#ifndef PARSERULE_H
#define PARSERULE_H

#ifndef NULL
#define NULL ((void*)0)
#endif

#include "Symbol.h"

#include <vector>
#include <string>
#include <iostream>

class ParseRule {
	public:
		ParseRule();
		ParseRule(Symbol leftHandle, int pointerIndex, std::vector<Symbol> &rightSide, std::vector<Symbol>* lookahead);
		~ParseRule();
		const bool equalsExceptLookahead(const ParseRule &other) const;
		bool const operator==(const ParseRule &other) const;
		bool const operator!=(const ParseRule &other) const;
        bool const operator<(const ParseRule &other) const; //Used for ordering so we can put ParseRule's in sets, and also so that ParseActions will have an ordering
		ParseRule* clone();

		void setLeftHandle(Symbol leftHandle);
		void appendToRight(Symbol appendee);

		Symbol getLeftSide();
		void setRightSide(std::vector<Symbol> rightSide);
		std::vector<Symbol> getRightSide();
		Symbol getAtNextIndex();
		Symbol getAtIndex();
		int getRightSize();
		int getIndex();

		bool advancePointer();
		bool isAtEnd();

		void setLookahead(std::vector<Symbol>* lookahead);
		void addLookahead(std::vector<Symbol>* lookahead);
		std::vector<Symbol>* getLookahead();

		std::string toString(bool printLookahead = true);
		std::string toDOT();

	private:
		int pointerIndex;
		Symbol leftHandle;
		std::vector<Symbol>* lookahead;
		std::vector<Symbol> rightSide;

};

#endif