mirror of https://github.com/webpack/webpack.git
130 lines
3.7 KiB
JavaScript
130 lines
3.7 KiB
JavaScript
/*
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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 SEGEMENTS_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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*
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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(SEGEMENTS_SPLIT_REGEXP)
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.map(str => absoluteToRequest(context, str))
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.join("");
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};
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const makePathsRelativeCache = new WeakMap();
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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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* @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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exports.makePathsRelative = (context, identifier, associatedObjectForCache) => {
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if (!associatedObjectForCache) return _makePathsRelative(context, identifier);
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let relativePaths = makePathsRelativeCache.get(associatedObjectForCache);
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if (relativePaths === undefined) {
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relativePaths = new Map();
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makePathsRelativeCache.set(associatedObjectForCache, relativePaths);
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}
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let cachedResult;
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let contextCache = relativePaths.get(context);
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if (contextCache === undefined) {
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relativePaths.set(context, (contextCache = new Map()));
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} else {
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cachedResult = contextCache.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 relativePath = _makePathsRelative(context, identifier);
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contextCache.set(identifier, relativePath);
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return relativePath;
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}
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};
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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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exports.contextify = contextify;
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