Move scanner into pkg/front_end/lib/src/scanner.

pkg/front_end/lib/src/scanner/interner.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file

[Brian Wilkerson, 2016/11/08 20:53:23]

We should be consistent about updating or not updating the copyright. (I don't
see any value in updating it, but I don't have a strong preference.)

[Paul Berry, 2016/11/08 21:47:06]

The only value I see in updating it is that as files get moved from the analyzer
to the front end, there won't always be a simple 1-to-1 relationship between the
old file and the new file, so if we want to keep the old copyright dates, it
won't always be obvious which date is the "old" one.  So I opted to consistently
update all the copyright dates.

[Brian Wilkerson, 2016/11/08 22:01:23]

In that case, you missed two files. :-) (Hence the observation.)

[Paul Berry, 2016/11/08 22:06:02]

Whoops, thank you.  Please see https://codereview.chromium.org/2483313003/.

 // 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.interner;
-
-import 'dart:collection';
+library front_end.src.scanner.interner;
 
 /**
  * The interface `Interner` defines the behavior of objects that can intern
  * strings.
  */
 abstract class Interner {
   /**
    * Return a string that is identical to all of the other strings that have
    * been interned that are equal to the given [string].
    */
   String intern(String string);
 }
 
 /**
- * The class `MappedInterner` implements an interner that uses a map to manage
- * the strings that have been interned.
- */
-class MappedInterner implements Interner {
-  /**
-   * A table mapping strings to themselves.
-   */
-  Map<String, String> _table = new HashMap<String, String>();
-
-  @override
-  String intern(String string) {
-    String original = _table[string];
-    if (original == null) {
-      _table[string] = string;
-      return string;
-    }
-    return original;
-  }
-}
-
-/**
  * The class `NullInterner` implements an interner that does nothing (does not
  * actually intern any strings).
  */
 class NullInterner implements Interner {
   @override
   String intern(String string) => string;
 }