pkg/docgen: moved model classes into minilibs

pkg/docgen/lib/src/models.dart

Index: pkg/docgen/lib/src/models.dart
diff --git a/pkg/docgen/lib/src/models.dart b/pkg/docgen/lib/src/models.dart
index e0aa9dc86aadcf0fded42b3eef4ab239d8646fb0..ad61145741b388856c85c8eb42c54a794eefca1f 100644
--- a/pkg/docgen/lib/src/models.dart
+++ b/pkg/docgen/lib/src/models.dart
@@ -4,1069 +4,10 @@
 
 library docgen.models;
 
-import 'dart:io';
-
-import 'package:markdown/markdown.dart' as markdown;
-
-import '../../../../sdk/lib/_internal/compiler/implementation/mirrors/source_mirrors.dart';
-import '../../../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors_util.dart'
-    as dart2js_util;
-import '../../../../sdk/lib/_internal/compiler/implementation/mirrors/dart2js_mirrors.dart'
-    as dart2js_mirrors;
-
-import 'library_helpers.dart';
-import 'mdn.dart';
-import 'model_helpers.dart';
-import 'package_helpers.dart';
-
-/// Docgen representation of an item to be documented, that wraps around a
-/// dart2js mirror.
-abstract class MirrorBased<TMirror extends DeclarationMirror> {
-  /// The original dart2js mirror around which this object wraps.
-  TMirror get mirror;
-
-  /// Return an informative [Object.toString] for debugging.
-  String toString() => "${super.toString()} - $mirror";
-}
-
-/// A Docgen wrapper around the dart2js mirror for a generic type.
-class Generic extends MirrorBased<TypeVariableMirror> {
-  final TypeVariableMirror mirror;
-
-  Generic(this.mirror);
-
-  Map toMap() => {
-    'name': dart2js_util.nameOf(mirror),
-    'type': dart2js_util.qualifiedNameOf(mirror.upperBound)
-  };
-}
-
-/// For types that we do not explicitly create or have not yet created in our
-/// entity map (like core types).
-class DummyMirror implements Indexable {
-  final DeclarationMirror mirror;
-  /// The library that contains this element, if any. Used as a hint to help
-  /// determine which object we're referring to when looking up this mirror in
-  /// our map.
-  final Indexable owner;
-  DummyMirror(this.mirror, [this.owner]);
-
-  String get docName {
-    if (mirror == null) return '';
-    if (mirror is LibraryMirror) {
-      return dart2js_util.qualifiedNameOf(mirror).replaceAll('.','-');
-    }
-    var mirrorOwner = mirror.owner;
-    if (mirrorOwner == null) return dart2js_util.qualifiedNameOf(mirror);
-    var simpleName = dart2js_util.nameOf(mirror);
-    if (mirror is MethodMirror && (mirror as MethodMirror).isConstructor) {
-      // We name constructors specially -- repeating the class name and a
-      // "-" to separate the constructor from its name (if any).
-      simpleName = '${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());
-  }
-}
-
-/// An item that is categorized in our mirrorToDocgen map, as a distinct,
-/// searchable element.
-///
-/// These are items that refer to concrete entities (a Class, for example,
-/// but not a Type, which is a "pointer" to a class) that we wish to be
-/// globally resolvable. This includes things such as class methods and
-/// variables, but parameters for methods are not "Indexable" as we do not want
-/// the user to be able to search for a method based on its parameter names!
-/// The set of indexable items also includes Typedefs, since the user can refer
-/// to them as concrete entities in a particular scope.
-abstract class Indexable<TMirror extends DeclarationMirror>
-    extends MirrorBased<TMirror> {
-
-  Library get owningLibrary => owner.owningLibrary;
-
-  String get qualifiedName => fileName;
-  final TMirror mirror;
-  final bool isPrivate;
-  /// The comment text pre-resolution. We keep this around because inherited
-  /// methods need to resolve links differently from the superclass.
-  String _unresolvedComment = '';
-
-  Indexable(TMirror mirror)
-      : this.mirror = mirror,
-        this.isPrivate = isHidden(mirror) {
-
-    var map = mirrorToDocgen[dart2js_util.qualifiedNameOf(this.mirror)];
-    if (map == null) map = new Map<String, Set<Indexable>>();
-
-    var set = map[owner.docName];
-    if (set == null) set = new Set<Indexable>();
-    set.add(this);
-    map[owner.docName] = set;
-    mirrorToDocgen[dart2js_util.qualifiedNameOf(this.mirror)] = map;
-  }
-
-  /// Returns this object's qualified name, but following the conventions
-  /// we're using in Dartdoc, which is that library names with dots in them
-  /// have them replaced with hyphens.
-  String get docName;
-
-  /// Converts all [foo] references in comments to <a>libraryName.foo</a>.
-  markdown.Node fixReference(String name) {
-    // Attempt the look up the whole name up in the scope.
