Update charted to 0.4.8 and roll

packages/string_scanner/lib/src/eager_span_scanner.dart

Index: packages/string_scanner/lib/src/eager_span_scanner.dart
diff --git a/packages/string_scanner/lib/src/eager_span_scanner.dart b/packages/string_scanner/lib/src/eager_span_scanner.dart
index 3fae5cca7cfdefa1017b8b6298d1680df1f8f34e..f80dce5c3f9a4bdf39e8e624aff00ae30b6ad9c8 100644
--- a/packages/string_scanner/lib/src/eager_span_scanner.dart
+++ b/packages/string_scanner/lib/src/eager_span_scanner.dart
@@ -2,8 +2,6 @@
 // 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 string_scanner.eager_span_scanner;
-
 import 'package:charcode/ascii.dart';
 
 import 'line_scanner.dart';
@@ -69,15 +67,26 @@ class EagerSpanScanner extends SpanScanner {
   EagerSpanScanner(String string, {sourceUrl, int position})
       : super(string, sourceUrl: sourceUrl, position: position);
 
+  bool scanChar(int character) {
+    if (!super.scanChar(character)) return false;
+    _adjustLineAndColumn(character);
+    return true;
+  }
+
   int readChar() {
-    var char = super.readChar();
-    if (char == $lf || (char == $cr && peekChar() != $lf)) {
+    var character = super.readChar();
+    _adjustLineAndColumn(character);
+    return character;
+  }
+
+  /// Adjusts [_line] and [_column] after having consumed [character].
+  void _adjustLineAndColumn(int character) {
+    if (character == $lf || (character == $cr && peekChar() != $lf)) {
       _line += 1;
       _column = 0;
     } else {
       _column += 1;
     }
-    return char;
   }
 
   bool scan(Pattern pattern) {