/*
 * Parsodus - A language agnostic parser generator
 * Copyright © 2016-2017 Thomas Avé, Robin Jadoul, Kobe Wullaert
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "generator.h"
#include "instruction.h"
#include <iostream>
#include <cstring>

namespace bf {

void Generator::run() {
	
	counter = 0;
	std::memset(array, 0, sizeof(array));
	while (!lbrackets.empty())
		lbrackets.pop();
	
	for (std::size_t instruct = 0; instruct < program.size(); instruct++) {

		switch(program[instruct]) {
		case Instruction::EMPTY: break;
		case Instruction::PLUS: 
			array[counter]++; 
			break;
		case Instruction::MINUS: 
			array[counter]--; 
			break;
		case Instruction::GREATER: 
			if (++counter == 30000) {
				std::cout << "Tried to access unavailable memory" << std::endl;
				return;
			} break;
		case Instruction::LESS:
			if (--counter == -1) {
				std::cout << "Tried to access unavailable memory" << std::endl;
				return;
			} break;
		case Instruction::POINT:
			std::cout << (char)array[counter];
			break;
		case Instruction::COMMA:
			char c;
			std::cin >> c; 
			array[counter] = (int)c;
			break;
		case Instruction::LBRACKET: 
			lbrackets.push(instruct);
			if (array[counter] == 0) 
				while (program[++instruct] != Instruction::RBRACKET) {}		
			break;
		case Instruction::RBRACKET: 
			if (array[counter] != 0)  
				instruct = lbrackets.top();
			else 
				lbrackets.pop();		
			break;
		default: // Won't happen
			break;
		}
	} 
}



} // namespace bf