#ifndef _PARSER_H
#define _PARSER_H

// 'parser.h' roughly corresponds to the 'Parser' module specified in
// nand2tetris, with a few liberties taken.

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define DBGLOG   printf
//#define DBGLOG(...)
#define MAX_LINE_LEN    256  // TODO need to be redefined here? (remove me)

enum vm_command_t {
	C_ARITHMETIC,
	C_PUSH,
	C_POP,
	C_LABEL,
	C_GOTO,
	C_IF,
	C_FUNCTION,
	C_RETURN,
	C_CALL
};

struct vm_instruction_t {
	enum vm_command_t cmd;
	char *arg1;
	uint16_t arg2;
	const char *original_vm_line;
};


bool parse_command_type(struct vm_instruction_t *vm_instr) {
	return true; // STUB TODO implement
}

bool parse_arg1(struct vm_instruction_t *vm_instr) {
	return true; // STUB TODO implement
}

bool parse_arg2(struct vm_instruction_t *vm_instr) {
	return true; // STUB TODO implement
}

bool parse_line(const char *line, struct vm_instruction_t *vm_instr)
{
	vm_instr->original_vm_line = line;
	DBGLOG("// %s\n", vm_instr->original_vm_line);
	if (!parse_command_type(vm_instr))
		return false;
	if (!parse_arg1(vm_instr))
		return false;
	if (!parse_arg2(vm_instr))
		return false;
	return true;
}

#endif // _PARSER_H