Initial cut for a development server

lib/src/report.dart

 // Copyright (c) 2015, 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.
 
 /// Summarizes the information produced by the checker.
 library ddc.src.report;
 
 import 'dart:math' show max;
 
 import 'package:path/path.dart' as path;
@@ skipping 59 matching lines @@
         level, span.message('[from analyzer]: ${message}', color: color));
   }
 }
 
 /// A reporter that gathers all the information in a [GlobalSummary].
 class SummaryReporter implements CheckerReporter {
   GlobalSummary result = new GlobalSummary();
   LibrarySummary _currentLibrary;
   SourceFile _file;
 
+  clear() {
+    result = new GlobalSummary();
+  }
+
   void enterLibrary(LibraryInfo lib) {
     var libKey = '${lib.library.source.uri}';
     var libSummary = _currentLibrary = new LibrarySummary(libKey);
 
     var uri = lib.library.source.uri;
     if (uri.scheme == 'package') {
       var pname = path.split(uri.path)[0];
       result.packages.putIfAbsent(pname, () => new PackageSummary(pname));
       if (result.packages[pname].libraries[libKey] != null) {
         print('ERROR: duplicate ${libKey}');
@@ skipping 392 matching lines @@
     var kind = message.kind;
     errorCount.putIfAbsent(currentPackage, () => <String, int>{});
     errorCount[currentPackage].putIfAbsent(kind, () => 0);
     errorCount[currentPackage][kind]++;
     totals.putIfAbsent(kind, () => 0);
     totals[kind]++;
   }
 }
 
 /// Returns a [SourceSpan] in [file] for the offsets of [node].
+// TODO(sigmund): convert to use span information from AST (issue #73)
 SourceSpan _spanForNode(SourceFile file, AstNode node) {
   final begin = node is AnnotatedNode
       ? node.firstTokenAfterCommentAndMetadata.offset
       : node.offset;
   return file.span(begin, node.end);
 }