Use shorter DartElementLocation.

pkg/analyzer/lib/src/generated/engine.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine;
 
 import "dart:math" as math;
@@ skipping 1695 matching lines @@
   @override
   InternalAnalysisContext getContextFor(Source source) {
     InternalAnalysisContext context = _cache.getContextFor(source);
     return context == null ? this : context;
   }
 
   @override
   Element getElement(ElementLocation location) {
     // TODO(brianwilkerson) This should not be a "get" method.
     try {
-      List<String> components = location.components;
-      Source source = _computeSourceFromEncoding(components[0]);
-      String sourceName = source.shortName;
-      if (AnalysisEngine.isDartFileName(sourceName)) {
-        ElementImpl element = computeLibraryElement(source) as ElementImpl;
-        for (int i = 1; i < components.length; i++) {
-          if (element == null) {
-            return null;
-          }
-          element = element.getChild(components[i]);
-        }
-        return element;
+      if (location is DartElementLocation) {
+        String libSourceEncoding = location.librarySourceEncoding;
+        Source libSource = _computeSourceFromEncoding(libSourceEncoding);
+        LibraryElementImpl libElement = computeLibraryElement(libSource);
+        return libElement.getChildElement(
+            location.unitSourceEncoding,
+            location.nameOffset,
+            location.kind);
       }
-      if (AnalysisEngine.isHtmlFileName(sourceName)) {
-        return computeHtmlElement(source);
-      }
+      // TODO(scheglov) add HtmlElementLocation
     } on AnalysisException catch (exception) {
     }
     return null;
   }
 
   @override
   AnalysisErrorInfo getErrors(Source source) {
     SourceEntry sourceEntry = _getReadableSourceEntryOrNull(source);
     if (sourceEntry is DartEntry) {
       DartEntry dartEntry = sourceEntry;
@@ skipping 12946 matching lines @@
 
   @override
   Object visitPolymerTagDartElement(PolymerTagDartElement element) {
     if (element.name == PolymerHtmlUnitBuilder_this._elementName) {
       throw new PolymerHtmlUnitBuilder_FoundTagDartElementError(
           element as PolymerTagDartElementImpl);
     }
     return null;
   }
 }