEmpty = False # used when checking for left-recursion self.keepTabs = False self.ignoreExprs = list() self.debug = False self.streamlined = False self.mayIndexError = True # used to optimize exception handling for subclasses that don't advance parse index self.errmsg = "" self.modalResults = True # used to mark results names as modal (report only last) or cumulative (list all) self.debugActions = ( None, None, None ) #custom debug actions self.re = None self.callPreparse = True # used to avoid redundant calls to preParse self.callDuringTry = False def copy( self ): """Make a copy of this C{ParserElement}. Useful for defining different parse actions for the same parsing pattern, using copies of the original parse element.""" cpy = copy.copy( self ) cpy.parseAction = self.parseAction[:] cpy.ignoreExprs = self.ignoreExprs[:] if self.copyDefaultWhiteChars: cpy.whiteChars = ParserElement.DEFAULT_WHITE_CHARS return cpy def setName( self, name ): """Define name for this expression, for use in debugging.""" self.name = name self.errmsg = "Expected " + self.name if hasattr(self,"exception"): self.exception.msg = self.errmsg return self def setResultsName( self, name, listAllMatches=False ): """Define name for referencing matching tokens as a nested attribute of the returned parse results. NOTE: this returns a *copy* of the original C{ParserElement} object; this is so that the client can define a basic element, such as an integer, and reference it in multiple places with different names. You can also set results names using the abbreviated syntax, C{expr("name")} in place of C{expr.setResultsName("name")} - see L{I{__call__}<__call__>}. """ newself = self.copy() if name.endswith("*"): name = name[:-1] listAllMatches=True newself.resultsName = name newself.modalResults = not listAllMatches return newself def setBreak(self,breakFlag = True): """Method to invoke the Python pdb debugger when this element is about to be parsed. Set C{breakFlag} to True to enable, False to disable. """ if breakFlag: _parseMethod = self._parse def breaker(instring, loc, doActions=True, callPreParse=True): import pdb pdb.set_trace() return _parseMethod( instring, loc, doActions, callPreParse ) breaker._originalParseMethod = _parseMethod self._parse = breaker else: if hasattr(self._parse,"_originalParseMethod"): self._parse = self._parse._originalParseMethod return self def setParseAction( self, *fns, **kwargs ): """Define action to perform when successfully matching parse element definition. Parse action fn is a callable method with 0-3 arguments, called as C{fn(s,loc,toks)}, C{fn(loc,toks)}, C{fn(toks)}, or just C{fn()}, where: - s = the original string being parsed (see note below) - loc = the location of the matching substring - toks = a list of the matched tokens, packaged as a C{L{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. Optional keyword arguments: - callDuringTry = (default=False) indicate if parse action should be run during lookaheads and alternate testing Note: the default parsing behavior is to expand tabs in the input string before starting the parsing process. See L{I{parseString}} for more information on parsing strings containing C{}s, and suggested methods to maintain a consistent view of the parsed string, the parse location, and line and column positions within the parsed string. """ self.parseAction = list(map(_trim_arity, list(fns))) self.callDuringTry = kwargs.get("callDuringTry", False) return self def addParseAction( self, *fns, **kwargs ): """Add parse action to expression's list of parse actions. See L{I{setParseAction}}.""" self.parseAction += list(map(_trim_arity, list(fns))) self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False) return self def addCondition(self, *fns, **kwargs): """Add a boolean predicate function to expression's list of parse actions. See L{I{setParseAction}} for function call signatures. Unlike C{setParseAction}, functions passed to C{addCondition} need to return boolean success/fail of the condition. Optional keyword arguments: - message = define a custom message to be used in the raised exception - fatal = if True, will raise ParseFatalException to stop parsing immediately; otherwise will raise ParseException """ msg = kwargs.get("message", "failed user-defined condition") exc_type = ParseFatalException if kwargs.get("fatal", False) else ParseException for fn in fns: def pa(s,l,t): if not bool(_trim_arity(fn)(s,l,t)): raise exc_type(s,l,msg) self.parseAction.append(pa) self.callDuringTry = self.callDuringTry or kwargs.get("callDuringTry", False) return self def setFailAction( self, fn ): """Define action to perform if parsing fails at this expression. Fail acton fn is a callable function that takes the arguments C{fn(s,loc,expr,err)} where: - s = string being parsed - loc = location where expression match was attempted and failed - expr = the parse expression that failed - err = the exception thrown The function returns no value. It may throw C{L{ParseFatalException}} if it is desired to stop parsing immediately.""" self.failAction = fn return self def _skipIgnorables( self, instring, loc ): exprsFound = True while exprsFound: exprsFound = False for e in self.ignoreExprs: try: while 1: loc,dummy = e._parse( instring, loc ) exprsFound = True except ParseException: pass return loc def preParse( self, instring, loc ): if self.ignoreExprs: loc = self._skipIgnorables( instring, loc ) if self.skipWhitespace: wt = self.whiteChars instrlen = len(instring) while loc < instrlen and instring[loc] in wt: loc += 1 return loc def parseImpl( self, instring, loc, doActions=True ): return loc, [] def postParse( self, instring, loc, tokenlist ): return tokenlist #~ @profile def _parseNoCache( self, instring, loc, doActions=True, callPreParse=True ): debugging = ( self.debug ) #and doActions ) if debugging or self.failAction: #~ print ("Match",self,"at loc",loc,"(%d,%d)" % ( lineno(loc,instring), col(loc,instring) )) if (self.debugActions[0] ): self.debugActions[0]( instring, loc, self ) if callPreParse and self.callPreparse: preloc = self.preParse( instring, loc ) else: preloc = loc tokensStart = preloc try: try: loc,tokens = self.parseImpl( instring, preloc, doActions ) except IndexError: raise ParseException( instring, len(instring), self.errmsg, self ) except ParseBaseException as 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 and self.callPreparse: preloc = self.preParse( instring, loc ) else: preloc = loc tokensStart = preloc if self.mayIndexError or loc >= len(instring): try: loc,tokens = self.parseImpl( instring, preloc, doActions ) except IndexError: raise ParseException( instring, len(instring), self.errmsg, self ) else: loc,tokens = self.parseImpl( instring, preloc, doActions ) tokens = self.postParse( instring, loc, tokens ) retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList, modal=self.modalResults ) if self.parseAction and (doActions or self.callDuringTry): if debugging: try: for fn in self.parseAction: tokens = fn( instring, tokensStart, retTokens ) if tokens is not None: retTokens = ParseResults( tokens, self.resultsName, asList=self.saveAsList and isinstance(tokens,(ParseResults,list)), modal=self.modalResults ) except ParseBaseException as 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 ): try: return self._parse( instring, loc, doActions=False )[0] except ParseFatalException: raise ParseException( instring, loc, self.errmsg, self) def canParseNext(self, instring, loc): try: self.tryParse(instring, loc) except (ParseException, IndexError): return False else: return True # this method gets repeatedly called during backtracking with the same arguments - # we can cache these arguments and save ourselves the trouble of re-parsing the contained expression def _parseCache( self, instring, loc, doActions=True, callPreParse=True ): lookup = (self,instring,loc,callPreParse,doActions) if lookup in ParserElement._exprArgCache: value = ParserElement._exprArgCache[ lookup ] if isinstance(value, Exception): raise value return (value[0],value[1].copy()) else: try: value = self._parseNoCache( instring, loc, doActions, callPreParse ) ParserElement._exprArgCache[ lookup ] = (value[0],value[1].copy()) return value except ParseBaseException as pe: pe.__traceback__ = None ParserElement._exprArgCache[ lookup ] = pe raise _parse = _parseNoCache # argument cache for optimizing repeated calls when backtracking through recursive expressions _exprArgCache = {} @staticmethod def resetCache(): ParserElement._exprArgCache.clear() _packratEnabled = False @staticmethod def enablePackrat(): """Enables "packrat" parsing, which adds memoizing to the parsing logic. Repeated parse attempts at the same string location (which happens often in many complex grammars) can immediately return a cached value, instead of re-executing parsing/validating code. Memoizing is done of both valid results and parsing exceptions. This speedup may break existing programs that use parse actions that have side-effects. For this reason, packrat parsing is disabled when you first import pyparsing. To activate the packrat feature, your program must call the class method C{ParserElement.enablePackrat()}. If your program uses C{psyco} to "compile as you go", you must call C{enablePackrat} before calling C{psyco.full()}. If you do not do this, Python will crash. For best results, call C{enablePackrat()} immediately after importing pyparsing. """ if not ParserElement._packratEnabled: ParserElement._packratEnabled = True ParserElement._parse = ParserElement._parseCache def parseString( self, instring, parseAll=False ): """Execute the parse expression with the given string. This is the main interface to the client code, once the complete expression has been built. If you want the grammar to require that the entire input string be successfully parsed, then set C{parseAll} to True (equivalent to ending the grammar with C{L{StringEnd()}}). Note: C{parseString} implicitly calls C{expandtabs()} on the input string, in order to report proper column numbers in parse actions. If the input string contains tabs and the grammar uses parse actions that use the C{loc} argument to index into the string being parsed, you can ensure you have a consistent view of the input string by: - calling C{parseWithTabs} on your grammar before calling C{parseString} (see L{I{parseWithTabs}}) - define your parse action using the full C{(s,loc,toks)} signature, and reference the input string using the parse action's C{s} argument - explictly expand the tabs in your input string before calling C{parseString} """ ParserElement.resetCache() if not self.streamlined: self.streamline() #~ self.saveAsList = True for e in self.ignoreExprs: e.streamline() if not self.keepTabs: instring = instring.expandtabs() try: loc, tokens = self._parse( instring, 0 ) if parseAll: loc = self.preParse( instring, loc ) se = Empty() + StringEnd() se._parse( instring, loc ) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc else: return tokens def scanString( self, instring, maxMatches=_MAX_INT, overlap=False ): """Scan the input string for expression matches. Each match will return the matching tokens, start location, and end location. May be called with optional C{maxMatches} argument, to clip scanning after 'n' matches are found. If C{overlap} is specified, then overlapping matches will be reported. Note that the start and end locations are reported relative to the string being parsed. See L{I{parseString}} for more information on parsing strings with embedded tabs.""" if not self.streamlined: self.streamline() for e in self.ignoreExprs: e.streamline() if not self.keepTabs: instring = _ustr(instring).expandtabs() instrlen = len(instring) loc = 0 preparseFn = self.preParse parseFn = self._parse ParserElement.resetCache() matches = 0 try: while loc <= instrlen and matches < maxMatches: try: preloc = preparseFn( instring, loc ) nextLoc,tokens = parseFn( instring, preloc, callPreParse=False ) except ParseException: loc = preloc+1 else: if nextLoc > loc: matches += 1 yield tokens, preloc, nextLoc if overlap: nextloc = preparseFn( instring, loc ) if nextloc > loc: loc = nextLoc else: loc += 1 else: loc = nextLoc else: loc = preloc+1 except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc def transformString( self, instring ): """Extension to C{L{scanString}}, to modify matching text with modified tokens that may be returned from a parse action. To use C{transformString}, define a grammar and attach a parse action to it that modifies the returned token list. Invoking C{transformString()} on a target string will then scan for matches, and replace the matched text patterns according to the logic in the parse action. C{transformString()} returns the resulting transformed string.""" out = [] lastE = 0 # force preservation of s, to minimize unwanted transformation of string, and to # keep string locs straight between transformString and scanString self.keepTabs = True try: for t,s,e in self.scanString( instring ): out.append( instring[lastE:s] ) if t: if isinstance(t,ParseResults): out += t.asList() elif isinstance(t,list): out += t else: out.append(t) lastE = e out.append(instring[lastE:]) out = [o for o in out if o] return "".join(map(_ustr,_flatten(out))) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc def searchString( self, instring, maxMatches=_MAX_INT ): """Another extension to C{L{scanString}}, simplifying the access to the tokens found to match the given parse expression. May be called with optional C{maxMatches} argument, to clip searching after 'n' matches are found. """ try: return ParseResults([ t for t,s,e in self.scanString( instring, maxMatches ) ]) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc def split(self, instring, maxsplit=_MAX_INT, includeSeparators=False): """Generator method to split a string using the given expression as a separator. May be called with optional C{maxsplit} argument, to limit the number of splits; and the optional C{includeSeparators} argument (default=C{False}), if the separating matching text should be included in the split results. """ splits = 0 last = 0 for t,s,e in self.scanString(instring, maxMatches=maxsplit): yield instring[last:s] if includeSeparators: yield t[0] last = e yield instring[last:] def __add__(self, other ): """Implementation of + operator - returns C{L{And}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return And( [ self, other ] ) def __radd__(self, other ): """Implementation of + operator when left operand is not a C{L{ParserElement}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other + self def __sub__(self, other): """Implementation of - operator, returns C{L{And}} with error stop""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return And( [ self, And._ErrorStop(), other ] ) def __rsub__(self, other ): """Implementation of - operator when left operand is not a C{L{ParserElement}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other - self def __mul__(self,other): """Implementation of * operator, allows use of C{expr * 3} in place of C{expr + expr + expr}. Expressions may also me multiplied by a 2-integer tuple, similar to C{{min,max}} multipliers in regular expressions. Tuples may also include C{None} as in: - C{expr*(n,None)} or C{expr*(n,)} is equivalent to C{expr*n + L{ZeroOrMore}(expr)} (read as "at least n instances of C{expr}") - C{expr*(None,n)} is equivalent to C{expr*(0,n)} (read as "0 to n instances of C{expr}") - C{expr*(None,None)} is equivalent to C{L{ZeroOrMore}(expr)} - C{expr*(1,None)} is equivalent to C{L{OneOrMore}(expr)} Note that C{expr*(None,n)} does not raise an exception if more than n exprs exist in the input stream; that is, C{expr*(None,n)} does not enforce a maximum number of expr occurrences. If this behavior is desired, then write C{expr*(None,n) + ~expr} """ if isinstance(other,int): minElements, optElements = other,0 elif isinstance(other,tuple): other = (other + (None, None))[:2] if other[0] is None: other = (0, other[1]) if isinstance(other[0],int) and other[1] is None: if other[0] == 0: return ZeroOrMore(self) if other[0] == 1: return OneOrMore(self) else: return self*other[0] + ZeroOrMore(self) elif isinstance(other[0],int) and isinstance(other[1],int): minElements, optElements = other optElements -= minElements else: raise TypeError("cannot multiply 'ParserElement' and ('%s','%s') objects", type(other[0]),type(other[1])) else: raise TypeError("cannot multiply 'ParserElement' and '%s' objects", type(other)) if minElements < 0: raise ValueError("cannot multiply ParserElement by negative value") if optElements < 0: raise ValueError("second tuple value must be greater or equal to first tuple value") if minElements == optElements == 0: raise ValueError("cannot multiply ParserElement by 0 or (0,0)") if (optElements): def makeOptionalList(n): if n>1: return Optional(self + makeOptionalList(n-1)) else: return Optional(self) if minElements: if minElements == 1: ret = self + makeOptionalList(optElements) else: ret = And([self]*minElements) + makeOptionalList(optElements) else: ret = makeOptionalList(optElements) else: if minElements == 1: ret = self else: ret = And([self]*minElements) return ret def __rmul__(self, other): return self.__mul__(other) def __or__(self, other ): """Implementation of | operator - returns C{L{MatchFirst}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return MatchFirst( [ self, other ] ) def __ror__(self, other ): """Implementation of | operator when left operand is not a C{L{ParserElement}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other | self def __xor__(self, other ): """Implementation of ^ operator - returns C{L{Or}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return Or( [ self, other ] ) def __rxor__(self, other ): """Implementation of ^ operator when left operand is not a C{L{ParserElement}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other ^ self def __and__(self, other ): """Implementation of & operator - returns C{L{Each}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return Each( [ self, other ] ) def __rand__(self, other ): """Implementation of & operator when left operand is not a C{L{ParserElement}}""" if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) if not isinstance( other, ParserElement ): warnings.warn("Cannot combine element of type %s with ParserElement" % type(other), SyntaxWarning, stacklevel=2) return None return other & self def __invert__( self ): """Implementation of ~ operator - returns C{L{NotAny}}""" return NotAny( self ) def __call__(self, name=None): """Shortcut for C{L{setResultsName}}, with C{listAllMatches=default}:: userdata = Word(alphas).setResultsName("name") + Word(nums+"-").setResultsName("socsecno") could be written as:: userdata = Word(alphas)("name") + Word(nums+"-")("socsecno") If C{name} is given with a trailing C{'*'} character, then C{listAllMatches} will be passed as C{True}. If C{name} is omitted, same as calling C{L{copy}}. """ if name is not None: return self.setResultsName(name) else: return self.copy() def suppress( self ): """Suppresses the output of this C{ParserElement}; useful to keep punctuation from cluttering up returned output. """ return Suppress( self ) def leaveWhitespace( self ): """Disables the skipping of whitespace before matching the characters in the C{ParserElement}'s defined pattern. This is normally only used internally by the pyparsing module, but may be needed in some whitespace-sensitive grammars. """ self.skipWhitespace = False return self def setWhitespaceChars( self, chars ): """Overrides the default whitespace chars """ self.skipWhitespace = True self.whiteChars = chars self.copyDefaultWhiteChars = False return self def parseWithTabs( self ): """Overrides default behavior to expand C{}s to spaces before parsing the input string. Must be called before C{parseString} when the input grammar contains elements that match C{} 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, basestring): other = Suppress(other) if isinstance( other, Suppress ): if other not in self.ignoreExprs: self.ignoreExprs.append(other) else: self.ignoreExprs.append( Suppress( other.copy() ) ) return self def setDebugActions( self, startAction, successAction, exceptionAction ): """Enable display of debugging messages while doing pattern matching.""" self.debugActions = (startAction or _defaultStartDebugAction, successAction or _defaultSuccessDebugAction, exceptionAction or _defaultExceptionDebugAction) self.debug = True return self def setDebug( self, flag=True ): """Enable display of debugging messages while doing pattern matching. Set C{flag} to True to enable, False to disable.""" if flag: self.setDebugActions( _defaultStartDebugAction, _defaultSuccessDebugAction, _defaultExceptionDebugAction ) else: self.debug = False return self def __str__( self ): return self.name def __repr__( self ): return _ustr(self) def streamline( self ): self.streamlined = True self.strRepr = None return self def checkRecursion( self, parseElementList ): pass def validate( self, validateTrace=[] ): """Check defined expressions for valid structure, check for infinite recursive definitions.""" self.checkRecursion( [] ) def parseFile( self, file_or_filename, parseAll=False ): """Execute the parse expression on the given file or filename. If a filename is specified (instead of a file object), the entire file is opened, read, and closed before parsing. """ try: file_contents = file_or_filename.read() except AttributeError: with open(file_or_filename, "r") as f: file_contents = f.read() try: return self.parseString(file_contents, parseAll) except ParseBaseException as exc: if ParserElement.verbose_stacktrace: raise else: # catch and re-raise exception from here, clears out pyparsing internal stack trace raise exc def __eq__(self,other): if isinstance(other, ParserElement): return self is other or