Check compiler exitCode.

sdk/lib/_internal/compiler/implementation/dart2js.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.cmdline;
 
 import 'dart:async';
 import 'dart:io'
     show exit, File, FileMode, Platform, RandomAccessFile;
 import 'dart:math' as math;
@@ skipping 27 matching lines @@
 typedef void HandleOption(data);
 
 class OptionHandler {
   final String pattern;
   final HandleOption handle;
   final bool multipleArguments;
 
   OptionHandler(this.pattern, this.handle, {this.multipleArguments: false});
 }
 
-/**
- * Extract the parameter of an option.
- *
- * For example, in ['--out=fisk.js'] and ['-ohest.js'], the parameters
- * are ['fisk.js'] and ['hest.js'], respectively.
- */
-String extractParameter(String argument) {
-  // m[0] is the entire match (which will be equal to argument). m[1]
-  // is something like "-o" or "--out=", and m[2] is the parameter.
-  Match m = new RegExp('^(-[a-z]|--.+=)(.*)').firstMatch(argument);
-  if (m == null) helpAndFail('Error: Unknown option "$argument".');
-  return m[2];
+class _Dart2Js {

[ahe, 2013/11/21 12:44:53]

If you think it makes sense to create a class here, we can discuss that, but I'm
not sure I see why it is necessary. If convince me that it is, I think it should
be done as a separate CL.

