Add an analyzer_cli option to disable analysis (for faster summary generation)

pkg/analyzer_cli/lib/src/package_analyzer.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_cli.src.package_analyzer;
 
 import 'dart:core' hide Resource;
 import 'dart:io' as io;
 
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 63 matching lines @@
           io.exitCode = ErrorSeverity.ERROR.ordinal;
           return ErrorSeverity.ERROR;
         }
         Source source = _createSourceInContext(file);
         explicitSources.add(source);
         changeSet.addedSource(source);
       }
     }
     context.applyChanges(changeSet);
 
-    // Perform full analysis.
-    while (true) {
-      AnalysisResult analysisResult = context.performAnalysisTask();
-      if (!analysisResult.hasMoreWork) {
-        break;
+    if (!options.packageSummaryOnly) {
+      // Perform full analysis.
+      while (true) {
+        AnalysisResult analysisResult = context.performAnalysisTask();
+        if (!analysisResult.hasMoreWork) {
+          break;
+        }
       }
     }
 
     // Write summary for Dart libraries.
     if (options.packageSummaryOutput != null) {
       PackageBundleAssembler assembler = new PackageBundleAssembler();
       for (Source source in context.librarySources) {
         if (pathos.isWithin(packageLibPath, source.fullName)) {
-          LibraryElement libraryElement = context.getLibraryElement(source);
+          LibraryElement libraryElement = context.computeLibraryElement(source);
           if (libraryElement != null) {
             assembler.serializeLibraryElement(libraryElement);
           }
         }
       }
       // Write the whole package bundle.
       PackageBundleBuilder sdkBundle = assembler.assemble();
       io.File file = new io.File(options.packageSummaryOutput);
       file.writeAsBytesSync(sdkBundle.toBuffer(), mode: io.FileMode.WRITE_ONLY);
     }
 
-    // Process errors.
-    _printErrors();
-    return _computeMaxSeverity();
+    if (options.packageSummaryOnly) {
+      return ErrorSeverity.NONE;
+    } else {
+      // Process errors.
+      _printErrors();
+      return _computeMaxSeverity();
+    }
   }
 
   ErrorSeverity _computeMaxSeverity() {
     ErrorSeverity maxSeverity = ErrorSeverity.NONE;
     for (Source source in explicitSources) {
       AnalysisErrorInfo errorInfo = context.getErrors(source);
       for (AnalysisError error in errorInfo.errors) {
         ProcessedSeverity processedSeverity =
             AnalyzerImpl.processError(error, options, context);
         if (processedSeverity != null) {
@@ skipping 53 matching lines @@
         sink,
         options,
         (AnalysisError error) =>
             AnalyzerImpl.processError(error, options, context));
     for (Source source in explicitSources) {
       AnalysisErrorInfo errorInfo = context.getErrors(source);
       formatter.formatErrors([errorInfo]);
     }
   }
 }