vars(self) == vars(other) elif isinstance(other, basestring): return self.matches(other) else: return super(ParserElement,self)==other def __ne__(self,other): return not (self == other) def __hash__(self): return hash(id(self)) def __req__(self,other): return self == other def __rne__(self,other): return not (self == other) def matches(self, testString, parseAll=True): """Method for quick testing of a parser against a test string. Good for simple inline microtests of sub expressions while building up larger parser, as in:: expr = Word(nums) assert expr.matches("100") Parameters: - testString - to test against this expression for a match - parseAll - (default=True) - flag to pass to C{L{parseString}} when running tests """ try: self.parseString(_ustr(testString), parseAll=parseAll) return True except ParseBaseException: return False def runTests(self, tests, parseAll=True, comment='#', printResults=True, failureTests=False): """Execute the parse expression on a series of test strings, showing each test, the parsed results or where the parse failed. Quick and easy way to run a parse expression against a list of sample strings. Parameters: - tests - a list of separate test strings, or a multiline string of test strings - parseAll - (default=True) - flag to pass to C{L{parseString}} when running tests - comment - (default='#') - expression for indicating embedded comments in the test string; pass None to disable comment filtering - printResults - (default=True) prints test output to stdout - failureTests - (default=False) indicates if these tests are expected to fail parsing Returns: a (success, results) tuple, where success indicates that all tests succeeded (or failed if C{failureTest} is True), and the results contain a list of lines of each test's output """ if isinstance(tests, basestring): tests = list(map(str.strip, tests.rstrip().splitlines())) if isinstance(comment, basestring): comment = Literal(comment) allResults = [] comments = [] success = True for t in tests: if comment is not None and comment.matches(t, False) or comments and not t: comments.append(t) continue if not t: continue out = ['\n'.join(comments), t] comments = [] try: result = self.parseString(t, parseAll=parseAll) out.append(result.dump()) success = success and not failureTests except ParseBaseException as pe: fatal = "(FATAL)" if isinstance(pe, ParseFatalException) else "" if '\n' in t: out.append(line(pe.loc, t)) out.append(' '*(col(pe.loc,t)-1) + '^' + fatal) else: out.append(' '*pe.loc + '^' + fatal) out.append("FAIL: " + str(pe)) success = success and failureTests result = pe if printResults: out.append('') print('\n'.join(out)) allResults.append((t, result)) return success, allResults class Token(ParserElement): """Abstract C{ParserElement} subclass, for defining atomic matching patterns.""" def __init__( self ): super(Token,self).__init__( savelist=False ) class Empty(Token): """An empty token, will always match.""" def __init__( self ): super(Empty,self).__init__() self.name = "Empty" self.mayReturnEmpty = True self.mayIndexError = False class NoMatch(Token): """A token that will never match.""" def __init__( self ): super(NoMatch,self).__init__() self.name = "NoMatch" self.mayReturnEmpty = True self.mayIndexError = False self.errmsg = "Unmatchable token" def parseImpl( self, instring, loc, doActions=True ): raise ParseException(instring, loc, self.errmsg, self) class Literal(Token): """Token to exactly match a specified string.""" def __init__( self, matchString ): super(Literal,self).__init__() self.match = matchString self.matchLen = len(matchString) try: self.firstMatchChar = matchString[0] except IndexError: warnings.warn("null string passed to Literal; use Empty() instead", SyntaxWarning, stacklevel=2) self.__class__ = Empty self.name = '"%s"' % _ustr(self.match) self.errmsg = "Expected " + self.name self.mayReturnEmpty = False self.mayIndexError = False # Performance tuning: this routine gets called a *lot* # if this is a single character match string and the first character matches, # short-circuit as quickly as possible, and avoid calling startswith #~ @profile def parseImpl( self, instring, loc, doActions=True ): if (instring[loc] == self.firstMatchChar and (self.matchLen==1 or instring.startswith(self.match,loc)) ): return loc+self.matchLen, self.match raise ParseException(instring, loc, self.errmsg, self) _L = Literal ParserElement._literalStringClass = Literal class Keyword(Token): """Token to exactly match a specified string as a keyword, that is, it must be immediately followed by a non-keyword character. Compare with C{L{Literal}}: - C{Literal("if")} will match the leading C{'if'} in C{'ifAndOnlyIf'}. - C{Keyword("if")} will not; it will only match the leading C{'if'} in C{'if x=1'}, or C{'if(y==2)'} Accepts two optional constructor arguments in addition to the keyword string: - C{identChars} is a string of characters that would be valid identifier characters, defaulting to all alphanumerics + "_" and "$" - C{caseless} allows case-insensitive matching, default is C{False}. """ DEFAULT_KEYWORD_CHARS = alphanums+"_$" def __init__( self, matchString, identChars=DEFAULT_KEYWORD_CHARS, caseless=False ): super(Keyword,self).__init__() self.match = matchString self.matchLen = len(matchString) try: self.firstMatchChar = matchString[0] except IndexError: warnings.warn("null string passed to Keyword; use Empty() instead", SyntaxWarning, stacklevel=2) self.name = '"%s"' % self.match self.errmsg = "Expected " + self.name self.mayReturnEmpty = False self.mayIndexError = False self.caseless = caseless if caseless: self.caselessmatch = matchString.upper() identChars = identChars.upper() self.identChars = set(identChars) def parseImpl( self, instring, loc, doActions=True ): if self.caseless: if ( (instring[ loc:loc+self.matchLen ].upper() == self.caselessmatch) and (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen].upper() not in self.identChars) and (loc == 0 or instring[loc-1].upper() not in self.identChars) ): return loc+self.matchLen, self.match else: if (instring[loc] == self.firstMatchChar and (self.matchLen==1 or instring.startswith(self.match,loc)) and (loc >= len(instring)-self.matchLen or instring[loc+self.matchLen] not in self.identChars) and (loc == 0 or instring[loc-1] not in self.identChars) ): return loc+self.matchLen, self.match raise ParseException(instring, loc, self.errmsg, self) def copy(self): c = super(Keyword,self).copy() c.identChars = Keyword.DEFAULT_KEYWORD_CHARS return c @staticmethod def setDefaultKeywordChars( chars ): """Overrides the default Keyword chars """ Keyword.DEFAULT_KEYWORD_CHARS = chars class CaselessLiteral(Literal): """Token to match a specified string, ignoring case of letters. Note: the matched results will always be in the case of the given match string, NOT the case of the input text. """ def __init__( self, matchString ): super(CaselessLiteral,self).__init__( matchString.upper() ) # Preserve the defining literal. self.returnString = matchString self.name = "'%s'" % self.returnString self.errmsg = "Expected " + self.name def parseImpl( self, instring, loc, doActions=True ): if instring[ loc:loc+self.matchLen ].upper() == self.match: return loc+self.matchLen, self.returnString raise ParseException(instring, loc, self.errmsg, self) 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, self) class Word(Token): """Token for matching words composed of allowed character sets. Defined with string containing all allowed initial characters, an optional string containing allowed body characters (if omitted, defaults to the initial character set), and an optional minimum, maximum, and/or exact length. The default value for C{min} is 1 (a minimum value < 1 is not valid); the default values for C{max} and C{exact} are 0, meaning no maximum or exact length restriction. An optional C{excludeChars} parameter can list characters that might be found in the input C{bodyChars} string; useful to define a word of all printables except for one or two characters, for instance. """ def __init__( self, initChars, bodyChars=None, min=1, max=0, exact=0, asKeyword=False, excludeChars=None ): super(Word,self).__init__() if excludeChars: initChars = ''.join(c for c in initChars if c not in excludeChars) if bodyChars: bodyChars = ''.join(c for c in bodyChars if c not in excludeChars) self.initCharsOrig = initChars self.initChars = set(initChars) if bodyChars : self.bodyCharsOrig = bodyChars self.bodyChars = set(bodyChars) else: self.bodyCharsOrig = initChars self.bodyChars = set(initChars) self.maxSpecified = max > 0 if min < 1: raise ValueError("cannot specify a minimum length < 1; use Optional(Word()) if zero-length word is permitted") self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact self.name = _ustr(self) self.errmsg = "Expected " + self.name self.mayIndexError = False self.asKeyword = asKeyword if ' ' not in self.initCharsOrig+self.bodyCharsOrig and (min==1 and max==0 and exact==0): if self.bodyCharsOrig == self.initCharsOrig: self.reString = "[%s]+" % _escapeRegexRangeChars(self.initCharsOrig) elif len(self.initCharsOrig) == 1: self.reString = "%s[%s]*" % \ (re.escape(self.initCharsOrig), _escapeRegexRangeChars(self.bodyCharsOrig),) else: self.reString = "[%s][%s]*" % \ (_escapeRegexRangeChars(self.initCharsOrig), _escapeRegexRangeChars(self.bodyCharsOrig),) if self.asKeyword: self.reString = r"\b"+self.reString+r"\b" try: self.re = re.compile( self.reString ) except: self.re = None def parseImpl( self, instring, loc, doActions=True ): if self.re: result = self.re.match(instring,loc) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() return loc, result.group() if not(instring[ loc ] in self.initChars): raise ParseException(instring, loc, self.errmsg, self) start = loc loc += 1 instrlen = len(instring) bodychars = self.bodyChars maxloc = start + self.maxLen maxloc = min( maxloc, instrlen ) while loc < maxloc and instring[loc] in bodychars: loc += 1 throwException = False if loc - start < self.minLen: throwException = True if self.maxSpecified and loc < instrlen and instring[loc] in bodychars: throwException = True if self.asKeyword: if (start>0 and instring[start-1] in bodychars) or (loc4: return s[:4]+"..." else: return s if ( self.initCharsOrig != self.bodyCharsOrig ): self.strRepr = "W:(%s,%s)" % ( charsAsStr(self.initCharsOrig), charsAsStr(self.bodyCharsOrig) ) else: self.strRepr = "W:(%s)" % charsAsStr(self.initCharsOrig) return self.strRepr class Regex(Token): """Token for matching strings that match a given regular expression. Defined with string specifying the regular expression in a form recognized by the inbuilt Python re module. """ compiledREtype = type(re.compile("[A-Z]")) def __init__( self, pattern, flags=0): """The parameters C{pattern} and C{flags} are passed to the C{re.compile()} function as-is. See the Python C{re} module for an explanation of the acceptable patterns and flags.""" super(Regex,self).