+  final exitFunc;
+  final compileFunc;
+
+  _Dart2Js(this.exitFunc, this.compileFunc);
+
+  /**
+   * Extract the parameter of an option.
+   *
+   * For example, in ['--out=fisk.js'] and ['-ohest.js'], the parameters
+   * are ['fisk.js'] and ['hest.js'], respectively.
+   */
+  String extractParameter(String argument) {
+    // m[0] is the entire match (which will be equal to argument). m[1]
+    // is something like "-o" or "--out=", and m[2] is the parameter.
+    Match m = new RegExp('^(-[a-z]|--.+=)(.*)').firstMatch(argument);
+    if (m == null) helpAndFail('Error: Unknown option "$argument".');
+    return m[2];
+  }
+
+  String extractPath(String argument) {
+    String path = nativeToUriPath(extractParameter(argument));
+    return path.endsWith("/") ? path : "$path/";
+  }
+
+  void parseCommandLine(List<OptionHandler> handlers, List<String> argv) {
+    // TODO(ahe): Use ../../args/args.dart for parsing options instead.
+    var patterns = <String>[];
+    for (OptionHandler handler in handlers) {
+      patterns.add(handler.pattern);
+    }
+    var pattern = new RegExp('^(${patterns.join(")\$|(")})\$');
+
+    Iterator<String> arguments = argv.iterator;
+    OUTER: while (arguments.moveNext()) {
+      String argument = arguments.current;
+      Match match = pattern.firstMatch(argument);
+      assert(match.groupCount == handlers.length);
+      for (int i = 0; i < handlers.length; i++) {
+        if (match[i + 1] != null) {
+          OptionHandler handler = handlers[i];
+          if (handler.multipleArguments) {
+            handler.handle(arguments);
+          } else {
+            handler.handle(argument);
+          }
+          continue OUTER;
+        }
+      }
+      throw 'Internal error: "$argument" did not match';
+    }
+  }
+
+  FormattingDiagnosticHandler diagnosticHandler;
+
+  Future compile(List<String> argv) {
+    bool isWindows = (Platform.operatingSystem == 'windows');
+    stackTraceFilePrefix = '$currentDirectory';
+    Uri libraryRoot = currentDirectory;
+    Uri out = currentDirectory.resolve('out.js');
+    Uri sourceMapOut = currentDirectory.resolve('out.js.map');
+    Uri packageRoot = null;
+    List<String> options = new List<String>();
+    bool explicitOut = false;
+    bool wantHelp = false;
+    bool wantVersion = false;
+    String outputLanguage = 'JavaScript';
+    bool stripArgumentSet = false;
+    bool analyzeOnly = false;
+    bool hasDisallowUnsafeEval = false;
+    // TODO(johnniwinther): Measure time for reading files.
+    SourceFileProvider inputProvider = new CompilerSourceFileProvider();
+    diagnosticHandler = new FormattingDiagnosticHandler(inputProvider);
+    Map<String, dynamic> environment = new Map<String, dynamic>();
+
+    passThrough(String argument) => options.add(argument);
+
+    if (BUILD_ID != null) {
+      passThrough("--build-id=$BUILD_ID");
+    }
+
+    setLibraryRoot(String argument) {
+      libraryRoot = currentDirectory.resolve(extractPath(argument));
+    }
+
+    setPackageRoot(String argument) {
+      packageRoot = currentDirectory.resolve(extractPath(argument));
+    }
+
+    setOutput(Iterator<String> arguments) {
+      String path;
+      if (arguments.current == '-o') {
+        if (!arguments.moveNext()) {
+          helpAndFail('Error: Missing file after -o option.');
+        }
+        path = arguments.current;
+      } else {
+        path = extractParameter(arguments.current);
+      }
+      explicitOut = true;
+      out = currentDirectory.resolve(nativeToUriPath(path));
+      sourceMapOut = Uri.parse('$out.map');
+    }
+
+    setOutputType(String argument) {
+      if (argument == '--output-type=dart') {
+        outputLanguage = OUTPUT_LANGUAGE_DART;
+        if (!explicitOut) {
+          out = currentDirectory.resolve('out.dart');
+          sourceMapOut = currentDirectory.resolve('out.dart.map');
+        }
+      }
+      passThrough(argument);
+    }
+
+    String getDepsOutput(Map<String, SourceFile> sourceFiles) {
+      var filenames = new List.from(sourceFiles.keys);
+      filenames.sort();
+      return filenames.join("\n");
+    }
+
+    setStrip(String argument) {
+      stripArgumentSet = true;
+      passThrough(argument);
+    }
+
+    setAnalyzeOnly(String argument) {
+      analyzeOnly = true;
+      passThrough(argument);
+    }
+
+    setVerbose(_) {
+      diagnosticHandler.verbose = true;
+      passThrough('--verbose');
+    }
+
+    addInEnvironment(String argument) {
+      int eqIndex = argument.indexOf('=');
+      String name = argument.substring(2, eqIndex);
+      String value = argument.substring(eqIndex + 1);
+      environment[name] = value;
+    }
+
+    setCategories(String argument) {
+      List<String> categories = extractParameter(argument).split(',');
+      Set<String> allowedCategories =
+          LIBRARIES.values.map((x) => x.category).toSet();
+      allowedCategories.remove('Shared');
+      allowedCategories.remove('Internal');
+      List<String> allowedCategoriesList =
+          new List<String>.from(allowedCategories);
+      allowedCategoriesList.sort();
+      if (categories.contains('all')) {
+        categories = allowedCategoriesList;
