Remove backends.

compiler/java/com/google/dart/compiler/backend/dart/DartBackend.java

Index: compiler/java/com/google/dart/compiler/backend/dart/DartBackend.java
diff --git a/compiler/java/com/google/dart/compiler/backend/dart/DartBackend.java b/compiler/java/com/google/dart/compiler/backend/dart/DartBackend.java
deleted file mode 100644
index 1cbccf86c671ed0d38462985417fe4882e872ee8..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/dart/DartBackend.java
+++ /dev/null
@@ -1,99 +0,0 @@
-// Copyright (c) 2011, 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.
-
-package com.google.dart.compiler.backend.dart;
-
-import com.google.common.io.CharStreams;
-import com.google.common.io.Closeables;
-import com.google.dart.compiler.Backend;
-import com.google.dart.compiler.DartCompilerContext;
-import com.google.dart.compiler.DartSource;
-import com.google.dart.compiler.LibrarySource;
-import com.google.dart.compiler.ast.DartToSourceVisitor;
-import com.google.dart.compiler.ast.DartUnit;
-import com.google.dart.compiler.ast.LibraryUnit;
-import com.google.dart.compiler.resolver.CoreTypeProvider;
-import com.google.dart.compiler.util.DefaultTextOutput;
-import com.google.dart.compiler.util.TextOutput;
-
-import java.io.IOException;
-import java.io.Reader;
-import java.io.Writer;
-import java.util.Collection;
-
-/**
- * A compiler backend that produces optimized Dart.
- */
-public class DartBackend implements Backend {
-
-  public static final String EXTENSION_DART = "opt.dart";
-
-  private static void packageLibs(Collection<LibraryUnit> libraries,
-                                  Writer w,
-                                  DartCompilerContext context)
-      throws IOException {
-    for (LibraryUnit libUnit : libraries) {
-      for (DartUnit unit : libUnit.getUnits()) {
-        DartSource src = unit.getSource();
-        if (src != null) {
-          Reader r = context.getArtifactReader(src, "", EXTENSION_DART);
-          boolean failed = true;
-          try {
-            CharStreams.copy(r, w);
-            failed = false;
-          } finally {
-            Closeables.close(r, failed);
-          }
-        }
-      }
-    }
-  }
-
-  @Override
-  public boolean isOutOfDate(DartSource src, DartCompilerContext context) {
-    return context.isOutOfDate(src, src, EXTENSION_DART);
-  }
-
-  @Override
-  public void compileUnit(DartUnit unit, DartSource src,
-      DartCompilerContext context, CoreTypeProvider typeProvider) throws IOException {
-    // Generate Javascript output.
-    TextOutput out = new DefaultTextOutput(false);
-    DartToSourceVisitor srcGenerator = new DartToSourceVisitor(out);
-    srcGenerator.accept(unit);
-    Writer w = context.getArtifactWriter(src, "", EXTENSION_DART);
-    boolean failed = true;
-    try {
-      w.write(out.toString());
-      failed = false;
-    } finally {
-      Closeables.close(w, failed);
-    }
-  }
-
-  @Override
-  public void packageApp(LibrarySource app,
-                         Collection<LibraryUnit> libraries,
-                         DartCompilerContext context,
-                         CoreTypeProvider typeProvider) throws IOException {
-    Writer out = context.getArtifactWriter(app, "", EXTENSION_DART);
-    boolean failed = true;
-    try {
-      // Emit the concatenated Javascript sources in dependency order.
-      packageLibs(libraries, out, context);
-
-      // Emit entry point call.
-      // TODO: How does a dart app start?
-      // out.write(app.getEntryMethod() + "();");
-      failed = false;
-    } finally {
-      Closeables.close(out, failed);
-    }
-  }
-
-  @Override
-  public String getAppExtension() {
-    return EXTENSION_DART;
-  }
-}