mirror of https://github.com/webpack/webpack.git
86 lines
2.9 KiB
JavaScript
86 lines
2.9 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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var ConstDependency = require("./dependencies/ConstDependency");
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var BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
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function DefinePlugin(definitions) {
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this.definitions = definitions;
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}
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module.exports = DefinePlugin;
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DefinePlugin.prototype.apply = function(compiler) {
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(function walkDefinitions(definitions, prefix) {
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Object.keys(definitions).forEach(function(key) {
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var code = definitions[key];
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if(typeof code === "object") {
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walkDefinitions(code, key + ".");
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applyObjectDefine(key, code);
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return;
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}
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if(typeof code !== "string" && code.toString) code = code.toString();
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else if(typeof code !== "string") code = code + "";
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applyDefine(prefix + key, code);
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});
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}(this.definitions, ""));
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function applyDefine(key, code) {
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var recurse = false;
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var recurseTypeof = false;
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compiler.parser.plugin("evaluate Identifier " + key, function(expr) {
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if(recurse) return;
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recurse = true;
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var res = compiler.parser.evaluate(code);
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recurse = false;
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res.setRange(expr.range);
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return res;
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});
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compiler.parser.plugin("evaluate typeof " + key, function(expr) {
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if(recurseTypeof) return;
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recurseTypeof = true;
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var res = compiler.parser.evaluate("typeof (" + code + ")");
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recurseTypeof = false;
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res.setRange(expr.range);
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return res;
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});
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compiler.parser.plugin("expression " + key, function(expr) {
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var dep = new ConstDependency("("+code+")", expr.range);
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dep.loc = expr.loc;
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this.state.current.addDependency(dep);
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return true;
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});
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compiler.parser.plugin("typeof " + key, function(expr) {
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var res = compiler.parser.evaluate("typeof (" + code + ")");
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if(!res.isString()) return;
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var dep = new ConstDependency(JSON.stringify(res.string), expr.range);
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dep.loc = expr.loc;
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this.state.current.addDependency(dep);
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return true;
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});
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}
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function applyObjectDefine(key, obj) {
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var code = "{" + Object.keys(obj).map(function(key) {
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var code = obj[key];
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if(typeof code !== "string" && code.toString) code = code.toString();
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else if(typeof code !== "string") code = code + "";
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return JSON.stringify(key) + ":" + code;
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}).join(",") + "}";
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compiler.parser.plugin("evaluate Identifier " + key, function(expr) {
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return new BasicEvaluatedExpression().setRange(expr.range);
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});
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compiler.parser.plugin("evaluate typeof " + key, function(expr) {
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return new BasicEvaluatedExpression().setString("object").setRange(expr.range);
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});
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compiler.parser.plugin("expression " + key, function(expr) {
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var dep = new ConstDependency("("+code+")", expr.range);
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dep.loc = expr.loc;
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this.state.current.addDependency(dep);
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return true;
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});
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compiler.parser.plugin("typeof " + key, function(expr) {
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var dep = new ConstDependency("\"object\"", expr.range);
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dep.loc = expr.loc;
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this.state.current.addDependency(dep);
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return true;
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});
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}
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}; |