class Parser(object):
def __init__(self,
grammarFile,
startIdentifier=None,
dependentGrammarFiles=None):
self.alphabet = None
self.ttl = None
self.grammar = Grammar(grammarFile,
startSym=startIdentifier,
deferLinkage=True)
if self.grammar.hasDependencies():
manageDependencies(self.grammar, grammarFileToName(grammarFile),
dependentGrammarFiles)
else:
self.grammar.setExternalRuleDicts({})
self.grammar.linkRules()
if not self.grammar.hasLinked():
raise GrammarLinkError("Grammar was never linked. Aborting.")
self.setGrammarAlphabet()
def setTTL(self, ttl):
self.ttl = ttl
def setAlphabet(self, alphabet):
self.alphabet = alphabet
self.ttl = getTTLForAlphabet(self.alphabet)
def setGrammarAlphabet(self):
self.alphabet = self.grammar.getAlphabet()
alphabetTTL = getTTLForAlphabet(self.alphabet)
if self.grammar.hasRegExTTs():
self.ttl = self.grammar.getRegExTTs()
self.ttl.extendWith(alphabetTTL)
else:
self.ttl = alphabetTTL
def setRuleTransform(self, ruleName, f):
self.grammar.setRuleTransformer(ruleName, f)
def getGrammar(self):
return self.grammar
def checkFile(self, objFile, ignoreWS=False, debug=False):
return bool(self.parseFile(objFile, ignoreWS, debug))
def parseFile(self, objFile, ignoreWS=False, debug=False):
raw = ''
with open(objFile) as FILE:
for line in FILE:
raw += line
return self.parseRaw(raw, ignoreWS, debug)
def checkRaw(self, raw, ignoreWS=False, debug=False):
return bool(self.parseRaw(raw, ignoreWS, debug))
def parseRaw(self, raw, ignoreWS=False, debug=False):
tokens = Tokenizer(self.ttl, ignoreWS)
tokens.tokenize(raw)
obj = self.grammar.tryMatch(tokens, debug)
if obj:
return obj.getArgs()
else:
return obj.getError()
