Move index/search to services.

pkg/analyzer/lib/src/search/search_engine.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.
-
-// This code was auto-generated, is not intended to be edited, and is subject to
-// significant change. Please see the README file for more information.
-
-library engine.src.search_engine;
-
-///**
-// * Instances of the class <code>AndSearchPattern</code> implement a search pattern that matches
-// * elements that match all of several other search patterns.
-// */
-//class AndSearchPattern implements SearchPattern {
-//  /**
-//   * The patterns used to determine whether this pattern matches an element.
-//   */
-//  final List<SearchPattern> _patterns;
-//
-//  /**
-//   * Initialize a newly created search pattern to match elements that match all of several other
-//   * search patterns.
-//   *
-//   * @param patterns the patterns used to determine whether this pattern matches an element
-//   */
-//  AndSearchPattern(this._patterns);
-//
-//  @override
-//  MatchQuality matches(Element element) {
-//    MatchQuality highestQuality = null;
-//    for (SearchPattern pattern in _patterns) {
-//      MatchQuality quality = pattern.matches(element);
-//      if (quality == null) {
-//        return null;
-//      }
-//      if (highestQuality == null) {
-//        highestQuality = quality;
-//      } else {
-//        highestQuality = highestQuality.max(quality);
-//      }
-//    }
-//    return highestQuality;
-//  }
-//}
-//
-///**
-// * Instances of the class <code>CamelCaseSearchPattern</code> implement a search pattern that
-// * matches elements whose name matches a partial identifier where camel case conventions are used to
-// * perform what is essentially multiple prefix matches.
-// */
-//class CamelCaseSearchPattern implements SearchPattern {
-//  /**
-//   * The pattern that matching elements must match.
-//   */
-//  List<int> _pattern;
-//
-//  /**
-//   * A flag indicating whether the pattern and the name being matched must have exactly the same
-//   * number of parts (i.e. the same number of uppercase characters).
-//   */
-//  final bool _samePartCount;
-//
-//  /**
-//   * Initialize a newly created search pattern to match elements whose names match the given
-//   * camel-case pattern.
-//   *
-//   * @param pattern the pattern that matching elements must match
-//   * @param samePartCount `true` if the pattern and the name being matched must have
-//   *          exactly the same number of parts (i.e. the same number of uppercase characters)
-//   */
-//  CamelCaseSearchPattern(String pattern, this._samePartCount) {
-//    this._pattern = pattern.toCharArray();
-//  }
-//
-//  @override
-//  MatchQuality matches(Element element) {
-//    String name = element.displayName;
-//    if (name == null) {
-//      return null;
-//    }
-//    if (CharOperation.camelCaseMatch(_pattern, name.toCharArray(), _samePartCount)) {
-//      return MatchQuality.EXACT;
-//    }
-//    return null;
-//  }
-//}
-//
-///**
-// * Instances of the class `CountingSearchListener` listen for search results, passing those
-// * results on to a wrapped listener, but ensure that the wrapped search listener receives only one
-// * notification that the search is complete.
-// */
-//class CountingSearchListener implements SearchListener {
-//  /**
-//   * The number of times that this listener expects to be told that the search is complete before
-//   * passing the information along to the wrapped listener.
-//   */
-//  int _completionCount = 0;
-//
-//  /**
-//   * The listener that will be notified as results are received and when the given number of search
-//   * complete notifications have been received.
-//   */
-//  final SearchListener _wrappedListener;
-//
-//  /**
-//   * Initialize a newly created search listener to pass search results on to the given listener and
-//   * to notify the given listener that the search is complete after getting the given number of
-//   * notifications.
-//   *
-//   * @param completionCount the number of times that this listener expects to be told that the
-//   *          search is complete
-//   * @param wrappedListener the listener that will be notified as results are received
-//   */
-//  CountingSearchListener(int completionCount, this._wrappedListener) {
-//    this._completionCount = completionCount;
-//    if (completionCount == 0) {
-//      _wrappedListener.searchComplete();
-//    }
-//  }
-//
-//  @override
-//  void matchFound(SearchMatch match) {
-//    _wrappedListener.matchFound(match);
-//  }
-//
-//  @override
-//  void searchComplete() {
-//    _completionCount--;
-//    if (_completionCount <= 0) {
-//      _wrappedListener.searchComplete();
-//    }
-//  }
-//}
-//
-///**
-// * Instances of the class <code>ExactSearchPattern</code> implement a search pattern that matches
-// * elements whose name matches a specified identifier exactly.
-// */
-//class ExactSearchPattern implements SearchPattern {
-//  /**
-//   * The identifier that matching elements must be equal to.
-//   */
-//  final String _identifier;
-//
-//  /**
-//   * A flag indicating whether a case sensitive match is to be performed.
-//   */
-//  final bool _caseSensitive;
-//
-//  /**
-//   * Initialize a newly created search pattern to match elements whose names begin with the given
-//   * prefix.
-//   *
-//   * @param identifier the identifier that matching elements must be equal to
-//   * @param caseSensitive `true` if a case sensitive match is to be performed
-//   */
-//  ExactSearchPattern(this._identifier, this._caseSensitive);
-//
-//  @override
-//  MatchQuality matches(Element element) {
-//    String name = element.displayName;
-//    if (name == null) {
-//      return null;
-//    }
-//    if (_caseSensitive && name == _identifier) {
-//      return MatchQuality.EXACT;
-//    }
-//    if (!_caseSensitive && javaStringEqualsIgnoreCase(name, _identifier)) {
-//      return MatchQuality.EXACT;
-//    }
-//    return null;
-//  }
-//}
-//
-///**
-// * Instances of the class <code>FilteredSearchListener</code> implement a search listener that
-// * delegates to another search listener after removing matches that do not pass a given filter.
-// */
-//class FilteredSearchListener extends WrappedSearchListener {
-//  /**
-//   * The filter used to filter the matches.
-//   */
-//  final SearchFilter _filter;
-//
-//  /**
-//   * Initialize a newly created search listener to pass on any matches that pass the given filter to
-//   * the given listener.