-    String elementName = findElementInScope(name);
-    if (elementName != null) {
-      return new markdown.Element.text('a', elementName);
-    }
-    return fixComplexReference(name);
-  }
-
-  /// Look for the specified name starting with the current member, and
-  /// progressively working outward to the current library scope.
-  String findElementInScope(String name) =>
-      findElementInScopeWithPrefix(name, packagePrefix);
-
-  /// The reference to this element based on where it is printed as a
-  /// documentation file and also the unique URL to refer to this item.
-  ///
-  /// The qualified name (for URL purposes) and the file name are the same,
-  /// of the form packageName/ClassName or packageName/ClassName.methodName.
-  /// This defines both the URL and the directory structure.
-  String get fileName =>  packagePrefix + ownerPrefix + name;
-
-  /// The full docName of the owner element, appended with a '.' for this
-  /// object's name to be appended.
-  String get ownerPrefix => owner.docName != '' ? owner.docName + '.' : '';
-
-  /// The prefix String to refer to the package that this item is in, for URLs
-  /// and comment resolution.
-  ///
-  /// The prefix can be prepended to a qualified name to get a fully unique
-  /// name among all packages.
-  String get packagePrefix => '';
-
-  /// Documentation comment with converted markdown and all links resolved.
-  String _comment;
-
-  /// Accessor to documentation comment with markdown converted to html and all
-  /// links resolved.
-  String get comment {
-    if (_comment != null) return _comment;
-
-    _comment = _commentToHtml();
-    if (_comment.isEmpty) {
-      _comment = _mdnComment();
-    }
-    return _comment;
-  }
-
-  void set comment(x) {
-    _comment = x;
-  }
-
-  /// The simple name to refer to this item.
-  String get name => dart2js_util.nameOf(mirror);
-
-  /// Accessor to the parent item that owns this item.
-  ///
-  /// "Owning" is defined as the object one scope-level above which this item
-  /// is defined. Ex: The owner for a top level class, would be its enclosing
-  /// library. The owner of a local variable in a method would be the enclosing
-  /// method.
-  Indexable get owner => new DummyMirror(mirror.owner);
-
-  /// Generates MDN comments from database.json.
-  String _mdnComment();
-
-  /// The type of this member to be used in index.txt.
-  String get typeName => '';
-
-  /// Creates a [Map] with this [Indexable]'s name and a preview comment.
-  Map get previewMap {
-    var finalMap = { 'name' : name, 'qualifiedName' : qualifiedName };
-    var preview = _preview;
-    if(preview != null) finalMap['preview'] = preview;
-    return finalMap;
-  }
-
-  String get _preview {
-    if (comment != '') {
-      var index = comment.indexOf('</p>');
-      return index > 0 ?
-          '${comment.substring(0, index)}</p>' :
-          '<p><i>Comment preview not available</i></p>';
-    }
-    return null;
-  }
-
-  /// Accessor to obtain the raw comment text for a given item, _without_ any
-  /// of the links resolved.
-  String get _commentText {
-    String commentText;
-    mirror.metadata.forEach((metadata) {
-      if (metadata is CommentInstanceMirror) {
-        CommentInstanceMirror comment = metadata;
-        if (comment.isDocComment) {
-          if (commentText == null) {
-            commentText = comment.trimmedText;
-          } else {
-            commentText = '$commentText\n${comment.trimmedText}';
-          }
-        }
-      }
-    });
-    return commentText;
-  }
-
-  /// Returns any documentation comments associated with a mirror with
-  /// simple markdown converted to html.
-  ///
-  /// By default we resolve any comment references within our own scope.
-  /// However, if a method is inherited, we want the inherited comments, but
-  /// links to the subclasses's version of the methods.
-  String _commentToHtml([Indexable resolvingScope]) {
-    if (resolvingScope == null) resolvingScope = this;
-    var commentText = _commentText;
-    _unresolvedComment = commentText;
-
-    var linkResolver = (name) => resolvingScope.fixReference(name);
-    commentText = commentText == null ? '' :
-        markdown.markdownToHtml(commentText.trim(), linkResolver: linkResolver,
-            inlineSyntaxes: MARKDOWN_SYNTAXES);
-    return commentText;
-  }
-
-  /// Return a map representation of this type.
-  Map toMap();
-
-  /// Expand the method map [mapToExpand] into a more detailed map that
-  /// separates out setters, getters, constructors, operators, and methods.
-  Map _expandMethodMap(Map<String, Method> mapToExpand) => {
-    'setters': recurseMap(filterMap(mapToExpand,
-        (key, val) => val.mirror.isSetter)),
-    'getters': recurseMap(filterMap(mapToExpand,
-        (key, val) => val.mirror.isGetter)),
-    'constructors': recurseMap(filterMap(mapToExpand,
-        (key, val) => val.mirror.isConstructor)),
-    'operators': recurseMap(filterMap(mapToExpand,
-        (key, val) => val.mirror.isOperator)),
-    'methods': recurseMap(filterMap(mapToExpand,
-        (key, val) => val.mirror.isRegularMethod && !val.mirror.isOperator))
-  };
-
-  /// Accessor to determine if this item and all of its owners are visible.