__init__() if isinstance(pattern, basestring): if not pattern: warnings.warn("null string passed to Regex; use Empty() instead", SyntaxWarning, stacklevel=2) self.pattern = pattern self.flags = flags try: self.re = re.compile(self.pattern, self.flags) self.reString = self.pattern except sre_constants.error: warnings.warn("invalid pattern (%s) passed to Regex" % pattern, SyntaxWarning, stacklevel=2) raise elif isinstance(pattern, Regex.compiledREtype): self.re = pattern self.pattern = \ self.reString = str(pattern) self.flags = flags else: raise ValueError("Regex may only be constructed with a string or a compiled RE object") self.name = _ustr(self) self.errmsg = "Expected " + self.name self.mayIndexError = False self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): result = self.re.match(instring,loc) if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() d = result.groupdict() ret = ParseResults(result.group()) if d: for k in d: ret[k] = d[k] return loc,ret def __str__( self ): try: return super(Regex,self).__str__() except: pass if self.strRepr is None: self.strRepr = "Re:(%s)" % repr(self.pattern) return self.strRepr class QuotedString(Token): """Token for matching strings that are delimited by quoting characters. """ def __init__( self, quoteChar, escChar=None, escQuote=None, multiline=False, unquoteResults=True, endQuoteChar=None, convertWhitespaceEscapes=True): r"""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=C{False}) - unquoteResults - boolean indicating whether the matched text should be unquoted (default=C{True}) - endQuoteChar - string of one or more characters defining the end of the quote delimited string (default=C{None} => same as quoteChar) - convertWhitespaceEscapes - convert escaped whitespace (C{'\t'}, C{'\n'}, etc.) to actual whitespace (default=C{True}) """ super(QuotedString,self).__init__() # remove white space from quote chars - wont work anyway quoteChar = quoteChar.strip() if not quoteChar: warnings.warn("quoteChar cannot be the empty string",SyntaxWarning,stacklevel=2) raise SyntaxError() if endQuoteChar is None: endQuoteChar = quoteChar else: endQuoteChar = endQuoteChar.strip() if not endQuoteChar: 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 self.convertWhitespaceEscapes = convertWhitespaceEscapes 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: warnings.warn("invalid pattern (%s) passed to Regex" % self.pattern, SyntaxWarning, stacklevel=2) raise self.name = _ustr(self) self.errmsg = "Expected " + self.name self.mayIndexError = False self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): result = instring[loc] == self.firstQuoteChar and self.re.match(instring,loc) or None if not result: raise ParseException(instring, loc, self.errmsg, self) loc = result.end() ret = result.group() if self.unquoteResults: # strip off quotes ret = ret[self.quoteCharLen:-self.endQuoteCharLen] if isinstance(ret,basestring): # replace escaped whitespace if '\\' in ret and self.convertWhitespaceEscapes: ws_map = { r'\t' : '\t', r'\n' : '\n', r'\f' : '\f', r'\r' : '\r', } for wslit,wschar in ws_map.items(): ret = ret.replace(wslit, wschar) # replace escaped characters if self.escChar: ret = re.sub(self.escCharReplacePattern,"\g<1>",ret) # replace escaped quotes if self.escQuote: ret = ret.replace(self.escQuote, self.endQuoteChar) return loc, ret def __str__( self ): try: return super(QuotedString,self).__str__() except: pass if self.strRepr is None: self.strRepr = "quoted string, starting with %s ending with %s" % (self.quoteChar, self.endQuoteChar) return self.strRepr class CharsNotIn(Token): """Token for matching words composed of characters *not* in a given set. Defined with string containing all disallowed characters, and an optional minimum, maximum, and/or exact length. The default value for C{min} is 1 (a minimum value < 1 is not valid); the default values for C{max} and C{exact} are 0, meaning no maximum or exact length restriction. """ def __init__( self, notChars, min=1, max=0, exact=0 ): super(CharsNotIn,self).__init__() self.skipWhitespace = False self.notChars = notChars if min < 1: raise ValueError("cannot specify a minimum length < 1; use Optional(CharsNotIn()) if zero-length char group is permitted") self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact self.name = _ustr(self) self.errmsg = "Expected " + self.name self.mayReturnEmpty = ( self.minLen == 0 ) self.mayIndexError = False def parseImpl( self, instring, loc, doActions=True ): if instring[loc] in self.notChars: raise ParseException(instring, loc, self.errmsg, self) 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, self) return loc, instring[start:loc] def __str__( self ): try: return super(CharsNotIn, self).__str__() except: pass if self.strRepr is None: if len(self.notChars) > 4: self.strRepr = "!W:(%s...)" % self.notChars[:4] else: self.strRepr = "!W:(%s)" % self.notChars return self.strRepr class White(Token): """Special matching class for matching whitespace. Normally, whitespace is ignored by pyparsing grammars. This class is included when some whitespace structures are significant. Define with a string containing the whitespace characters to be matched; default is C{" \\t\\r\\n"}. Also takes optional C{min}, C{max}, and C{exact} arguments, as defined for the C{L{Word}} class.""" whiteStrs = { " " : "", "\t": "", "\n": "", "\r": "", "\f": "", } def __init__(self, ws=" \t\r\n", min=1, max=0, exact=0): super(White,self).__init__() self.matchWhite = ws self.setWhitespaceChars( "".join(c for c in self.whiteChars if c not in self.matchWhite) ) #~ self.leaveWhitespace() self.name = ("".join(White.whiteStrs[c] for c in self.matchWhite)) self.mayReturnEmpty = True self.errmsg = "Expected " + self.name self.minLen = min if max > 0: self.maxLen = max else: self.maxLen = _MAX_INT if exact > 0: self.maxLen = exact self.minLen = exact def parseImpl( self, instring, loc, doActions=True ): if not(instring[ loc ] in self.matchWhite): raise ParseException(instring, loc, self.errmsg, self) 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, self) return loc, instring[start:loc] class _PositionToken(Token): def __init__( self ): super(_PositionToken,self).__init__() self.name=self.__class__.__name__ self.mayReturnEmpty = True self.mayIndexError = False class GoToColumn(_PositionToken): """Token to advance to a specific column of input text; useful for tabular report scraping.""" def __init__( self, colno ): super(GoToColumn,self).__init__() self.col = colno def preParse( self, instring, loc ): if col(loc,instring) != self.col: instrlen = len(instring) if self.ignoreExprs: loc = self._skipIgnorables( instring, loc ) while loc < instrlen and instring[loc].isspace() and col( loc, instring ) != self.col : loc += 1 return loc def parseImpl( self, instring, loc, doActions=True ): thiscol = col( loc, instring ) if thiscol > self.col: raise ParseException( instring, loc, "Text not in expected column", self ) newloc = loc + self.col - thiscol ret = instring[ loc: newloc ] return newloc, ret class LineStart(_PositionToken): """Matches if current position is at the beginning of a line within the parse string""" def __init__( self ): super(LineStart,self).__init__() self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") ) self.errmsg = "Expected start of line" def preParse( self, instring, loc ): preloc = super(LineStart,self).preParse(instring,loc) if instring[preloc] == "\n": loc += 1 return loc def parseImpl( self, instring, loc, doActions=True ): if not( loc==0 or (loc == self.preParse( instring, 0 )) or (instring[loc-1] == "\n") ): #col(loc, instring) != 1: raise ParseException(instring, loc, self.errmsg, self) return loc, [] class LineEnd(_PositionToken): """Matches if current position is at the end of a line within the parse string""" def __init__( self ): super(LineEnd,self).__init__() self.setWhitespaceChars( ParserElement.DEFAULT_WHITE_CHARS.replace("\n","") ) self.errmsg = "Expected end of line" def parseImpl( self, instring, loc, doActions=True ): if loc len(instring): return loc, [] else: raise ParseException(instring, loc, self.errmsg, self) class WordStart(_PositionToken): """Matches if the current position is at the beginning of a Word, and is not preceded by any character in a given set of C{wordChars} (default=C{printables}). To emulate the C{\b} behavior of regular expressions, use C{WordStart(alphanums)}. C{WordStart} will also match at the beginning of the string being parsed, or at the beginning of a line. """ def __init__(self, wordChars = printables): super(WordStart,self).__init__() self.wordChars = set(wordChars) self.errmsg = "Not at the start of a word" def parseImpl(self, instring, loc, doActions=True ): if loc != 0: if (instring[loc-1] in self.wordChars or instring[loc] not in self.wordChars): raise ParseException(instring, loc, self.errmsg, self) return loc, [] class WordEnd(_PositionToken): """Matches if the current position is at the end of a Word, and is not followed by any character in a given set of C{wordChars} (default=C{printables}). To emulate the C{\b} behavior of regular expressions, use C{WordEnd(alphanums)}. C{WordEnd} will also match at the end of the string being parsed, or at the end of a line. """ def __init__(self, wordChars = printables): super(WordEnd,self).__init__() self.wordChars = set(wordChars) self.skipWhitespace = False self.errmsg = "Not at the end of a word" def parseImpl(self, instring, loc, doActions=True ): instrlen = len(instring) if instrlen>0 and loc maxExcLoc: maxException = err maxExcLoc = err.loc except IndexError: if len(instring) > maxExcLoc: maxException = ParseException(instring,len(instring),e.errmsg,self) maxExcLoc = len(instring) else: # save match among all matches, to retry longest to shortest matches.append((loc2, e)) if matches: matches.sort(key=lambda x: -x[0]) for _,e in matches: try: return e._parse( instring, loc, doActions ) except ParseException as err: err.__traceback__ = None if err.loc > maxExcLoc: maxException = err maxExcLoc = err.loc if maxException is not None: maxException.msg = self.errmsg raise maxException else: raise ParseException(instring, loc, "no defined alternatives to match", self) def __ixor__(self, other ): if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) return self.append( other ) #Or( [ self, other ] ) def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "{" + " ^ ".join(_ustr(e) for e in self.exprs) + "}" return self.strRepr def checkRecursion( self, parseElementList ): subRecCheckList = parseElementList[:] + [ self ] for e in self.exprs: e.checkRecursion( subRecCheckList ) class MatchFirst(ParseExpression): """Requires that at least one C{ParseExpression} is found. If two expressions match, the first one listed is the one that will match. May be constructed using the C{'|'} operator. """ def __init__( self, exprs, savelist = False ): super(MatchFirst,self).