#include "repl.h"

#include <stdio.h>

void init_repl(repl_t *repl)
{
	init_memory_pool(&repl->pool);
}

bool step_repl(repl_t *repl)
{
	int len;
	for (len = 0; len < REPL_LINE_BUFFER_SIZE; ++len) {
		const int byte = repl->get_byte();
		if (EOF == byte)
			return false;
		else if ('\n' == byte)
			break;
		repl->line_buffer[len] = (char)byte;
	}
	const expression_t *e = repl->read(&repl->pool, repl->line_buffer, len);
	const int result = repl->evaluate(e);
	const int result_len = snprintf(
	    repl->result_buffer, REPL_RESULT_BUFFER_SIZE, "%d\n", result);
	repl->print(repl->result_buffer, result_len);

	return true;
}

void run_repl(repl_t *repl)
{
	while (step_repl(repl))
		;
}