[dart2dart] Make removal of asserts and forcing type strips go under

lib/compiler/implementation/dart2js.dart

 // Copyright (c) 2012, 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');
 
 #import('dart:io');
 #import('dart:uri');
 #import('dart:utf');
 
 #import('../compiler.dart', prefix: 'api');
 #import('colors.dart', prefix: 'colors');
 #import('source_file.dart');
 #import('filenames.dart');
 #import('util/uri_extras.dart');
 
 const String LIBRARY_ROOT = '../../../..';
+const String OUTPUT_LANGUAGE_DART = 'Dart';
 
 typedef void HandleOption(String option);
 
 class OptionHandler {
   String pattern;
   HandleOption handle;
 
   OptionHandler(this.pattern, this.handle);
 }
 
@@ skipping 44 matching lines @@
   bool verbose = false;
   Uri libraryRoot = cwd;
   Uri out = cwd.resolve('out.js');
   Uri sourceMapOut = cwd.resolve('out.js.map');
   Uri packageRoot = null;
   List<String> options = new List<String>();
   bool explicitOut = false;
   bool wantHelp = false;
   bool enableColors = false;
   String outputLanguage = 'JavaScript';
+  bool stripArgumentSet = false;
 
   passThrough(String argument) => options.add(argument);
 
   setLibraryRoot(String argument) {
     libraryRoot = cwd.resolve(extractPath(argument));
   }
 
   setPackageRoot(String argument) {
     packageRoot = cwd.resolve(extractPath(argument));
   }
 
   setOutput(String argument) {
     explicitOut = true;
     out = cwd.resolve(nativeToUriPath(extractParameter(argument)));
     sourceMapOut = new Uri.fromString('$out.map');
   }
 
   setOutputType(String argument) {
     if (argument == '--output-type=dart') {
-      outputLanguage = 'Dart';
+      outputLanguage = OUTPUT_LANGUAGE_DART;
       if (!explicitOut) {
         out = cwd.resolve('out.dart');
         sourceMapOut = cwd.resolve('out.dart.map');
       }
     }
     passThrough(argument);
   }
 
+  setStrip(String argument) {
+    stripArgumentSet = true;
+    passThrough(argument);
+  }
+
   handleShortOptions(String argument) {
     var shortOptions = argument.substring(1).splitChars();
     for (var shortOption in shortOptions) {
       switch (shortOption) {
         case 'v':
           verbose = true;
           break;
         case 'h':
         case '?':
           wantHelp = true;
@@ skipping 11 matching lines @@
   List<OptionHandler> handlers = <OptionHandler>[
     new OptionHandler('-[chv?]+', handleShortOptions),
     new OptionHandler('--throw-on-error', (_) => throwOnError = true),
     new OptionHandler('--suppress-warnings', (_) => showWarnings = false),
     new OptionHandler('--output-type=dart|--output-type=js', setOutputType),
     new OptionHandler('--verbose', (_) => verbose = true),
     new OptionHandler('--library-root=.+', setLibraryRoot),
     new OptionHandler('--out=.+|-o.+', setOutput),
     new OptionHandler('--allow-mock-compilation', passThrough),
     new OptionHandler('--minify', passThrough),
-    new OptionHandler('--force-cut-declaration-types', passThrough),
+    new OptionHandler('--force-strip=.*', setStrip),
     // TODO(ahe): Remove the --no-colors option.
     new OptionHandler('--disable-diagnostic-colors', (_) => enableColors = false),
     new OptionHandler('--enable-diagnostic-colors', (_) => enableColors = true),
     new OptionHandler('--enable[_-]checked[_-]mode|--checked',
                       (_) => passThrough('--enable-checked-mode')),
     new OptionHandler(r'--help|/\?|/h', (_) => wantHelp = true),
     new OptionHandler(r'--package-root=.+|-p.+', setPackageRoot),
     // 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) helpAndExit(verbose);
 
+  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.getRange(1, arguments.length - 1);
     helpAndFail('Error: Extra arguments: ${Strings.join(extra, " ")}');
   }
 
   Map<String, SourceFile> sourceFiles = <String, SourceFile>{};
   int dartBytesRead = 0;
@@ skipping 228 matching lines @@
     } catch (ignored) {
       print('Internal error: error while printing exception');
     }
     try {
       print(trace);
     } finally {
       exit(253); // 253 is recognized as a crash by our test scripts.
     }
   }
 }