+      } else {
+        String allowedCategoriesString = allowedCategoriesList.join(', ');
+        for (String category in categories) {
+          if (!allowedCategories.contains(category)) {
+            fail('Error: unsupported library category "$category", '
+                 'supported categories are: $allowedCategoriesString');
+          }
+        }
+      }
+      passThrough('--categories=${categories.join(",")}');
+    }
+
+    checkGlobalName(String argument) {
+      String globalName = extractParameter(argument);
+      if (!new RegExp(r'^\$[a-z]*$').hasMatch(globalName)) {
+        fail('Error: "$globalName" must match "\\\$[a-z]*"');
+      }
+      passThrough(argument);
+    }
+
+    handleShortOptions(String argument) {
+      var shortOptions = argument.substring(1).split("");
+      for (var shortOption in shortOptions) {
+        switch (shortOption) {
+          case 'v':
+            setVerbose(null);
+            break;
+          case 'h':
+          case '?':
+            wantHelp = true;
+            break;
+          case 'c':
+            passThrough('--enable-checked-mode');
+            break;
+          default:
+            throw 'Internal error: "$shortOption" did not match';
+        }
+      }
+    }
+
+    Uri computePrecompiledUri() {
+      String extension = 'precompiled.js';
+      String outPath = out.path;
+      if (outPath.endsWith('.js')) {
+        outPath = outPath.substring(0, outPath.length - 3);
+        return out.resolve('$outPath.$extension');
+      } else {
+        return out.resolve(extension);
+      }
+    }
+
+    List<String> arguments = <String>[];
+    List<OptionHandler> handlers = <OptionHandler>[
+      new OptionHandler('-[chv?]+', handleShortOptions),
+      new OptionHandler('--throw-on-error',
+                        (_) => diagnosticHandler.throwOnError = true),
+      new OptionHandler('--suppress-warnings',
+                        (_) => diagnosticHandler.showWarnings = false),
+      new OptionHandler('--suppress-hints',
+                        (_) => diagnosticHandler.showHints = false),
+      new OptionHandler('--output-type=dart|--output-type=js', setOutputType),
+      new OptionHandler('--verbose', setVerbose),
+      new OptionHandler('--version', (_) => wantVersion = true),
+      new OptionHandler('--library-root=.+', setLibraryRoot),
+      new OptionHandler('--out=.+|-o.*', setOutput, multipleArguments: true),
+      new OptionHandler('--allow-mock-compilation', passThrough),
+      new OptionHandler('--minify', passThrough),
+      new OptionHandler('--force-strip=.*', setStrip),
+      new OptionHandler('--disable-diagnostic-colors',
+                        (_) => diagnosticHandler.enableColors = false),
+      new OptionHandler('--enable-diagnostic-colors',
+                        (_) => diagnosticHandler.enableColors = true),
+      new OptionHandler('--enable[_-]checked[_-]mode|--checked',
+                        (_) => passThrough('--enable-checked-mode')),
+      new OptionHandler('--enable-concrete-type-inference',
+                        (_) => passThrough('--enable-concrete-type-inference')),
+      new OptionHandler('--trust-type-annotations',
+                        (_) => passThrough('--trust-type-annotations')),
+      new OptionHandler(r'--help|/\?|/h', (_) => wantHelp = true),
+      new OptionHandler('--package-root=.+|-p.+', setPackageRoot),
+      new OptionHandler('--analyze-all', passThrough),
+      new OptionHandler('--analyze-only', setAnalyzeOnly),
+      new OptionHandler('--analyze-signatures-only', passThrough),
+      new OptionHandler('--disable-native-live-type-analysis', passThrough),
+      new OptionHandler('--categories=.*', setCategories),
+      new OptionHandler('--global-js-name=.*', checkGlobalName),
+      new OptionHandler('--disable-type-inference', passThrough),
+      new OptionHandler('--terse', passThrough),
+      new OptionHandler('--disallow-unsafe-eval',
+                        (_) => hasDisallowUnsafeEval = true),
+      new OptionHandler('-D.+=.*', addInEnvironment),
+
+      // The following two options must come last.
+      new OptionHandler('-.*', (String argument) {
+        helpAndFail('Error: Unknown option "$argument".');
+      }),
+      new OptionHandler('.*', (String argument) {
+        arguments.add(nativeToUriPath(argument));
+      })
+    ];
+
+    parseCommandLine(handlers, argv);
+    if (wantHelp || wantVersion) {
+      helpAndExit(wantHelp, wantVersion, diagnosticHandler.verbose);
+    }
+
+    if (hasDisallowUnsafeEval) {
+      String precompiledName =
+          relativize(currentDirectory, computePrecompiledUri(), isWindows);
+      helpAndFail("Error: option '--disallow-unsafe-eval' has been removed."
+                  " Instead, the compiler generates a file named"
+                  " '$precompiledName'.");
+    }
+
+    if (outputLanguage != OUTPUT_LANGUAGE_DART && stripArgumentSet) {
+      helpAndFail('Error: --force-strip may only be used with '
+          '--output-type=dart');
+    }
+    if (arguments.isEmpty) {
+      helpAndFail('Error: No Dart file specified.');
+    }
+    if (arguments.length > 1) {