-//   *
-//   * @param filter the filter used to filter the matches
-//   * @param listener the search listener being wrapped
-//   */
-//  FilteredSearchListener(this._filter, SearchListener listener) : super(listener);
-//
-//  @override
-//  void matchFound(SearchMatch match) {
-//    if (_filter.passes(match)) {
-//      propagateMatch(match);
-//    }
-//  }
-//}
-//
-///**
-// * [SearchListener] used by [SearchEngineImpl] internally to gather asynchronous results
-// * and return them synchronously.
-// */
-//class GatheringSearchListener implements SearchListener {
-//  /**
-//   * A list containing the matches that have been found so far.
-//   */
-//  List<SearchMatch> _matches = [];
-//
-//  /**
-//   * A flag indicating whether the search is complete.
-//   */
-//  bool _isComplete = false;
-//
-//  /**
-//   * @return the the matches that have been found.
-//   */
-//  List<SearchMatch> get matches {
-//    _matches.sort(SearchMatch.SORT_BY_ELEMENT_NAME);
-//    return _matches;
-//  }
-//
-//  /**
-//   * Return `true` if the search is complete.
-//   *
-//   * @return `true` if the search is complete
-//   */
-//  bool get isComplete => _isComplete;
-//
-//  @override
-//  void matchFound(SearchMatch match) {
-//    _matches.add(match);
-//  }
-//
-//  @override
-//  void searchComplete() {
-//    _isComplete = true;
-//  }
-//}
-//
-///**
-// * Instances of the class <code>LibrarySearchScope</code> implement a search scope that encompasses
-// * everything in a given collection of libraries.
-// */
-//class LibrarySearchScope implements SearchScope {
-//  /**
-//   * The libraries defining which elements are included in the scope.
-//   */
-//  final List<LibraryElement> libraries;
-//
-//  /**
-//   * Create a search scope that encompasses everything in the given libraries.
-//   *
-//   * @param libraries the libraries defining which elements are included in the scope
-//   */
-//  LibrarySearchScope.con1(Iterable<LibraryElement> libraries) : this.con2(new List.from(libraries));
-//
-//  /**
-//   * Create a search scope that encompasses everything in the given libraries.
-//   *
-//   * @param libraries the libraries defining which elements are included in the scope
-//   */
-//  LibrarySearchScope.con2(this.libraries);
-//
-//  @override
-//  bool encloses(Element element) {
-//    LibraryElement elementLibrary = element.getAncestor((element) => element is LibraryElement);
-//    return ArrayUtils.contains(libraries, elementLibrary);
-//  }
-//}
-//
-///**
-// * Instances of the class <code>NameMatchingSearchListener</code> implement a search listener that
-// * delegates to another search listener after removing matches that do not match a given pattern.
-// */
-//class NameMatchingSearchListener extends WrappedSearchListener {
-//  /**
-//   * The pattern used to filter the matches.
-//   */
-//  final SearchPattern _pattern;
-//
-//  /**
-//   * Initialize a newly created search listener to pass on any matches that match the given pattern
-//   * to the given listener.
-//   *
-//   * @param pattern the pattern used to filter the matches
-//   * @param listener the search listener being wrapped
-//   */
-//  NameMatchingSearchListener(this._pattern, SearchListener listener) : super(listener);
-//
-//  @override
-//  void matchFound(SearchMatch match) {
-//    if (_pattern.matches(match.element) != null) {
-//      propagateMatch(match);
-//    }
-//  }
-//}
-//
-///**
-// * Instances of the class <code>OrSearchPattern</code> implement a search pattern that matches
-// * elements that match any one of several other search patterns.
-// */
-//class OrSearchPattern implements SearchPattern {
-//  /**
-//   * The patterns used to determine whether this pattern matches an element.
-//   */
-//  final List<SearchPattern> _patterns;
-//
-//  /**
-//   * Initialize a newly created search pattern to match elements that match any one of several other
-//   * search patterns.
-//   *
-//   * @param patterns the patterns used to determine whether this pattern matches an element
-//   */
-//  OrSearchPattern(this._patterns);
-//
-//  @override
-//  MatchQuality matches(Element element) {
-//    // Do we want to return the highest quality of match rather than stopping
-//    // after the first match? Doing so would be more accurate, but slower.
-//    for (SearchPattern pattern in _patterns) {
-//      MatchQuality quality = pattern.matches(element);
-//      if (quality != null) {
-//        return quality;
-//      }
-//    }
-//    return null;
-//  }
-//}
-//
-///**
-// * Instances of the class <code>PrefixSearchPattern</code> implement a search pattern that matches
-// * elements whose name has a given prefix.
-// */
-//class PrefixSearchPattern implements SearchPattern {
-//  /**
-//   * The prefix that matching elements must start with.
-//   */
-//  final String _prefix;
-//
-//  /**
-//   * A flag indicating whether a case sensitive match is to be performed.
-//   */
-//  final bool _caseSensitive;
-//
-//  /**
-//   * Initialize a newly created search pattern to match elements whose names begin with the given
-//   * prefix.
-//   *
-//   * @param prefix the prefix that matching elements must start with
-//   * @param caseSensitive `true` if a case sensitive match is to be performed
-//   */
-//  PrefixSearchPattern(this._prefix, this._caseSensitive);
-//
-//  @override
-//  MatchQuality matches(Element element) {
-//    if (element == null) {
-//      return null;
-//    }
-//    String name = element.displayName;
-//    if (name == null) {
-//      return null;
-//    }
-//    if (_caseSensitive && startsWith(name, _prefix)) {
-//      return MatchQuality.EXACT;
-//    }
-//    if (!_caseSensitive && startsWithIgnoreCase(name, _prefix)) {
-//      return MatchQuality.EXACT;
-//    }
-//    return null;
-//  }
-//}
-//
-///**
-// * Instances of the class <code>RegularExpressionSearchPattern</code> implement a search pattern
-// * that matches elements whose name matches a given regular expression.
