Add a count of total lines to status performance page

pkg/analyzer/lib/src/generated/source.dart

 // Copyright (c) 2014, 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.generated.source;
 
 import 'dart:collection';
 import "dart:math" as math;
 
 import 'package:analyzer/file_system/file_system.dart';
@@ skipping 160 matching lines @@
   /**
    * Return `true` if the given URI is a `dart:` URI.
    *
    * @param uri the URI being tested
    * @return `true` if the given URI is a `dart:` URI
    */
   static bool isDartUri(Uri uri) => DART_SCHEME == uri.scheme;
 }
 
 /**
- * Instances of the class `LineInfo` encapsulate information about line and column information
- * within a source file.
+ * Information about line and column information within a source file.
  */
 class LineInfo {
   /**
-   * An array containing the offsets of the first character of each line in the source code.
+   * A list containing the offsets of the first character of each line in the
+   * source code.
    */
   final List<int> _lineStarts;
 
   /**
    * The zero-based [_lineStarts] index resulting from the last call to
    * [getLocation].
    */
   int _previousLine = 0;
 
   /**
-   * Initialize a newly created set of line information to represent the data encoded in the given
-   * array.
-   *
-   * @param lineStarts the offsets of the first character of each line in the source code
+   * Initialize a newly created set of line information to represent the data
+   * encoded in the given list of [_lineStarts].
    */
   LineInfo(this._lineStarts) {
     if (_lineStarts == null) {
       throw new IllegalArgumentException("lineStarts must be non-null");
     } else if (_lineStarts.length < 1) {
       throw new IllegalArgumentException("lineStarts must be non-empty");
     }
   }
 
   /**
-   * Return the location information for the character at the given offset.
-   *
-   * @param offset the offset of the character for which location information is to be returned
-   * @return the location information for the character at the given offset
+   * Return the number of lines in the file.
+   */
+  int get lineCount => _lineStarts.length;
+
+  /**
+   * Return the location information for the character at the given [offset].
    */
   LineInfo_Location getLocation(int offset) {
     var min = 0;
     var max = _lineStarts.length - 1;
 
     // Subsequent calls to [getLocation] are often for offsets near each other.
     // To take advantage of that, we cache the index of the line start we found
     // when this was last called. If the current offset is on that line or
     // later, we'll skip those early indices completely when searching.
     if (offset >= _lineStarts[_previousLine]) {
@@ skipping 871 matching lines @@
   Source resolveAbsolute(Uri uri, [Uri actualUri]);
 
   /**
    * Return an absolute URI that represents the given [source], or `null` if a
    * valid URI cannot be computed.
    *
    * The computation should be based solely on [source.fullName].
    */
   Uri restoreAbsolute(Source source) => null;
 }