+      var extra = arguments.sublist(1);
+      helpAndFail('Error: Extra arguments: ${extra.join(" ")}');
+    }
+
+    Uri uri = currentDirectory.resolve(arguments[0]);
+    if (packageRoot == null) {
+      packageRoot = uri.resolve('./packages/');
+    }
+
+    diagnosticHandler.info('package root is $packageRoot');
+
+    int totalCharactersWritten = 0;
+
+    options.add('--source-map=$sourceMapOut');
+
+    compilationDone(String code) {
+      if (analyzeOnly) return;
+      if (code == null) {
+        fail('Error: Compilation failed.');
+      }
+      writeString(Uri.parse('$out.deps'),
+                  getDepsOutput(inputProvider.sourceFiles));
+      diagnosticHandler.info(
+           'compiled ${inputProvider.dartCharactersRead} characters Dart '
+           '-> $totalCharactersWritten characters $outputLanguage '
+           'in ${relativize(currentDirectory, out, isWindows)}');
+      if (!explicitOut) {
+        String input = uriPathToNative(arguments[0]);
+        String output = relativize(currentDirectory, out, isWindows);
+        print('Dart file ($input) compiled to $outputLanguage: $output');
+      }
+    }
+
+    EventSink<String> outputProvider(String name, String extension) {
+      Uri uri;
+      String sourceMapFileName;
+      bool isPrimaryOutput = false;
+      if (name == '') {
+        if (extension == 'js' || extension == 'dart') {
+          isPrimaryOutput = true;
+          uri = out;
+          sourceMapFileName =
+              sourceMapOut.path.substring(sourceMapOut.path.lastIndexOf('/') + 1);
+        } else if (extension == 'precompiled.js') {
+          uri = computePrecompiledUri();
+          diagnosticHandler.info(
+              "File ($uri) is compatible with header"
+              " \"Content-Security-Policy: script-src 'self'\"");
+        } else if (extension == 'js.map' || extension == 'dart.map') {
+          uri = sourceMapOut;
+        } else {
+          fail('Error: Unknown extension: $extension');
+        }
+      } else {
+        uri = out.resolve('$name.$extension');
+      }
+
+      if (uri.scheme != 'file') {
+        fail('Error: Unhandled scheme ${uri.scheme} in $uri.');
+      }
+
+      RandomAccessFile output =
+          new File(uriPathToNative(uri.path)).openSync(mode: FileMode.WRITE);
+      int charactersWritten = 0;
+
+      writeStringSync(String data) {
+        // Write the data in chunks of 8kb, otherwise we risk running OOM
+        int chunkSize = 8*1024;
+
+        int offset = 0;
+        while (offset < data.length) {
+          output.writeStringSync(
+              data.substring(offset, math.min(offset + chunkSize, data.length)));
+          offset += chunkSize;
+        }
+        charactersWritten += data.length;
+      }
+
+      onDone() {
+        if (sourceMapFileName != null) {
+          // Using # is the new proposed standard. @ caused problems in Internet
+          // Explorer due to "Conditional Compilation Statements" in JScript,
+          // see:
+          // http://msdn.microsoft.com/en-us/library/7kx09ct1(v=vs.80).aspx
+          // About source maps, see:
+          // https://docs.google.com/a/google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit
+          // TODO(http://dartbug.com/11914): Remove @ line.
+          String sourceMapTag = '''
+  
+  //# sourceMappingURL=$sourceMapFileName
+  //@ sourceMappingURL=$sourceMapFileName
+  ''';
+          writeStringSync(sourceMapTag);
+        }
+        output.closeSync();
+        if (isPrimaryOutput) {
+          totalCharactersWritten += charactersWritten;
+        }
+      }
+
+      return new EventSinkWrapper(writeStringSync, onDone);
+    }
+
+    return compileFunc(uri, libraryRoot, packageRoot,
+                       inputProvider, diagnosticHandler,
+                       options, outputProvider, environment)
+              .then(compilationDone);
+  }
+
+  void writeString(Uri uri, String text) {
+    if (uri.scheme != 'file') {
+      fail('Error: Unhandled scheme ${uri.scheme}.');
+    }
+    var file = new File(uriPathToNative(uri.path)).openSync(mode: FileMode.WRITE);
+    file.writeStringSync(text);
+    file.closeSync();
+  }
+
+  void fail(String message) {
+    if (diagnosticHandler != null) {
+      diagnosticHandler.diagnosticHandler(
+          null, -1, -1, message, api.Diagnostic.ERROR);
+    } else {
+      print(message);
+    }
+    exitFunc(1);
+  }
+
+  Future compilerMain(List<String> arguments) {
+    var root = uriPathToNative("/$LIBRARY_ROOT");
+    arguments = <String>['--library-root=${Platform.script.toFilePath()}$root']
+        ..addAll(arguments);
+    return compile(arguments);
+  }
+
+  void helpAndExit(bool wantHelp, bool wantVersion, bool verbose) {
+    if (wantVersion) {
+      var version = (BUILD_ID == null)
+          ? '<non-SDK build>'
+          : BUILD_ID;
+      print('Dart-to-JavaScript compiler (dart2js) version: $version');
+    }
+    if (wantHelp) {
+      if (verbose) {
+        verboseHelp();
+      } else {
+        help();
+      }
+    }
+    exitFunc(0);
+  }
+
+  void helpAndFail(String message) {
+    help();
+    print('');
+    fail(message);
+  }
 }
 