-// */
-//class RegularExpressionSearchPattern implements SearchPattern {
-//  /**
-//   * The regular expression pattern that matching elements must match.
-//   */
-//  RegExp _pattern;
-//
-//  /**
-//   * Initialize a newly created search pattern to match elements whose names begin with the given
-//   * prefix.
-//   *
-//   * @param regularExpression the regular expression that matching elements must match
-//   * @param caseSensitive `true` if a case sensitive match is to be performed
-//   */
-//  RegularExpressionSearchPattern(String regularExpression, bool caseSensitive) {
-//    _pattern = new RegExp(regularExpression);
-//  }
-//
-//  @override
-//  MatchQuality matches(Element element) {
-//    if (element == null) {
-//      return null;
-//    }
-//    String name = element.displayName;
-//    if (name == null) {
-//      return null;
-//    }
-//    if (new JavaPatternMatcher(_pattern, name).matches()) {
-//      return MatchQuality.EXACT;
-//    }
-//    return null;
-//  }
-//}
-//
-///**
-// * Factory for [SearchEngine].
-// */
-//class SearchEngineFactory {
-//  /**
-//   * @return the new [SearchEngine] instance based on the given [Index].
-//   */
-//  static SearchEngine createSearchEngine(Index index) => new SearchEngineImpl(index);
-//}
-
-///**
-// * Implementation of [SearchEngine].
-// */
-//class SearchEngineImpl implements SearchEngine {
-//  /**
-//   * Apply the given filter to the given listener.
-//   *
-//   * @param filter the filter to be used before passing matches on to the listener, or `null`
-//   *          if all matches should be passed on
-//   * @param listener the listener that will only be given matches that pass the filter
-//   * @return a search listener that will pass to the given listener any matches that pass the given
-//   *         filter
-//   */
-//  static SearchListener _applyFilter(SearchFilter filter, SearchListener listener) {
-//    if (filter == null) {
-//      return listener;
-//    }
-//    return new FilteredSearchListener(filter, listener);
-//  }
-//
-//  /**
-//   * Apply the given pattern to the given listener.
-//   *
-//   * @param pattern the pattern to be used before passing matches on to the listener, or
-//   *          `null` if all matches should be passed on
-//   * @param listener the listener that will only be given matches that match the pattern
-//   * @return a search listener that will pass to the given listener any matches that match the given
-//   *         pattern
-//   */
-//  static SearchListener _applyPattern(SearchPattern pattern, SearchListener listener) {
-//    if (pattern == null) {
-//      return listener;
-//    }
-//    return new NameMatchingSearchListener(pattern, listener);
-//  }
-//
-//  static List<Element> _createElements(SearchScope scope) {
-//    if (scope is LibrarySearchScope) {
-//      return scope.libraries;
-//    }
-//    return <Element> [IndexConstants.UNIVERSE];
-//  }
-//
-//  static RelationshipCallback _newCallback(MatchKind matchKind, SearchScope scope, SearchListener listener) => new SearchEngineImpl_RelationshipCallbackImpl(scope, matchKind, listener);
-//
-//  /**
-//   * The index used to respond to the search requests.
-//   */
-//  final Index _index;
-//
-//  /**
-//   * Initialize a newly created search engine to use the given index.
-//   *
-//   * @param index the index used to respond to the search requests
-//   */
-//  SearchEngineImpl(this._index);
-//
-//  @override
-//  Set<DartType> searchAssignedTypes(PropertyInducingElement variable, SearchScope scope) {
-//    PropertyAccessorElement setter = variable.setter;
-//    int numRequests = (setter != null ? 2 : 0) + 2;
-//    // find locations
-//    List<Location> locations = [];
-//    CountDownLatch latch = new CountDownLatch(numRequests);
-//    if (setter != null) {
-//      _index.getRelationships(setter, IndexConstants.IS_REFERENCED_BY_QUALIFIED, new Callback());
-//      _index.getRelationships(setter, IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, new Callback());
-//    }
-//    _index.getRelationships(variable, IndexConstants.IS_REFERENCED_BY, new Callback());
-//    _index.getRelationships(variable, IndexConstants.IS_DEFINED_BY, new Callback());
-//    Uninterruptibles.awaitUninterruptibly(latch);
-//    // get types from locations
-//    Set<DartType> types = new Set();
-//    for (Location location in locations) {
-//      // check scope
-//      if (scope != null) {
-//        Element targetElement = location.element;
-//        if (!scope.encloses(targetElement)) {
-//          continue;
-//        }
-//      }
-//      // we need data
-//      if (location is! LocationWithData) {
-//        continue;
-//      }
-//      LocationWithData locationWithData = location as LocationWithData;
-//      // add type
-//      Object data = locationWithData.data;
-//      if (data is DartType) {
-//        DartType type = data as DartType;
-//        types.add(type);
-//      }
-//    }
-//    // done
-//    return types;
-//  }
-//
-//  @override
-//  List<SearchMatch> searchDeclarations(String name, SearchScope scope, SearchFilter filter) => _gatherResults(new SearchRunner_SearchEngineImpl_searchDeclarations(this, name, scope, filter));
-//
-//  @override
-//  void searchDeclarations2(String name, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.IS_DEFINED_BY, _newCallback(MatchKind.NAME_DECLARATION, scope, listener));
-//  }
-//
-//  @override
-//  List<SearchMatch> searchFunctionDeclarations(SearchScope scope, SearchPattern pattern, SearchFilter filter) => _gatherResults(new SearchRunner_SearchEngineImpl_searchFunctionDeclarations(this, scope, pattern, filter));
-//
-//  @override
-//  void searchFunctionDeclarations2(SearchScope scope, SearchPattern pattern, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    List<Element> elements = _createElements(scope);
-//    listener = _applyPattern(pattern, listener);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(elements.length, listener);
-//    for (Element element in elements) {
-//      _index.getRelationships(element, IndexConstants.DEFINES_FUNCTION, _newCallback(MatchKind.FUNCTION_DECLARATION, scope, listener));
-//    }
-//  }
-//
-//  @override
-//  List<SearchMatch> searchQualifiedMemberReferences(String name, SearchScope scope, SearchFilter filter) => _gatherResults(new SearchRunner_SearchEngineImpl_searchQualifiedMemberReferences(this, name, scope, filter));
-//
-//  @override
-//  void searchQualifiedMemberReferences2(String name, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(10, listener);
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.IS_REFERENCED_BY_QUALIFIED_RESOLVED, _newCallback(MatchKind.NAME_REFERENCE_RESOLVED, scope, listener));
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.IS_REFERENCED_BY_QUALIFIED_UNRESOLVED, _newCallback(MatchKind.NAME_REFERENCE_UNRESOLVED, scope, listener));