-  bool get isVisible => isFullChainVisible(this);
-
-  /// Returns true if [mirror] is the correct type of mirror that this Docgen
-  /// object wraps. (Workaround for the fact that Types are not first class.)
-  bool isValidMirror(DeclarationMirror mirror);
-}
-
-/// A class containing contents of a Dart library.
-class Library extends Indexable {
-  final Map<String, Class> classes = {};
-  final Map<String, Typedef> typedefs = {};
-  final Map<String, Class> errors = {};
-
-  /// Top-level variables in the library.
-  Map<String, Variable> variables;
-
-  /// Top-level functions in the library.
-  Map<String, Method> functions;
-
-  String packageName = '';
-  bool _hasBeenCheckedForPackage = false;
-  String packageIntro;
-
-  Library get owningLibrary => this;
-
-  /// Returns the [Library] for the given [mirror] if it has already been
-  /// created, else creates it.
-  factory Library(LibraryMirror mirror) {
-    var library = getDocgenObject(mirror);
-    if (library is DummyMirror) {
-      library = new Library._(mirror);
-    }
-    return library;
-  }
-
-  Library._(LibraryMirror libraryMirror) : super(libraryMirror) {
-    var exported = calcExportedItems(libraryMirror);
-    var exportedClasses = addAll(exported['classes'],
-        dart2js_util.typesOf(libraryMirror.declarations));
-    updateLibraryPackage(mirror);
-    exportedClasses.forEach((String mirrorName, TypeMirror mirror) {
-        if (mirror is TypedefMirror) {
-          // This is actually a Dart2jsTypedefMirror, and it does define value,
-          // but we don't have visibility to that type.
-          if (includePrivateMembers || !mirror.isPrivate) {
-            typedefs[dart2js_util.nameOf(mirror)] = new Typedef(mirror, this);
-          }
-        } else if (mirror is ClassMirror) {
-          var clazz = new Class(mirror, this);
-
-          if (clazz.isError()) {
-            errors[dart2js_util.nameOf(mirror)] = clazz;
-          } else {
-            classes[dart2js_util.nameOf(mirror)] = clazz;
-          }
-        } else {
-          throw new ArgumentError(
-              '${dart2js_util.nameOf(mirror)} - no class type match. ');
-        }
-    });
-    this.functions = createMethods(addAll(exported['methods'],
-        libraryMirror.declarations.values.where(
-            (mirror) => mirror is MethodMirror)).values, this);
-    this.variables = createVariables(addAll(exported['variables'],
-        dart2js_util.variablesOf(libraryMirror.declarations)).values, this);
-  }
-
-  /// Look for the specified name starting with the current member, and
-  /// progressively working outward to the current library scope.
-  String findElementInScope(String name) {
-    var lookupFunc = determineLookupFunc(name);
-    var libraryScope = lookupFunc(mirror, name);
-    if (libraryScope != null) {
-      var result = getDocgenObject(libraryScope, this);
-      if (result is DummyMirror) return packagePrefix + result.docName;
-      return result.packagePrefix + result.docName;
-    }
-    return super.findElementInScope(name);
-  }
-
-  String _mdnComment() => '';
-
-  /// For a library's [mirror], determine the name of the package (if any) we
-  /// believe it came from (because of its file URI).
-  ///
-  /// If no package could be determined, we return an empty string.
-  void updateLibraryPackage(LibraryMirror mirror) {
-    if (mirror == null) return;
-    if (_hasBeenCheckedForPackage) return;
-    _hasBeenCheckedForPackage = true;
-    if (mirror.uri.scheme != 'file') return;
-    packageName = getPackageName(mirror);
-    // Associate the package readme with all the libraries. This is a bit
-    // wasteful, but easier than trying to figure out which partial match
-    // is best.
-    packageIntro = _packageIntro(getPackageDirectory(mirror));
-  }
-
-  String _packageIntro(packageDir) {
-    if (packageDir == null) return null;
-    var dir = new Directory(packageDir);
-    var files = dir.listSync();
-    var readmes = files.where((FileSystemEntity each) => (each is File &&
-        each.path.substring(packageDir.length + 1, each.path.length)
-          .startsWith('README'))).toList();
-    if (readmes.isEmpty) return '';
-    // If there are multiples, pick the shortest name.
-    readmes.sort((a, b) => a.path.length.compareTo(b.path.length));
-    var readme = readmes.first;
-    var linkResolver = (name) => globalFixReference(name);
-    var contents = markdown.markdownToHtml(readme
-      .readAsStringSync(), linkResolver: linkResolver,
-      inlineSyntaxes: MARKDOWN_SYNTAXES);
-    return contents;
-  }
-
-  String get packagePrefix => packageName == null || packageName.isEmpty ?
