mirror of https://github.com/webpack/webpack.git
77 lines
2.0 KiB
JavaScript
77 lines
2.0 KiB
JavaScript
"use strict";
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const path = require("path");
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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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*
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* @param {string} maybeAbsolutePath path to check
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* @returns {boolean} returns true if path is "Absolute Path"-like
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*/
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const looksLikeAbsolutePath = maybeAbsolutePath => {
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if (/^\/.*\/$/.test(maybeAbsolutePath)) {
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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 false;
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}
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return /^(?:[a-z]:\\|\/)/i.test(maybeAbsolutePath);
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};
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/**
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*
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* @param {string} p path to normalize
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* @returns {string} normalized version of path
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*/
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const normalizePathSeparator = p => p.replace(/\\/g, "/");
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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(/([|! ])/)
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.map(
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str =>
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looksLikeAbsolutePath(str)
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? normalizePathSeparator(path.relative(context, str))
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: str
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)
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.join("");
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};
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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 {MakeRelativePathsCache=} cache the cache object being set
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* @returns {string} the returned relative path
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*/
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exports.makePathsRelative = (context, identifier, cache) => {
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if (!cache) return _makePathsRelative(context, identifier);
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const relativePaths =
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cache.relativePaths || (cache.relativePaths = new Map());
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let cachedResult;
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let contextCache = relativePaths.get(context);
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if (typeof 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 (typeof 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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