-//    // granular resolved operations
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.NAME_IS_INVOKED_BY_RESOLVED, _newCallback(MatchKind.NAME_INVOCATION_RESOLVED, scope, listener));
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.NAME_IS_READ_BY_RESOLVED, _newCallback(MatchKind.NAME_READ_RESOLVED, scope, listener));
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.NAME_IS_READ_WRITTEN_BY_RESOLVED, _newCallback(MatchKind.NAME_READ_WRITE_RESOLVED, scope, listener));
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.NAME_IS_WRITTEN_BY_RESOLVED, _newCallback(MatchKind.NAME_WRITE_RESOLVED, scope, listener));
-//    // granular unresolved operations
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.NAME_IS_INVOKED_BY_UNRESOLVED, _newCallback(MatchKind.NAME_INVOCATION_UNRESOLVED, scope, listener));
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.NAME_IS_READ_BY_UNRESOLVED, _newCallback(MatchKind.NAME_READ_UNRESOLVED, scope, listener));
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.NAME_IS_READ_WRITTEN_BY_UNRESOLVED, _newCallback(MatchKind.NAME_READ_WRITE_UNRESOLVED, scope, listener));
-//    _index.getRelationships(new NameElementImpl(name), IndexConstants.NAME_IS_WRITTEN_BY_UNRESOLVED, _newCallback(MatchKind.NAME_WRITE_UNRESOLVED, scope, listener));
-//  }
-//
-//  @override
-//  List<SearchMatch> searchReferences(Element element, SearchScope scope, SearchFilter filter) => _gatherResults(new SearchRunner_SearchEngineImpl_searchReferences(this, element, scope, filter));
-//
-//  @override
-//  void searchReferences2(Element element, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    if (element == null) {
-//      listener.searchComplete();
-//      return;
-//    }
-//    if (element is Member) {
-//      element = (element as Member).baseElement;
-//    }
-//    while (true) {
-//      if (element.kind == ElementKind.ANGULAR_COMPONENT || element.kind == ElementKind.ANGULAR_CONTROLLER || element.kind == ElementKind.ANGULAR_FORMATTER || element.kind == ElementKind.ANGULAR_PROPERTY || element.kind == ElementKind.ANGULAR_SCOPE_PROPERTY || element.kind == ElementKind.ANGULAR_SELECTOR) {
-//        _searchReferences(element as AngularElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.CLASS) {
-//        _searchReferences2(element as ClassElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.COMPILATION_UNIT) {
-//        _searchReferences3(element as CompilationUnitElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.CONSTRUCTOR) {
-//        _searchReferences4(element as ConstructorElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.FIELD || element.kind == ElementKind.TOP_LEVEL_VARIABLE) {
-//        _searchReferences12(element as PropertyInducingElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.FUNCTION) {
-//        _searchReferences5(element as FunctionElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.GETTER || element.kind == ElementKind.SETTER) {
-//        _searchReferences11(element as PropertyAccessorElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.IMPORT) {
-//        _searchReferences7(element as ImportElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.LIBRARY) {
-//        _searchReferences8(element as LibraryElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.LOCAL_VARIABLE) {
-//        _searchReferences14(element as LocalVariableElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.METHOD) {
-//        _searchReferences9(element as MethodElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.PARAMETER) {
-//        _searchReferences10(element as ParameterElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.FUNCTION_TYPE_ALIAS) {
-//        _searchReferences6(element as FunctionTypeAliasElement, scope, filter, listener);
-//        return;
-//      } else if (element.kind == ElementKind.TYPE_PARAMETER) {
-//        _searchReferences13(element as TypeParameterElement, scope, filter, listener);
-//        return;
-//      } else {
-//        listener.searchComplete();
-//        return;
-//      }
-//      break;
-//    }
-//  }
-//
-//  @override
-//  List<SearchMatch> searchSubtypes(ClassElement type, SearchScope scope, SearchFilter filter) => _gatherResults(new SearchRunner_SearchEngineImpl_searchSubtypes(this, type, scope, filter));
-//
-//  @override
-//  void searchSubtypes2(ClassElement type, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(3, listener);
-//    _index.getRelationships(type, IndexConstants.IS_EXTENDED_BY, _newCallback(MatchKind.EXTENDS_REFERENCE, scope, listener));
-//    _index.getRelationships(type, IndexConstants.IS_MIXED_IN_BY, _newCallback(MatchKind.WITH_REFERENCE, scope, listener));
-//    _index.getRelationships(type, IndexConstants.IS_IMPLEMENTED_BY, _newCallback(MatchKind.IMPLEMENTS_REFERENCE, scope, listener));
-//  }
-//
-//  @override
-//  List<SearchMatch> searchTypeDeclarations(SearchScope scope, SearchPattern pattern, SearchFilter filter) => _gatherResults(new SearchRunner_SearchEngineImpl_searchTypeDeclarations(this, scope, pattern, filter));
-//
-//  @override
-//  void searchTypeDeclarations2(SearchScope scope, SearchPattern pattern, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    List<Element> elements = _createElements(scope);
-//    listener = _applyPattern(pattern, listener);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(elements.length * 3, listener);
-//    for (Element element in elements) {
-//      _index.getRelationships(element, IndexConstants.DEFINES_CLASS, _newCallback(MatchKind.CLASS_DECLARATION, scope, listener));
-//      _index.getRelationships(element, IndexConstants.DEFINES_CLASS_ALIAS, _newCallback(MatchKind.CLASS_ALIAS_DECLARATION, scope, listener));
-//      _index.getRelationships(element, IndexConstants.DEFINES_FUNCTION_TYPE, _newCallback(MatchKind.FUNCTION_TYPE_DECLARATION, scope, listener));
-//    }
-//  }
-//
-//  @override
-//  List<SearchMatch> searchVariableDeclarations(SearchScope scope, SearchPattern pattern, SearchFilter filter) => _gatherResults(new SearchRunner_SearchEngineImpl_searchVariableDeclarations(this, scope, pattern, filter));
-//
-//  @override
-//  void searchVariableDeclarations2(SearchScope scope, SearchPattern pattern, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    List<Element> elements = _createElements(scope);
-//    listener = _applyPattern(pattern, listener);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(elements.length, listener);
-//    for (Element element in elements) {
-//      _index.getRelationships(element, IndexConstants.DEFINES_VARIABLE, _newCallback(MatchKind.VARIABLE_DECLARATION, scope, listener));
-//    }
-//  }
-//
-//  /**
-//   * Use the given runner to perform the given number of asynchronous searches, then wait until the
-//   * search has completed and return the results that were produced.