-String extractPath(String argument) {
-  String path = nativeToUriPath(extractParameter(argument));
-  return path.endsWith("/") ? path : "$path/";
-}
-
-void parseCommandLine(List<OptionHandler> handlers, List<String> argv) {
-  // TODO(ahe): Use ../../args/args.dart for parsing options instead.
-  var patterns = <String>[];
-  for (OptionHandler handler in handlers) {
-    patterns.add(handler.pattern);
-  }
-  var pattern = new RegExp('^(${patterns.join(")\$|(")})\$');
-
-  Iterator<String> arguments = argv.iterator;
-  OUTER: while (arguments.moveNext()) {
-    String argument = arguments.current;
-    Match match = pattern.firstMatch(argument);
-    assert(match.groupCount == handlers.length);
-    for (int i = 0; i < handlers.length; i++) {
-      if (match[i + 1] != null) {
-        OptionHandler handler = handlers[i];
-        if (handler.multipleArguments) {
-          handler.handle(arguments);
-        } else {
-          handler.handle(argument);
-        }
-        continue OUTER;
-      }
-    }
-    throw 'Internal error: "$argument" did not match';
-  }
-}
-
-FormattingDiagnosticHandler diagnosticHandler;
-
-Future compile(List<String> argv) {
-  bool isWindows = (Platform.operatingSystem == 'windows');
-  stackTraceFilePrefix = '$currentDirectory';
-  Uri libraryRoot = currentDirectory;
-  Uri out = currentDirectory.resolve('out.js');
-  Uri sourceMapOut = currentDirectory.resolve('out.js.map');
-  Uri packageRoot = null;
-  List<String> options = new List<String>();
-  bool explicitOut = false;
-  bool wantHelp = false;
-  bool wantVersion = false;
-  String outputLanguage = 'JavaScript';
-  bool stripArgumentSet = false;
-  bool analyzeOnly = false;
-  bool hasDisallowUnsafeEval = false;
-  // TODO(johnniwinther): Measure time for reading files.
-  SourceFileProvider inputProvider = new CompilerSourceFileProvider();
-  diagnosticHandler = new FormattingDiagnosticHandler(inputProvider);
-  Map<String, dynamic> environment = new Map<String, dynamic>();
-
-  passThrough(String argument) => options.add(argument);
-
-  if (BUILD_ID != null) {
-    passThrough("--build-id=$BUILD_ID");
-  }
-
-  setLibraryRoot(String argument) {
-    libraryRoot = currentDirectory.resolve(extractPath(argument));
-  }
-
-  setPackageRoot(String argument) {
-    packageRoot = currentDirectory.resolve(extractPath(argument));
-  }
-
-  setOutput(Iterator<String> arguments) {
-    String path;
-    if (arguments.current == '-o') {
-      if (!arguments.moveNext()) {
-        helpAndFail('Error: Missing file after -o option.');
-      }
-      path = arguments.current;
-    } else {
-      path = extractParameter(arguments.current);
-    }
-    explicitOut = true;
-    out = currentDirectory.resolve(nativeToUriPath(path));
-    sourceMapOut = Uri.parse('$out.map');
-  }
-
-  setOutputType(String argument) {
-    if (argument == '--output-type=dart') {
-      outputLanguage = OUTPUT_LANGUAGE_DART;
-      if (!explicitOut) {
-        out = currentDirectory.resolve('out.dart');
-        sourceMapOut = currentDirectory.resolve('out.dart.map');
-      }
-    }
-    passThrough(argument);
-  }
-
-  String getDepsOutput(Map<String, SourceFile> sourceFiles) {
-    var filenames = new List.from(sourceFiles.keys);
-    filenames.sort();
-    return filenames.join("\n");
-  }
-
-  setStrip(String argument) {
-    stripArgumentSet = true;
-    passThrough(argument);
-  }
-
-  setAnalyzeOnly(String argument) {
-    analyzeOnly = true;
-    passThrough(argument);
-  }
-
-  setVerbose(_) {
-    diagnosticHandler.verbose = true;
-    passThrough('--verbose');
-  }
-
-  addInEnvironment(String argument) {
-    int eqIndex = argument.indexOf('=');
-    String name = argument.substring(2, eqIndex);
-    String value = argument.substring(eqIndex + 1);
-    environment[name] = value;
-  }
-
-  setCategories(String argument) {
-    List<String> categories = extractParameter(argument).split(',');
-    Set<String> allowedCategories =
-        LIBRARIES.values.map((x) => x.category).toSet();
-    allowedCategories.remove('Shared');
-    allowedCategories.remove('Internal');
-    List<String> allowedCategoriesList =
-        new List<String>.from(allowedCategories);
-    allowedCategoriesList.sort();
-    if (categories.contains('all')) {
-      categories = allowedCategoriesList;
-    } else {
