Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

sdk/lib/_internal/compiler/implementation/util/indentation.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.
-
-part of dart2js.util;
-
-/// Indentation utility class. Should be used as a mixin in most cases.
-class Indentation {
-  /// The current indentation string.
-  String get indentation {
-    // Lazily add new indentation strings as required.
-    for (int i = _indentList.length; i <= _indentLevel; i++) {
-      _indentList.add(_indentList[i - 1] + indentationUnit);
-    }
-    return _indentList[_indentLevel];
-  }
-
-  /// The current indentation level.
-  int _indentLevel = 0;
-
-  /// A cache of all indentation strings used so far.
-  /// Always at least of length 1.
-  List<String> _indentList = <String>[""];
-
-  /// The indentation unit, defaulting to two spaces. May be overwritten.
-  String _indentationUnit = "  ";
-  String get indentationUnit => _indentationUnit;
-         set indentationUnit(String value) {
-           if (value != _indentationUnit) {
-             _indentationUnit = value;
-             _indentList = <String>[""];
-           }
-         }
-
-  /// Increases the current level of indentation.
-  void indentMore() {
-    _indentLevel++;
-  }
-
-  /// Decreases the current level of indentation.
-  void indentLess() {
-    _indentLevel--;
-  }
-
-  /// Calls [f] with one more indentation level, restoring indentation context
-  /// upon return of [f] and returning its result.
-  indentBlock(Function f) {
-    indentMore();
-    var result = f();
-    indentLess();
-    return result;
-  }
-}