__init__(exprs, savelist) if self.exprs: self.mayReturnEmpty = any(e.mayReturnEmpty for e in self.exprs) else: self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): maxExcLoc = -1 maxException = None for e in self.exprs: try: ret = e._parse( instring, loc, doActions ) return ret except ParseException as err: if err.loc > maxExcLoc: maxException = err maxExcLoc = err.loc except IndexError: if len(instring) > maxExcLoc: maxException = ParseException(instring,len(instring),e.errmsg,self) maxExcLoc = len(instring) # only got here if no expression matched, raise exception for match that made it the furthest else: if maxException is not None: maxException.msg = self.errmsg raise maxException else: raise ParseException(instring, loc, "no defined alternatives to match", self) def __ior__(self, other ): if isinstance( other, basestring ): other = ParserElement._literalStringClass( other ) return self.append( other ) #MatchFirst( [ self, other ] ) def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "{" + " | ".join(_ustr(e) for e in self.exprs) + "}" return self.strRepr def checkRecursion( self, parseElementList ): subRecCheckList = parseElementList[:] + [ self ] for e in self.exprs: e.checkRecursion( subRecCheckList ) class Each(ParseExpression): """Requires all given C{ParseExpression}s to be found, but in any order. Expressions may be separated by whitespace. May be constructed using the C{'&'} operator. """ def __init__( self, exprs, savelist = True ): super(Each,self).__init__(exprs, savelist) self.mayReturnEmpty = all(e.mayReturnEmpty for e in self.exprs) self.skipWhitespace = True self.initExprGroups = True def parseImpl( self, instring, loc, doActions=True ): if self.initExprGroups: self.opt1map = dict((id(e.expr),e) for e in self.exprs if isinstance(e,Optional)) opt1 = [ e.expr for e in self.exprs if isinstance(e,Optional) ] opt2 = [ e for e in self.exprs if e.mayReturnEmpty and not isinstance(e,Optional)] self.optionals = opt1 + opt2 self.multioptionals = [ e.expr for e in self.exprs if isinstance(e,ZeroOrMore) ] self.multirequired = [ e.expr for e in self.exprs if isinstance(e,OneOrMore) ] self.required = [ e for e in self.exprs if not isinstance(e,(Optional,ZeroOrMore,OneOrMore)) ] self.required += self.multirequired self.initExprGroups = False tmpLoc = loc tmpReqd = self.required[:] tmpOpt = self.optionals[:] matchOrder = [] keepMatching = True while keepMatching: tmpExprs = tmpReqd + tmpOpt + self.multioptionals + self.multirequired failed = [] for e in tmpExprs: try: tmpLoc = e.tryParse( instring, tmpLoc ) except ParseException: failed.append(e) else: matchOrder.append(self.opt1map.get(id(e),e)) if e in tmpReqd: tmpReqd.remove(e) elif e in tmpOpt: tmpOpt.remove(e) if len(failed) == len(tmpExprs): keepMatching = False if tmpReqd: missing = ", ".join(_ustr(e) for e in tmpReqd) raise ParseException(instring,loc,"Missing one or more required elements (%s)" % missing ) # add any unmatched Optionals, in case they have default values defined matchOrder += [e for e in self.exprs if isinstance(e,Optional) and e.expr in tmpOpt] resultlist = [] for e in matchOrder: loc,results = e._parse(instring,loc,doActions) resultlist.append(results) finalResults = ParseResults() for r in resultlist: dups = {} for k in r.keys(): if k in finalResults: tmp = ParseResults(finalResults[k]) tmp += ParseResults(r[k]) dups[k] = tmp finalResults += ParseResults(r) for k,v in dups.items(): finalResults[k] = v return loc, finalResults def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "{" + " & ".join(_ustr(e) for e in self.exprs) + "}" return self.strRepr def checkRecursion( self, parseElementList ): subRecCheckList = parseElementList[:] + [ self ] for e in self.exprs: e.checkRecursion( subRecCheckList ) class ParseElementEnhance(ParserElement): """Abstract subclass of C{ParserElement}, for combining and post-processing parsed tokens.""" def __init__( self, expr, savelist=False ): super(ParseElementEnhance,self).__init__(savelist) if isinstance( expr, basestring ): expr = ParserElement._literalStringClass(expr) self.expr = expr self.strRepr = None if expr is not None: self.mayIndexError = expr.mayIndexError self.mayReturnEmpty = expr.mayReturnEmpty self.setWhitespaceChars( expr.whiteChars ) self.skipWhitespace = expr.skipWhitespace self.saveAsList = expr.saveAsList self.callPreparse = expr.callPreparse self.ignoreExprs.extend(expr.ignoreExprs) def parseImpl( self, instring, loc, doActions=True ): if self.expr is not None: return self.expr._parse( instring, loc, doActions, callPreParse=False ) else: raise ParseException("",loc,self.errmsg,self) def leaveWhitespace( self ): self.skipWhitespace = False self.expr = self.expr.copy() if self.expr is not None: self.expr.leaveWhitespace() return self def ignore( self, other ): if isinstance( other, Suppress ): if other not in self.ignoreExprs: super( ParseElementEnhance, self).ignore( other ) if self.expr is not None: self.expr.ignore( self.ignoreExprs[-1] ) else: super( ParseElementEnhance, self).ignore( other ) if self.expr is not None: self.expr.ignore( self.ignoreExprs[-1] ) return self def streamline( self ): super(ParseElementEnhance,self).streamline() if self.expr is not None: self.expr.streamline() return self def checkRecursion( self, parseElementList ): if self in parseElementList: raise RecursiveGrammarException( parseElementList+[self] ) subRecCheckList = parseElementList[:] + [ self ] if self.expr is not None: self.expr.checkRecursion( subRecCheckList ) def validate( self, validateTrace=[] ): tmp = validateTrace[:]+[self] if self.expr is not None: self.expr.validate(tmp) self.checkRecursion( [] ) def __str__( self ): try: return super(ParseElementEnhance,self).__str__() except: pass if self.strRepr is None and self.expr is not None: self.strRepr = "%s:(%s)" % ( self.__class__.__name__, _ustr(self.expr) ) return self.strRepr class FollowedBy(ParseElementEnhance): """Lookahead matching of the given parse expression. C{FollowedBy} does *not* advance the parsing position within the input string, it only verifies that the specified parse expression matches at the current position. C{FollowedBy} always returns a null token list.""" def __init__( self, expr ): super(FollowedBy,self).__init__(expr) self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): self.expr.tryParse( instring, loc ) return loc, [] class NotAny(ParseElementEnhance): """Lookahead to disallow matching with the given parse expression. C{NotAny} does *not* advance the parsing position within the input string, it only verifies that the specified parse expression does *not* match at the current position. Also, C{NotAny} does *not* skip over leading whitespace. C{NotAny} always returns a null token list. May be constructed using the '~' operator.""" def __init__( self, expr ): super(NotAny,self).__init__(expr) #~ self.leaveWhitespace() self.skipWhitespace = False # do NOT use self.leaveWhitespace(), don't want to propagate to exprs self.mayReturnEmpty = True self.errmsg = "Found unwanted token, "+_ustr(self.expr) def parseImpl( self, instring, loc, doActions=True ): if self.expr.canParseNext(instring, loc): raise ParseException(instring, loc, self.errmsg, self) 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 OneOrMore(ParseElementEnhance): """Repetition of one or more of the given expression. Parameters: - expr - expression that must match one or more times - stopOn - (default=None) - expression for a terminating sentinel (only required if the sentinel would ordinarily match the repetition expression) """ def __init__( self, expr, stopOn=None): super(OneOrMore, self).__init__(expr) ender = stopOn if isinstance(ender, basestring): ender = ParserElement._literalStringClass(ender) self.not_ender = ~ender if ender is not None else None def parseImpl( self, instring, loc, doActions=True ): self_expr_parse = self.expr._parse self_skip_ignorables = self._skipIgnorables check_ender = self.not_ender is not None if check_ender: try_not_ender = self.not_ender.tryParse # must be at least one (but first see if we are the stopOn sentinel; # if so, fail) if check_ender: try_not_ender(instring, loc) loc, tokens = self_expr_parse( instring, loc, doActions, callPreParse=False ) try: hasIgnoreExprs = (not not self.ignoreExprs) while 1: if check_ender: try_not_ender(instring, loc) if hasIgnoreExprs: preloc = self_skip_ignorables( instring, loc ) else: preloc = loc loc, tmptokens = self_expr_parse( instring, preloc, doActions ) if tmptokens or tmptokens.haskeys(): 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 ZeroOrMore(OneOrMore): """Optional repetition of zero or more of the given expression. Parameters: - expr - expression that must match zero or more times - stopOn - (default=None) - expression for a terminating sentinel (only required if the sentinel would ordinarily match the repetition expression) """ def __init__( self, expr, stopOn=None): super(ZeroOrMore,self).__init__(expr, stopOn=stopOn) self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): try: return super(ZeroOrMore, self).parseImpl(instring, loc, doActions) except (ParseException,IndexError): 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 _NullToken(object): def __bool__(self): return False __nonzero__ = __bool__ def __str__(self): return "" _optionalNotMatched = _NullToken() class Optional(ParseElementEnhance): """Optional matching of the given expression. Parameters: - expr - expression that must match zero or more times - default (optional) - value to be returned if the optional expression is not found. """ def __init__( self, expr, default=_optionalNotMatched ): super(Optional,self).__init__( expr, savelist=False ) self.defaultValue = default self.mayReturnEmpty = True def parseImpl( self, instring, loc, doActions=True ): try: loc, tokens = self.expr._parse( instring, loc, doActions, callPreParse=False ) except (ParseException,IndexError): if self.defaultValue is not _optionalNotMatched: if self.expr.resultsName: tokens = ParseResults([ self.defaultValue ]) tokens[self.expr.resultsName] = self.defaultValue else: tokens = [ self.defaultValue ] else: tokens = [] return loc, tokens def __str__( self ): if hasattr(self,"name"): return self.name if self.strRepr is None: self.strRepr = "[" + _ustr(self.expr) + "]" return self.strRepr class SkipTo(ParseElementEnhance): """Token for skipping over all undefined text until the matched expression is found. Parameters: - expr - target expression marking the end of the data to be skipped - include - (default=False) if True, the target expression is also parsed (the skipped text and target expression are returned as a 2-element list). - ignore - (default=None) used to define grammars (typically quoted strings and comments) that might contain false matches to the target expression - failOn - (default=None) define expressions that are not allowed to be included in the skipped test; if found before the target expression is found, the SkipTo is not a match """ def __init__( self, other, include=False, ignore=None, failOn=None ): super( SkipTo, self ).