-      '' : '$packageName/';
-
-  Map get previewMap {
-    var map = {'packageName': packageName};
-    map.addAll(super.previewMap);
-    if (packageIntro != null) {
-      map['packageIntro'] = packageIntro;
-    }
-    return map;
-  }
-
-  String get name => docName;
-
-  String get docName {
-    return dart2js_util.qualifiedNameOf(mirror).replaceAll('.','-');
-  }
-
-  /// Checks if the given name is a key for any of the Class Maps.
-  bool containsKey(String name) =>
-      classes.containsKey(name) || errors.containsKey(name);
-
-  /// Generates a map describing the [Library] object.
-  Map toMap() => {
-    'name': name,
-    'qualifiedName': qualifiedName,
-    'comment': comment,
-    'variables': recurseMap(variables),
-    'functions': _expandMethodMap(functions),
-    'classes': {
-      'class': classes.values.where((c) => c.isVisible)
-        .map((e) => e.previewMap).toList(),
-      'typedef': recurseMap(typedefs),
-      'error': errors.values.where((e) => e.isVisible)
-          .map((e) => e.previewMap).toList()
-    },
-    'packageName': packageName,
-    'packageIntro' : packageIntro
-  };
-
-  String get typeName => 'library';
-
-  bool isValidMirror(DeclarationMirror mirror) => mirror is LibraryMirror;
-}
-
-abstract class OwnedIndexable<TMirror extends DeclarationMirror>
-    extends Indexable<TMirror> {
-  /// List of the meta annotations on this item.
-  final List<Annotation> annotations;
-
-  /// The object one scope-level above which this item is defined.
-  ///
-  /// Ex: The owner for a top level class, would be its enclosing library.
-  /// The owner of a local variable in a method would be the enclosing method.
-  final Indexable owner;
-
-  /// Returns this object's qualified name, but following the conventions
-  /// we're using in Dartdoc, which is that library names with dots in them
-  /// have them replaced with hyphens.
-  String get docName => owner.docName + '.' + dart2js_util.nameOf(mirror);
-
-  OwnedIndexable(DeclarationMirror mirror, Indexable owner)
-      : annotations = createAnnotations(mirror, owner.owningLibrary),
-        this.owner = owner,
-        super(mirror);
-
-  /// Generates MDN comments from database.json.
-  String _mdnComment() {
-    var domAnnotation = this.annotations.firstWhere(
-        (e) => e.mirror.qualifiedName == #metadata.DomName,
-        orElse: () => null);
-    if (domAnnotation == null) return '';
-    var domName = domAnnotation.parameters.single;
-
-    return mdnComment(rootDirectory, logger, domName);
-  }
-
-  String get packagePrefix => owner.packagePrefix;
-}
-
-/// A class containing contents of a Dart class.
-class Class extends OwnedIndexable<dart2js_mirrors.Dart2JsInterfaceTypeMirror>
-    implements Comparable<Class> {
-
-  /// List of the names of interfaces that this class implements.
-  List<Class> interfaces = [];
-
-  /// Names of classes that extends or implements this class.
-  Set<Class> subclasses = new Set<Class>();
-
-  /// Top-level variables in the class.
-  Map<String, Variable> variables;
-
-  /// Inherited variables in the class.
-  final Map<String, Variable> inheritedVariables = {};
-
-  /// Methods in the class.
-  Map<String, Method> methods;
-
-  final Map<String, Method> inheritedMethods = new Map<String, Method>();
-
-  /// Generic infomation about the class.
-  final Map<String, Generic> generics;
-
-  Class superclass;
-  bool get isAbstract => mirror.isAbstract;
-
-  /// Make sure that we don't check for inherited comments more than once.
-  bool _commentsEnsured = false;
-
-  /// Returns the [Class] for the given [mirror] if it has already been created,
-  /// else creates it.
-  factory Class(ClassMirror mirror, Library owner) {
-    var clazz = getDocgenObject(mirror, owner);
-    if (clazz is DummyMirror) {
-      clazz = new Class._(mirror, owner);
-    }
-    return clazz;
-  }
-
-  /// Called when we are constructing a superclass or interface class, but it
-  /// is not known if it belongs to the same owner as the original class. In
-  /// this case, we create an object whose owner is what the original mirror
-  /// says it is.
-  factory Class._possiblyDifferentOwner(ClassMirror mirror,
-      Library originalOwner) {
-    if (mirror.owner is LibraryMirror) {
-      var realOwner = getDocgenObject(mirror.owner);
-      if (realOwner is Library) {
-        return new Class(mirror, realOwner);
-      } else {
-        return new Class(mirror, originalOwner);
-      }
-    } else {
-      return new Class(mirror, originalOwner);
-    }
-  }
-
-  Class._(ClassSourceMirror classMirror, Indexable owner)
-      : generics = createGenerics(classMirror),
-        super(classMirror, owner) {
-
-    // The reason we do this madness is the superclass and interface owners may
-    // not be this class's owner!! Example: BaseClient in http pkg.
