pkg/docgen: moved model classes into minilibs

pkg/docgen/lib/src/models/dummy_mirror.dart

+library docgen.models.dummy_mirror;
+
+import '../exports/mirrors_util.dart' as dart2js_util;
+import '../exports/source_mirrors.dart';
+
+import '../library_helpers.dart';
+
+import 'indexable.dart';
+import 'model_helpers.dart';
+
+/// For types that we do not explicitly create or have not yet created in our
+/// entity map (like core types).
+class DummyMirror implements Indexable {
+  final DeclarationMirror mirror;
+  /// The library that contains this element, if any. Used as a hint to help
+  /// determine which object we're referring to when looking up this mirror in
+  /// our map.
+  final Indexable owner;
+  DummyMirror(this.mirror, [this.owner]);
+
+  String get docName {
+    if (mirror == null) return '';
+    if (mirror is LibraryMirror) {
+      return dart2js_util.qualifiedNameOf(mirror).replaceAll('.', '-');
+    }
+    var mirrorOwner = mirror.owner;
+    if (mirrorOwner == null) return dart2js_util.qualifiedNameOf(mirror);
+    var simpleName = dart2js_util.nameOf(mirror);
+    if (mirror is MethodMirror && (mirror as MethodMirror).isConstructor) {
+      // We name constructors specially -- repeating the class name and a
+      // "-" to separate the constructor from its name (if any).
+      simpleName = '${dart2js_util.nameOf(mirrorOwner)}-$simpleName';
+    }
+    return getDocgenObject(mirrorOwner, owner).docName + '.' +
+        simpleName;
+  }
+
+  bool get isPrivate => mirror == null ? false : mirror.isPrivate;
+
+  String get packageName {
+    var libMirror = _getOwningLibraryFromMirror(mirror);
+    if (libMirror != null) {
+      return getPackageName(libMirror);
+    }
+    return '';
+  }
+
+  String get packagePrefix => packageName == null || packageName.isEmpty ?
+      '' : '$packageName/';
+
+  LibraryMirror _getOwningLibraryFromMirror(DeclarationMirror mirror) {
+    if (mirror is LibraryMirror) return mirror;
+    if (mirror == null) return null;
+    return _getOwningLibraryFromMirror(mirror.owner);
+  }
+
+  noSuchMethod(Invocation invocation) {
+    throw new UnimplementedError(invocation.memberName.toString());
+  }
+}