Produce LINE_INFO for HTML files.

pkg/analyzer/lib/src/task/html.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.
 
 library analyzer.src.task.html;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/plugin/engine_plugin.dart';
-import 'package:analyzer/src/task/dart.dart';
 import 'package:analyzer/src/task/general.dart';
 import 'package:analyzer/task/dart.dart';
 import 'package:analyzer/task/general.dart';
 import 'package:analyzer/task/html.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:html/dom.dart';
 import 'package:html/parser.dart';
 import 'package:source_span/source_span.dart';
 
 /**
@@ skipping 246 matching lines @@
    */
   static const String CONTENT_INPUT_NAME = 'CONTENT_INPUT_NAME';
 
   /**
    * The task descriptor describing this kind of task.
    */
   static final TaskDescriptor DESCRIPTOR = new TaskDescriptor(
       'ParseHtmlTask',
       createTask,
       buildInputs,
-      <ResultDescriptor>[HTML_DOCUMENT, HTML_DOCUMENT_ERRORS]);
+      <ResultDescriptor>[HTML_DOCUMENT, HTML_DOCUMENT_ERRORS, LINE_INFO]);
 
   /**
    * Initialize a newly created task to access the content of the source
    * associated with the given [target] in the given [context].
    */
   ParseHtmlTask(InternalAnalysisContext context, AnalysisTarget target)
       : super(context, target);
 
   @override
   TaskDescriptor get descriptor => DESCRIPTOR;
@@ skipping 11 matching lines @@
         if (exception != null) {
           message = exception.toString();
         }
       }
 
       outputs[HTML_DOCUMENT] = new Document();
       outputs[HTML_DOCUMENT_ERRORS] = <AnalysisError>[
         new AnalysisError(
             target.source, 0, 0, ScannerErrorCode.UNABLE_GET_CONTENT, [message])
       ];
+      outputs[LINE_INFO] = new LineInfo(<int>[0]);
     } else {
       HtmlParser parser = new HtmlParser(content, generateSpans: true);
       parser.compatMode = 'quirks';
       Document document = parser.parse();
+      //
+      // Convert errors.
+      //
       List<ParseError> parseErrors = parser.errors;
       List<AnalysisError> errors = <AnalysisError>[];
       for (ParseError parseError in parseErrors) {
         SourceSpan span = parseError.span;
         errors.add(new AnalysisError(target.source, span.start.offset,
             span.length, HtmlErrorCode.PARSE_ERROR, [parseError.message]));
       }
-
+      //
+      // Record outputs.
+      //
       outputs[HTML_DOCUMENT] = document;
       outputs[HTML_DOCUMENT_ERRORS] = errors;
+      outputs[LINE_INFO] = _computeLineInfo(content);
     }
   }
 
   /**
    * Return a map from the names of the inputs of this kind of task to the task
    * input descriptors describing those inputs for a task with the given
    * [source].
    */
   static Map<String, TaskInput> buildInputs(Source source) {
     return <String, TaskInput>{CONTENT_INPUT_NAME: CONTENT.of(source)};
   }
 
   /**
    * Create a [ParseHtmlTask] based on the given [target] in the given [context].
    */
   static ParseHtmlTask createTask(
       AnalysisContext context, AnalysisTarget target) {
     return new ParseHtmlTask(context, target);
   }
+
+  /**
+   * Compute [LineInfo] for the given [content].
+   */
+  static LineInfo _computeLineInfo(String content) {
+    List<int> lineStarts = <int>[0];
+    for (int index = 0; index < content.length; index++) {
+      if (content.codeUnitAt(index) == 0x0A) {
+        lineStarts.add(index + 1);
+      }
+    }
+    return new LineInfo(lineStarts);
+  }
 }
 
 /**
  * A fragment of a [DartScript].
  */
 class ScriptFragment {
   /**
    * The offset of the first character of the fragment, relative to the start of
    * the containing source.
    */
@@ skipping 14 matching lines @@
    * The content of the fragment.
    */
   final String content;
 
   /**
    * Initialize a newly created script fragment to have the given [offset] and
    * [content].
    */
   ScriptFragment(this.offset, this.line, this.column, this.content);
 }