#include <ctype.h>
#include <string.h>
#include <json.h>
#include "internal.h"

enum json_parse_result parse_literal(struct json **json_out, struct raw_json *raw) {
	enum json_parse_result ret = JSON_PARSE_OK;
	struct json *json = NULL;

	bool plus_one = raw->data[raw->index] == '+' || raw->data[raw->index] == '-';
	if (plus_one || isdigit(raw->data[raw->index])) {
		if (raw->data[raw->index] == '0' && isdigit(raw->data[raw->index + 1])) {
			ret = JSON_PARSE_INVALID_NUMBER_ERR;
			goto err;
		}
		const char *start = raw->data + raw->index + plus_one;
		char *end;
		/* is probably a number here, strtodl will tell */
		double num = strtod(start, &end);
		if (end == start) {
			ret = JSON_PARSE_INVALID_NUMBER_ERR;
			goto err;
		}
		if (raw->data[raw->index] == '-')
			num = -num;
		json = json_number(num);
		raw->index = end - raw->data;
	} else {
		size_t end_index;
		for (end_index = raw->index; end_index < raw->size; end_index++) {
			if (!isalpha(raw->data[end_index])) {
				break;
			}
		}
		size_t len = end_index - raw->index;
		if (len == 4 && strncmp(raw->data + raw->index, "true", len) == 0) {
			json = json_bool(true);
		} else if (len == 5 && strncmp(raw->data + raw->index, "false", len) == 0) {
			json = json_bool(false);
		} else if (len == 4 && strncmp(raw->data + raw->index, "null", len) == 0) {
			json = json_new();
		} else {
			ret = JSON_PARSE_INVALID_TOKEN_ERR;
		}
		raw->index = end_index;
	}

	if (!json)
		return JSON_OOM;

	*json_out = json;
	goto end;
err:
	json_delete(json);
end:
	return ret;
}