338 lines
9.6 KiB
JavaScript
338 lines
9.6 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const path = require("path");
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const WINDOWS_ABS_PATH_REGEXP = /^[a-zA-Z]:[\\/]/;
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const SEGMENTS_SPLIT_REGEXP = /([|!])/;
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const WINDOWS_PATH_SEPARATOR_REGEXP = /\\/g;
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/**
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* @typedef {Object} MakeRelativePathsCache
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* @property {Map<string, Map<string, string>>=} relativePaths
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*/
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/**
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* @param {string} context context for relative path
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* @param {string} maybeAbsolutePath path to make relative
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* @returns {string} relative path in request style
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*/
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const absoluteToRequest = (context, maybeAbsolutePath) => {
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if (maybeAbsolutePath[0] === "/") {
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if (
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maybeAbsolutePath.length > 1 &&
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maybeAbsolutePath[maybeAbsolutePath.length - 1] === "/"
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) {
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// this 'path' is actually a regexp generated by dynamic requires.
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// Don't treat it as an absolute path.
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return maybeAbsolutePath;
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}
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const querySplitPos = maybeAbsolutePath.indexOf("?");
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let resource =
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querySplitPos === -1
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? maybeAbsolutePath
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: maybeAbsolutePath.slice(0, querySplitPos);
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resource = path.posix.relative(context, resource);
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if (!resource.startsWith("../")) {
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resource = "./" + resource;
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}
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return querySplitPos === -1
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? resource
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: resource + maybeAbsolutePath.slice(querySplitPos);
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}
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if (WINDOWS_ABS_PATH_REGEXP.test(maybeAbsolutePath)) {
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const querySplitPos = maybeAbsolutePath.indexOf("?");
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let resource =
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querySplitPos === -1
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? maybeAbsolutePath
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: maybeAbsolutePath.slice(0, querySplitPos);
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resource = path.win32.relative(context, resource);
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if (!WINDOWS_ABS_PATH_REGEXP.test(resource)) {
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resource = resource.replace(WINDOWS_PATH_SEPARATOR_REGEXP, "/");
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if (!resource.startsWith("../")) {
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resource = "./" + resource;
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}
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}
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return querySplitPos === -1
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? resource
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: resource + maybeAbsolutePath.slice(querySplitPos);
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}
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// not an absolute path
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return maybeAbsolutePath;
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};
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/**
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* @param {string} context context for relative path
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* @param {string} relativePath path
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* @returns {string} absolute path
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*/
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const requestToAbsolute = (context, relativePath) => {
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if (relativePath.startsWith("./") || relativePath.startsWith("../"))
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return path.join(context, relativePath);
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return relativePath;
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};
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const makeCacheable = fn => {
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/** @type {WeakMap<object, Map<string, Map<string, string>>>} */
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const cache = new WeakMap();
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/**
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* @param {string} context context used to create relative path
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* @param {string} identifier identifier used to create relative path
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* @param {Object=} associatedObjectForCache an object to which the cache will be attached
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* @returns {string} the returned relative path
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*/
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const cachedFn = (context, identifier, associatedObjectForCache) => {
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if (!associatedObjectForCache) return fn(context, identifier);
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let innerCache = cache.get(associatedObjectForCache);
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if (innerCache === undefined) {
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innerCache = new Map();
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cache.set(associatedObjectForCache, innerCache);
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}
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let cachedResult;
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let innerSubCache = innerCache.get(context);
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if (innerSubCache === undefined) {
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innerCache.set(context, (innerSubCache = new Map()));
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} else {
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cachedResult = innerSubCache.get(identifier);
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}
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if (cachedResult !== undefined) {
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return cachedResult;
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} else {
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const result = fn(context, identifier);
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innerSubCache.set(identifier, result);
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return result;
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}
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};
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/**
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* @param {Object=} associatedObjectForCache an object to which the cache will be attached
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* @returns {function(string, string): string} cached function
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*/
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cachedFn.bindCache = associatedObjectForCache => {
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let innerCache;
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if (associatedObjectForCache) {
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innerCache = cache.get(associatedObjectForCache);
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if (innerCache === undefined) {
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innerCache = new Map();
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cache.set(associatedObjectForCache, innerCache);
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}
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} else {
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innerCache = new Map();
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}
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/**
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* @param {string} context context used to create relative path
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* @param {string} identifier identifier used to create relative path
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* @returns {string} the returned relative path
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*/
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const boundFn = (context, identifier) => {
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let cachedResult;
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let innerSubCache = innerCache.get(context);
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if (innerSubCache === undefined) {
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innerCache.set(context, (innerSubCache = new Map()));
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} else {
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cachedResult = innerSubCache.get(identifier);
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}
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if (cachedResult !== undefined) {
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return cachedResult;
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} else {
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const result = fn(context, identifier);
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innerSubCache.set(identifier, result);
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return result;
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}
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};
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return boundFn;
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};
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/**
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* @param {string} context context used to create relative path
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* @param {Object=} associatedObjectForCache an object to which the cache will be attached
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* @returns {function(string): string} cached function
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*/
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cachedFn.bindContextCache = (context, associatedObjectForCache) => {
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let innerSubCache;
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if (associatedObjectForCache) {
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let innerCache = cache.get(associatedObjectForCache);
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if (innerCache === undefined) {
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innerCache = new Map();
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cache.set(associatedObjectForCache, innerCache);
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}
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innerSubCache = innerCache.get(context);
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if (innerSubCache === undefined) {
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innerCache.set(context, (innerSubCache = new Map()));
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}
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} else {
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innerSubCache = new Map();
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}
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/**
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* @param {string} identifier identifier used to create relative path
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* @returns {string} the returned relative path
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*/
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const boundFn = identifier => {
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const cachedResult = innerSubCache.get(identifier);
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if (cachedResult !== undefined) {
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return cachedResult;
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} else {
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const result = fn(context, identifier);
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innerSubCache.set(identifier, result);
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return result;
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}
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};
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return boundFn;
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};
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return cachedFn;
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};
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/**
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*
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* @param {string} context context for relative path
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* @param {string} identifier identifier for path
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* @returns {string} a converted relative path
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*/
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const _makePathsRelative = (context, identifier) => {
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return identifier
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.split(SEGMENTS_SPLIT_REGEXP)
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.map(str => absoluteToRequest(context, str))
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.join("");
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};
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exports.makePathsRelative = makeCacheable(_makePathsRelative);
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/**
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* @param {string} context absolute context path
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* @param {string} request any request string may containing absolute paths, query string, etc.
