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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
/** @typedef {import("./Resolver").FileSystem} FileSystem */
/** @typedef {{ paths: string[], segments: string[] }} GetPathsResult */
/**
* Walk `path` from tip to root, returning every ancestor directory (plus the
* input itself) in `paths`, and each corresponding segment name in `segments`.
*
* The return value may be shared across callers via `getPathsCached` — treat
* it as read-only. Callers that need to mutate (currently only
* `SymlinkPlugin`) should `slice()` the arrays locally before writing.
* @param {string} path path
* @returns {GetPathsResult} paths and segments
*/
function getPaths(path) {
if (path === "/") return { paths: ["/"], segments: [""] };
const parts = path.split(/(.*?[\\/]+)/);
const paths = [path];
const segments = [parts[parts.length - 1]];
let part = parts[parts.length - 1];
path = path.slice(0, Math.max(0, path.length - part.length - 1));
for (let i = parts.length - 2; i > 2; i -= 2) {
paths.push(path);
part = parts[i];
path = path.slice(0, Math.max(0, path.length - part.length)) || "/";
segments.push(part.slice(0, -1));
}
[, part] = parts;
segments.push(part);
paths.push(part);
return {
paths,
segments,
};
}
/**
* Per-filesystem memoization of `getPaths`. Kept in a standalone WeakMap
* rather than being hung off `resolver.pathCache` so that adding this cache
* does not change the hidden-class shape of `pathCache` — which is accessed
* on the hot path of every resolve as `resolver.pathCache.{join,dirname,
* basename}.fn(...)`. CodSpeed caught that shape change as a ~1–2%
* instruction-count regression on `cache-predicate`, so we keep pathCache
* shape-stable by owning this cache here instead.
*
* The cache lifetime is tied to the filesystem object (same invariant as
* `_pathCacheByFs` in `Resolver.js`): when the user swaps filesystems the
* entries become unreachable and get collected.
* @type {WeakMap<FileSystem, Map<string, GetPathsResult>>}
*/
const _getPathsCacheByFs = new WeakMap();
/**
* Memoized `getPaths`. The returned object is shared across callers — do
* not mutate the `paths` or `segments` arrays in-place; `slice()` first if
* you need a mutable copy.
* @param {FileSystem} fileSystem filesystem used as the cache namespace
* @param {string} path path
* @returns {GetPathsResult} paths and segments
*/
function getPathsCached(fileSystem, path) {
let cache = _getPathsCacheByFs.get(fileSystem);
if (cache === undefined) {
cache = new Map();
_getPathsCacheByFs.set(fileSystem, cache);
} else {
const cached = cache.get(path);
if (cached !== undefined) return cached;
}
const result = getPaths(path);
cache.set(path, result);
return result;
}
module.exports = getPaths;
module.exports.getPathsCached = getPathsCached;