-    var superinterfaces = classMirror.superinterfaces.map(
-        (interface) => new Class._possiblyDifferentOwner(interface, owner));
-    this.superclass = classMirror.superclass == null? null :
-        new Class._possiblyDifferentOwner(classMirror.superclass, owner);
-
-    interfaces = superinterfaces.toList();
-    variables = createVariables(
-        dart2js_util.variablesOf(classMirror.declarations), this);
-    methods = createMethods(classMirror.declarations.values.where(
-        (mirror) => mirror is MethodMirror), this);
-
-    // Tell superclass that you are a subclass, unless you are not
-    // visible or an intermediary mixin class.
-    if (!classMirror.isNameSynthetic && isVisible && superclass != null) {
-      superclass.addSubclass(this);
-    }
-
-    if (this.superclass != null) addInherited(superclass);
-    interfaces.forEach((interface) => addInherited(interface));
-  }
-
-  String _lookupInClassAndSuperclasses(String name) {
-    var lookupFunc = determineLookupFunc(name);
-    var classScope = this;
-    while (classScope != null) {
-      var classFunc = lookupFunc(classScope.mirror, name);
-      if (classFunc != null) {
-        return packagePrefix + getDocgenObject(classFunc, owner).docName;
-      }
-      classScope = classScope.superclass;
-    }
-    return null;
-  }
-
-  /// Look for the specified name starting with the current member, and
-  /// progressively working outward to the current library scope.
-  String findElementInScope(String name) {
-    var lookupFunc = determineLookupFunc(name);
-    var result = _lookupInClassAndSuperclasses(name);
-    if (result != null) {
-      return result;
-    }
-    result = owner.findElementInScope(name);
-    return result == null ? super.findElementInScope(name) : result;
-  }
-
-  String get typeName => 'class';
-
-  /// Add all inherited variables and methods from the provided superclass.
-  /// If [_includePrivate] is true, it also adds the variables and methods from
-  /// the superclass.
-  void addInherited(Class superclass) {
-    inheritedVariables.addAll(superclass.inheritedVariables);
-    inheritedVariables.addAll(_allButStatics(superclass.variables));
-    addInheritedMethod(superclass, this);
-  }
-
-  /** [newParent] refers to the actual class is currently using these methods.
-   * which may be different because with the mirror system, we only point to the
-   * original canonical superclasse's method.
-   */
-  void addInheritedMethod(Class parent, Class newParent) {
-    parent.inheritedMethods.forEach((name, method) {
-      if(!method.mirror.isConstructor){
-        inheritedMethods[name] = new Method(method.mirror, newParent, method);
-      }}
-    );
-    _allButStatics(parent.methods).forEach((name, method) {
-      if (!method.mirror.isConstructor) {
-        inheritedMethods[name] = new Method(method.mirror, newParent, method);
-      }}
-    );
-  }
-
-  /// Remove statics from the map of inherited items before adding them.
-  Map _allButStatics(Map items) {
-    var result = {};
-    items.forEach((name, item) {
-      if (!item.isStatic) {
-        result[name] = item;
-      }
-    });
-    return result;
-  }
-
-  /// Add the subclass to the class.
-  ///
-  /// If [this] is private (or an intermediary mixin class), it will add the
-  /// subclass to the list of subclasses in the superclasses.
-  void addSubclass(Class subclass) {
-    if (docName == 'dart-core.Object') return;
-
-    if (!includePrivateMembers && isPrivate || mirror.isNameSynthetic) {
-      if (superclass != null) superclass.addSubclass(subclass);
-      interfaces.forEach((interface) {
-        interface.addSubclass(subclass);
-      });
-    } else {
-      subclasses.add(subclass);
-    }
-  }
-
-  /// Check if this [Class] is an error or exception.
-  bool isError() {
-    if (qualifiedName == 'dart-core.Error' ||
-        qualifiedName == 'dart-core.Exception')
-      return true;
-    for (var interface in interfaces) {
-      if (interface.isError()) return true;
-    }
-    if (superclass == null) return false;
-    return superclass.isError();
-  }
-
-  /// Makes sure that all methods with inherited equivalents have comments.
-  void ensureComments() {
-    if (_commentsEnsured) return;
-    _commentsEnsured = true;
-    if (superclass != null) superclass.ensureComments();
-    inheritedMethods.forEach((qualifiedName, inheritedMethod) {
-      var method = methods[qualifiedName];
-      if (method != null) {
-        // if we have overwritten this method in this class, we still provide
-        // the opportunity to inherit the comments.
