Implement the compiler API and use it in frog_leg.dart.

dart/frog/leg/apiimpl.dart

Index: dart/frog/leg/apiimpl.dart
diff --git a/dart/frog/leg/apiimpl.dart b/dart/frog/leg/apiimpl.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6b29e5c4b9f4c20bf16c8ad077525db1025166c9
--- /dev/null
+++ b/dart/frog/leg/apiimpl.dart
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+// 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('leg_apiimpl');
+
+#import('leg.dart', prefix: 'leg');
+#import('ssa/tracer.dart', prefix: 'ssa');
+#import('../lang.dart', prefix: 'frog');
+
+class Compiler extends leg.Compiler {
+  ReadUriFromString provider;
+  DiagnosticHandler handler;
+  Uri libraryRoot;
+
+  Compiler(this.provider, this.handler, this.libraryRoot)
+    : super.withCurrentDirectory(null, tracer: new ssa.HTracer());
+
+  LibraryElement scanBuiltinLibrary(String filename) {
+    Uri uri = libraryRoot.resolve(filename);
+    LibraryElement library = scanner.loadLibrary(uri, null);
+    return library;
+  }
+
+  void log(message) {
+    handler(null, null, null, message, false);
+  }
+
+  Script readScript(Uri uri, [ScriptTag node]) {
+    String uriName = uri.toString();
+    // TODO(ahe): Clean this up.
+    if (uriName == 'dart:dom') {
+      uri = libraryRoot.resolve('../../../client/dom/frog/dom_frog.dart');
+    } else if (uriName == 'dart:html') {
+      uri = libraryRoot.resolve('../../../client/html/frog/html_frog.dart');
+    } else if (uriName == 'dart:json') {
+      uri = libraryRoot.resolve('../../../lib/json/json.dart');
+    }
+    String text = "";
+    try {
+      // TODO(ahe): We expect the future to be complete and call value
+      // directly. In effect, we don't support truly asynchronous API.
+      text = provider(uri).value;
+    } catch (var exception) {
+      cancel("${uri.path}: $exception", node: node);
+    }
+    frog.SourceFile sourceFile = new frog.SourceFile(uri.toString(), text);
+    return new leg.Script(uri, sourceFile);
+  }
+
+  bool run(Uri uri) {
+    bool success = super.run(uri);
+    for (final task in tasks) {
+      log('${task.name} took ${task.timing}msec');
+    }
+    return success;
+  }
+}