webpack/lib/dependencies/RequireResolveDependencyParserPlugin.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 RequireResolveDependency = require("./RequireResolveDependency");
var RequireResolveContextDependency = require("./RequireResolveContextDependency");
var RequireResolveHeaderDependency = require("./RequireResolveHeaderDependency");
var ContextDependencyHelpers = require("./ContextDependencyHelpers");

function RequireResolveDependencyParserPlugin(options) {
	this.options = options;
}

module.exports = RequireResolveDependencyParserPlugin;

RequireResolveDependencyParserPlugin.prototype.apply = function(parser) {
	var options = this.options;
	parser.plugin("call require.resolve", function(expr) {
		if(expr.arguments.length !== 1) return;
		var param = this.evaluateExpression(expr.arguments[0]);
		if(param.isConditional()) {
			param.options.forEach(function(option) {
				var result = this.applyPluginsBailResult("call require.resolve:item", expr, option);
				if(result === undefined) {
					this.applyPluginsBailResult("call require.resolve:context", expr, option);
				}
			}, this);
			this.state.current.addDependency(new RequireResolveHeaderDependency(expr.callee.range));
			return true;
		} else {
			var result = this.applyPluginsBailResult("call require.resolve:item", expr, param);
			if(result === undefined) {
				this.applyPluginsBailResult("call require.resolve:context", expr, param);
			}
			this.state.current.addDependency(new RequireResolveHeaderDependency(expr.callee.range));
			return true;
		}
	});
	parser.plugin("call require.resolve:item", function(expr, param) {
		if(param.isString()) {
			var dep = new RequireResolveDependency(param.string, param.range);
			dep.loc = expr.loc;
			dep.optional = !!this.scope.inTry;
			this.state.current.addDependency(dep);
			return true;
		}
	});
	parser.plugin("call require.resolve:context", function(expr, param) {
		var dep = ContextDependencyHelpers.create(RequireResolveContextDependency, param.range, param, expr, options);
		if(!dep) return;
		dep.loc = expr.loc;
		dep.optional = !!this.scope.inTry;
		this.state.current.addDependency(dep);
		return true;
	});
};