exstack/dist/router/trie-tree/utils.js

A utility library designed to simplify and enhance Express.js applications.

//#region src/router/trie-tree/utils.ts
const patternCache = {};
const getPattern = (label, next) => {
	if (label === "*") return "*";
	const match = label.match(/^\:([^\{\}]+)(?:\{(.+)\})?$/);
	if (match) {
		const cacheKey = `${label}#${next}`;
		if (!patternCache[cacheKey]) if (match[2]) patternCache[cacheKey] = next && next[0] !== ":" && next[0] !== "*" ? [
			cacheKey,
			match[1],
			/* @__PURE__ */ new RegExp(`^${match[2]}(?=/${next})`)
		] : [
			label,
			match[1],
			/* @__PURE__ */ new RegExp(`^${match[2]}$`)
		];
		else patternCache[cacheKey] = [
			label,
			match[1],
			true
		];
		return patternCache[cacheKey];
	}
	return null;
};
const extractGroupsFromPath = (path) => {
	const groups = [];
	path = path.replace(/\{[^}]+\}/g, (match, index) => {
		const mark = `@${index}`;
		groups.push([mark, match]);
		return mark;
	});
	return {
		groups,
		path
	};
};
const splitRoutingPath = (routePath) => {
	const { groups, path } = extractGroupsFromPath(routePath);
	const paths = splitPath(path);
	return replaceGroupMarks(paths, groups);
};
const replaceGroupMarks = (paths, groups) => {
	for (let i = groups.length - 1; i >= 0; i--) {
		const [mark] = groups[i];
		for (let j = paths.length - 1; j >= 0; j--) if (paths[j].includes(mark)) {
			paths[j] = paths[j].replace(mark, groups[i][1]);
			break;
		}
	}
	return paths;
};
const splitPath = (path) => {
	const paths = path.split("/");
	if (paths[0] === "") paths.shift();
	return paths;
};
const checkOptionalParameter = (path) => {
	if (path.charCodeAt(path.length - 1) !== 63 || !path.includes(":")) return null;
	const segments = path.split("/");
	const results = [];
	let basePath = "";
	segments.forEach((segment) => {
		if (segment !== "" && !/\:/.test(segment)) basePath += "/" + segment;
		else if (/\:/.test(segment)) if (/\?/.test(segment)) {
			if (results.length === 0 && basePath === "") results.push("/");
			else results.push(basePath);
			const optionalSegment = segment.replace("?", "");
			basePath += "/" + optionalSegment;
			results.push(basePath);
		} else basePath += "/" + segment;
	});
	return results.filter((v, i, a) => a.indexOf(v) === i);
};

//#endregion
export { checkOptionalParameter, getPattern, splitPath, splitRoutingPath };