-      String allowedCategoriesString = allowedCategoriesList.join(', ');
-      for (String category in categories) {
-        if (!allowedCategories.contains(category)) {
-          fail('Error: unsupported library category "$category", '
-               'supported categories are: $allowedCategoriesString');
-        }
-      }
-    }
-    passThrough('--categories=${categories.join(",")}');
-  }
-
-  checkGlobalName(String argument) {
-    String globalName = extractParameter(argument);
-    if (!new RegExp(r'^\$[a-z]*$').hasMatch(globalName)) {
-      fail('Error: "$globalName" must match "\\\$[a-z]*"');
-    }
-    passThrough(argument);
-  }
-
-  handleShortOptions(String argument) {
-    var shortOptions = argument.substring(1).split("");
-    for (var shortOption in shortOptions) {
-      switch (shortOption) {
-        case 'v':
-          setVerbose(null);
-          break;
-        case 'h':
-        case '?':
-          wantHelp = true;
-          break;
-        case 'c':
-          passThrough('--enable-checked-mode');
-          break;
-        default:
-          throw 'Internal error: "$shortOption" did not match';
-      }
-    }
-  }
-
-  Uri computePrecompiledUri() {
-    String extension = 'precompiled.js';
-    String outPath = out.path;
-    if (outPath.endsWith('.js')) {
-      outPath = outPath.substring(0, outPath.length - 3);
-      return out.resolve('$outPath.$extension');
-    } else {
-      return out.resolve(extension);
-    }
-  }
-
-  List<String> arguments = <String>[];
-  List<OptionHandler> handlers = <OptionHandler>[
-    new OptionHandler('-[chv?]+', handleShortOptions),
-    new OptionHandler('--throw-on-error',
-                      (_) => diagnosticHandler.throwOnError = true),
-    new OptionHandler('--suppress-warnings',
-                      (_) => diagnosticHandler.showWarnings = false),
-    new OptionHandler('--suppress-hints',
-                      (_) => diagnosticHandler.showHints = false),
-    new OptionHandler('--output-type=dart|--output-type=js', setOutputType),
-    new OptionHandler('--verbose', setVerbose),
-    new OptionHandler('--version', (_) => wantVersion = true),
-    new OptionHandler('--library-root=.+', setLibraryRoot),
-    new OptionHandler('--out=.+|-o.*', setOutput, multipleArguments: true),
-    new OptionHandler('--allow-mock-compilation', passThrough),
-    new OptionHandler('--minify', passThrough),
-    new OptionHandler('--force-strip=.*', setStrip),
-    new OptionHandler('--disable-diagnostic-colors',
-                      (_) => diagnosticHandler.enableColors = false),
-    new OptionHandler('--enable-diagnostic-colors',
-                      (_) => diagnosticHandler.enableColors = true),
-    new OptionHandler('--enable[_-]checked[_-]mode|--checked',
-                      (_) => passThrough('--enable-checked-mode')),
-    new OptionHandler('--enable-concrete-type-inference',
-                      (_) => passThrough('--enable-concrete-type-inference')),
-    new OptionHandler('--trust-type-annotations',
-                      (_) => passThrough('--trust-type-annotations')),
-    new OptionHandler(r'--help|/\?|/h', (_) => wantHelp = true),
-    new OptionHandler('--package-root=.+|-p.+', setPackageRoot),
-    new OptionHandler('--analyze-all', passThrough),
-    new OptionHandler('--analyze-only', setAnalyzeOnly),
-    new OptionHandler('--analyze-signatures-only', passThrough),
-    new OptionHandler('--disable-native-live-type-analysis', passThrough),
-    new OptionHandler('--categories=.*', setCategories),
-    new OptionHandler('--global-js-name=.*', checkGlobalName),
-    new OptionHandler('--disable-type-inference', passThrough),
-    new OptionHandler('--terse', passThrough),
-    new OptionHandler('--disallow-unsafe-eval',
-                      (_) => hasDisallowUnsafeEval = true),
-    new OptionHandler('-D.+=.*', addInEnvironment),
-
-    // The following two options must come last.
-    new OptionHandler('-.*', (String argument) {
-      helpAndFail('Error: Unknown option "$argument".');
-    }),
-    new OptionHandler('.*', (String argument) {
-      arguments.add(nativeToUriPath(argument));
-    })
-  ];
-
-  parseCommandLine(handlers, argv);
-  if (wantHelp || wantVersion) {
-    helpAndExit(wantHelp, wantVersion, diagnosticHandler.verbose);
-  }
-
-  if (hasDisallowUnsafeEval) {
