Fix the error message widget

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 dev_compiler.src.report;
 
 import 'dart:math' show max;
 
 import 'package:analyzer/src/generated/engine.dart' show AnalysisContext;
@@ skipping 119 matching lines @@
   }
 
   void onError(AnalysisError error) {
     // Only summarize messages per configured logging level
     var code = error.errorCode;
     if (_severityToLevel[code.errorSeverity] < _level) return;
 
     var span = _toSpan(_context, error);
     var summary = _getIndividualSummary(error.source.uri);
     if (summary is LibrarySummary) {
-      summary.countSourceLines(_context, error.source);
+      summary.recordSourceLines(error.source.uri, () {
+        // TODO(jmesserly): parsing is serious overkill for this.
+        // Should be cached, but still.
+        // On the other hand, if we are going to parse, we could get a much better
+        // source lines of code estimate by excluding things like comments,
+        // blank lines, and closing braces.
+        var unit = _context.parseCompilationUnit(error.source);
+        return unit.lineInfo.getLocation(unit.endToken.end).lineNumber;
+      });
     }
     summary.messages.add(new MessageSummary(errorCodeName(code),
         code.errorSeverity.displayName, span, error.message));
   }
 
   // TODO(jmesserly): fix to not depend on SourceSpan. This will be really slow
   // because it will reload source text from disk, for every single message...
   SourceSpanWithContext _toSpan(AnalysisContext context, AnalysisError error) {
     var source = error.source;
     var lineInfo = context.computeLineInfo(source);
@@ skipping 202 matching lines @@
 
   visitMessage(MessageSummary message) {
     var kind = message.kind;
     errorCount.putIfAbsent(currentPackage, () => <String, int>{});
     errorCount[currentPackage].putIfAbsent(kind, () => 0);
     errorCount[currentPackage][kind]++;
     totals.putIfAbsent(kind, () => 0);
     totals[kind]++;
   }
 }