292 lines
8 KiB
JavaScript
292 lines
8 KiB
JavaScript
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/*
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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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/** @typedef {import("./Module")} Module */
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/** @typedef {import("./Chunk")} Chunk */
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/** @typedef {import("./ModuleTemplate")} ModuleTemplate */
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/** @typedef {import("webpack-sources").ConcatSource} ConcatSource */
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const { ConcatSource } = require("webpack-sources");
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const HotUpdateChunk = require("./HotUpdateChunk");
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const START_LOWERCASE_ALPHABET_CODE = "a".charCodeAt(0);
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const START_UPPERCASE_ALPHABET_CODE = "A".charCodeAt(0);
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const DELTA_A_TO_Z = "z".charCodeAt(0) - START_LOWERCASE_ALPHABET_CODE + 1;
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const FUNCTION_CONTENT_REGEX = /^function\s?\(\)\s?\{\r?\n?|\r?\n?\}$/g;
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const INDENT_MULTILINE_REGEX = /^\t/gm;
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const LINE_SEPARATOR_REGEX = /\r?\n/g;
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const IDENTIFIER_NAME_REPLACE_REGEX = /^([^a-zA-Z$_])/;
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const IDENTIFIER_ALPHA_NUMERIC_NAME_REPLACE_REGEX = /[^a-zA-Z0-9$]+/g;
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const COMMENT_END_REGEX = /\*\//g;
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const PATH_NAME_NORMALIZE_REPLACE_REGEX = /[^a-zA-Z0-9_!§$()=\-^°]+/g;
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const MATCH_PADDED_HYPHENS_REPLACE_REGEX = /^-|-$/g;
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/** @typedef {import("webpack-sources").Source} Source */
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/**
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* @typedef {Object} HasId
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* @property {number | string} id
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*/
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/**
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* @typedef {function(Module, number): boolean} ModuleFilterPredicate
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*/
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/**
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* @param {HasId} a first id object to be sorted
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* @param {HasId} b second id object to be sorted against
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* @returns {-1|0|1} the sort value
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*/
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const stringifyIdSortPredicate = (a, b) => {
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const aId = a.id + "";
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const bId = b.id + "";
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if (aId < bId) return -1;
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if (aId > bId) return 1;
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return 0;
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};
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class Template {
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/**
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*
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* @param {Function} fn a runtime function (.runtime.js) "template"
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* @returns {string} the updated and normalized function string
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*/
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static getFunctionContent(fn) {
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return fn
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.toString()
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.replace(FUNCTION_CONTENT_REGEX, "")
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.replace(INDENT_MULTILINE_REGEX, "")
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.replace(LINE_SEPARATOR_REGEX, "\n");
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}
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/**
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* @param {string} str the string converted to identifier
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* @returns {string} created identifier
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*/
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static toIdentifier(str) {
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if (typeof str !== "string") return "";
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return str
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.replace(IDENTIFIER_NAME_REPLACE_REGEX, "_$1")
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.replace(IDENTIFIER_ALPHA_NUMERIC_NAME_REPLACE_REGEX, "_");
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}
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/**
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*
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* @param {string} str string to be converted to commented in bundle code
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* @returns {string} returns a commented version of string
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*/
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static toComment(str) {
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if (!str) return "";
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return `/*! ${str.replace(COMMENT_END_REGEX, "* /")} */`;
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}
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/**
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*
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* @param {string} str string to be converted to "normal comment"
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* @returns {string} returns a commented version of string
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*/
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static toNormalComment(str) {
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if (!str) return "";
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return `/* ${str.replace(COMMENT_END_REGEX, "* /")} */`;
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}
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/**
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* @param {string} str string path to be normalized
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* @returns {string} normalized bundle-safe path
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*/
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static toPath(str) {
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if (typeof str !== "string") return "";
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return str
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.replace(PATH_NAME_NORMALIZE_REPLACE_REGEX, "-")
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.replace(MATCH_PADDED_HYPHENS_REPLACE_REGEX, "");
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}
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// map number to a single character a-z, A-Z or <_ + number> if number is too big
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/**
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*
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* @param {number} n number to convert to ident
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* @returns {string} returns single character ident
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*/
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static numberToIdentifer(n) {
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// lower case
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if (n < DELTA_A_TO_Z) {
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return String.fromCharCode(START_LOWERCASE_ALPHABET_CODE + n);
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}
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// upper case
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if (n < DELTA_A_TO_Z * 2) {
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return String.fromCharCode(
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START_UPPERCASE_ALPHABET_CODE + n - DELTA_A_TO_Z
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);
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}
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// use multiple letters
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return (
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Template.numberToIdentifer(n % (2 * DELTA_A_TO_Z)) +
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Template.numberToIdentifer(Math.floor(n / (2 * DELTA_A_TO_Z)))
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);
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}
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/**
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*
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* @param {string | string[]} s string to convert to identity
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* @returns {string} converted identity
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*/
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static indent(s) {
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if (Array.isArray(s)) {
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return s.map(Template.indent).join("\n");
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} else {
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const str = s.trimRight();
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if (!str) return "";
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const ind = str[0] === "\n" ? "" : "\t";
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return ind + str.replace(/\n([^\n])/g, "\n\t$1");
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}
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}
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/**
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*
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* @param {string|string[]} s string to create prefix for
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* @param {string} prefix prefix to compose