-//   *
-//   * @param runner the runner used to perform an asynchronous search
-//   * @return the results that were produced @ if the results of at least one of the searched could
-//   *         not be computed
-//   */
-//  List<SearchMatch> _gatherResults(SearchEngineImpl_SearchRunner runner) {
-//    GatheringSearchListener listener = new GatheringSearchListener();
-//    runner.performSearch(listener);
-//    while (!listener.isComplete) {
-//      Thread.yield();
-//    }
-//    return listener.matches;
-//  }
-//
-//  void _searchReferences(AngularElement element, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(2, listener);
-//    _index.getRelationships(element, IndexConstants.ANGULAR_REFERENCE, _newCallback(MatchKind.ANGULAR_REFERENCE, scope, listener));
-//    _index.getRelationships(element, IndexConstants.ANGULAR_CLOSING_TAG_REFERENCE, _newCallback(MatchKind.ANGULAR_CLOSING_TAG_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences2(ClassElement type, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    _index.getRelationships(type, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.TYPE_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences3(CompilationUnitElement unit, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    _index.getRelationships(unit, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.UNIT_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences4(ConstructorElement constructor, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(2, listener);
-//    _index.getRelationships(constructor, IndexConstants.IS_DEFINED_BY, _newCallback(MatchKind.CONSTRUCTOR_DECLARATION, scope, listener));
-//    _index.getRelationships(constructor, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.CONSTRUCTOR_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences5(FunctionElement function, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(2, listener);
-//    _index.getRelationships(function, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.FUNCTION_REFERENCE, scope, listener));
-//    _index.getRelationships(function, IndexConstants.IS_INVOKED_BY, _newCallback(MatchKind.FUNCTION_EXECUTION, scope, listener));
-//  }
-//
-//  void _searchReferences6(FunctionTypeAliasElement alias, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    _index.getRelationships(alias, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.FUNCTION_TYPE_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences7(ImportElement imp, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    _index.getRelationships(imp, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.IMPORT_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences8(LibraryElement library, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    _index.getRelationships(library, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.LIBRARY_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences9(MethodElement method, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    // TODO(scheglov) use "5" when add named matches
-//    listener = new CountingSearchListener(4, listener);
-//    // exact matches
-//    _index.getRelationships(method, IndexConstants.IS_INVOKED_BY_UNQUALIFIED, _newCallback(MatchKind.METHOD_INVOCATION, scope, listener));
-//    _index.getRelationships(method, IndexConstants.IS_INVOKED_BY_QUALIFIED, _newCallback(MatchKind.METHOD_INVOCATION, scope, listener));
-//    _index.getRelationships(method, IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, _newCallback(MatchKind.METHOD_REFERENCE, scope, listener));
-//    _index.getRelationships(method, IndexConstants.IS_REFERENCED_BY_QUALIFIED, _newCallback(MatchKind.METHOD_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences10(ParameterElement parameter, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(5, listener);
-//    _index.getRelationships(parameter, IndexConstants.IS_READ_BY, _newCallback(MatchKind.VARIABLE_READ, scope, listener));
-//    _index.getRelationships(parameter, IndexConstants.IS_READ_WRITTEN_BY, _newCallback(MatchKind.VARIABLE_READ_WRITE, scope, listener));
-//    _index.getRelationships(parameter, IndexConstants.IS_WRITTEN_BY, _newCallback(MatchKind.VARIABLE_WRITE, scope, listener));
-//    _index.getRelationships(parameter, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.NAMED_PARAMETER_REFERENCE, scope, listener));
-//    _index.getRelationships(parameter, IndexConstants.IS_INVOKED_BY, _newCallback(MatchKind.FUNCTION_EXECUTION, scope, listener));
-//  }
-//
-//  void _searchReferences11(PropertyAccessorElement accessor, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(2, listener);
-//    _index.getRelationships(accessor, IndexConstants.IS_REFERENCED_BY_QUALIFIED, _newCallback(MatchKind.PROPERTY_ACCESSOR_REFERENCE, scope, listener));
-//    _index.getRelationships(accessor, IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, _newCallback(MatchKind.PROPERTY_ACCESSOR_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences12(PropertyInducingElement field, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    PropertyAccessorElement getter = field.getter;
-//    PropertyAccessorElement setter = field.setter;
-//    int numRequests = (getter != null ? 4 : 0) + (setter != null ? 2 : 0) + 2;
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(numRequests, listener);
-//    if (getter != null) {
-//      _index.getRelationships(getter, IndexConstants.IS_REFERENCED_BY_QUALIFIED, _newCallback(MatchKind.FIELD_READ, scope, listener));
