def __init__(self,
grammarFile,
startSym=None,
lastStart=False,
quiet=True,
deferLinkage=False):
self.quiet = quiet
self.rules = None
self.ruleDict = None
self.start = None
self.externalDependencies = []
self._externalRuleDicts = {}
self._deferLinkage = deferLinkage
self._linkageDone = False
self._additionalTokenTypes = TokenizerTypeList()
full_text = ""
with open(grammarFile) as FILE:
for line in FILE:
full_text += line
fullTokenizer = Tokenizer()
fullTokenizer.tokenize(full_text)
splitToken = Token(';', fullTokenizer.getTTL()['End'])
if not fullTokenizer.getLastToken() == splitToken:
raise GrammarParsingError(
"Found Text after last rule! Did you forget ';'?")
ruleTokenizers = fullTokenizer.splitTokensOn(splitToken)
try:
self.rules = []
for i, tokens in enumerate(ruleTokenizers):
if not self.quiet:
print("PARSING RULE:", i)
nextRule = Rule(tokens)
if nextRule.hasDependency():
dependency = nextRule.getDependency()
if dependency not in self.externalDependencies:
self.externalDependencies.append(dependency)
if nextRule.isRegExRule():
self._additionalTokenTypes.addTokenType(
nextRule.getRegExTT())
self.rules.append(nextRule)
except GrammarError as err:
print("Exception thrown while parsing rule", i)
print(err.message)
raise err
except Exception as err:
print("Unknown Exception thrown while parsing rule", i)
raise err
self.ruleDict = {r.lhs().getValue(): r for r in self.rules}
if not self._deferLinkage:
self.linkRules()
if startSym == None:
index = 0
# set last rule as start instead of first
if lastStart:
index = -1
self.start = self.rules[index].lhs().getValue()
else:
self.setStart(startSym)