-        method.ensureCommentFor(inheritedMethod);
-      }
-    });
-    // we need to populate the comments for all methods. so that the subclasses
-    // can get for their inherited versions the comments.
-    methods.forEach((qualifiedName, method) {
-      if (!method.mirror.isConstructor) method.ensureCommentFor(method);
-    });
-  }
-
-  /// If a class extends a private superclass, find the closest public
-  /// superclass of the private superclass.
-  String validSuperclass() {
-    if (superclass == null) return 'dart-core.Object';
-    if (superclass.isVisible) return superclass.qualifiedName;
-    return superclass.validSuperclass();
-  }
-
-  /// Generates a map describing the [Class] object.
-  Map toMap() => {
-    'name': name,
-    'qualifiedName': qualifiedName,
-    'comment': comment,
-    'isAbstract' : isAbstract,
-    'superclass': validSuperclass(),
-    'implements': interfaces.where((i) => i.isVisible)
-        .map((e) => e.qualifiedName).toList(),
-    'subclass': (subclasses.toList()..sort())
-        .map((x) => x.qualifiedName).toList(),
-    'variables': recurseMap(variables),
-    'inheritedVariables': recurseMap(inheritedVariables),
-    'methods': _expandMethodMap(methods),
-    'inheritedMethods': _expandMethodMap(inheritedMethods),
-    'annotations': annotations.map((a) => a.toMap()).toList(),
-    'generics': recurseMap(generics)
-  };
-
-  int compareTo(Class other) => name.compareTo(other.name);
-
-  bool isValidMirror(DeclarationMirror mirror) => mirror is ClassMirror;
-}
-
-class Typedef extends OwnedIndexable {
-  final String returnType;
-
-  final Map<String, Parameter> parameters;
-
-  /// Generic information about the typedef.
-  final Map<String, Generic> generics;
-
-  /// Returns the [Library] for the given [mirror] if it has already been
-  /// created, else creates it.
-  factory Typedef(TypedefMirror mirror, Library owningLibrary) {
-    var aTypedef = getDocgenObject(mirror, owningLibrary);
-    if (aTypedef is DummyMirror) {
-      aTypedef = new Typedef._(mirror, owningLibrary);
-    }
-    return aTypedef;
-  }
-
-  Typedef._(TypedefMirror mirror, Library owningLibrary)
-      : returnType = getDocgenObject(mirror.referent.returnType).docName,
-        generics = createGenerics(mirror),
-        parameters = createParameters(mirror.referent.parameters,
-            owningLibrary),
-        super(mirror, owningLibrary);
-
-  Map toMap() {
-    var map = {
-      'name': name,
-      'qualifiedName': qualifiedName,
-      'comment': comment,
-      'return': returnType,
-      'parameters': recurseMap(parameters),
-      'annotations': annotations.map((a) => a.toMap()).toList(),
-      'generics': recurseMap(generics)
-    };
-
-    // Typedef is displayed on the library page as a class, so a preview is
-    // added manually
-    var preview = _preview;
-    if(preview != null) map['preview'] = preview;
-
-    return map;
-  }
-
-  markdown.Node fixReference(String name) => null;
-
-  String get typeName => 'typedef';
-
-  bool isValidMirror(DeclarationMirror mirror) => mirror is TypedefMirror;
-}
-
-/// A class containing properties of a Dart variable.
-class Variable extends OwnedIndexable {
-
-  bool isFinal;
-  bool isStatic;
-  bool isConst;
-  Type type;
-  String _variableName;
-
-  factory Variable(String variableName, VariableMirror mirror,
-      Indexable owner) {
-    var variable = getDocgenObject(mirror);
-    if (variable is DummyMirror) {
-      return new Variable._(variableName, mirror, owner);
-    }
-    return variable;
-  }
-
-  Variable._(this._variableName, VariableMirror mirror, Indexable owner) :
-      super(mirror, owner) {
-    isFinal = mirror.isFinal;
-    isStatic = mirror.isStatic;
-    isConst = mirror.isConst;
-    type = new Type(mirror.type, owner.owningLibrary);
-  }
-
-  String get name => _variableName;
-
-  /// Generates a map describing the [Variable] object.
-  Map toMap() => {
-    'name': name,
-    'qualifiedName': qualifiedName,
-    'comment': comment,
-    'final': isFinal,
-    'static': isStatic,
-    'constant': isConst,
-    'type': new List.filled(1, type.toMap()),
-    'annotations': annotations.map((a) => a.toMap()).toList()
-  };
-
-  String get typeName => 'property';
-
-  get comment {
-    if (_comment != null) return _comment;
-    if (owner is Class) {
-      (owner as Class).ensureComments();
-    }
-    return super.comment;
-  }
-
-  String findElementInScope(String name) {
-    var lookupFunc = determineLookupFunc(name);
-    var result = lookupFunc(mirror, name);
-    if (result != null) {
-      result = getDocgenObject(result);
-      if (result is DummyMirror) return packagePrefix + result.docName;
-      return result.packagePrefix + result.docName;
-    }
-
-    if (owner != null) {
-      var result = owner.findElementInScope(name);
-      if (result != null) {
-        return result;
-      }
-    }
-    return super.findElementInScope(name);
-  }
-
-  bool isValidMirror(DeclarationMirror mirror) => mirror is VariableMirror;
-}
-
-/// A class containing properties of a Dart method.