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* @returns {string} returns new prefix string
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*/
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static prefix(s, prefix) {
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const str = Template.asString(s).trim();
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if (!str) return "";
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const ind = str[0] === "\n" ? "" : prefix;
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return ind + str.replace(/\n([^\n])/g, "\n" + prefix + "$1");
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}
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/**
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*
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* @param {string|string[]} str string or string collection
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* @returns {string} returns a single string from array
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*/
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static asString(str) {
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if (Array.isArray(str)) {
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return str.join("\n");
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}
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return str;
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}
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/**
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* @typedef {Object} WithId
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* @property {string|number} id
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*/
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/**
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* @param {WithId[]} modules a collection of modules to get array bounds for
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* @returns {[number, number] | false} returns the upper and lower array bounds
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* or false if not every module has a number based id
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*/
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static getModulesArrayBounds(modules) {
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let maxId = -Infinity;
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let minId = Infinity;
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for (const module of modules) {
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if (typeof module.id !== "number") return false;
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if (maxId < module.id) maxId = /** @type {number} */ (module.id);
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if (minId > module.id) minId = /** @type {number} */ (module.id);
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}
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if (minId < 16 + ("" + minId).length) {
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// add minId x ',' instead of 'Array(minId).concat(…)'
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minId = 0;
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}
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const objectOverhead = modules
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.map(module => (module.id + "").length + 2)
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.reduce((a, b) => a + b, -1);
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const arrayOverhead =
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minId === 0 ? maxId : 16 + ("" + minId).length + maxId;
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return arrayOverhead < objectOverhead ? [minId, maxId] : false;
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}
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/**
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* @param {Chunk} chunk chunk whose modules will be rendered
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* @param {ModuleFilterPredicate} filterFn function used to filter modules from chunk to render
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* @param {ModuleTemplate} moduleTemplate ModuleTemplate instance used to render modules
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* @param {TODO | TODO[]} dependencyTemplates templates needed for each module to render dependencies
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* @param {string=} prefix applying prefix strings
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* @returns {ConcatSource} rendered chunk modules in a Source object
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*/
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static renderChunkModules(
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chunk,
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filterFn,
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moduleTemplate,
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dependencyTemplates,
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prefix = ""
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) {
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const source = new ConcatSource();
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const modules = chunk.getModules().filter(filterFn);
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let removedModules;
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if (chunk instanceof HotUpdateChunk) {
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removedModules = chunk.removedModules;
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}
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if (
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modules.length === 0 &&
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(!removedModules || removedModules.length === 0)
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) {
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source.add("[]");
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return source;
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}
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/** @type {{id: string|number, source: Source|string}[]} */
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const allModules = modules.map(module => {
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return {
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id: module.id,
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source: moduleTemplate.render(module, dependencyTemplates, {
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chunk
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})
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};
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});
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if (removedModules && removedModules.length > 0) {
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for (const id of removedModules) {
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allModules.push({
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id,
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source: "false"
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});
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}
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}
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const bounds = Template.getModulesArrayBounds(allModules);
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if (bounds) {
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// Render a spare array
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const minId = bounds[0];
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const maxId = bounds[1];
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if (minId !== 0) {
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source.add(`Array(${minId}).concat(`);
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}
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source.add("[\n");
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/** @type {Map<string|number, {id: string|number, source: Source|string}>} */
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const modules = new Map();
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for (const module of allModules) {
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modules.set(module.id, module);
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}
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for (let idx = minId; idx <= maxId; idx++) {
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const module = modules.get(idx);
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if (idx !== minId) {
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source.add(",\n");
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}
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source.add(`/* ${idx} */`);
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if (module) {
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source.add("\n");
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source.add(module.source);
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}
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}
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source.add("\n" + prefix + "]");
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if (minId !== 0) {
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source.add(")");
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}
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} else {
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// Render an object
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source.add("{\n");
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allModules.sort(stringifyIdSortPredicate).forEach((module, idx) => {
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if (idx !== 0) {
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source.add(",\n");
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}
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source.add(`\n/***/ ${JSON.stringify(module.id)}:\n`);
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source.add(module.source);
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});
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source.add(`\n\n${prefix}}`);
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}
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return source;
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}
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}
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module.exports = Template;
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