RNGLR Recognizer now works for grammers without null rules.

include/ParseRule.h

@@ -33,6 +33,8 @@ class ParseRule {
 		int getRightSize();
 		int getIndex();
 
+		std::vector<NodeTree<Symbol*>*>* nullReductions();
+
 		bool advancePointer();
 		bool isAtEnd();
 

include/RNGLRParser.h

@@ -10,6 +10,7 @@ class RNGLRParser: public Parser {
 		NodeTree<Symbol*>* parseInput(std::string inputString);
 		void reducer(int i);
 		void shifter(int i);
+		void addStates(std::vector< State* >* stateSets, State* state);
 	private:
 		std::vector<Symbol*> input;
 		GraphStructuredStack gss;

include/Table.h

@@ -13,6 +13,7 @@ class Table {
 		~Table();
 		void setSymbols(Symbol* EOFSymbol, Symbol* nullSymbol);
 		void add(int stateNum, Symbol* tranSymbol, ParseAction* action);
+		void remove(int stateNum, Symbol* tranSymbol);
 		std::vector<ParseAction*>* get(int state, Symbol* token);
 		ParseAction* getShift(int state, Symbol* token);
 		std::string toString();

src/GraphStructuredStack.cpp

@@ -78,7 +78,7 @@ bool GraphStructuredStack::hasEdge(NodeTree<int>* start, NodeTree<int>* end) {
 
 void GraphStructuredStack::addEdge(NodeTree<int>* start, NodeTree<int>* end) {
 	start->addChild(end);
-	end->addChild(start);
+	end->addParent(start);
 }
 
 std::string GraphStructuredStack::toString() {

src/ParseRule.cpp

@@ -73,6 +73,10 @@ int ParseRule::getIndex() {
 	return pointerIndex;
 }
 
+std::vector<NodeTree<Symbol*>*>* ParseRule::nullReductions() {
+	//Return a vector of null reduction trees
+}
+
 bool ParseRule::advancePointer() {
 	if (pointerIndex < rightSide.size()) {
 		pointerIndex++;

src/Parser.cpp

@@ -143,6 +143,7 @@ void Parser::createStateSet() {
 		//Add the new states
 		addStates(&stateSets, stateSets[i]);
 	}
+	table.remove(1, EOFSymbol);
 }
 
 int Parser::stateNum(State* state) {

src/RNGLRParser.cpp

@@ -168,3 +168,76 @@ void RNGLRParser::shifter(int i) {
 		toShift = nextShifts;
 	}
 }
+
+//Have to use own add states function in order to construct RN table instead of LALR table
+void RNGLRParser::addStates(std::vector< State* >* stateSets, State* state) {
+	std::cout << "RNGLR ADD STATES" << std::endl;
+	std::vector< State* > newStates;
+	//For each rule in the state we already have
+	std::vector<ParseRule*>* currStateTotal = state->getTotal();
+	for (std::vector<ParseRule*>::size_type i = 0; i < currStateTotal->size(); i++) {
+		//Clone the current rule
+		ParseRule* advancedRule = (*currStateTotal)[i]->clone();
+		//Try to advance the pointer, if sucessful see if it is the correct next symbol
+		if (advancedRule->advancePointer()) { 
+			//Technically, it should be the set of rules sharing this symbol advanced past in the basis for new state
+
+			//So search our new states to see if any of them use this advanced symbol as a base.
+			//If so, add this rule to them.
+			//If not, create it.
+			bool symbolAlreadyInState = false;
+			for (std::vector< State* >::size_type j = 0; j < newStates.size(); j++) {
+				if (*(newStates[j]->basis[0]->getAtIndex()) == *(advancedRule->getAtIndex())) {
+					symbolAlreadyInState = true;
+					//So now check to see if this exact rule is in this state
+					if (!newStates[j]->containsRule(advancedRule))
+						newStates[j]->basis.push_back(advancedRule);
+					//We found a state with the same symbol, so stop searching
+					break;
+				}
+			}
+			if (!symbolAlreadyInState) {
+				State* newState = new State(stateSets->size()+newStates.size(),advancedRule, state);
+				newStates.push_back(newState);
+			}
+		}
+		//Also add any completed rules as reduces in the action table
+		//See if reduce
+		//Also, this really only needs to be done for the state's basis, but we're already iterating through, so...
+		std::vector<Symbol*>* lookahead = (*currStateTotal)[i]->getLookahead();
+		if ((*currStateTotal)[i]->isAtEnd()) {
+			for (std::vector<Symbol*>::size_type j = 0; j < lookahead->size(); j++)
+				table.add(stateNum(state), (*lookahead)[j], new ParseAction(ParseAction::REDUCE, (*currStateTotal)[i]));
+		// } else if (*((*currStateTotal)[i]->getAtNextIndex()) == *nullSymbol) {
+		//If this has an appropriate ruduction to null, get the reduce trees out
+		} else if (std::vector<NodeTree<Symbol*>*>* reduceTrees = (*currStateTotal)[i]->nullReductions(), reduceTrees) {
+			std::cout << "REDUCE TREES" << std::endl;
+			//If is a rule that produces only NULL, add in the approprite reduction, but use a new rule with a right side of length 0. (so we don't pop off stack)
+			ParseRule* nullRule = (*currStateTotal)[i]->clone();
+			nullRule->setRightSide(* new std::vector<Symbol*>());
+			for (std::vector<Symbol*>::size_type j = 0; j < lookahead->size(); j++)
+				table.add(stateNum(state), (*lookahead)[j], new ParseAction(ParseAction::REDUCE, nullRule));
+		}
+	}
+	//Put all our new states in the set of states only if they're not already there.
+	bool stateAlreadyInAllStates = false;
+	Symbol* currStateSymbol;
+	for (std::vector< State * >::size_type i = 0; i < newStates.size(); i++) {
+		stateAlreadyInAllStates = false;
+		currStateSymbol = (*(newStates[i]->getBasis()))[0]->getAtIndex();
+		for (std::vector< State * >::size_type j = 0; j < stateSets->size(); j++) {
+			if (newStates[i]->basisEquals(*((*stateSets)[j]))) {
+				stateAlreadyInAllStates = true;
+				//If it does exist, we should add it as the shift/goto in the action table
+				(*stateSets)[j]->addParents(newStates[i]->getParents());
+				table.add(stateNum(state), currStateSymbol, new ParseAction(ParseAction::SHIFT, j));
+				break;
+			}
+		}
+		if (!stateAlreadyInAllStates) {
+			//If the state does not already exist, add it and add it as the shift/goto in the action table
+			stateSets->push_back(newStates[i]);
+			table.add(stateNum(state), currStateSymbol, new ParseAction(ParseAction::SHIFT, stateSets->size()-1));
+		}
+	}
+}

src/Table.cpp

@@ -71,6 +71,19 @@ void Table::add(int stateNum, Symbol* tranSymbol, ParseAction* action) {
 	}
 }
 
+void Table::remove(int stateNum, Symbol* tranSymbol) {
+	//find out what index this symbol is on
+	int symbolIndex = -1;
+	for (std::vector<Symbol*>::size_type i = 0; i < symbolIndexVec.size(); i++) {
+		if ( *(symbolIndexVec[i]) == *tranSymbol ) {
+			//Has been found
+			symbolIndex = i;
+			break;
+		}
+	}
+	(*(table[stateNum]))[symbolIndex] = NULL;
+}
+
 std::vector<ParseAction*>* Table::get(int state, Symbol* token) {
 	int symbolIndex = -1;
 	for (std::vector<Symbol*>::size_type i = 0; i < symbolIndexVec.size(); i++) {