Move PublicNamespaceBuilder into tasks.

pkg/analyzer/lib/src/task/dart.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 analyzer.src.task.dart;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 871 matching lines @@
   BuildPublicNamespaceTask(
       InternalAnalysisContext context, AnalysisTarget target)
       : super(context, target);
 
   @override
   TaskDescriptor get descriptor => DESCRIPTOR;
 
   @override
   void internalPerform() {
     LibraryElement library = getRequiredInput(BUILT_LIBRARY_ELEMENT_INPUT_NAME);
-
-    NamespaceBuilder builder = new NamespaceBuilder();
-    Namespace namespace = builder.createPublicNamespaceForLibrary(library);
-
+    Namespace namespace = new PublicNamespaceBuilder().build(library);
     outputs[PUBLIC_NAMESPACE] = namespace;
   }
 
   /**
    * Return a map from the names of the inputs of this kind of task to the task
    * input descriptors describing those inputs for a task with the
    * given library [source].
    */
   static Map<String, TaskInput> buildInputs(Source source) {
     return <String, TaskInput>{
@@ skipping 256 matching lines @@
       errorListener.onError(new AnalysisError.con2(librarySource,
           uriLiteral.offset, uriLiteral.length,
           CompileTimeErrorCode.INVALID_URI, [uriContent]));
       return null;
     }
     throw new AnalysisException('Failed to handle validation code: $code');
   }
 }
 
 /**
+ * The helper for building the public [Namespace] of a [LibraryElement].
+ */
+class PublicNamespaceBuilder {
+  final HashMap<String, Element> definedNames = new HashMap<String, Element>();
+
+  /**
+   * Build a public [Namespace] of the given [library].
+   */
+  Namespace build(LibraryElement library) {
+    definedNames.clear();
+    _addPublicNames(library.definingCompilationUnit);
+    library.parts.forEach(_addPublicNames);
+    return new Namespace(definedNames);
+  }
+
+  /**
+   * Add the given [element] if it has a publicly visible name.
+   */
+  void _addIfPublic(Element element) {
+    String name = element.name;
+    if (name != null && !Scope.isPrivateName(name)) {
+      definedNames[name] = element;
+    }
+  }
+
+  /**
+   * Add all of the public top-level names that are defined in the given
+   * [compilationUnit].
+   */
+  void _addPublicNames(CompilationUnitElement compilationUnit) {
+    compilationUnit.accessors.forEach(_addIfPublic);
+    compilationUnit.enums.forEach(_addIfPublic);
+    compilationUnit.functions.forEach(_addIfPublic);
+    compilationUnit.functionTypeAliases.forEach(_addIfPublic);
+    compilationUnit.types.forEach(_addIfPublic);
+  }
+}
+
+/**
  * A task that scans the content of a file, producing a set of Dart tokens.
  */
 class ScanDartTask extends SourceBasedAnalysisTask {
   /**
    * The name of the input whose value is the content of the file.
    */
   static const String CONTENT_INPUT_NAME = 'CONTENT_INPUT_NAME';
 
   /**
    * The task descriptor describing this kind of task.
@@ skipping 39 matching lines @@
   }
 
   /**
    * Create a [ScanDartTask] based on the given [target] in the given [context].
    */
   static ScanDartTask createTask(
       AnalysisContext context, AnalysisTarget target) {
     return new ScanDartTask(context, target);
   }
 }