mirror of https://github.com/webpack/webpack.git
100 lines
3.6 KiB
JavaScript
100 lines
3.6 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 ConstDependency = require("./dependencies/ConstDependency");
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const BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
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const ParserHelpers = require("./ParserHelpers");
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const NullFactory = require("./NullFactory");
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class DefinePlugin {
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constructor(definitions) {
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this.definitions = definitions;
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}
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apply(compiler) {
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const definitions = this.definitions;
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compiler.plugin("compilation", (compilation, params) => {
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compilation.dependencyFactories.set(ConstDependency, new NullFactory());
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compilation.dependencyTemplates.set(ConstDependency, new ConstDependency.Template());
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params.normalModuleFactory.plugin("parser", (parser) => {
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(function walkDefinitions(definitions, prefix) {
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Object.keys(definitions).forEach((key) => {
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const code = definitions[key];
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if(code && typeof code === "object" && !(code instanceof RegExp)) {
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walkDefinitions(code, prefix + key + ".");
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applyObjectDefine(prefix + key, code);
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return;
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}
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applyDefineKey(prefix, key);
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applyDefine(prefix + key, code);
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});
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}(definitions, ""));
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function stringifyObj(obj) {
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return "__webpack_require__.i({" + Object.keys(obj).map((key) => {
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const code = obj[key];
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return JSON.stringify(key) + ":" + toCode(code);
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}).join(",") + "})";
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}
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function toCode(code) {
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if(code === null) return "null";
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else if(code === undefined) return "undefined";
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else if(code instanceof RegExp && code.toString) return code.toString();
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else if(typeof code === "function" && code.toString) return "(" + code.toString() + ")";
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else if(typeof code === "object") return stringifyObj(code);
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else return code + "";
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}
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function applyDefineKey(prefix, key) {
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const splittedKey = key.split(".");
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splittedKey.slice(1).forEach((_, i) => {
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const fullKey = prefix + splittedKey.slice(0, i + 1).join(".");
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parser.plugin("can-rename " + fullKey, ParserHelpers.approve);
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});
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}
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function applyDefine(key, code) {
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const isTypeof = /^typeof\s+/.test(key);
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if(isTypeof) key = key.replace(/^typeof\s+/, "");
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code = toCode(code);
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if(!isTypeof) {
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parser.plugin("can-rename " + key, ParserHelpers.approve);
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parser.plugin("evaluate Identifier " + key, (expr) => {
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const res = parser.evaluate(code);
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res.setRange(expr.range);
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return res;
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});
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parser.plugin("expression " + key, ParserHelpers.toConstantDependency(code));
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}
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const typeofCode = isTypeof ? code : "typeof (" + code + ")";
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parser.plugin("evaluate typeof " + key, (expr) => {
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const res = parser.evaluate(typeofCode);
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res.setRange(expr.range);
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return res;
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});
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parser.plugin("typeof " + key, (expr) => {
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const res = parser.evaluate(typeofCode);
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if(!res.isString()) return;
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return ParserHelpers.toConstantDependency(JSON.stringify(res.string)).bind(parser)(expr);
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});
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}
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function applyObjectDefine(key, obj) {
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const code = stringifyObj(obj);
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parser.plugin("can-rename " + key, ParserHelpers.approve);
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parser.plugin("evaluate Identifier " + key, (expr) => new BasicEvaluatedExpression().setRange(expr.range));
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parser.plugin("evaluate typeof " + key, ParserHelpers.evaluateToString("object"));
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parser.plugin("expression " + key, ParserHelpers.toConstantDependency(code));
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parser.plugin("typeof " + key, ParserHelpers.toConstantDependency(JSON.stringify("object")));
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}
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});
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});
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}
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}
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module.exports = DefinePlugin;
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