-    String precompiledName =
-        relativize(currentDirectory, computePrecompiledUri(), isWindows);
-    helpAndFail("Error: option '--disallow-unsafe-eval' has been removed."
-                " Instead, the compiler generates a file named"
-                " '$precompiledName'.");
-  }
-
-  if (outputLanguage != OUTPUT_LANGUAGE_DART && stripArgumentSet) {
-    helpAndFail('Error: --force-strip may only be used with '
-        '--output-type=dart');
-  }
-  if (arguments.isEmpty) {
-    helpAndFail('Error: No Dart file specified.');
-  }
-  if (arguments.length > 1) {
-    var extra = arguments.sublist(1);
-    helpAndFail('Error: Extra arguments: ${extra.join(" ")}');
-  }
-
-  Uri uri = currentDirectory.resolve(arguments[0]);
-  if (packageRoot == null) {
-    packageRoot = uri.resolve('./packages/');
-  }
-
-  diagnosticHandler.info('package root is $packageRoot');
-
-  int totalCharactersWritten = 0;
-
-  options.add('--source-map=$sourceMapOut');
-
-  compilationDone(String code) {
-    if (analyzeOnly) return;
-    if (code == null) {
-      fail('Error: Compilation failed.');
-    }
-    writeString(Uri.parse('$out.deps'),
-                getDepsOutput(inputProvider.sourceFiles));
-    diagnosticHandler.info(
-         'compiled ${inputProvider.dartCharactersRead} characters Dart '
-         '-> $totalCharactersWritten characters $outputLanguage '
-         'in ${relativize(currentDirectory, out, isWindows)}');
-    if (!explicitOut) {
-      String input = uriPathToNative(arguments[0]);
-      String output = relativize(currentDirectory, out, isWindows);
-      print('Dart file ($input) compiled to $outputLanguage: $output');
-    }
-  }
-
-  EventSink<String> outputProvider(String name, String extension) {
-    Uri uri;
-    String sourceMapFileName;
-    bool isPrimaryOutput = false;
-    if (name == '') {
-      if (extension == 'js' || extension == 'dart') {
-        isPrimaryOutput = true;
-        uri = out;
-        sourceMapFileName =
-            sourceMapOut.path.substring(sourceMapOut.path.lastIndexOf('/') + 1);
-      } else if (extension == 'precompiled.js') {
-        uri = computePrecompiledUri();
-        diagnosticHandler.info(
-            "File ($uri) is compatible with header"
-            " \"Content-Security-Policy: script-src 'self'\"");
-      } else if (extension == 'js.map' || extension == 'dart.map') {
-        uri = sourceMapOut;
-      } else {
-        fail('Error: Unknown extension: $extension');
-      }
-    } else {
-      uri = out.resolve('$name.$extension');
-    }
-
-    if (uri.scheme != 'file') {
-      fail('Error: Unhandled scheme ${uri.scheme} in $uri.');
-    }
-
-    RandomAccessFile output =
-        new File(uriPathToNative(uri.path)).openSync(mode: FileMode.WRITE);
-    int charactersWritten = 0;
-
-    writeStringSync(String data) {
-      // Write the data in chunks of 8kb, otherwise we risk running OOM
-      int chunkSize = 8*1024;
-
-      int offset = 0;
-      while (offset < data.length) {
-        output.writeStringSync(
-            data.substring(offset, math.min(offset + chunkSize, data.length)));
-        offset += chunkSize;
-      }
-      charactersWritten += data.length;
-    }
-
-    onDone() {
-      if (sourceMapFileName != null) {
-        // Using # is the new proposed standard. @ caused problems in Internet
-        // Explorer due to "Conditional Compilation Statements" in JScript,
-        // see:
-        // http://msdn.microsoft.com/en-us/library/7kx09ct1(v=vs.80).aspx
-        // About source maps, see:
-        // https://docs.google.com/a/google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k/edit
-        // TODO(http://dartbug.com/11914): Remove @ line.
-        String sourceMapTag = '''
-
-//# sourceMappingURL=$sourceMapFileName
-//@ sourceMappingURL=$sourceMapFileName
-''';
-        writeStringSync(sourceMapTag);
-      }
-      output.closeSync();
-      if (isPrimaryOutput) {
-        totalCharactersWritten += charactersWritten;
-      }
-    }
-
-    return new EventSinkWrapper(writeStringSync, onDone);
-  }
-
-  return api.compile(uri, libraryRoot, packageRoot,
-              inputProvider, diagnosticHandler,
-              options, outputProvider, environment)
-            .then(compilationDone);
-}
-
 class EventSinkWrapper extends EventSink<String> {
   var onAdd, onClose;
 
