Find diagnostic locations for use in new compiler API.

dart/frog/leg/apiimpl.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('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;
   }
+
+  void reportDiagnostic(leg.SourceSpan span, String message, bool fatal) {
+    if (span === null) {
+      handler(null, null, null, message, fatal);
+    } else {
+      handler(span.uri, span.begin, span.end, message, fatal);
+    }
+  }
 }