__init__( other ) self.ignoreExpr = ignore self.mayReturnEmpty = True self.mayIndexError = False self.includeMatch = include self.asList = False if isinstance(failOn, basestring): self.failOn = ParserElement._literalStringClass(failOn) else: self.failOn = failOn self.errmsg = "No match found for "+_ustr(self.expr) def parseImpl( self, instring, loc, doActions=True ): startloc = loc instrlen = len(instring) expr = self.expr expr_parse = self.expr._parse self_failOn_canParseNext = self.failOn.canParseNext if self.failOn is not None else None self_ignoreExpr_tryParse = self.ignoreExpr.tryParse if self.ignoreExpr is not None else None tmploc = loc while tmploc <= instrlen: if self_failOn_canParseNext is not None: # break if failOn expression matches if self_failOn_canParseNext(instring, tmploc): break if self_ignoreExpr_tryParse is not None: # advance past ignore expressions while 1: try: tmploc = self_ignoreExpr_tryParse(instring, tmploc) except ParseBaseException: break try: expr_parse(instring, tmploc, doActions=False, callPreParse=False) except (ParseException, IndexError): # no match, advance loc in string tmploc += 1 else: # matched skipto expr, done break else: # ran off the end of the input string without matching skipto expr, fail raise ParseException(instring, loc, self.errmsg, self) # build up return values loc = tmploc skiptext = instring[startloc:loc] skipresult = ParseResults(skiptext) if self.includeMatch: loc, mat = expr_parse(instring,loc,doActions,callPreParse=False) skipresult += mat return loc, skipresult class Forward(ParseElementEnhance): """Forward declaration of an expression to be defined later - used for recursive grammars, such as algebraic infix notation. When the expression is known, it is assigned to the C{Forward} variable using the '<<' operator. Note: take care when assigning to C{Forward} not to overlook precedence of operators. Specifically, '|' has a lower precedence than '<<', so that:: fwdExpr << a | b | c will actually be evaluated as:: (fwdExpr << a) | b | c thereby leaving b and c out as parseable alternatives. It is recommended that you explicitly group the values inserted into the C{Forward}:: fwdExpr << (a | b | c) Converting to use the '<<=' operator instead will avoid this problem. """ def __init__( self, other=None ): super(Forward,self).__init__( other, savelist=False ) def __lshift__( self, other ): if isinstance( other, basestring ): other = ParserElement._literalStringClass(other) self.expr = other self.strRepr = None self.mayIndexError = self.expr.mayIndexError self.mayReturnEmpty = self.expr.mayReturnEmpty self.setWhitespaceChars( self.expr.whiteChars ) self.skipWhitespace = self.expr.skipWhitespace self.saveAsList = self.expr.saveAsList self.ignoreExprs.extend(self.expr.ignoreExprs) return self def __ilshift__(self, other): return self << other 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 return self.__class__.__name__ + ": ..." # stubbed out for now - creates awful memory and perf issues self._revertClass = self.__class__ self.__class__ = _ForwardNoRecurse try: if self.expr is not None: retString = _ustr(self.expr) else: retString = "None" finally: self.__class__ = self._revertClass return self.__class__.__name__ + ": " + retString def copy(self): if self.expr is not None: return super(Forward,self).copy() else: ret = Forward() ret <<= self return ret class _ForwardNoRecurse(Forward): def __str__( self ): return "..." class TokenConverter(ParseElementEnhance): """Abstract subclass of C{ParseExpression}, for converting parsed results.""" def __init__( self, expr, savelist=False ): super(TokenConverter,self).__init__( expr )#, savelist ) self.saveAsList = False class Combine(TokenConverter): """Converter to concatenate all matching tokens to a single string. By default, the matching patterns must also be contiguous in the input string; this can be disabled by specifying C{'adjacent=False'} in the constructor. """ def __init__( self, expr, joinString="", adjacent=True ): super(Combine,self).__init__( expr ) # suppress whitespace-stripping in contained parse expressions, but re-enable it on the Combine itself if adjacent: self.leaveWhitespace() self.adjacent = adjacent self.skipWhitespace = True self.joinString = joinString self.callPreparse = True def ignore( self, other ): if self.adjacent: ParserElement.ignore(self, other) else: super( Combine, self).ignore( other ) return self def postParse( self, instring, loc, tokenlist ): retToks = tokenlist.copy() del retToks[:] retToks += ParseResults([ "".join(tokenlist._asStringList(self.joinString)) ], modal=self.modalResults) if self.resultsName and retToks.haskeys(): return [ retToks ] else: return retToks class Group(TokenConverter): """Converter to return the matched tokens as a list - useful for returning tokens of C{L{ZeroOrMore}} and C{L{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, expr ): super(Dict,self).__init__( expr ) self.saveAsList = True def postParse( self, instring, loc, tokenlist ): for i,tok in enumerate(tokenlist): if len(tok) == 0: continue ikey = tok[0] if isinstance(ikey,int): ikey = _ustr(tok[0]).strip() if len(tok)==1: tokenlist[ikey] = _ParseResultsWithOffset("",i) elif len(tok)==2 and not isinstance(tok[1],ParseResults): tokenlist[ikey] = _ParseResultsWithOffset(tok[1],i) else: dictvalue = tok.copy() #ParseResults(i) del dictvalue[0] if len(dictvalue)!= 1 or (isinstance(dictvalue,ParseResults) and dictvalue.haskeys()): tokenlist[ikey] = _ParseResultsWithOffset(dictvalue,i) else: tokenlist[ikey] = _ParseResultsWithOffset(dictvalue[0],i) if self.resultsName: return [ tokenlist ] else: return tokenlist class Suppress(TokenConverter): """Converter for ignoring the results of a parsed expression.""" def postParse( self, instring, loc, tokenlist ): return [] def suppress( self ): return self class OnlyOnce(object): """Wrapper for parse actions, to ensure they are only called once.""" def __init__(self, methodCall): self.callable = _trim_arity(methodCall) self.called = False def __call__(self,s,l,t): if not self.called: results = self.callable(s,l,t) self.called = True return results raise ParseException(s,l,"") def reset(self): self.called = False def traceParseAction(f): """Decorator for debugging parse actions.""" f = _trim_arity(f) def z(*paArgs): thisFunc = f.__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 as exc: sys.stderr.write( "<", "|".join( [ _escapeRegexChars(sym) for sym in symbols] )) try: if len(symbols)==len("".join(symbols)): return Regex( "[%s]" % "".join(_escapeRegexRangeChars(sym) for sym in symbols) ).setName(' | '.join(symbols)) else: return Regex( "|".join(re.escape(sym) for sym in symbols) ).setName(' | '.join(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).setName(' | '.join(symbols)) def dictOf( key, value ): """Helper to easily and clearly define a dictionary by specifying the respective patterns for the key and value. Takes care of defining the C{L{Dict}}, C{L{ZeroOrMore}}, and C{L{Group}} tokens in the proper order. The key pattern can include delimiting markers or punctuation, as long as they are suppressed, thereby leaving the significant key text. The value pattern can include named results, so that the C{Dict} results can include named token fields. """ return Dict( ZeroOrMore( Group ( key + value ) ) ) def originalTextFor(expr, asString=True): """Helper to return the original, untokenized text for a given expression. Useful to restore the parsed fields of an HTML start tag into the raw tag text itself, or to revert separate tokens with intervening whitespace back to the original matching input text. By default, returns astring containing the original parsed text. If the optional C{asString} argument is passed as C{False}, then the return value is a C{L{ParseResults}} containing any results names that were originally matched, and a single token containing the original matched text from the input string. So if the expression passed to C{L{originalTextFor}} contains expressions with defined results names, you must set C{asString} to C{False} if you want to preserve those results name values.""" locMarker = Empty().setParseAction(lambda s,loc,t: loc) endlocMarker = locMarker.copy() endlocMarker.callPreparse = False matchExpr = locMarker("_original_start") + expr + endlocMarker("_original_end") if asString: extractText = lambda s,l,t: s[t._original_start:t._original_end] else: def extractText(s,l,t): t[:] = [s[t.pop('_original_start'):t.pop('_original_end')]] matchExpr.setParseAction(extractText) matchExpr.ignoreExprs = expr.ignoreExprs return matchExpr def ungroup(expr): """Helper to undo pyparsing's default grouping of And expressions, even if all but one are non-empty.""" return TokenConverter(expr).setParseAction(lambda t:t[0]) def locatedExpr(expr): """Helper to decorate a returned token with its starting and ending locations in the input string. This helper adds the following results names: - locn_start = location where matched expression begins - locn_end = location where matched expression ends - value = the actual parsed results Be careful if the input text contains C{} characters, you may want to call C{L{ParserElement.parseWithTabs}} """ locator = Empty().setParseAction(lambda s,l,t: l) return Group(locator("locn_start") + expr("value") + locator.copy().leaveWhitespace()("locn_end")) # 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"\[]-*.$+^?()~ ", exact=2 ).setParseAction(lambda s,l,t:t[0][1]) _escapedHexChar = Regex(r"\\0?[xX][0-9a-fA-F]+").setParseAction(lambda s,l,t:unichr(int(t[0].lstrip(r'\0x'),16))) _escapedOctChar = Regex(r"\\0[0-7]+").setParseAction(lambda s,l,t:unichr(int(t[0][1:],8))) _singleChar = _escapedPunc | _escapedHexChar | _escapedOctChar | Word(printables, excludeChars=r'\]', exact=1) | Regex(r"\w", re.UNICODE) _charRange = Group(_singleChar + Suppress("-") + _singleChar) _reBracketExpr = Literal("[") + Optional("^").setResultsName("negate") + Group( OneOrMore( _charRange | _singleChar ) ).setResultsName("body") + "]" def srange(s): r"""Helper to easily define string ranges for use in Word construction. Borrows syntax from regexp '[]' string range definitions:: srange("[0-9]") -> "0123456789" srange("[a-z]") -> "abcdefghijklmnopqrstuvwxyz" srange("[a-z$_]") -> "abcdefghijklmnopqrstuvwxyz$_" The input string must be enclosed in []'s, and the returned string is the expanded character set joined into a single string. The values enclosed in the []'s may be:: a single character an escaped character with a leading backslash (such as \- or \]) an escaped hex character with a leading '\x' (\x21, which is a '!' character) (\0x## is also supported for backwards compatibility) an escaped octal character with a leading '\0' (\041, which is a '!' character) a range of any of the above, separated by a dash ('a-z', etc.) any combination of the above ('aeiouy', 'a-zA-Z0-9_$', etc.) """ _expanded = lambda p: p if not isinstance(p,ParseResults) else ''.join(unichr(c) for c in range(ord(p[0]),ord(p[1])+1)) try: return "".join(_expanded(part) for part in _reBracketExpr.parseString(s).body) except: return "" def matchOnlyAtCol(n): """Helper method for defining parse actions that require matching at a specific column in the input text. """ def verifyCol(strg,locn,toks): if col(locn,strg) != n: raise ParseException(strg,locn,"matched token not at column %d" % n) return verifyCol def replaceWith(replStr): """Helper method for common parse actions that simply return a literal value. Especially useful when used with C{L{transformString}()}. """ return lambda s,l,t: [replStr] 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 tokenMap(func, *args): """Helper to define a parse action by mapping a function to all elements of a ParseResults list.If any additional args are passed, they are forwarded to the given function as additional arguments after the token, as in C{hex_integer = Word(hexnums).setParseAction(tokenMap(int, 16))}, which will convert the parsed data to an integer using base 16. """ def pa(s,l,t): t[:] = [func(tokn, *args) for tokn in t] try: func_name = getattr(func, '__name__', getattr(func, '__class__').