-class Method extends OwnedIndexable {
-
-  /// Parameters for this method.
-  final Map<String, Parameter> parameters;
-
-  final bool isStatic;
-  final bool isAbstract;
-  final bool isConst;
-  final Type returnType;
-  Method methodInheritedFrom;
-
-  /// Qualified name to state where the comment is inherited from.
-  String commentInheritedFrom = "";
-
-  factory Method(MethodMirror mirror, Indexable owner,
-      [Method methodInheritedFrom]) {
-    var method = getDocgenObject(mirror, owner);
-    if (method is DummyMirror) {
-      method = new Method._(mirror, owner, methodInheritedFrom);
-    }
-    return method;
-  }
-
-  Method._(MethodMirror mirror, Indexable owner, this.methodInheritedFrom)
-      : returnType = new Type(mirror.returnType, owner.owningLibrary),
-        isStatic = mirror.isStatic,
-        isAbstract = mirror.isAbstract,
-        isConst = mirror.isConstConstructor,
-        parameters = createParameters(mirror.parameters, owner),
-        super(mirror, owner);
-
-  Method get originallyInheritedFrom => methodInheritedFrom == null ?
-      this : methodInheritedFrom.originallyInheritedFrom;
-
-  /// Look for the specified name starting with the current member, and
-  /// progressively working outward to the current library scope.
-  String findElementInScope(String name) {
-    var lookupFunc = determineLookupFunc(name);
-
-    var memberScope = lookupFunc(this.mirror, name);
-    if (memberScope != null) {
-      // do we check for a dummy mirror returned here and look up with an owner
-      // higher ooooor in getDocgenObject do we include more things in our
-      // lookup
-      var result = getDocgenObject(memberScope, owner);
-      if (result is DummyMirror && owner.owner != null
-          && owner.owner is! DummyMirror) {
-        var aresult = getDocgenObject(memberScope, owner.owner);
-        if (aresult is! DummyMirror) result = aresult;
-      }
-      if (result is DummyMirror) return packagePrefix + result.docName;
-      return result.packagePrefix + result.docName;
-    }
-
-    if (owner != null) {
-      var result = owner.findElementInScope(name);
-      if (result != null) return result;
-    }
-    return super.findElementInScope(name);
-  }
-
-  String get docName {
-    if ((mirror as MethodMirror).isConstructor) {
-      // We name constructors specially -- including the class name again and a
-      // "-" to separate the constructor from its name (if any).
-      return '${owner.docName}.${dart2js_util.nameOf(mirror.owner)}-'
-             '${dart2js_util.nameOf(mirror)}';
-    }
-    return super.docName;
-  }
-
-  String get fileName => packagePrefix + docName;
-
-  /// Makes sure that the method with an inherited equivalent have comments.
-  void ensureCommentFor(Method inheritedMethod) {
-    if (comment.isNotEmpty) return;
-
-    comment = inheritedMethod._commentToHtml(this);
-    _unresolvedComment = inheritedMethod._unresolvedComment;
-    commentInheritedFrom = inheritedMethod.commentInheritedFrom == '' ?
-        new DummyMirror(inheritedMethod.mirror).docName :
-        inheritedMethod.commentInheritedFrom;
-  }
-
-  /// Generates a map describing the [Method] object.
-  Map toMap() => {
-    'name': name,
-    'qualifiedName': qualifiedName,
-    'comment': comment,
-    'commentFrom': (methodInheritedFrom != null &&
-        commentInheritedFrom == methodInheritedFrom.docName ? ''
-        : commentInheritedFrom),
-    'inheritedFrom': (methodInheritedFrom == null? '' :
-        originallyInheritedFrom.docName),
-    'static': isStatic,
-    'abstract': isAbstract,
-    'constant': isConst,
-    'return': [returnType.toMap()],
-    'parameters': recurseMap(parameters),
-    'annotations': annotations.map((a) => a.toMap()).toList()
-  };
-
-  String get typeName {
-    MethodMirror theMirror = mirror;
-    if (theMirror.isConstructor) return 'constructor';
-    if (theMirror.isGetter) return 'getter';
-    if (theMirror.isSetter) return'setter';
-    if (theMirror.isOperator) return 'operator';
-    return 'method';
-  }
-
-  get comment {
-    if (_comment != null) return _comment;
-    if (owner is Class) {
-      (owner as Class).ensureComments();
-    }
-    var result = super.comment;
-    if (result == '' && methodInheritedFrom != null) {
-      // This should be NOT from the MIRROR, but from the COMMENT.
