Implement DeclarationMirror.location for all but ParameterMirrors.

tests/lib/mirrors/class_mirror_location_test.dart

+// Copyright (c) 2015, 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.
+
+library test.class_location;
+
+import "dart:mirrors";
+import "package:expect/expect.dart";
+
+part 'class_mirror_location_other.dart';
+
+class ClassInMainFile {}
+  class SpaceIndentedInMainFile {}
+        class TabIndentedInMainFile {}
+
+abstract class AbstractClass {}
+typedef bool Predicate(num n);
+
+class M {}
+class S {}
+class MA extends S with M {}
+class MA2 = S with M;
+
+const metadata = 'metadata';
+
+@metadata
+class WithMetadata {}
+
+enum Enum { RED, GREEN, BLUE }
+
+@metadata
+enum AnnotatedEnum { SALT, PEPPER }
+
+// We only check for a suffix of the uri because the test might be run from
+// any number of absolute paths.
+expectLocation(DeclarationMirror mirror, String uriSuffix, int line, int column) {
+  Uri uri = mirror.location.sourceUri;
+  Expect.isTrue(uri.toString().endsWith(uriSuffix),
+                "Expected suffix $uriSuffix in $uri");
+  Expect.equals(line, mirror.location.line, "line");
+  Expect.equals(column, mirror.location.column, "column");
+}
+
+main() {
+  String mainSuffix = 'class_mirror_location_test.dart';
+  String otherSuffix = 'class_mirror_location_other.dart';
+
+  // This file.
+  expectLocation(reflectClass(ClassInMainFile), mainSuffix, 12, 1);
+  expectLocation(reflectClass(SpaceIndentedInMainFile), mainSuffix, 13, 3);
+  expectLocation(reflectClass(TabIndentedInMainFile), mainSuffix, 14, 2);
+  expectLocation(reflectClass(AbstractClass), mainSuffix, 16, 1);
+  expectLocation(reflectType(Predicate), mainSuffix, 17, 1);
+  expectLocation(reflectClass(MA), mainSuffix, 21, 1);
+  expectLocation(reflectClass(MA2), mainSuffix, 22, 1);
+  expectLocation(reflectClass(WithMetadata), mainSuffix, 26, 1);
+  expectLocation(reflectClass(Enum), mainSuffix, 29, 1);
+  expectLocation(reflectClass(AnnotatedEnum), mainSuffix, 31, 1);
+  
+  // Another part.
+  expectLocation(reflectClass(ClassInOtherFile), otherSuffix, 7, 1);
+  expectLocation(reflectClass(SpaceIndentedInOtherFile), otherSuffix, 9, 3);
+  expectLocation(reflectClass(TabIndentedInOtherFile), otherSuffix, 11, 2);
+
+  // Synthetic classes.
+  Expect.isNull(reflectClass(MA).superclass.location);
+  Expect.isNull((reflect(main) as ClosureMirror).type.location);
+}