webpack/lib/ConstPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
var ConstDependency = require("./dependencies/ConstDependency");
var BasicEvaluatedExpression = require("./BasicEvaluatedExpression");

var NullFactory = require("./NullFactory");

function ConstPlugin() {
}
module.exports = ConstPlugin;

ConstPlugin.prototype.apply = function(compiler) {
	compiler.plugin("compilation", function(compilation, params) {
		compilation.dependencyFactories.set(ConstDependency, new NullFactory());
		compilation.dependencyTemplates.set(ConstDependency, new ConstDependency.Template());
	});
	compiler.parser.plugin("statement if", function(statement) {
		var param = this.evaluateExpression(statement.test);
		var bool = param.asBool();
		if(typeof bool === "boolean") {
			if(statement.test.type !== "Literal")
				this.state.current.addDependency(new ConstDependency(bool + "", param.range));
			return bool;
		}
	});
	compiler.parser.plugin("expression ?:", function(expression) {
		var param = this.evaluateExpression(expression.test);
		var bool = param.asBool();
		if(typeof bool === "boolean") {
			if(expression.test.type !== "Literal")
				this.state.current.addDependency(new ConstDependency(bool + "", param.range));
			return bool;
		}
	});
	compiler.parser.plugin("evaluate Identifier __resourceQuery", function(expr) {
		if(!this.state.module) return;
		var res = new BasicEvaluatedExpression();
		res.setString(this.state.module.splitQuery(this.state.module.resource)[1]);
		res.setRange(expr.range);
		return res;
	});
	compiler.parser.plugin("expression __resourceQuery", function(expr) {
		if(!this.state.module) return;
		this.state.current.addVariable("__resourceQuery", JSON.stringify(this.state.module.splitQuery(this.state.module.resource)[1]));
		return true;
	});
};