-      methodInheritedFrom.comment; // Ensure comment field has been populated.
-      _unresolvedComment = methodInheritedFrom._unresolvedComment;
-
-      var linkResolver = (name) => fixReference(name);
-      comment = _unresolvedComment == null ? '' :
-        markdown.markdownToHtml(_unresolvedComment.trim(),
-            linkResolver: linkResolver, inlineSyntaxes: MARKDOWN_SYNTAXES);
-      commentInheritedFrom = comment != '' ?
-          methodInheritedFrom.commentInheritedFrom : '';
-      result = comment;
-    }
-    return result;
-  }
-
-  bool isValidMirror(DeclarationMirror mirror) => mirror is MethodMirror;
-}
-
-/// Docgen wrapper around the dart2js mirror for a Dart
-/// method/function parameter.
-class Parameter extends MirrorBased {
-  final ParameterMirror mirror;
-  final String name;
-  final bool isOptional;
-  final bool isNamed;
-  final bool hasDefaultValue;
-  final Type type;
-  final String defaultValue;
-  /// List of the meta annotations on the parameter.
-  final List<Annotation> annotations;
-
-  Parameter(ParameterMirror mirror, Library owningLibrary)
-      : this.mirror = mirror,
-        name = dart2js_util.nameOf(mirror),
-        isOptional = mirror.isOptional,
-        isNamed = mirror.isNamed,
-        hasDefaultValue = mirror.hasDefaultValue,
-        defaultValue = getDefaultValue(mirror),
-        type = new Type(mirror.type, owningLibrary),
-        annotations = createAnnotations(mirror, owningLibrary);
-
-  /// Generates a map describing the [Parameter] object.
-  Map toMap() => {
-    'name': name,
-    'optional': isOptional,
-    'named': isNamed,
-    'default': hasDefaultValue,
-    'type': new List.filled(1, type.toMap()),
-    'value': defaultValue,
-    'annotations': annotations.map((a) => a.toMap()).toList()
-  };
-}
-
-/// Docgen wrapper around the mirror for a return type, and/or its generic
-/// type parameters.
-///
-/// Return types are of a form [outer]<[inner]>.
-/// If there is no [inner] part, [inner] will be an empty list.
-///
-/// For example:
-///        int size()
-///          "return" :
-///            - "outer" : "dart-core.int"
-///              "inner" :
-///
-///        List<String> toList()
-///          "return" :
-///            - "outer" : "dart-core.List"
-///              "inner" :
-///                - "outer" : "dart-core.String"
-///                  "inner" :
-///
-///        Map<String, List<int>>
-///          "return" :
-///            - "outer" : "dart-core.Map"
-///              "inner" :
-///                - "outer" : "dart-core.String"
-///                  "inner" :
-///                - "outer" : "dart-core.List"
-///                  "inner" :
-///                    - "outer" : "dart-core.int"
-///                      "inner" :
-class Type extends MirrorBased {
-  final TypeMirror mirror;
-  final Library owningLibrary;
-
-  Type(this.mirror, this.owningLibrary);
-
-  Map toMap() {
-    var result = getDocgenObject(mirror, owningLibrary);
-    return {
-      // We may encounter types whose corresponding library has not been
-      // processed yet, so look up with the owningLibrary at the last moment.
-      'outer': result.packagePrefix + result.docName,
-      'inner': _createTypeGenerics(mirror).map((e) => e.toMap()).toList(),
-    };
-  }
-
-  /// Returns a list of [Type] objects constructed from TypeMirrors.
-  List<Type> _createTypeGenerics(TypeMirror mirror) {
-    if (mirror is! ClassMirror) return [];
-    return mirror.typeArguments.map((e) => new Type(e, owningLibrary)).toList();
-  }
-}
-
-/// Holds the name of the annotation, and its parameters.
-class Annotation extends MirrorBased {
-  /// The class of this annotation.
-  final ClassMirror mirror;
-  final Library owningLibrary;
-  List<String> parameters;
-
-  Annotation(InstanceMirror originalMirror, this.owningLibrary)
-      : mirror = originalMirror.type {
-    parameters = dart2js_util.variablesOf(originalMirror.type.declarations)
-        .where((e) => e.isFinal)
-        .map((e) => originalMirror.getField(e.simpleName).reflectee)
-        .where((e) => e != null)
-        .toList();
-  }
-
-  Map toMap() => {
-    'name': getDocgenObject(mirror, owningLibrary).docName,
-    'parameters': parameters
-  };
-}
+export 'models/class.dart';
+export 'models/indexable.dart';
+export 'models/library.dart';
+export 'models/method.dart';
+export 'models/parameter.dart';
+export 'models/typedef.dart';
+export 'models/variable.dart';