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* @returns {string} a new request string avoiding absolute paths when possible
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*/
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const _contextify = (context, request) => {
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return request
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.split("!")
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.map(r => absoluteToRequest(context, r))
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.join("!");
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};
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const contextify = makeCacheable(_contextify);
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exports.contextify = contextify;
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/**
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* @param {string} context absolute context path
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* @param {string} request any request string
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* @returns {string} a new request string using absolute paths when possible
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*/
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const _absolutify = (context, request) => {
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return request
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.split("!")
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.map(r => requestToAbsolute(context, r))
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.join("!");
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};
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const absolutify = makeCacheable(_absolutify);
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exports.absolutify = absolutify;
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const PATH_QUERY_FRAGMENT_REGEXP = /^((?:\0.|[^?#\0])*)(\?(?:\0.|[^#\0])*)?(#.*)?$/;
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/** @typedef {{ resource: string, path: string, query: string, fragment: string }} ParsedResource */
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/**
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* @param {string} str the path with query and fragment
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* @returns {ParsedResource} parsed parts
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*/
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const _parseResource = str => {
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const match = PATH_QUERY_FRAGMENT_REGEXP.exec(str);
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return {
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resource: str,
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path: match[1].replace(/\0(.)/g, "$1"),
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query: match[2] ? match[2].replace(/\0(.)/g, "$1") : "",
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fragment: match[3] || ""
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};
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};
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exports.parseResource = (realFn => {
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/** @type {WeakMap<object, Map<string, ParsedResource>>} */
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const cache = new WeakMap();
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const getCache = associatedObjectForCache => {
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const entry = cache.get(associatedObjectForCache);
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if (entry !== undefined) return entry;
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/** @type {Map<string, ParsedResource>} */
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const map = new Map();
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cache.set(associatedObjectForCache, map);
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return map;
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};
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/**
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* @param {string} str the path with query and fragment
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* @param {Object=} associatedObjectForCache an object to which the cache will be attached
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* @returns {ParsedResource} parsed parts
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*/
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const fn = (str, associatedObjectForCache) => {
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if (!associatedObjectForCache) return realFn(str);
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const cache = getCache(associatedObjectForCache);
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const entry = cache.get(str);
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if (entry !== undefined) return entry;
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const result = realFn(str);
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cache.set(str, result);
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return result;
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};
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fn.bindCache = associatedObjectForCache => {
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const cache = getCache(associatedObjectForCache);
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return str => {
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const entry = cache.get(str);
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if (entry !== undefined) return entry;
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const result = realFn(str);
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cache.set(str, result);
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return result;
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};
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};
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return fn;
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})(_parseResource);
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/**
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* @param {string} filename the filename which should be undone
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* @param {string} outputPath the output path that is restored (only relevant when filename contains "..")
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* @param {boolean} enforceRelative true returns ./ for empty paths
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* @returns {string} repeated ../ to leave the directory of the provided filename to be back on output dir
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*/
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exports.getUndoPath = (filename, outputPath, enforceRelative) => {
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let depth = -1;
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let append = "";
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outputPath = outputPath.replace(/[\\/]$/, "");
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for (const part of filename.split(/[/\\]+/)) {
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if (part === "..") {
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if (depth > -1) {
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depth--;
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} else {
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const i = outputPath.lastIndexOf("/");
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const j = outputPath.lastIndexOf("\\");
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const pos = i < 0 ? j : j < 0 ? i : Math.max(i, j);
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if (pos < 0) return outputPath + "/";
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append = outputPath.slice(pos + 1) + "/" + append;
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outputPath = outputPath.slice(0, pos);
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}
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} else if (part !== ".") {
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depth++;
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}
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}
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return depth > 0
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? `${"../".repeat(depth)}${append}`
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: enforceRelative
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? `./${append}`
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: append;
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};
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