Add support for analyzing individual URIs.

tests/compiler/dart2js/memory_compiler.dart

 // Copyright (c) 2013, 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 dart2js.test.memory_compiler;
 
 import 'dart:async';
 
 import 'package:compiler/compiler.dart' show
     DiagnosticHandler;
@@ skipping 82 matching lines @@
               String text, Diagnostic kind) {
     for (CompilerDiagnostics diagnostics in diagnosticsList) {
       diagnostics.report(message, uri, begin, end, text, kind);
     }
   }
 }
 
 CompilerDiagnostics createCompilerDiagnostics(
     CompilerDiagnostics diagnostics,
     SourceFileProvider provider,
-    bool showDiagnostics) {
+    {bool showDiagnostics: true,
+     bool verbose: false}) {
   CompilerDiagnostics handler = diagnostics;
   if (showDiagnostics) {
     if (diagnostics == null) {
-      handler = new FormattingDiagnosticHandler(provider);
+      handler = new FormattingDiagnosticHandler(provider)..verbose = verbose;
     } else {
-      var formattingHandler = new FormattingDiagnosticHandler(provider);
+      var formattingHandler =
+          new FormattingDiagnosticHandler(provider)..verbose = verbose;
       handler = new MultiDiagnostics([diagnostics, formattingHandler]);
     }
   } else if (diagnostics == null) {
     handler = new MultiDiagnostics();
   }
   return handler;
 }
 
 Expando<MemorySourceFileProvider> expando =
     new Expando<MemorySourceFileProvider>();
 
 Future<CompilationResult> runCompiler(
     {Map<String, String> memorySourceFiles: const <String, String>{},
      Uri entryPoint,
      List<Uri> entryPoints,
      CompilerDiagnostics diagnosticHandler,
      CompilerOutput outputProvider,
      List<String> options: const <String>[],
      Compiler cachedCompiler,
      bool showDiagnostics: true,
      Uri packageRoot,
      Uri packageConfig,
      PackagesDiscoveryProvider packagesDiscoveryProvider,
      void beforeRun(Compiler compiler)}) async {
   if (entryPoint == null) {
     entryPoint = Uri.parse('memory:main.dart');
   }
   Compiler compiler = compilerFor(
-      memorySourceFiles,
+      memorySourceFiles: memorySourceFiles,
       diagnosticHandler: diagnosticHandler,
       outputProvider: outputProvider,
       options: options,
       cachedCompiler: cachedCompiler,
       showDiagnostics: showDiagnostics,
       packageRoot: packageRoot,
       packageConfig: packageConfig,
       packagesDiscoveryProvider: packagesDiscoveryProvider);
   compiler.librariesToAnalyzeWhenRun = entryPoints;
   if (beforeRun != null) {
     beforeRun(compiler);
   }
   bool isSuccess = await compiler.run(entryPoint);
   return new CompilationResult(compiler, isSuccess: isSuccess);
 }
 
 Compiler compilerFor(
-    Map<String, String> memorySourceFiles,
-    {CompilerDiagnostics diagnosticHandler,
+    {Map<String, String> memorySourceFiles: const <String, String>{},
+     CompilerDiagnostics diagnosticHandler,
      CompilerOutput outputProvider,
      List<String> options: const <String>[],
      Compiler cachedCompiler,
      bool showDiagnostics: true,
      Uri packageRoot,
      Uri packageConfig,
      PackagesDiscoveryProvider packagesDiscoveryProvider}) {
   Uri libraryRoot = Uri.base.resolve('sdk/');
   if (packageRoot == null &&
       packageConfig == null &&
       packagesDiscoveryProvider == null) {
     packageRoot = Uri.base.resolveUri(new Uri.file('${Platform.packageRoot}/'));
   }
 
   MemorySourceFileProvider provider;
   if (cachedCompiler == null) {
     provider = new MemorySourceFileProvider(memorySourceFiles);
     // Saving the provider in case we need it later for a cached compiler.
     expando[provider] = provider;
   } else {
     // When using a cached compiler, it has read a number of files from disk
     // already (and will not attempt to read them again due to caching). These
     // files must be available to the new diagnostic handler.
     provider = expando[cachedCompiler.provider];
     provider.memorySourceFiles = memorySourceFiles;
   }
-  diagnosticHandler =
-      createCompilerDiagnostics(diagnosticHandler, provider, showDiagnostics);
+  diagnosticHandler = createCompilerDiagnostics(
+      diagnosticHandler, provider,
+      showDiagnostics: showDiagnostics,
+      verbose: options.contains('-v') || options.contains('--verbose'));
 
   if (outputProvider == null) {
     outputProvider = const NullCompilerOutput();
   }
 
   Compiler compiler = new Compiler(
       provider,
       outputProvider,
       diagnosticHandler,
       libraryRoot,
@@ skipping 127 matching lines @@
       createDiagnosticHandler(diagnosticHandler, provider, showDiagnostics);
 
   List<Uri> libraries = <Uri>[];
   memorySourceFiles.forEach((String path, _) {
     libraries.add(new Uri(scheme: 'memory', path: path));
   });
 
   return analyze(libraries, libraryRoot, packageRoot,
                  provider, handler, options);
 }