-//      _index.getRelationships(getter, IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, _newCallback(MatchKind.FIELD_READ, scope, listener));
-//      _index.getRelationships(getter, IndexConstants.IS_INVOKED_BY_QUALIFIED, _newCallback(MatchKind.FIELD_INVOCATION, scope, listener));
-//      _index.getRelationships(getter, IndexConstants.IS_INVOKED_BY_UNQUALIFIED, _newCallback(MatchKind.FIELD_INVOCATION, scope, listener));
-//    }
-//    if (setter != null) {
-//      _index.getRelationships(setter, IndexConstants.IS_REFERENCED_BY_QUALIFIED, _newCallback(MatchKind.FIELD_WRITE, scope, listener));
-//      _index.getRelationships(setter, IndexConstants.IS_REFERENCED_BY_UNQUALIFIED, _newCallback(MatchKind.FIELD_WRITE, scope, listener));
-//    }
-//    _index.getRelationships(field, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.FIELD_REFERENCE, scope, listener));
-//    _index.getRelationships(field, IndexConstants.IS_REFERENCED_BY_QUALIFIED, _newCallback(MatchKind.FIELD_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences13(TypeParameterElement typeParameter, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    _index.getRelationships(typeParameter, IndexConstants.IS_REFERENCED_BY, _newCallback(MatchKind.TYPE_PARAMETER_REFERENCE, scope, listener));
-//  }
-//
-//  void _searchReferences14(VariableElement variable, SearchScope scope, SearchFilter filter, SearchListener listener) {
-//    assert(listener != null);
-//    listener = _applyFilter(filter, listener);
-//    listener = new CountingSearchListener(4, listener);
-//    _index.getRelationships(variable, IndexConstants.IS_READ_BY, _newCallback(MatchKind.VARIABLE_READ, scope, listener));
-//    _index.getRelationships(variable, IndexConstants.IS_READ_WRITTEN_BY, _newCallback(MatchKind.VARIABLE_READ_WRITE, scope, listener));
-//    _index.getRelationships(variable, IndexConstants.IS_WRITTEN_BY, _newCallback(MatchKind.VARIABLE_WRITE, scope, listener));
-//    _index.getRelationships(variable, IndexConstants.IS_INVOKED_BY, _newCallback(MatchKind.FUNCTION_EXECUTION, scope, listener));
-//  }
-//}
-//
-///**
-// * Instances of the class <code>RelationshipCallbackImpl</code> implement a callback that can be
-// * used to report results to a search listener.
-// */
-//class SearchEngineImpl_RelationshipCallbackImpl implements RelationshipCallback {
-//  final SearchScope _scope;
-//
-//  /**
-//   * The kind of matches that are represented by the results that will be provided to this
-//   * callback.
-//   */
-//  final MatchKind _matchKind;
-//
-//  /**
-//   * The search listener that should be notified when results are found.
-//   */
-//  final SearchListener _listener;
-//
-//  /**
-//   * Initialize a newly created callback to report matches of the given kind to the given listener
-//   * when results are found.
-//   *
-//   * @param scope the [SearchScope] to return matches from, may be `null` to return
-//   *          all matches
-//   * @param matchKind the kind of matches that are represented by the results
-//   * @param listener the search listener that should be notified when results are found
-//   */
-//  SearchEngineImpl_RelationshipCallbackImpl(this._scope, this._matchKind, this._listener);
-//
-//  @override
-//  void hasRelationships(Element element, Relationship relationship, List<Location> locations) {
-//    for (Location location in locations) {
-//      Element targetElement = location.element;
-//      // check scope
-//      if (_scope != null && !_scope.encloses(targetElement)) {
-//        continue;
-//      }
-//      SourceRange range = new SourceRange(location.offset, location.length);
-//      // TODO(scheglov) IndexConstants.DYNAMIC for MatchQuality.NAME
-//      MatchQuality quality = MatchQuality.EXACT;
-//      //          MatchQuality quality = element.getResource() != IndexConstants.DYNAMIC
-//      //              ? MatchQuality.EXACT : MatchQuality.NAME;
-//      SearchMatch match = new SearchMatch(quality, _matchKind, targetElement, range);
-//      match.qualified = identical(relationship, IndexConstants.IS_REFERENCED_BY_QUALIFIED) || identical(relationship, IndexConstants.IS_INVOKED_BY_QUALIFIED);
-//      _listener.matchFound(match);
-//    }
-//    _listener.searchComplete();
-//  }
-//}
-//
-///**
-// * The interface <code>SearchRunner</code> defines the behavior of objects that can be used to
-// * perform an asynchronous search.
-// */
-//abstract class SearchEngineImpl_SearchRunner {
-//  /**
-//   * Perform an asynchronous search, passing the results to the given listener.
-//   *
-//   * @param listener the listener to which search results should be passed @ if the results could
-//   *          not be computed
-//   */
-//  void performSearch(SearchListener listener);
-//}
-//
-///**
-// * The interface <code>SearchListener</code> defines the behavior of objects that are listening for
-// * the results of a search.
-// */
-//abstract class SearchListener {
-//  /**
-//   * Record the fact that the given match was found.
-//   *
-//   * @param match the match that was found
-//   */
-//  void matchFound(SearchMatch match);
-//
-//  /**
-//   * This method is invoked when the search is complete and no additional matches will be found.
-//   */
-//  void searchComplete();
-//}
-
-///**
-// * The class <code>SearchPatternFactory</code> defines utility methods that can be used to create
-// * search patterns.
-// */
-//class SearchPatternFactory {
-//  /**
-//   * Create a pattern that will match any element that is matched by all of the given patterns. If
-//   * no patterns are given, then the resulting pattern will not match any elements.
