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Parser works! Parses LR(0) grammers. Fixed the never ACCEPT bug from last night.

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Nathan Braswell
2013-05-30 02:12:34 -04:00
parent 69713ffe1a
commit dd7b255520
1 changed files with 11 additions and 1 deletions
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12
src/Parser.cpp
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@@ -171,14 +171,22 @@ int Parser::gotoTable(int state, Symbol* token) {
ParseAction* Parser::actionTable(int state, Symbol* token) {
std::vector<ParseRule*>* allStateRules = stateSets[state]->getTotal();
ParseRule* currentRule;
//Get the completed Goal rule for comparision to see if we need to accept
ParseRule* completedGoal = stateSets[0]->basis[0]->clone();
while (completedGoal->advancePointer()) {}
for (std::vector<ParseRule*>::size_type i = 0; i < allStateRules->size(); i++) {
currentRule = (*allStateRules)[i];
//If the current rule in the state is completed, then do a reduce action
if (currentRule->isAtEnd()) {
if (*currentRule == *(stateSets[0]->basis[0]))
//But first, if our advanced rule is equal to the completedGoal, we accept
if (*currentRule == *completedGoal)
return new ParseAction(ParseAction::ACCEPT);
return new ParseAction(ParseAction::REDUCE, currentRule);
}
//If the current rule in the state is not completed, see if it has the next correct token
std::cout << currentRule->getAtNextIndex()->toString() << " comp to " << token->toString() << std::endl;
if ( *(currentRule->getAtNextIndex()) == *token){
@@ -186,6 +194,7 @@ ParseAction* Parser::actionTable(int state, Symbol* token) {
//Goes to n^2 here, really need that table
ParseRule* advancedCurrent = currentRule->clone();
advancedCurrent->advancePointer();
for (std::vector<State*>::size_type j = 0; j < stateSets.size(); j++) {
for (std::vector<ParseRule*>::size_type k = 0; k < stateSets[j]->basis.size(); k++ ) {
if ( *(stateSets[j]->basis[k]) == *advancedCurrent)
@@ -193,6 +202,7 @@ ParseAction* Parser::actionTable(int state, Symbol* token) {
}
}
}
}
return new ParseAction(ParseAction::REJECT);
}