Get LibraryElement(s) and CompilationUnitElement(s) from summary.

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/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 859 matching lines @@
 
   @override
   void internalPerform() {
     //
     // Prepare inputs.
     //
     LibrarySpecificUnit librarySpecificUnit = target;
     Source source = getRequiredSource();
     CompilationUnit unit = getRequiredInput(PARSED_UNIT_INPUT_NAME);
     //
+    // Try to get the existing CompilationUnitElement.
+    //
+    CompilationUnitElement element;
+    {
+      InternalAnalysisContext internalContext =
+          context as InternalAnalysisContext;
+      AnalysisCache analysisCache = internalContext.analysisCache;
+      CacheEntry cacheEntry = internalContext.getCacheEntry(target);
+      element = analysisCache.getValue(target, COMPILATION_UNIT_ELEMENT);
+      if (element == null &&
+          internalContext.aboutToComputeResult(
+              cacheEntry, COMPILATION_UNIT_ELEMENT)) {
+        element = analysisCache.getValue(target, COMPILATION_UNIT_ELEMENT);
+      }
+    }
+    //
     // Build or reuse CompilationUnitElement.
     //
-//    unit = AstCloner.clone(unit);
-    AnalysisCache analysisCache =
-        (context as InternalAnalysisContext).analysisCache;
-    CompilationUnitElement element =
-        analysisCache.getValue(target, COMPILATION_UNIT_ELEMENT);
     if (element == null) {
       CompilationUnitBuilder builder = new CompilationUnitBuilder();
       element = builder.buildCompilationUnit(
           source, unit, librarySpecificUnit.library);
     } else {
       new DeclarationResolver().resolve(unit, element);
     }
     //
     // Prepare constants.
     //
@@ skipping 452 matching lines @@
       errors.add(error);
     }
     //
     // Create and populate the library element.
     //
     AnalysisContext owningContext = context;
     if (context is InternalAnalysisContext) {
       InternalAnalysisContext internalContext = context;
       owningContext = internalContext.getContextFor(librarySource);
     }
-    LibraryElementImpl libraryElement =
-        new LibraryElementImpl.forNode(owningContext, libraryNameNode);
-    libraryElement.definingCompilationUnit = definingCompilationUnitElement;
-    libraryElement.entryPoint = entryPoint;
-    libraryElement.parts = sourcedCompilationUnits;
-    for (Directive directive in directivesToResolve) {
-      directive.element = libraryElement;
+    //
+    // Try to get the existing LibraryElement.
+    //
+    LibraryElementImpl libraryElement;
+    {
+      InternalAnalysisContext internalContext =
+          context as InternalAnalysisContext;
+      AnalysisCache analysisCache = internalContext.analysisCache;
+      CacheEntry cacheEntry = internalContext.getCacheEntry(target);
+      libraryElement = analysisCache.getValue(target, LIBRARY_ELEMENT1);
+      if (libraryElement == null &&
+          internalContext.aboutToComputeResult(cacheEntry, LIBRARY_ELEMENT1)) {
+        libraryElement = analysisCache.getValue(target, LIBRARY_ELEMENT1);
+      }
     }
-    BuildLibraryElementUtils.patchTopLevelAccessors(libraryElement);
-    // set the library documentation to the docs associated with the first
-    // directive in the compilation unit.
-    if (definingCompilationUnit.directives.isNotEmpty) {
-      setElementDocumentationComment(
-          libraryElement, definingCompilationUnit.directives.first);
+    //
+    // Create a new LibraryElement.
+    //
+    if (libraryElement == null) {
+      libraryElement =
+          new LibraryElementImpl.forNode(owningContext, libraryNameNode);
+      libraryElement.definingCompilationUnit = definingCompilationUnitElement;
+      libraryElement.entryPoint = entryPoint;
+      libraryElement.parts = sourcedCompilationUnits;
+      for (Directive directive in directivesToResolve) {
+        directive.element = libraryElement;
+      }
+      BuildLibraryElementUtils.patchTopLevelAccessors(libraryElement);
+      // set the library documentation to the docs associated with the first
+      // directive in the compilation unit.
+      if (definingCompilationUnit.directives.isNotEmpty) {
+        setElementDocumentationComment(
+            libraryElement, definingCompilationUnit.directives.first);
+      }
     }
-
     //
     // Record outputs.
     //
     outputs[BUILD_LIBRARY_ERRORS] = errors;
     outputs[LIBRARY_ELEMENT1] = libraryElement;
     outputs[IS_LAUNCHABLE] = entryPoint != null;
   }
 
   /**
    * Return the top-level [FunctionElement] entry point, or `null` if the given
@@ skipping 3864 matching lines @@
 
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.removeLast();
     return true;
   }
 }