   EventSinkWrapper(this.onAdd, this.onClose);
 
   void add(String data) => onAdd(data);
 
   void addError(error, [StackTrace stackTrace]) => throw error;
 
   void close() => onClose();
 }
 
 class AbortLeg {
   final message;
   AbortLeg(this.message);
   toString() => 'Aborted due to --throw-on-error: $message';
 }
 
-void writeString(Uri uri, String text) {
-  if (uri.scheme != 'file') {
-    fail('Error: Unhandled scheme ${uri.scheme}.');
-  }
-  var file = new File(uriPathToNative(uri.path)).openSync(mode: FileMode.WRITE);
-  file.writeStringSync(text);
-  file.closeSync();
-}
-
-void fail(String message) {
-  if (diagnosticHandler != null) {
-    diagnosticHandler.diagnosticHandler(
-        null, -1, -1, message, api.Diagnostic.ERROR);
-  } else {
-    print(message);
-  }
-  exit(1);
-}
-
-Future compilerMain(List<String> arguments) {
-  var root = uriPathToNative("/$LIBRARY_ROOT");
-  arguments = <String>['--library-root=${Platform.script.toFilePath()}$root']
-      ..addAll(arguments);
-  return compile(arguments);
-}
-
 void help() {
   // This message should be no longer than 20 lines. The default
   // terminal size normally 80x24. Two lines are used for the prompts
   // before and after running the compiler. Another two lines may be
   // used to print an error message.
   print('''
 Usage: dart2js [options] dartfile
 
 Compiles Dart to JavaScript.
 
@@ skipping 90 matching lines @@
     all categories, use --categories=all.
 
   --global-js-name=<name>
     By default, dart2js generates JavaScript output that uses a global
     variable named "$".  The name of this global can be overridden
     with this option.  The name must match the regular expression "\$[a-z]*".
 
 '''.trim());
 }
 
-void helpAndExit(bool wantHelp, bool wantVersion, bool verbose) {
-  if (wantVersion) {
-    var version = (BUILD_ID == null)
-        ? '<non-SDK build>'
-        : BUILD_ID;
-    print('Dart-to-JavaScript compiler (dart2js) version: $version');
-  }
-  if (wantHelp) {
-    if (verbose) {
-      verboseHelp();
+Future internalMain(Function exitFunc, Function compileFunc,
+                    List<String> arguments) {
+  var dart2js = new _Dart2Js(exitFunc, compileFunc);
+
+  onError(exception, trace) {
+    if (exception is CompilerCrashedException) {

[ahe, 2013/11/21 12:44:53]

This looks like a break down of the API to me.

CompilerCrashedException now belongs in ../compiler.dart, but I don't think the
concept CompilerCrashedException belongs there.

The idea is that this library also serves as a demonstration of how to use the
compiler API (but without importing implementation details).

This is also why I'm concerned about importing source_file.dart and
source_file_provider.dart: these are also becoming compiler implementation
details, and we have no separation between implementation details and compiler
API.

+      // Error and stack trace already reported.
+      exitFunc(253); // 253 is recognized as a crash by our test scripts.
     } else {
-      help();
+      try {
+        print('Internal error: $exception');
+      } catch (ignored) {
+        print('Internal error: error while printing exception');
+      }
+
+      try {
+        if (trace != null) {
+          print(trace);
+        }
+      } finally {
+        exitFunc(253); // 253 is recognized as a crash by our test scripts.
+      }
     }
   }
-  exit(0);
-}
 
-void helpAndFail(String message) {
-  help();
-  print('');
-  fail(message);
+  try {
+    return dart2js.compilerMain(arguments).catchError(onError);
+  } catch (exception, trace) {
+    onError(exception, trace);
+    return new Future.value();
+  }
 }
 
 void main(List<String> arguments) {
-  runZoned(() => compilerMain(arguments), onError: (exception, trace) {
-    try {
-      print('Internal error: $exception');
-    } catch (ignored) {
-      print('Internal error: error while printing exception');
-    }
-
-    try {
-      if (trace != null) {
-        print(trace);
-      }
-    } finally {
-      exit(253); // 253 is recognized as a crash by our test scripts.
-    }
-  });
+  internalMain(exit, api.compile, arguments);
 }