webpack/lib/Template.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 Tapable = require("tapable");
var ConcatSource = require("webpack-core/lib/ConcatSource");

function Template(outputOptions) {
	Tapable.call(this);
	this.outputOptions = outputOptions || {};
}
module.exports = Template;

Template.getFunctionContent = function(fn) {
	return fn.toString().replace(/^function\s?\(\)\s?\{\n?|\n?\}$/g, "").replace(/^\t/mg, "");
};

Template.toIdentifier = function(str) {
	return str.replace(/^[^a-zA-Z$_]/,"_").replace(/[^a-zA-Z0-9$_]/g, "_");
};

Template.prototype = Object.create(Tapable.prototype);

Template.prototype.indent = function indent(str) {
	if(Array.isArray(str)) {
		return str.map(indent).join("\n");
	} else {
		str = str.trimRight();
		if(!str) return "";
		return (str[0] === "\n" ? "" : "\t") + str.replace(/\n([^\n])/g, "\n\t$1");
	}
};

Template.prototype.prefix = function(str, prefix) {
	if(Array.isArray(str)) {
		str = str.join("\n");
	}
	str = str.trim();
	if(!str) return "";
	return (str[0] === "\n" ? "" : prefix) + str.replace(/\n([^\n])/g, "\n" + prefix + "$1");
};

Template.prototype.asString = function(str) {
	if(Array.isArray(str)) {
		return str.join("\n");
	}
	return str;
};

Template.prototype.renderChunkModules = function(chunk, moduleTemplate, dependencyTemplates, prefix) {
	if(!prefix) prefix = "";
	var source = new ConcatSource();
	if(chunk.modules.length === 0) {
		source.add("[]");
		return source;
	}
	var maxId = chunk.modules[chunk.modules.length - 1].id;
	var minId = chunk.modules[0].id;
	if(minId < 16 + ("" + minId).length) {
		minId = 0;
	}
	var objectOverhead = chunk.modules.map(function(module) {
		return (module.id + "").length + 2;
	}).reduce(function(a, b) { return a + b; }, -1);
	var arrayOverhead = minId === 0 ? maxId : 16 + ("" + minId).length + maxId;
	if(arrayOverhead < objectOverhead) {
		// Render a sparse array
		if(minId !== 0) source.add("Array(" + minId + ").concat(");
		source.add("[\n");
		var modules = {};
		chunk.modules.forEach(function(module) {
			modules[module.id] = module;
		});
		for(var idx = minId; idx <= maxId; idx++) {
			var module = modules[idx];
			if(idx !== minId) source.add(",\n");
			source.add("/* " + idx + " */");
			if(module) {
				source.add("\n");
				source.add(moduleTemplate.render(module, dependencyTemplates, chunk));
			}
		}
		source.add("\n" + prefix + "]");
		if(minId !== 0) source.add(")");
	} else {
		// Render an object
		source.add("{\n");
		chunk.modules.forEach(function(module, idx) {
			if(idx !== 0) source.add(",\n");
			source.add("\n/***/ " + module.id + ":\n");
			source.add(moduleTemplate.render(module, dependencyTemplates, chunk));
		});
		source.add("\n\n" + prefix + "}");
	}
	return source;
};