Launch Leg independently of Frog.

dart/utils/compiler/dart2js.dart

Index: dart/utils/compiler/dart2js.dart
diff --git a/dart/utils/compiler/dart2js.dart b/dart/utils/compiler/dart2js.dart
index 100f2eb33f8d855978937ff58a07d3e46431acd9..2481feae790334dad8562d119cf708bd9af78c93 100644
--- a/dart/utils/compiler/dart2js.dart
+++ b/dart/utils/compiler/dart2js.dart
@@ -2,12 +2,16 @@
 // 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('frog_leg');
+#library('dart2js');
+
+#import('dart:io');
+#import('dart:utf');
 
 #import('../../lib/uri/uri.dart');
-#import('../lang.dart', prefix: 'frog');
-#import('api.dart', prefix: 'api');
-#import('io/io.dart', prefix: 'io');
+#import('../../frog/leg/api.dart', prefix: 'api');
+#import('../../frog/leg/io/io.dart', prefix: 'io');
+#import('../../frog/leg/colors.dart');
+#import('source_file.dart');
 
 String relativize(Uri base, Uri uri) {
   if (base.scheme == 'file' &&
@@ -39,53 +43,89 @@ String relativize(Uri base, Uri uri) {
   return uri.toString();
 }
 
-bool compile(frog.World world) {
-  final throwOnError = frog.options.throwOnErrors;
-  final showWarnings = frog.options.showWarnings;
-  // final compiler = new WorldCompiler(world, throwOnError);
+void compile(List<String> argv) {
   Uri cwd = new Uri(scheme: 'file', path: io.getCurrentDirectory());
-  Uri uri = cwd.resolve(frog.options.dartScript);
-  String frogLibDir = frog.options.libDir;
-  if (!frogLibDir.endsWith("/")) frogLibDir = "$frogLibDir/";
-  Uri frogLib = new Uri(scheme: 'file', path: frogLibDir);
-  Uri libraryRoot = frogLib.resolve('../leg/lib/');
-  Map<String, frog.SourceFile> sourceFiles = <frog.SourceFile>{};
+  bool throwOnError = false;
+  bool showWarnings = true;
+  bool verbose = false;
+  Uri libraryRoot = cwd;
+  Uri out = cwd.resolve('out.js');
+
+  List<String> arguments = <String>[];
+  for (String argument in argv) {
+    if ('--throw-on-error' == argument) {
+      throwOnError = true;
+    } else if ('--suppress-warnings' == argument) {
+      showWarnings = false;
+    } else if ('--verbose' == argument) {
+      verbose = true;
+    } else if (argument.startsWith('--library-root=')) {
+      String path = argument.substring(argument.indexOf('=') + 1);
+      if (!path.endsWith("/")) path = "$path/";
+      libraryRoot = cwd.resolve(path);
+    } else if (argument.startsWith('--out=')) {
+      String path = argument.substring(argument.indexOf('=') + 1);
+      out = cwd.resolve(path);
+    } else if (argument.startsWith('-')) {
+      throw new AbortLeg('unknown option $argument');
+    } else {
+      arguments.add(argument);
+    }
+  }
+  if (arguments.isEmpty()) {
+    throw new AbortLeg('no files to compile');
+  }
+  if (arguments.length > 1) {
+    var extra = arguments.getRange(1, arguments.length - 1);
+    throw new AbortLeg('extra arguments: $extra');
+  }
+
+  Map<String, SourceFile> sourceFiles = <SourceFile>{};
+  int dartBytesRead = 0;
 
   Future<String> provider(Uri uri) {
     if (uri.scheme != 'file') {
       throw new IllegalArgumentException(uri);
     }
-    String source = world.files.readAll(uri.path);
-    world.dartBytesRead += source.length;
+    String source = readAll(uri.path);
+    dartBytesRead += source.length;
     sourceFiles[uri.toString()] =
-      new frog.SourceFile(relativize(cwd, uri), source);
+      new SourceFile(relativize(cwd, uri), source);
     Completer<String> completer = new Completer<String>();
     completer.complete(source);
     return completer.future;
   }
 
+  void info(var message) {
+    if (verbose) print('${green("info:")} $message');
+  }
+
   void handler(Uri uri, int begin, int end, String message, bool fatal) {
     if (uri === null && !fatal) {
-      world.info('[leg] $message');
+      info(message);
       return;
     }
     if (uri === null) {
       assert(fatal);
       print(message);
     } else if (fatal || showWarnings) {
-      frog.SourceFile file = sourceFiles[uri.toString()];
+      SourceFile file = sourceFiles[uri.toString()];
       print(file.getLocationMessage(message, begin, end, true));
     }
     if (fatal && throwOnError) throw new AbortLeg(message);
   }
 
+  Uri uri = cwd.resolve(arguments[0]);
+  info('compiling $uri');
+
   // TODO(ahe): We expect the future to be complete and call value
   // directly. In effect, we don't support truly asynchronous API.
   String code = api.compile(uri, libraryRoot, provider, handler).value;
-  if (code === null) return false;
-  world.legCode = code;
-  world.jsBytesWritten = code.length;
-  return true;
+  if (code === null) throw new AbortLeg('compilation failed');
+  writeString(out, code);
+  int jsBytesWritten = code.length;
+  info('compiled $dartBytesRead bytes Dart -> $jsBytesWritten bytes JS '
+       + 'in ${relativize(cwd, out)}');
 }
 
 class AbortLeg {
@@ -93,3 +133,21 @@ class AbortLeg {
   AbortLeg(this.message);
   toString() => 'Aborted due to --throw-on-error: $message';
 }
+
+void writeString(Uri uri, String text) {
+  if (uri.scheme != 'file') {
+    throw new AbortLeg('unhandled scheme ${uri.scheme}');
+  }
+  var file = new File(uri.path).openSync(FileMode.WRITE);
+  file.writeStringSync(text);
+  file.closeSync();
+}
+
+String readAll(String filename) {
+  var file = (new File(filename)).openSync();
+  var length = file.lengthSync();
+  var buffer = new List<int>(length);
+  var bytes = file.readListSync(buffer, 0, length);
+  file.closeSync();
+  return new String.fromCharCodes(new Utf8Decoder(buffer).decodeRest());
+}