webpack/lib/UmdMainTemplatePlugin.js

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
var ConcatSource = require("webpack-core/lib/ConcatSource");
var OriginalSource = require("webpack-core/lib/OriginalSource");
var Template = require("./Template");

function accessorToObjectAccess(accessor) {
	return accessor.map(function(a) {
		return "[" + JSON.stringify(a) + "]";
	}).join("");
}

function accessorAccess(base, accessor) {
	accessor = [].concat(accessor);
	return accessor.map(function(a, idx) {
		a = base + accessorToObjectAccess(accessor.slice(0, idx+1));
		if(idx === accessor.length - 1) return a;
		return a + " = " + a + " || {}";
	}).join(", ");
}

function UmdMainTemplatePlugin(name) {
	this.name = name;
}
module.exports = UmdMainTemplatePlugin;
UmdMainTemplatePlugin.prototype.apply = function(mainTemplate) {
	mainTemplate.plugin("render", function(source, chunk, hash) {
		var externals = chunk.modules.filter(function(m) {
			return m.external;
		});
		function replaceKeys(str) {
			return (str
				.replace(Template.REGEXP_HASH, hash)
				.replace(Template.REGEXP_CHUNKHASH, chunk.renderedHash)
				.replace(Template.REGEXP_ID, chunk.id)
				.replace(Template.REGEXP_NAME, chunk.name || chunk.id));
		}
		function externalsDepsArray() {
			return "[" + replaceKeys(externals.map(function(m) {
				return JSON.stringify(typeof m.request === "object" ? m.request.amd : m.request);
			}).join(", ")) + "]";
		}
		function externalsRootArray() {
			return replaceKeys(externals.map(function(m) {
				var request = m.request;
				if(typeof request === "object") request = request.root;
				return "root" + accessorToObjectAccess([].concat(request));
			}).join(", "));
		}
		function externalsRequireArray(type) {
			return replaceKeys(externals.map(function(m) {
				var request = m.request;
				if(typeof request === "object") request = request[type];
				if(Array.isArray(request)) {
					var expr = "require(" + JSON.stringify(request[0]) + ")" + accessorToObjectAccess(request.slice(1));
				} else 
					var expr = "require(" + JSON.stringify(request) + ")";
				if(m.optional) {
					expr = "(function webpackLoadOptionalExternalModule() { try { return " + expr + "; } catch(e) {} }())";
				}
				return expr;
			}).join(", "));
		}
		var externalsArguments = externals.map(function(m) {
			return "__WEBPACK_EXTERNAL_MODULE_" + m.id + "__";
		}).join(", ");
		return new ConcatSource(new OriginalSource(
			"(function webpackUniversalModuleDefinition(root, factory) {\n" +
			"	if(typeof exports === 'object' && typeof module === 'object')\n" +
			"		module.exports = factory(" + externalsRequireArray("commonjs2") + ");\n" +
			"	else if(typeof define === 'function' && define.amd)\n" +
			(externalsArguments ?
			"		define(" + externalsDepsArray() + ", factory);\n"
			:
			"		define(factory);\n"
			) +
			(this.name ?
			"	else if(typeof exports === 'object')\n" +
			"		exports[" + JSON.stringify(replaceKeys([].concat(this.name).pop())) + "] = factory(" + externalsRequireArray("commonjs") + ");\n" +
			"	else\n" +
			"		" + replaceKeys(accessorAccess("root", this.name)) + " = factory(" + externalsRootArray() + ");\n"
			:
			"	else {\n" +
			(externalsArguments ?
			"		var a = typeof exports === 'object' ? factory(" + externalsRequireArray("commonjs") + ") : factory(" + externalsRootArray() + ");\n"
			:
			"		var a = factory();\n"
			) +
			"		for(var i in a) (typeof exports === 'object' ? exports : root)[i] = a[i];\n" +
			"	}\n"
			) +
			"})(this, function(" + externalsArguments + ") {\nreturn ", "webpack/universalModuleDefinition"), source, "\n})\n");
	}.bind(this));
	mainTemplate.plugin("global-hash", function(chunk) {
		if(Template.REGEXP_HASH.test([].concat(this.name || "").join("|")))
			return true;
	}.bind(this));
	mainTemplate.plugin("hash", function(hash) {
		hash.update("umd");
		hash.update(this.name + "");
	}.bind(this));
};