Import analysis_services.dart into analysis_server.dart.

pkg/analysis_services/lib/src/correction/selection_analyzer.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 services.src.correction.selection_analyzer;
-
-import 'package:analysis_services/src/correction/source_range.dart';
-import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/source.dart';
-
-
-/**
- * A visitor for visiting [AstNode]s covered by a selection [SourceRange].
- */
-class SelectionAnalyzer extends GeneralizingAstVisitor<Object> {
-  final SourceRange selection;
-
-  AstNode _coveringNode;
-  List<AstNode> _selectedNodes;
-
-  SelectionAnalyzer(this.selection);
-
-  /**
-   * Return the [AstNode] with the shortest length which completely covers the
-   * specified selection.
-   */
-  AstNode get coveringNode => _coveringNode;
-
-  /**
-   * Returns the first selected [AstNode], may be `null`.
-   */
-  AstNode get firstSelectedNode {
-    if (_selectedNodes == null || _selectedNodes.isEmpty) {
-      return null;
-    }
-    return _selectedNodes[0];
-  }
-
-  /**
-   * Returns `true` if there are [AstNode]s fully covered by the
-   * selection [SourceRange].
-   */
-  bool get hasSelectedNodes =>
-      _selectedNodes != null && !_selectedNodes.isEmpty;
-
-  /**
-   * Returns `true` if there was no selected nodes yet.
-   */
-  bool get isFirstNode => _selectedNodes == null;
-
-  /**
-   * Returns the last selected [AstNode], may be `null`.
-   */
-  AstNode get lastSelectedNode {
-    if (_selectedNodes == null || _selectedNodes.isEmpty) {
-      return null;
-    }
-    return _selectedNodes[_selectedNodes.length - 1];
-  }
-
-  /**
-   * Returns the [SourceRange] which covers selected [AstNode]s, may be `null`
-   * if there are no [AstNode]s under the selection.
-   */
-  SourceRange get selectedNodeRange {
-    if (_selectedNodes == null || _selectedNodes.isEmpty) {
-      return null;
-    }
-    AstNode firstNode = _selectedNodes[0];
-    AstNode lastNode = _selectedNodes[_selectedNodes.length - 1];
-    return rangeStartEnd(firstNode, lastNode);
-  }
-
-  /**
-   * Return the [AstNode]s fully covered by the selection [SourceRange].
-   */
-  List<AstNode> get selectedNodes {
-    if (_selectedNodes == null || _selectedNodes.isEmpty) {
-      return [];
-    }
-    return _selectedNodes;
-  }
-
-  /**
-   * Adds first selected [AstNode].
-   */
-  void handleFirstSelectedNode(AstNode node) {
-    _selectedNodes = [];
-    _selectedNodes.add(node);
-  }
-
-  /**
-   * Adds second or more selected [AstNode].
-   */
-  void handleNextSelectedNode(AstNode node) {
-    if (firstSelectedNode.parent == node.parent) {
-      _selectedNodes.add(node);
-    }
-  }
-
-  /**
-   * Notifies that selection ends in given [AstNode].
-   */
-  void handleSelectionEndsIn(AstNode node) {
-  }
-
-  /**
-   * Notifies that selection starts in given [AstNode].
-   */
-  void handleSelectionStartsIn(AstNode node) {
-  }
-
-  /**
-   * Resets selected nodes.
-   */
-  void reset() {
-    _selectedNodes = null;
-  }
-
-  @override
-  Object visitNode(AstNode node) {
-    SourceRange nodeRange = rangeNode(node);
-    if (selection.covers(nodeRange)) {
-      if (isFirstNode) {
-        handleFirstSelectedNode(node);
-      } else {
-        handleNextSelectedNode(node);
-      }
-      return null;
-    } else if (selection.coveredBy(nodeRange)) {
-      _coveringNode = node;
-      node.visitChildren(this);
-      return null;
-    } else if (selection.startsIn(nodeRange)) {
-      handleSelectionStartsIn(node);
-      node.visitChildren(this);
-      return null;
-    } else if (selection.endsIn(nodeRange)) {
-      handleSelectionEndsIn(node);
-      node.visitChildren(this);
-      return null;
-    }
-    // no intersection
-    return null;
-  }
-}