#include "reader.h"

#include <ctype.h>
#include <stddef.h>

const expression_t *
read_expression(memory_pool_t *pool, const char *input, int len)
{
	expression_t *result = allocate_expression(pool);
	if (NULL == result)
		return NULL;
	result->is_number = true;
	result->number = 0;
	while (isdigit(*input)) {
		result->number *= 10;
		result->number += *input - '0';
		++input;
		++len;
	}
	return result;
}