__name__) except Exception: func_name = str(func) pa.__name__ = func_name return pa upcaseTokens = tokenMap(lambda t: _ustr(t).upper()) """Helper parse action to convert tokens to upper case.""" downcaseTokens = tokenMap(lambda t: _ustr(t).lower()) """Helper parse action to convert tokens to lower case.""" def _makeTags(tagStr, xml): """Internal helper to construct opening and closing tag expressions, given a tag name""" if isinstance(tagStr,basestring): resname = tagStr tagStr = Keyword(tagStr, caseless=not xml) else: resname = tagStr.name tagAttrName = Word(alphas,alphanums+"_-:") if (xml): tagAttrValue = dblQuotedString.copy().setParseAction( removeQuotes ) openTag = Suppress("<") + tagStr("tag") + \ Dict(ZeroOrMore(Group( tagAttrName + Suppress("=") + tagAttrValue ))) + \ Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">") else: printablesLessRAbrack = "".join(c for c in printables if c not in ">") tagAttrValue = quotedString.copy().setParseAction( removeQuotes ) | Word(printablesLessRAbrack) openTag = Suppress("<") + tagStr("tag") + \ Dict(ZeroOrMore(Group( tagAttrName.setParseAction(downcaseTokens) + \ Optional( Suppress("=") + tagAttrValue ) ))) + \ Optional("/",default=[False]).setResultsName("empty").setParseAction(lambda s,l,t:t[0]=='/') + Suppress(">") closeTag = Combine(_L("") openTag = openTag.setResultsName("start"+"".join(resname.replace(":"," ").title().split())).setName("<%s>" % resname) closeTag = closeTag.setResultsName("end"+"".join(resname.replace(":"," ").title().split())).setName("" % resname) openTag.tag = resname closeTag.tag = resname return openTag, closeTag def makeHTMLTags(tagStr): """Helper to construct opening and closing tag expressions for HTML, given a tag name""" return _makeTags( tagStr, False ) def makeXMLTags(tagStr): """Helper to construct opening and closing tag expressions for XML, given a tag name""" return _makeTags( tagStr, True ) def withAttribute(*args,**attrDict): """Helper to create a validating parse action to be used with start tags created with C{L{makeXMLTags}} or C{L{makeHTMLTags}}. Use C{withAttribute} to qualify a starting tag with a required attribute value, to avoid false matches on common tags such as C{} or C{
}. Call C{withAttribute} with a series of attribute names and values. Specify the list of filter attributes names and values as: - keyword arguments, as in C{(align="right")}, or - as an explicit dict with C{**} operator, when an attribute name is also a Python reserved word, as in C{**{"class":"Customer", "align":"right"}} - a list of name-value tuples, as in ( ("ns1:class", "Customer"), ("ns2:align","right") ) For attribute names with a namespace prefix, you must use the second form. Attribute names are matched insensitive to upper/lower case. If just testing for C{class} (with or without a namespace), use C{L{withClass}}. To verify that the attribute exists, but without specifying a value, pass C{withAttribute.ANY_VALUE} as the value. """ if args: attrs = args[:] else: attrs = attrDict.items() attrs = [(k,v) for k,v in attrs] def pa(s,l,tokens): for attrName,attrValue in attrs: if attrName not in tokens: raise ParseException(s,l,"no matching attribute " + attrName) if attrValue != withAttribute.ANY_VALUE and tokens[attrName] != attrValue: raise ParseException(s,l,"attribute '%s' has value '%s', must be '%s'" % (attrName, tokens[attrName], attrValue)) return pa withAttribute.ANY_VALUE = object() def withClass(classname, namespace=''): """Simplified version of C{L{withAttribute}} when matching on a div class - made difficult because C{class} is a reserved word in Python. """ classattr = "%s:class" % namespace if namespace else "class" return withAttribute(**{classattr : classname}) opAssoc = _Constants() opAssoc.LEFT = object() opAssoc.RIGHT = object() def infixNotation( baseExpr, opList, lpar=Suppress('('), rpar=Suppress(')') ): """Helper method for constructing grammars of expressions made up of operators working in a precedence hierarchy. Operators may be unary or binary, left- or right-associative. Parse actions can also be attached to operator expressions. Parameters: - baseExpr - expression representing the most basic element for the nested - opList - list of tuples, one for each operator precedence level in the expression grammar; each tuple is of the form (opExpr, numTerms, rightLeftAssoc, parseAction), where: - opExpr is the pyparsing expression for the operator; may also be a string, which will be converted to a Literal; if numTerms is 3, opExpr is a tuple of two expressions, for the two operators separating the 3 terms - numTerms is the number of terms for this operator (must be 1, 2, or 3) - rightLeftAssoc is the indicator whether the operator is right or left associative, using the pyparsing-defined constants C{opAssoc.RIGHT} and C{opAssoc.LEFT}. - parseAction is the parse action to be associated with expressions matching this operator expression (the parse action tuple member may be omitted) - lpar - expression for matching left-parentheses (default=Suppress('(')) - rpar - expression for matching right-parentheses (default=Suppress(')')) """ ret = Forward() lastExpr = baseExpr | ( lpar + ret + rpar ) for i,operDef in enumerate(opList): opExpr,arity,rightLeftAssoc,pa = (operDef + (None,))[:4] termName = "%s term" % opExpr if arity < 3 else "%s%s term" % opExpr if arity == 3: if opExpr is None or len(opExpr) != 2: raise ValueError("if numterms=3, opExpr must be a tuple or list of two expressions") opExpr1, opExpr2 = opExpr thisExpr = Forward().setName(termName) if rightLeftAssoc == opAssoc.LEFT: if arity == 1: matchExpr = FollowedBy(lastExpr + opExpr) + Group( lastExpr + OneOrMore( opExpr ) ) elif arity == 2: if opExpr is not None: matchExpr = FollowedBy(lastExpr + opExpr + lastExpr) + Group( lastExpr + OneOrMore( opExpr + lastExpr ) ) else: matchExpr = FollowedBy(lastExpr+lastExpr) + Group( lastExpr + OneOrMore(lastExpr) ) elif arity == 3: matchExpr = FollowedBy(lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr) + \ Group( lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr ) else: raise ValueError("operator must be unary (1), binary (2), or ternary (3)") elif rightLeftAssoc == opAssoc.RIGHT: if arity == 1: # try to avoid LR with this extra test if not isinstance(opExpr, Optional): opExpr = Optional(opExpr) matchExpr = FollowedBy(opExpr.expr + thisExpr) + Group( opExpr + thisExpr ) elif arity == 2: if opExpr is not None: matchExpr = FollowedBy(lastExpr + opExpr + thisExpr) + Group( lastExpr + OneOrMore( opExpr + thisExpr ) ) else: matchExpr = FollowedBy(lastExpr + thisExpr) + Group( lastExpr + OneOrMore( thisExpr ) ) elif arity == 3: matchExpr = FollowedBy(lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr) + \ Group( lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr ) else: raise ValueError("operator must be unary (1), binary (2), or ternary (3)") else: raise ValueError("operator must indicate right or left associativity") if pa: matchExpr.setParseAction( pa ) thisExpr <<= ( matchExpr.setName(termName) | lastExpr ) lastExpr = thisExpr ret <<= lastExpr return ret operatorPrecedence = infixNotation """(Deprecated) Former name of C{L{infixNotation}}, will be dropped in a future release.""" dblQuotedString = Combine(Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*')+'"').setName("string enclosed in double quotes") sglQuotedString = Combine(Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*")+"'").setName("string enclosed in single quotes") quotedString = Combine(Regex(r'"(?:[^"\n\r\\]|(?:"")|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*')+'"'| Regex(r"'(?:[^'\n\r\\]|(?:'')|(?:\\(?:[^x]|x[0-9a-fA-F]+)))*")+"'").setName("quotedString using single or double quotes") unicodeString = Combine(_L('u') + quotedString.copy()).setName("unicode string literal") def nestedExpr(opener="(", closer=")", content=None, ignoreExpr=quotedString.copy()): """Helper method for defining nested lists enclosed in opening and closing delimiters ("(" and ")" are the default). Parameters: - opener - opening character for a nested list (default="("); can also be a pyparsing expression - closer - closing character for a nested list (default=")"); can also be a pyparsing expression - content - expression for items within the nested lists (default=None) - ignoreExpr - expression for ignoring opening and closing delimiters (default=quotedString) If an expression is not provided for the content argument, the nested expression will capture all whitespace-delimited content between delimiters as a list of separate values. Use the C{ignoreExpr} argument to define expressions that may contain opening or closing characters that should not be treated as opening or closing characters for nesting, such as quotedString or a comment expression. Specify multiple expressions using an C{L{Or}} or C{L{MatchFirst}}. The default is L{quotedString}, but if no expressions are to be ignored, then pass C{None} for this argument. """ if opener == closer: raise ValueError("opening and closing strings cannot be the same") if content is None: if isinstance(opener,basestring) and isinstance(closer,basestring): if len(opener) == 1 and len(closer)==1: if ignoreExpr is not None: content = (Combine(OneOrMore(~ignoreExpr + CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS,exact=1)) ).setParseAction(lambda t:t[0].strip())) else: content = (empty.copy()+CharsNotIn(opener+closer+ParserElement.DEFAULT_WHITE_CHARS ).setParseAction(lambda t:t[0].strip())) else: if ignoreExpr is not None: content = (Combine(OneOrMore(~ignoreExpr + ~Literal(opener) + ~Literal(closer) + CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1)) ).setParseAction(lambda