mirror of https://github.com/webpack/webpack.git
116 lines
3.3 KiB
JavaScript
116 lines
3.3 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const { join, dirname: fsDirname } = require("./util/fs");
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const NORMALIZE_SLASH_DIRECTION_REGEXP = /\\/g;
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const PATH_CHARS_REGEXP = /[-[\]{}()*+?.,\\^$|#\s]/g;
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const SEPARATOR_REGEXP = /[/\\]$/;
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const FRONT_OR_BACK_BANG_REGEXP = /^!|!$/g;
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const INDEX_JS_REGEXP = /\/index.js(!|\?|\(query\))/g;
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const MATCH_RESOURCE_REGEXP = /!=!/;
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/**
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* @param {string} request the request
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* @returns {string} the normalized request
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*/
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const normalizeBackSlashDirection = request => {
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return request.replace(NORMALIZE_SLASH_DIRECTION_REGEXP, "/");
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};
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/**
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* @param {string} path the path to match
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* @returns {RegExp} the path matcher
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*/
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const createRegExpForPath = path => {
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const regexpTypePartial = path.replace(PATH_CHARS_REGEXP, "\\$&");
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return new RegExp(`(^|!)${regexpTypePartial}`, "g");
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};
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class RequestShortener {
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/**
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* @param {string} dir the directory
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*/
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constructor(dir) {
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/** @type {RegExp | null} */
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this.currentDirectoryRegExp = null;
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/** @type {RegExp | null} */
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this.parentDirectoryRegExp = null;
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/** @type {RegExp | null} */
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this.buildinsRegExp = null;
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/** @type {boolean} */
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this.buildinsAsModule = false;
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let directory = normalizeBackSlashDirection(dir);
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if (SEPARATOR_REGEXP.test(directory)) {
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directory = directory.substr(0, directory.length - 1);
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}
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if (directory) {
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this.currentDirectoryRegExp = createRegExpForPath(directory);
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}
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const dirname = fsDirname(undefined, directory);
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const endsWithSeparator = SEPARATOR_REGEXP.test(dirname);
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const parentDirectory = endsWithSeparator
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? dirname.substr(0, dirname.length - 1)
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: dirname;
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if (parentDirectory && parentDirectory !== directory) {
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this.parentDirectoryRegExp = createRegExpForPath(`${parentDirectory}/`);
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}
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if (__dirname.length >= 2) {
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const buildins = normalizeBackSlashDirection(
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join(undefined, __dirname, "..")
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);
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const buildinsAsModule =
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this.currentDirectoryRegExp &&
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this.currentDirectoryRegExp.test(buildins);
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this.buildinsAsModule = buildinsAsModule;
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this.buildinsRegExp = createRegExpForPath(buildins);
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}
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/** @type {Map<string, string>} */
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this.cache = new Map();
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}
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/**
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* @param {string | undefined | null} request the request to shorten
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* @returns {string | undefined | null} the shortened request
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*/
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shorten(request) {
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if (!request) {
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return request;
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}
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const cacheEntry = this.cache.get(request);
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if (cacheEntry !== undefined) {
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return cacheEntry;
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}
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let result = normalizeBackSlashDirection(request);
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if (this.buildinsAsModule && this.buildinsRegExp) {
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result = result.replace(this.buildinsRegExp, "!(webpack)");
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}
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if (this.currentDirectoryRegExp) {
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result = result.replace(this.currentDirectoryRegExp, "!.");
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}
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if (this.parentDirectoryRegExp) {
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result = result.replace(this.parentDirectoryRegExp, "!../");
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}
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if (!this.buildinsAsModule && this.buildinsRegExp) {
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result = result.replace(this.buildinsRegExp, "!(webpack)");
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}
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result = result.replace(INDEX_JS_REGEXP, "$1");
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result = result.replace(FRONT_OR_BACK_BANG_REGEXP, "");
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result = result.replace(MATCH_RESOURCE_REGEXP, " = ");
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this.cache.set(request, result);
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return result;
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}
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}
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module.exports = RequestShortener;
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