webpack/lib/ModuleFilenameHelpers.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 ModuleFilenameHelpers = exports;

ModuleFilenameHelpers.ALL_LOADERS_RESOURCE = "[all-loaders][resource]";
ModuleFilenameHelpers.REGEXP_ALL_LOADERS_RESOURCE = /\[all-?loaders\]\[resource\]/gi;
ModuleFilenameHelpers.LOADERS_RESOURCE = "[loaders][resource]";
ModuleFilenameHelpers.REGEXP_LOADERS_RESOURCE = /\[loaders\]\[resource\]/gi;
ModuleFilenameHelpers.RESOURCE = "[resource]";
ModuleFilenameHelpers.REGEXP_RESOURCE = /\[resource\]/gi;
ModuleFilenameHelpers.ABSOLUTE_RESOURCE_PATH = "[absolute-resource-path]";
ModuleFilenameHelpers.REGEXP_ABSOLUTE_RESOURCE_PATH = /\[abs(olute)?-?resource-?path\]/gi;
ModuleFilenameHelpers.RESOURCE_PATH = "[resource-path]";
ModuleFilenameHelpers.REGEXP_RESOURCE_PATH = /\[resource-?path\]/gi;
ModuleFilenameHelpers.ALL_LOADERS = "[all-loaders]";
ModuleFilenameHelpers.REGEXP_ALL_LOADERS = /\[all-?loaders\]/gi;
ModuleFilenameHelpers.LOADERS = "[loaders]";
ModuleFilenameHelpers.REGEXP_LOADERS = /\[loaders\]/gi;
ModuleFilenameHelpers.QUERY = "[query]";
ModuleFilenameHelpers.REGEXP_QUERY = /\[query\]/gi;
ModuleFilenameHelpers.ID = "[id]";
ModuleFilenameHelpers.REGEXP_ID = /\[id\]/gi;
ModuleFilenameHelpers.HASH = "[hash]";
ModuleFilenameHelpers.REGEXP_HASH = /\[hash\]/gi;

function getAfter(str, token) {
	var idx = str.indexOf(token);
	return idx < 0 ? "" : str.substr(idx);
}

function getBefore(str, token) {
	var idx = str.lastIndexOf(token);
	return idx < 0 ? "" : str.substr(0, idx);
}

function getHash(str) {
	var hash = require("crypto").createHash("md5");
	hash.update(str);
	return hash.digest("hex").substr(0, 4);
}

ModuleFilenameHelpers.createFilename = function createFilename(module, moduleFilenameTemplate, requestShortener) {
	if(typeof module === "string") {
		var shortIdentifier = requestShortener.shorten(module);
		var identifier = shortIdentifier;
		var moduleId = "";
		var absoluteResourcePath = module.split("!").pop();
		var hash = getHash(identifier);
	} else {
		var shortIdentifier = module.readableIdentifier(requestShortener);
		var identifier = requestShortener.shorten(module.identifier());
		var moduleId = module.id;
		var absoluteResourcePath = module.resourcePath || module.identifier().split("!").pop();
		var hash = getHash(identifier);
	}
	var resource = shortIdentifier.split("!").pop();
	var loaders = getBefore(shortIdentifier, "!");
	var allLoaders = getBefore(identifier, "!");
	var query = getAfter(resource, "?");
	var resourcePath = resource.substr(0, resource.length - query.length);
	return (moduleFilenameTemplate
		.replace(ModuleFilenameHelpers.REGEXP_ALL_LOADERS_RESOURCE, identifier)
		.replace(ModuleFilenameHelpers.REGEXP_LOADERS_RESOURCE, shortIdentifier)
		.replace(ModuleFilenameHelpers.REGEXP_RESOURCE, resource)
		.replace(ModuleFilenameHelpers.REGEXP_RESOURCE_PATH, resourcePath)
		.replace(ModuleFilenameHelpers.REGEXP_ABSOLUTE_RESOURCE_PATH, absoluteResourcePath)
		.replace(ModuleFilenameHelpers.REGEXP_ALL_LOADERS, allLoaders)
		.replace(ModuleFilenameHelpers.REGEXP_LOADERS, loaders)
		.replace(ModuleFilenameHelpers.REGEXP_QUERY, query)
		.replace(ModuleFilenameHelpers.REGEXP_ID, moduleId)
		.replace(ModuleFilenameHelpers.REGEXP_HASH, hash)
	);
};

ModuleFilenameHelpers.createFooter = function createFooter(module, requestShortener) {
	if(typeof module === "string") {
		return [
			"/** WEBPACK FOOTER **",
			" ** " + requestShortener.shorten(module),
			" **/"
		].join("\n");
	} else {
		return [
			"/*****************",
			" ** WEBPACK FOOTER",
			" ** " + module.readableIdentifier(requestShortener),
			" ** module id = " + module.id,
			" ** module chunks = " + module.chunks.map(function(c) { return c.id; }).join(" "),
			" **/"
		].join("\n");
	}
};

ModuleFilenameHelpers.replaceDuplicates = function replaceDuplicates(array, fn, comparator) {
	var countMap = {};
	var posMap = {};
	array.forEach(function(item, idx) {
		countMap[item] = (countMap[item] || []);
		countMap[item].push(idx);
		posMap[item] = 0;
	});
	if(comparator) {
		Object.keys(countMap).forEach(function(item) {
			countMap[item].sort(comparator);
		});
	}
	return array.map(function(item, i) {
		if(countMap[item].length > 1) {
			if(comparator && countMap[item][0] === i)
				return item;
			return fn(item, i, posMap[item]++);
		} else return item;
	});
};