-//   *
-//   * @param patterns the patterns that must all be matched in order for the new pattern to be
-//   *          matched
-//   * @return the pattern that was created
-//   */
-//  static SearchPattern createAndPattern(List<SearchPattern> patterns) {
-//    if (patterns.length == 1) {
-//      return patterns[0];
-//    }
-//    return new AndSearchPattern(patterns);
-//  }
-//
-//  /**
-//   * Create a pattern that will match any element whose name matches a partial identifier where
-//   * camel case conventions are used to perform what is essentially multiple prefix matches.
-//   *
-//   * @param pattern the pattern that matching elements must match
-//   * @param samePartCount `true` if the pattern and the name being matched must have
-//   *          exactly the same number of parts (i.e. the same number of uppercase characters)
-//   * @return the pattern that was created
-//   */
-//  static SearchPattern createCamelCasePattern(String prefix, bool samePartCount) => new CamelCaseSearchPattern(prefix, samePartCount);
-//
-//  /**
-//   * Create a pattern that will match any element whose name matches a specified identifier exactly.
-//   *
-//   * @param identifier the identifier that matching elements must be equal to
-//   * @param caseSensitive `true` if a case sensitive match is to be performed
-//   * @return the pattern that was created
-//   */
-//  static SearchPattern createExactPattern(String identifier, bool caseSensitive) => new ExactSearchPattern(identifier, caseSensitive);
-//
-//  /**
-//   * Create a pattern that will match any element that is matched by at least one of the given
-//   * patterns. If no patterns are given, then the resulting pattern will not match any elements.
-//   *
-//   * @param patterns the patterns used to determine whether the new pattern is matched
-//   * @return the pattern that was created
-//   */
-//  static SearchPattern createOrPattern(List<SearchPattern> patterns) {
-//    if (patterns.length == 1) {
-//      return patterns[0];
-//    }
-//    return new OrSearchPattern(patterns);
-//  }
-//
-//  /**
-//   * Create a pattern that will match any element whose name starts with the given prefix.
-//   *
-//   * @param prefix the prefix of names that match the pattern
-//   * @param caseSensitive `true` if a case sensitive match is to be performed
-//   * @return the pattern that was created
-//   */
-//  static SearchPattern createPrefixPattern(String prefix, bool caseSensitive) => new PrefixSearchPattern(prefix, caseSensitive);
-//
-//  /**
-//   * Create a pattern that will match any element whose name matches a regular expression.
-//   *
-//   * @param regularExpression the regular expression that matching elements must match
-//   * @param caseSensitive `true` if a case sensitive match is to be performed
-//   * @return the pattern that was created
-//   */
-//  static SearchPattern createRegularExpressionPattern(String regularExpression, bool caseSensitive) => new RegularExpressionSearchPattern(regularExpression, caseSensitive);
-//
-//  /**
-//   * Create a pattern that will match any element whose name matches a pattern containing wildcard
-//   * characters. The wildcard characters that are currently supported are '?' (to match any single
-//   * character) and '*' (to match zero or more characters).
-//   *
-//   * @param pattern the pattern that matching elements must match
-//   * @param caseSensitive `true` if a case sensitive match is to be performed
-//   * @return the pattern that was created
-//   */
-//  static SearchPattern createWildcardPattern(String pattern, bool caseSensitive) => new WildcardSearchPattern(pattern, caseSensitive);
-//}
-//
-//class SearchRunner_SearchEngineImpl_searchDeclarations implements SearchEngineImpl_SearchRunner {
-//  final SearchEngineImpl SearchEngineImpl_this;
-//
-//  String name;
-//
-//  SearchScope scope;
-//
-//  SearchFilter filter;
-//
-//  SearchRunner_SearchEngineImpl_searchDeclarations(this.SearchEngineImpl_this, this.name, this.scope, this.filter);
-//
-//  @override
-//  void performSearch(SearchListener listener) {
-//    SearchEngineImpl_this.searchDeclarations2(name, scope, filter, listener);
-//  }
-//}
-//
-//class SearchRunner_SearchEngineImpl_searchFunctionDeclarations implements SearchEngineImpl_SearchRunner {
-//  final SearchEngineImpl SearchEngineImpl_this;
-//
-//  SearchScope scope;
-//
-//  SearchPattern pattern;
-//
-//  SearchFilter filter;
-//
-//  SearchRunner_SearchEngineImpl_searchFunctionDeclarations(this.SearchEngineImpl_this, this.scope, this.pattern, this.filter);
-//
-//  @override
-//  void performSearch(SearchListener listener) {
-//    SearchEngineImpl_this.searchFunctionDeclarations2(scope, pattern, filter, listener);
-//  }
-//}
-//
-//class SearchRunner_SearchEngineImpl_searchQualifiedMemberReferences implements SearchEngineImpl_SearchRunner {
-//  final SearchEngineImpl SearchEngineImpl_this;
-//
-//  String name;
-//
-//  SearchScope scope;
-//
-//  SearchFilter filter;
-//
-//  SearchRunner_SearchEngineImpl_searchQualifiedMemberReferences(this.SearchEngineImpl_this, this.name, this.scope, this.filter);
-//
-//  @override
-//  void performSearch(SearchListener listener) {
-//    SearchEngineImpl_this.searchQualifiedMemberReferences2(name, scope, filter, listener);
-//  }
-//}
-//
-//class SearchRunner_SearchEngineImpl_searchReferences implements SearchEngineImpl_SearchRunner {
-//  final SearchEngineImpl SearchEngineImpl_this;
-//
-//  Element element;
-//
-//  SearchScope scope;
-//
-//  SearchFilter filter;
-//
-//  SearchRunner_SearchEngineImpl_searchReferences(this.SearchEngineImpl_this, this.element, this.scope, this.filter);
-//
-//  @override
-//  void performSearch(SearchListener listener) {
-//    SearchEngineImpl_this.searchReferences2(element, scope, filter, listener);
-//  }
-//}
-//
-//class SearchRunner_SearchEngineImpl_searchSubtypes implements SearchEngineImpl_SearchRunner {
