pkg/docgen: continue the refactoring

pkg/docgen/lib/src/model_helpers.dart

Index: pkg/docgen/lib/src/model_helpers.dart
diff --git a/pkg/docgen/lib/src/model_helpers.dart b/pkg/docgen/lib/src/model_helpers.dart
index 95bd31725695b74235e1e49f05fd6bf3e705ac68..1c8a25521e50ec98a4a4614148852c19c41116be 100644
--- a/pkg/docgen/lib/src/model_helpers.dart
+++ b/pkg/docgen/lib/src/model_helpers.dart
@@ -11,14 +11,15 @@ import '../../../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors_ut
 import '../../../../sdk/lib/_internal/compiler/implementation/mirrors/source_mirrors.dart';
 import '../../../../sdk/lib/_internal/libraries.dart';
 
+import 'library_helpers.dart' show includePrivateMembers;
 import 'models.dart';
 import 'package_helpers.dart';
 
 /// Returns a list of meta annotations assocated with a mirror.
-List<Annotation> createAnnotations(DeclarationMirror mirror, Library
-  owningLibrary) {
-  var annotationMirrors = mirror.metadata.where((e) => e is
-      dart2js_mirrors.Dart2JsConstructedConstantMirror);
+List<Annotation> createAnnotations(DeclarationMirror mirror,
+    Library owningLibrary) {
+  var annotationMirrors = mirror.metadata
+      .where((e) => e is dart2js_mirrors.Dart2JsConstructedConstantMirror);
   var annotations = [];
   annotationMirrors.forEach((annotation) {
     var docgenAnnotation = new Annotation(annotation, owningLibrary);
@@ -73,6 +74,134 @@ String getPackageName(LibraryMirror mirror) {
   return packageNameFor(rootdir);
 }
 
+
+/// Helper that maps [mirrors] to their simple name in map.
+Map addAll(Map map, Iterable<DeclarationMirror> mirrors) {
+  for (var mirror in mirrors) {
+    map[dart2js_util.nameOf(mirror)] = mirror;
+  }
+  return map;
+}
+
+/// For the given library determine what items (if any) are exported.
+///
+/// Returns a Map with three keys: "classes", "methods", and "variables" the
+/// values of which point to a map of exported name identifiers with values
+/// corresponding to the actual DeclarationMirror.
+Map<String, Map<String, DeclarationMirror>> calcExportedItems(
+    LibrarySourceMirror library) {
+  var exports = {};
+  exports['classes'] = {};
+  exports['methods'] = {};
+  exports['variables'] = {};
+
+  // Determine the classes, variables and methods that are exported for a
+  // specific dependency.
+  void _populateExports(LibraryDependencyMirror export, bool showExport) {
+    if (!showExport) {
+      // Add all items, and then remove the hidden ones.
+      // Ex: "export foo hide bar"
+      addAll(exports['classes'],
+          dart2js_util.typesOf(export.targetLibrary.declarations));
+      addAll(exports['methods'],
+          export.targetLibrary.declarations.values.where(
+              (mirror) => mirror is MethodMirror));
+      addAll(exports['variables'],
+          dart2js_util.variablesOf(export.targetLibrary.declarations));
+    }
+    for (CombinatorMirror combinator in export.combinators) {
+      for (String identifier in combinator.identifiers) {
+        var librarySourceMirror =
+            export.targetLibrary as DeclarationSourceMirror;
+        var declaration = librarySourceMirror.lookupInScope(identifier);
+        if (declaration == null) {
+          // Technically this should be a bug, but some of our packages
+          // (such as the polymer package) are curently broken in this
+          // way, so we just produce a warning.
+          print('Warning identifier $identifier not found in library '
+              '${dart2js_util.qualifiedNameOf(export.targetLibrary)}');
+        } else {
+          var subMap = exports['classes'];
+          if (declaration is MethodMirror) {
+            subMap = exports['methods'];
+          } else if (declaration is VariableMirror) {
+            subMap = exports['variables'];
+          }
+          if (showExport) {
+            subMap[identifier] = declaration;
+          } else {
+            subMap.remove(identifier);
+          }
+        }
+      }
+    }
+  }
+
+  Iterable<LibraryDependencyMirror> exportList =
+      library.libraryDependencies.where((lib) => lib.isExport);
+  for (LibraryDependencyMirror export in exportList) {
+    // If there is a show in the export, add only the show items to the
+    // library. Ex: "export foo show bar"
+    // Otherwise, add all items, and then remove the hidden ones.
+    // Ex: "export foo hide bar"
+    _populateExports(export,
+        export.combinators.any((combinator) => combinator.isShow));
+  }
+  return exports;
+}
+
+
+/// Returns a map of [Variable] objects constructed from [mirrorMap].
+/// The optional parameter [containingLibrary] is contains data for variables
+/// defined at the top level of a library (potentially for exporting
+/// purposes).
+Map<String, Variable> createVariables(Iterable<VariableMirror> mirrors,
+    Indexable owner) {
+  var data = {};
+  // TODO(janicejl): When map to map feature is created, replace the below
+  // with a filter. Issue(#9590).
+  mirrors.forEach((dart2js_mirrors.Dart2JsFieldMirror mirror) {
+    if (includePrivateMembers || !isHidden(mirror)) {
+      var mirrorName = dart2js_util.nameOf(mirror);
+      data[mirrorName] = new Variable(mirrorName, mirror, owner);
+    }
+  });
+  return data;
+}
+
+/// Returns a map of [Method] objects constructed from [mirrorMap].
+/// The optional parameter [containingLibrary] is contains data for variables
+/// defined at the top level of a library (potentially for exporting
+/// purposes).
+Map<String, Method> createMethods(Iterable<MethodMirror> mirrors,
+    Indexable owner) {
+  var group = new Map<String, Method>();
+  mirrors.forEach((MethodMirror mirror) {
+    if (includePrivateMembers || !mirror.isPrivate) {
+      group[dart2js_util.nameOf(mirror)] = new Method(mirror, owner);
+    }
+  });
+  return group;
+}
+
+/// Returns a map of [Parameter] objects constructed from [mirrorList].
+Map<String, Parameter> createParameters(List<ParameterMirror> mirrorList,
+    Indexable owner) {
+  var data = {};
+  mirrorList.forEach((ParameterMirror mirror) {
+    data[dart2js_util.nameOf(mirror)] =
+        new Parameter(mirror, owner.owningLibrary);
+  });
+  return data;
+}
+
+/// Returns a map of [Generic] objects constructed from the class mirror.
+Map<String, Generic> createGenerics(TypeMirror mirror) {
+  return new Map.fromIterable(mirror.typeVariables,
+      key: (e) => dart2js_util.nameOf(e),
+      value: (e) => new Generic(e));
+}
+
 /// Annotations that we do not display in the viewer.
 const List<String> _SKIPPED_ANNOTATIONS = const [
   'metadata.DocsEditable', '_js_helper.JSName', '_js_helper.Creates',