t:t[0].strip())) else: content = (Combine(OneOrMore(~Literal(opener) + ~Literal(closer) + CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS,exact=1)) ).setParseAction(lambda t:t[0].strip())) else: raise ValueError("opening and closing arguments must be strings if no content expression is given") ret = Forward() if ignoreExpr is not None: ret <<= Group( Suppress(opener) + ZeroOrMore( ignoreExpr | ret | content ) + Suppress(closer) ) else: ret <<= Group( Suppress(opener) + ZeroOrMore( ret | content ) + Suppress(closer) ) ret.setName('nested %s%s expression' % (opener,closer)) return ret def indentedBlock(blockStatementExpr, indentStack, indent=True): """Helper method for defining space-delimited indentation blocks, such as those used to define block statements in Python source code. Parameters: - blockStatementExpr - expression defining syntax of statement that is repeated within the indented block - indentStack - list created by caller to manage indentation stack (multiple statementWithIndentedBlock expressions within a single grammar should share a common indentStack) - indent - boolean indicating whether block must be indented beyond the the current level; set to False for block of left-most statements (default=True) A valid block must contain at least one C{blockStatement}. """ def checkPeerIndent(s,l,t): if l >= len(s): return curCol = col(l,s) if curCol != indentStack[-1]: if curCol > indentStack[-1]: raise ParseFatalException(s,l,"illegal nesting") raise ParseException(s,l,"not a peer entry") def checkSubIndent(s,l,t): curCol = col(l,s) if curCol > indentStack[-1]: indentStack.append( curCol ) else: raise ParseException(s,l,"not a subentry") def checkUnindent(s,l,t): if l >= len(s): return curCol = col(l,s) if not(indentStack and curCol < indentStack[-1] and curCol <= indentStack[-2]): raise ParseException(s,l,"not an unindent") indentStack.pop() NL = OneOrMore(LineEnd().setWhitespaceChars("\t ").suppress()) INDENT = (Empty() + Empty().setParseAction(checkSubIndent)).setName('INDENT') PEER = Empty().setParseAction(checkPeerIndent).setName('') UNDENT = Empty().setParseAction(checkUnindent).setName('UNINDENT') if indent: smExpr = Group( Optional(NL) + #~ FollowedBy(blockStatementExpr) + INDENT + (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) + UNDENT) else: smExpr = Group( Optional(NL) + (OneOrMore( PEER + Group(blockStatementExpr) + Optional(NL) )) ) blockStatementExpr.ignore(_bslash + LineEnd()) return smExpr.setName('indented block') alphas8bit = srange(r"[\0xc0-\0xd6\0xd8-\0xf6\0xf8-\0xff]") punc8bit = srange(r"[\0xa1-\0xbf\0xd7\0xf7]") anyOpenTag,anyCloseTag = makeHTMLTags(Word(alphas,alphanums+"_:").setName('any tag')) _htmlEntityMap = dict(zip("gt lt amp nbsp quot apos".split(),'><& "\'')) commonHTMLEntity = Regex('&(?P' + '|'.join(_htmlEntityMap.keys()) +");").setName("common HTML entity") def replaceHTMLEntity(t): """Helper parser action to replace common HTML entities with their special characters""" return _htmlEntityMap.get(t.entity) # it's easy to get these comment structures wrong - they're very common, so may as well make them available cStyleComment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + '*/').setName("C style comment") "Comment of the form C{/* ... */}" htmlComment = Regex(r"").setName("HTML comment") "Comment of the form C{}" restOfLine = Regex(r".*").leaveWhitespace().setName("rest of line") dblSlashComment = Regex(r"//(?:\\\n|[^\n])*").setName("// comment") "Comment of the form C{// ... (to end of line)}" cppStyleComment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + '*/'| dblSlashComment).setName("C++ style comment") "Comment of either form C{L{cStyleComment}} or C{L{dblSlashComment}}" javaStyleComment = cppStyleComment "Same as C{L{cppStyleComment}}" pythonStyleComment = Regex(r"#.*").setName("Python style comment") "Comment of the form C{# ... (to end of line)}" _commasepitem = Combine(OneOrMore(Word(printables, excludeChars=',') + Optional( Word(" \t") + ~Literal(",") + ~LineEnd() ) ) ).streamline().setName("commaItem") commaSeparatedList = delimitedList( Optional( quotedString.copy() | _commasepitem, default="") ).setName("commaSeparatedList") """Predefined expression of 1 or more printable words or quoted strings, separated by commas.""" # some other useful expressions - using lower-case class name since we are really using this as a namespace class pyparsing_common: """ Here are some common low-level expressions that may be useful in jump-starting parser development: - numeric forms (L{integers}, L{reals}, L{scientific notation}) - common L{programming identifiers} - network addresses (L{MAC}, L{IPv4}, L{IPv6}) - ISO8601 L{dates} and L{datetime} - L{UUID} Parse actions: - C{L{convertToInteger}} - C{L{convertToFloat}} - C{L{convertToDate}} - C{L{convertToDatetime}} - C{L{stripHTMLTags}} """ convertToInteger = tokenMap(int) """ Parse action for converting parsed integers to Python int """ convertToFloat = tokenMap(float) """ Parse action for converting parsed numbers to Python float """ integer = Word(nums).setName("integer").setParseAction(convertToInteger) """expression that parses an unsigned integer, returns an int""" hex_integer = Word(hexnums).setName("hex integer").setParseAction(tokenMap(int,16)) """expression that parses a hexadecimal integer, returns an int""" signedInteger = Regex(r'[+-]?\d+').setName("signed integer").setParseAction(convertToInteger) """expression that parses an integer with optional leading sign, returns an int""" fraction = (signedInteger.addParseAction(convertToFloat) + '/' + signedInteger.addParseAction(convertToFloat)).setName("fraction") """fractional expression of an integer divided by an integer, returns a float""" fraction.addParseAction(lambda t: t[0]/t[-1]) mixed_integer = (fraction | integer + Optional(Optional('-').suppress() + fraction)).setName("fraction or mixed integer-fraction") """mixed integer of the form 'integer - fraction', with optional leading integer, returns float""" mixed_integer.addParseAction(sum) real = Regex(r'[+-]?\d+\.\d*').setName("real number").setParseAction(convertToFloat) """expression that parses a floating point number and returns a float""" sciReal = Regex(r'[+-]?\d+([eE][+-]?\d+|\.\d*([eE][+-]?\d+)?)').setName("real number with scientific notation").setParseAction(convertToFloat) """expression that parses a floating point number with optional scientific notation and returns a float""" # streamlining this expression makes the docs nicer-looking numeric = (sciReal | real | signedInteger).streamline() """any numeric expression, returns the corresponding Python type""" number = Regex(r'[+-]?\d+\.?\d*([eE][+-]?\d+)?').setName("number").setParseAction(convertToFloat) """any int or real number, returned as float""" identifier = Word(alphas+'_', alphanums+'_').setName("identifier") """typical code identifier (leading alpha or '_', followed by 0 or more alphas, nums, or '_')""" ipv4_address = Regex(r'(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})(\.(25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})){3}').setName("IPv4 address") "IPv4 address (C{0.0.0.0 - 255.255.255.255})" _ipv6_part = Regex(r'[0-9a-fA-F]{1,4}').setName("hex_integer") _full_ipv6_address = (_ipv6_part + (':' + _ipv6_part)*7).setName("full IPv6 address") _short_ipv6_address = (Optional(_ipv6_part + (':' + _ipv6_part)*(0,6)) + "::" + Optional(_ipv6_part + (':' + _ipv6_part)*(0,6))).setName("short IPv6 address") _short_ipv6_address.addCondition(lambda t: sum(1 for tt in t if pyparsing_common._ipv6_part.matches(tt)) < 8) _mixed_ipv6_address = ("::ffff:" + ipv4_address).setName("mixed IPv6 address") ipv6_address = Combine((_full_ipv6_address | _mixed_ipv6_address | _short_ipv6_address).setName("IPv6 address")).setName("IPv6 address") "IPv6 address (long, short, or mixed form)" mac_address = Regex(r'[0-9a-fA-F]{2}([:.-])[0-9a-fA-F]{2}(?:\1[0-9a-fA-F]{2}){4}').setName("MAC address") "MAC address xx:xx:xx:xx:xx (may also have '-' or '.' delimiters)" @staticmethod def convertToDate(fmt="%Y-%m-%d"): """ Helper to create a parse action for converting parsed date string to Python datetime.date Params - - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%d"}) """ return lambda s,l,t: datetime.strptime(t[0], fmt).date() @staticmethod def convertToDatetime(fmt="%Y-%m-%dT%H:%M:%S.%f"): """ Helper to create a parse action for converting parsed datetime string to Python datetime.datetime Params - - fmt - format to be passed to datetime.strptime (default=C{"%Y-%m-%dT%H:%M:%S.%f"}) """ return lambda s,l,t: datetime.strptime(t[0], fmt) iso8601_date = Regex(r'(?P\d{4})(?:-(?P\d\d)(?:-(?P\d\d))?)?').setName("ISO8601 date") "ISO8601 date (C{yyyy-mm-dd})" iso8601_datetime = Regex(r'(?P\d{4})-(?P\d\d)-(?P\d\d)[T ](?P\d\d):(?P\d\d)(:(?P\d\d(\.\d*)?)?)?(?PZ|[+-]\d\d:?\d\d)?').setName("ISO8601 datetime") "ISO8601 datetime (C{yyyy-mm-ddThh:mm:ss.s(Z|+-00:00)}) - trailing seconds, milliseconds, and timezone optional; accepts separating C{'T'} or C{' '}" uuid = Regex(r'[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}').setName("UUID") "UUID (C{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx})" _html_stripper = anyOpenTag.suppress() | anyCloseTag.suppress() @staticmethod def stripHTMLTags(s, l, tokens): """Parse action to remove HTML tags from web page HTML source""" return pyparsing_common._html_stripper.transformString(tokens[0]) if __name__ == "__main__": selectToken = CaselessLiteral("select") fromToken = CaselessLiteral("from") ident = Word(alphas, alphanums + "_$") columnName = delimitedList(ident, ".", combine=True).setParseAction(upcaseTokens) columnNameList = Group(delimitedList(columnName)).setName("columns") columnSpec = ('*' | columnNameList) tableName = delimitedList(ident, ".", combine=True).setParseAction(upcaseTokens) tableNameList = Group(delimitedList(tableName)).setName("tables") simpleSQL = selectToken("command") + columnSpec("columns") + fromToken + tableNameList("tables") # demo runTests method, including embedded comments in test string simpleSQL.runTests(""" # '*' as column list and dotted table name select * from SYS.XYZZY # caseless match on "SELECT", and casts back to "select" SELECT * from XYZZY, ABC # list of column names, and mixed case SELECT keyword Select AA,BB,CC from Sys.dual # multiple tables Select A, B, C from Sys.dual, Table2 # invalid SELECT keyword - should fail Xelect A, B, C from Sys.dual # incomplete command - should fail Select # invalid column name - should fail Select ^^^ frox Sys.dual """) pyparsing_common.numeric.runTests(""" 100 -100 +100 3.14159 6.02e23 1e-12 """) # any int or real number, returned as float pyparsing_common.number.runTests(""" 100 -100 +100 3.14159 6.02e23 1e-12 """) pyparsing_common.hex_integer.runTests(""" 100 FF """) import uuid pyparsing_common.uuid.setParseAction(tokenMap(uuid.UUID)) pyparsing_common.uuid.runTests(""" 12345678-1234-5678-1234-567812345678 """)