-//  final SearchEngineImpl SearchEngineImpl_this;
-//
-//  ClassElement type;
-//
-//  SearchScope scope;
-//
-//  SearchFilter filter;
-//
-//  SearchRunner_SearchEngineImpl_searchSubtypes(this.SearchEngineImpl_this, this.type, this.scope, this.filter);
-//
-//  @override
-//  void performSearch(SearchListener listener) {
-//    SearchEngineImpl_this.searchSubtypes2(type, scope, filter, listener);
-//  }
-//}
-//
-//class SearchRunner_SearchEngineImpl_searchTypeDeclarations implements SearchEngineImpl_SearchRunner {
-//  final SearchEngineImpl SearchEngineImpl_this;
-//
-//  SearchScope scope;
-//
-//  SearchPattern pattern;
-//
-//  SearchFilter filter;
-//
-//  SearchRunner_SearchEngineImpl_searchTypeDeclarations(this.SearchEngineImpl_this, this.scope, this.pattern, this.filter);
-//
-//  @override
-//  void performSearch(SearchListener listener) {
-//    SearchEngineImpl_this.searchTypeDeclarations2(scope, pattern, filter, listener);
-//  }
-//}
-//
-//class SearchRunner_SearchEngineImpl_searchVariableDeclarations implements SearchEngineImpl_SearchRunner {
-//  final SearchEngineImpl SearchEngineImpl_this;
-//
-//  SearchScope scope;
-//
-//  SearchPattern pattern;
-//
-//  SearchFilter filter;
-//
-//  SearchRunner_SearchEngineImpl_searchVariableDeclarations(this.SearchEngineImpl_this, this.scope, this.pattern, this.filter);
-//
-//  @override
-//  void performSearch(SearchListener listener) {
-//    SearchEngineImpl_this.searchVariableDeclarations2(scope, pattern, filter, listener);
-//  }
-//}
-//
-///**
-// * The class <code>SearchScopeFactory</code> defines utility methods that can be used to create
-// * search scopes.
-// */
-//class SearchScopeFactory {
-//  /**
-//   * A search scope that encompasses everything in the "universe". Because it does not hold any
-//   * state there is no reason not to share a single instance.
-//   */
-//  static SearchScope _UNIVERSE_SCOPE = new UniverseSearchScope();
-//
-//  /**
-//   * Create a search scope that encompasses everything in the given library.
-//   *
-//   * @param library the library defining which elements are included in the scope
-//   * @return the search scope that was created
-//   */
-//  static SearchScope createLibraryScope(Iterable<LibraryElement> libraries) => new LibrarySearchScope.con1(libraries);
-//
-//  /**
-//   * Create a search scope that encompasses everything in the given libraries.
-//   *
-//   * @param libraries the libraries defining which elements are included in the scope
-//   * @return the search scope that was created
-//   */
-//  static SearchScope createLibraryScope2(List<LibraryElement> libraries) => new LibrarySearchScope.con2(libraries);
-//
-//  /**
-//   * Create a search scope that encompasses everything in the given library.
-//   *
-//   * @param library the library defining which elements are included in the scope
-//   * @return the search scope that was created
-//   */
-//  static SearchScope createLibraryScope3(LibraryElement library) => new LibrarySearchScope.con2([library]);
-//
-//  /**
-//   * Create a search scope that encompasses everything in the universe.
-//   *
-//   * @return the search scope that was created
-//   */
-//  static SearchScope createUniverseScope() => _UNIVERSE_SCOPE;
-//}
-//
-///**
-// * The [SearchScope] that encompasses everything in the universe.
-// */
-//class UniverseSearchScope implements SearchScope {
-//  @override
-//  bool encloses(Element element) => true;
-//}
-//
-///**
-// * Instances of the class <code>WildcardSearchPattern</code> implement a search pattern that matches
-// * elements whose name matches a pattern with wildcard characters. The wildcard characters that are
-// * currently supported are '?' (to match any single character) and '*' (to match zero or more
-// * characters).
-// */
-//class WildcardSearchPattern implements SearchPattern {
-//  /**
-//   * The pattern that matching elements must match.
-//   */
-//  List<int> _pattern;
-//
-//  /**
-//   * A flag indicating whether a case sensitive match is to be performed.
-//   */
-//  final bool _caseSensitive;
-//
-//  /**
-//   * Initialize a newly created search pattern to match elements whose names begin with the given
-//   * prefix.
-//   *
-//   * @param pattern the pattern that matching elements must match
-//   * @param caseSensitive `true` if a case sensitive match is to be performed
-//   */
-//  WildcardSearchPattern(String pattern, this._caseSensitive) {
-//    this._pattern = _caseSensitive ? pattern.toCharArray() : pattern.toLowerCase().toCharArray();
-//  }
-//
-//  @override
-//  MatchQuality matches(Element element) {
-//    if (element == null) {
-//      return null;
-//    }
-//    String name = element.displayName;
-//    if (name == null) {
-//      return null;
-//    }
-//    if (CharOperation.match(_pattern, name.toCharArray(), _caseSensitive)) {
-//      return MatchQuality.EXACT;
-//    }
-//    return null;
-//  }
-//}
-//
-///**
-// * Instances of the class <code>ScopedSearchListener</code> implement a search listener that
-// * delegates to another search listener after removing matches that are outside a given scope.
-// */
-//abstract class WrappedSearchListener implements SearchListener {
-//  /**
-//   * The listener being wrapped.
-//   */
-//  SearchListener _baseListener;
-//
-//  /**
-//   * Initialize a newly created search listener to wrap the given listener.
-//   *
-//   * @param listener the search listener being wrapped
-//   */
-//  WrappedSearchListener(SearchListener listener) {
-//    _baseListener = listener;
-//  }
-//
-//  @override
-//  void searchComplete() {
-//    _baseListener.searchComplete();
-//  }
-//
-//  /**
-//   * Pass the given match on to the wrapped listener.
-//   *
-//   * @param match the match to be propagated
-//   */
-//  void propagateMatch(SearchMatch match) {
-//    _baseListener.matchFound(match);
-//  }
-//}