don't use loaders in SourceMaps, just the resource

fixed #154

lib/loader.js

@@ -97,13 +97,15 @@ module.exports = function(content, map) {
 			map = result.map;
 			if(map.sources) {
 				map.sources = map.sources.map(function(source) {
+					source = source.split("!").pop();
 					var p = path.relative(query.context || this.options.context, source).replace(/\\/g, "/");
 					if(p.indexOf("../") !== 0)
 						p = "./" + p;
 					return "/" + p;
 				}, this);
 				map.sourceRoot = "webpack://";
 			}
+			map.file = map.file.split("!").pop();
 			map = JSON.stringify(map);
 			moduleJs = "exports.push([module.id, " + cssAsString + ", \"\", " + map + "]);";
 		} else {

lib/processCss.js

@@ -163,7 +163,8 @@ module.exports = function processCss(inputSource, inputMap, options, callback) {
 	}
 
 	pipeline.process(inputSource, {
-		from: options.from,
+		// we need a prefix to avoid path rewriting of PostCSS
+		from: "/css-loader!" + options.from,
 		to: options.to,
 		map: {
 			prev: inputMap,

test/helpers.js

@@ -10,10 +10,10 @@ function getEvaluated(output, modules) {
 		var fn = vm.runInThisContext("(function(module, exports, require) {" + output + "})", "testcase.js");
 		var m = { exports: {}, id: 1 };
 		fn(m, m.exports, function(module) {
-			if(module === require.resolve("../lib/css-base"))
+			if(module.indexOf("css-base") >= 0)
 				return require("../lib/css-base");
-			if(module.indexOf("-!loader!") === 0)
-				module = module.substr(9);
+			if(module.indexOf("-!/path/css-loader!") === 0)
+				module = module.substr(19);
 			if(modules && modules[module])
 				return modules[module];
 			return "{" + module + "}";
@@ -41,7 +41,7 @@ function runLoader(loader, input, map, addOptions, callback) {
 		async: function() {
 			return callback;
 		},
-		loaders: [{request: "loader"}],
+		loaders: [{request: "/path/css-loader"}],
 		loaderIndex: 0,
 		context: "",
 		resource: "test.css",
@@ -80,6 +80,16 @@ exports.testWithMap = function test(name, input, map, result, query, modules) {
 	});
 };
 
+exports.testMap = function test(name, input, map, addOptions, result, modules) {
+	it(name, function(done) {
+		runLoader(cssLoader, input, map, addOptions, function(err, output) {
+			if(err) return done(err);
+			assetEvaluated(output, result, modules);
+			done();
+		});
+	});
+};
+
 exports.testLocals = function testLocals(name, input, result, query, modules) {
 	it(name, function(done) {
 		runLoader(cssLoaderLocals, input, undefined, {

test/sourceMapTest.js

@@ -1,12 +1,64 @@
 /*globals describe */
 
 var testWithMap = require("./helpers").testWithMap;
+var testMap = require("./helpers").testMap;
 
-describe("falsy source maps", function() {
-	testWithMap("null map doesn't cause an error", ".class { a: b c d; }", null, [
+describe("source maps", function() {
+	testWithMap("falsy: null map doesn't cause an error", ".class { a: b c d; }", null, [
 		[1, ".class { a: b c d; }", ""]
 	]);
-	testWithMap("undefined map doesn't cause an error", ".class { a: b c d; }", undefined, [
+	testWithMap("falsy: undefined map doesn't cause an error", ".class { a: b c d; }", undefined, [
 		[1, ".class { a: b c d; }", ""]
 	]);
+	testMap("generate sourceMap (1 loader)", ".class { a: b c d; }", undefined, {
+		loaders: [{request: "/path/css-loader"}],
+		options: { context: "/" },
+		resource: "/folder/test.css",
+		request: "/path/css-loader!/folder/test.css",
+		query: "?sourceMap"
+	}, [
+		[1, ".class { a: b c d; }", "", {
+			file: 'test.css',
+			mappings: 'AAAA,SAAS,SAAS,EAAE',
+			names: [],
+			sourceRoot: 'webpack://',
+			sources: [ '/./folder/test.css' ],
+			sourcesContent: [ '.class { a: b c d; }' ],
+			version: 3
+		}]
+	]);
+	testMap("generate sourceMap (1 loader, relative)", ".class { a: b c d; }", undefined, {
+		loaders: [{request: "/path/css-loader"}],
+		options: { context: "/other-folder/sub" },
+		resource: "/folder/test.css",
+		request: "/path/css-loader!/folder/test.css",
+		query: "?sourceMap"
+	}, [
+		[1, ".class { a: b c d; }", "", {
+			file: 'test.css',
+			mappings: 'AAAA,SAAS,SAAS,EAAE',
+			names: [],
+			sourceRoot: 'webpack://',
+			sources: [ '/../../folder/test.css' ],
+			sourcesContent: [ '.class { a: b c d; }' ],
+			version: 3
+		}]
+	]);
+	testMap("generate sourceMap (2 loaders)", ".class { a: b c d; }", undefined, {
+		loaders: [{request: "/path/css-loader"}, {request: "/path/sass-loader"}],
+		options: { context: "/" },
+		resource: "/folder/test.scss",
+		request: "/path/css-loader!/path/sass-loader!/folder/test.scss",
+		query: "?sourceMap"
+	}, [
+		[1, ".class { a: b c d; }", "", {
+			file: 'test.scss',
+			mappings: 'AAAA,SAAS,SAAS,EAAE',
+			names: [],
+			sourceRoot: 'webpack://',
+			sources: [ '/./folder/test.scss' ],
+			sourcesContent: [ '.class { a: b c d; }' ],
+			version: 3
+		}]
+	]);
 });