webpack/lib/SourceMapDevToolPlugin.js

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

function SourceMapDevToolPlugin(sourceMapFilename, sourceMappingURLComment, moduleFilenameTemplate, fallbackModuleFilenameTemplate) {
	this.sourceMapFilename = sourceMapFilename;
	this.sourceMappingURLComment = sourceMappingURLComment || "\n//# sourceMappingURL=[url]";
	this.moduleFilenameTemplate = moduleFilenameTemplate || "webpack:///[resourcePath]";
	this.fallbackModuleFilenameTemplate = fallbackModuleFilenameTemplate || "webpack:///[resourcePath]?[hash]";
}
module.exports = SourceMapDevToolPlugin;
SourceMapDevToolPlugin.prototype.apply = function(compiler) {
	var sourceMapFilename = this.sourceMapFilename;
	var sourceMappingURLComment = this.sourceMappingURLComment;
	var moduleFilenameTemplate = this.moduleFilenameTemplate;
	var fallbackModuleFilenameTemplate = this.fallbackModuleFilenameTemplate;
	var requestShortener = new RequestShortener(compiler.context);
	compiler.plugin("compilation", function(compilation) {
		compilation.plugin("build-module", function(module) {
			module.useSourceMap = true;
		});
		compilation.plugin("after-optimize-chunk-assets", function(chunks) {
			chunks.forEach(function(chunk) {
				chunk.files.slice().forEach(function(file) {
					var asset = this.assets[file];
					if(asset.__SourceMapDevTool_Data) {
						var data = asset.__SourceMapDevTool_Data;
						for(var file in data) {
							this.assets[file] = data[file];
						}
						return;
					}
					var sourceMap = asset.map();
					if(sourceMap) {
						var modules = sourceMap.sources.map(function(source) {
							var module = compilation.findModule(source);
							return module || source;
						});
						var moduleFilenames = modules.map(function(module) {
							return ModuleFilenameHelpers.createFilename(module, moduleFilenameTemplate, requestShortener);
						});
						moduleFilenames = ModuleFilenameHelpers.replaceDuplicates(moduleFilenames, function(filename, i) {
							return ModuleFilenameHelpers.createFilename(modules[i], fallbackModuleFilenameTemplate, requestShortener);
						});
						moduleFilenames = ModuleFilenameHelpers.replaceDuplicates(moduleFilenames, function(filename, i, n) {
							for(var j = 0; j < n; j++)
								filename += "*";
							return filename;
						});
						sourceMap.sources = moduleFilenames;
						if(sourceMap.sourcesContent) {
							sourceMap.sourcesContent = sourceMap.sourcesContent.map(function(content, i) {
								return content + "\n\n\n" + ModuleFilenameHelpers.createFooter(modules[i], requestShortener);
							});
						}
						sourceMap.sourceRoot = "";
						sourceMap.file = file;
						asset.__SourceMapDevTool_Data = {};
						if(sourceMapFilename) {
							var filename = file, query = "";
							var idx = filename.indexOf("?");
							if(idx >= 0) {
								query = filename.substr(idx);
								filename = filename.substr(0, idx);
							}
							var sourceMapFile = sourceMapFilename
								.replace(Template.REGEXP_FILE, filename)
								.replace(Template.REGEXP_QUERY, query)
								.replace(Template.REGEXP_FILEBASE, basename(filename))
								.replace(Template.REGEXP_HASH, this.hash)
								.replace(Template.REGEXP_ID, chunk.id);
							var sourceMapUrl = path.relative(path.dirname(file), sourceMapFile).replace(/\\/g, "/");
							asset.__SourceMapDevTool_Data[file] = this.assets[file] = new ConcatSource(asset, sourceMappingURLComment.replace(/\[url\]/g, sourceMapUrl));
							asset.__SourceMapDevTool_Data[sourceMapFile] = this.assets[sourceMapFile] = new RawSource(JSON.stringify(sourceMap));
							chunk.files.push(sourceMapFile);
						} else {
							asset.__SourceMapDevTool_Data[file] = this.assets[file] = new ConcatSource(asset, sourceMappingURLComment.replace(/\[url\]/g, "data:application/json;base64," + new Buffer(JSON.stringify(sourceMap)).toString("base64")));
						}
					}
				}, this);
			}, this);
		});
	});
};

function basename(name) {
	if(name.indexOf("/") < 0) return name;
	return name.substr(name.lastIndexOf("/")+1);
}