Use '--source-map' and '--out' options to support source maps from non-commandline.

tests/compiler/dart2js/source_map_test.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Test that options '--source-map' and '--out' correctly adds
+// `sourceMappingURL` and "file" attributes to source file and source map file.
+
+library test.source_map;
+
+import 'package:async_helper/async_helper.dart';
+import 'package:expect/expect.dart';
+import 'memory_compiler.dart';
+
+const SOURCE = const {
+  '/main.dart': """
+main() {}
+""",
+};
+
+void find(String text, String substring, bool expected) {
+  bool found = text.contains(substring);
+
+  if (expected && !found) {
+    Expect.isTrue(found, 'Expected "$substring" in:\n$text');
+  }
+  if (!expected && found) {
+    Expect.isFalse(found,
+        'Unexpected "$substring" in:\n'
+        '${text.substring(text.indexOf(substring))}');
+  }
+}
+
+void test({String out, String sourceMap, String mapping, String file}) {
+  OutputCollector collector = new OutputCollector();
+  List<String> options = <String>[];
+  if (out != null) {
+    options.add("--out=$out");
+  }
+  if (sourceMap != null) {
+    options.add("--source-map=$sourceMap");
+  }
+  var compiler = compilerFor(SOURCE,
+                             showDiagnostics: true,
+                             outputProvider: collector,
+                             options: options);
+  asyncTest(() => compiler.runCompiler(Uri.parse('memory:/main.dart')).then((_) {

[floitsch, 2014/03/07 10:27:24]

long line.

[Johnni Winther, 2014/03/07 12:38:48]

Done.

+    String jsOutput = collector.getOutput('', 'js');
+    Expect.isNotNull(jsOutput);
+    if (mapping != null) {
+      find(jsOutput, '//# sourceMappingURL=$mapping', true);
+      find(jsOutput, '//@ sourceMappingURL=$mapping', true);
+    } else {
+      find(jsOutput, '//# sourceMappingURL=', false);
+      find(jsOutput, '//@ sourceMappingURL=', false);
+    }
+    String jsSourceMapOutput = collector.getOutput('', 'js.map');
+    Expect.isNotNull(jsSourceMapOutput);
+    if (file != null) {
+      find(jsSourceMapOutput, '"file": "$file"', true);
+    } else {
+      find(jsSourceMapOutput, '"file": ', false);
+    }
+  }));
+}
+
+void main() {
+  test();
+  test(sourceMap: 'file:/out.js.map');
+  test(out: 'file:/out.js');
+  test(out: 'file:/out.js', sourceMap: 'file:/out.js.map',
+       file: 'out.js', mapping: 'out.js.map');
+  test(out: 'file:/dir/out.js', sourceMap: 'file:/dir/out.js.map',
+       file: 'out.js', mapping: 'out.js.map');
+}