remove old completion API

pkg/analysis_server/lib/src/services/completion/completion_manager.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.completion.manager;
-
-import 'dart:async';
-
-import 'package:analysis_server/plugin/protocol/protocol.dart';
-import 'package:analysis_server/src/provisional/completion/completion_core.dart'
-    show
-        CompletionContributor,
-        CompletionContributorFactory,
-        CompletionRequest,
-        CompletionResult;
-import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
-import 'package:analysis_server/src/services/search/search_engine.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/source.dart';
-
-/**
- * Manages completion contributors for a given completion request.
- */
-abstract class CompletionManager {
-  /**
-   * The context in which the completion was computed.
-   */
-  final AnalysisContext context;
-
-  /**
-   * The source in which the completion was computed.
-   */
-  final Source source;
-
-  CompletionManager(this.context, this.source);
-
-  /**
-   * Create a manager for the given request.
-   */
-  factory CompletionManager.create(
-      AnalysisContext context,
-      Source source,
-      SearchEngine searchEngine,
-      Iterable<CompletionContributor> newContributors) {
-    if (context != null) {
-      if (AnalysisEngine.isDartFileName(source.shortName)) {
-        return new DartCompletionManager.create(
-            context, searchEngine, source, newContributors);
-      }
-    }
-    return new NoOpCompletionManager(source);
-  }
-
-  /**
-   * Compute and cache information in preparation for a possible code
-   * completion request sometime in the future. The default implementation
-   * of this method does nothing. Subclasses may override but should not
-   * count on this method being called before [computeSuggestions].
-   * Return a future that completes when the cache is computed with a bool
-   * indicating success.
-   */
-  Future<bool> computeCache() {
-    return new Future.value(true);
-  }
-
-  /**
-   * Compute completion results for the given reqeust and append them to the stream.
-   * Clients should not call this method directly as it is automatically called
-   * when a client listens to the stream returned by [results].
-   * Subclasses should override this method, append at least one result
-   * to the [controller], and close the controller stream once complete.
-   */
-  Future<CompletionResult> computeSuggestions(CompletionRequest request);
-
-  /**
-   * Discard any pending operations.
-   * Subclasses may override but should call super.dispose
-   */
-  void dispose() {}
-}
-
-/**
- * Overall performance of a code completion operation.
- */
-class CompletionPerformance {
-  final DateTime start = new DateTime.now();
-  final Map<String, Duration> _startTimes = new Map<String, Duration>();
-  final Stopwatch _stopwatch = new Stopwatch();
-  final List<OperationPerformance> operations = <OperationPerformance>[];
-
-  Source source;
-  String snippet = '';
-  int notificationCount = -1;
-  int suggestionCountFirst = -1;
-  int suggestionCountLast = -1;
-  Duration _firstNotification;
-
-  CompletionPerformance() {
-    _stopwatch.start();
-  }
-
-  int get elapsedInMilliseconds =>
-      operations.length > 0 ? operations.last.elapsed.inMilliseconds : 0;
-
-  int get firstNotificationInMilliseconds =>
-      _firstNotification != null ? _firstNotification.inMilliseconds : 0;
-
-  String get startTimeAndMs => '${start.millisecondsSinceEpoch} - $start';
-
-  String get suggestionCount {
-    if (notificationCount < 1) return '';
-    if (notificationCount == 1) return '$suggestionCountFirst';
-    return '$suggestionCountFirst,  $suggestionCountLast';
-  }
-
-  void complete([String tag = null]) {
-    _stopwatch.stop();
-    _logDuration(tag != null ? tag : 'total time', _stopwatch.elapsed);
-  }
-
-  logElapseTime(String tag, [f() = null]) {
-    Duration start;
-    Duration end = _stopwatch.elapsed;
-    var result;
-    if (f == null) {
-      start = _startTimes[tag];
-      if (start == null) {
-        _logDuration(tag, null);
-        return null;
-      }
-    } else {
-      result = f();
-      start = end;
-      end = _stopwatch.elapsed;
-    }
-    _logDuration(tag, end - start);
-    return result;
-  }
-
-  void logFirstNotificationComplete(String tag) {
-    _firstNotification = _stopwatch.elapsed;
-    _logDuration(tag, _firstNotification);
-  }
-
-  void logStartTime(String tag) {
-    _startTimes[tag] = _stopwatch.elapsed;
-  }
-
-  void setContentsAndOffset(String contents, int offset) {
-    snippet = _computeSnippet(contents, offset);
-  }
-
-  void _logDuration(String tag, Duration elapsed) {
-    operations.add(new OperationPerformance(tag, elapsed));
-  }
-
-  static String _computeSnippet(String contents, int offset) {
-    if (contents == null ||
-        offset == null ||
-        offset < 0 ||
-        contents.length < offset) {
-      return '???';
-    }
-    int start = offset;
-    while (start > 0) {
-      String ch = contents[start - 1];
-      if (ch == '\r' || ch == '\n') {
-        break;
-      }
-      --start;
-    }
-    int end = offset;
-    while (end < contents.length) {
-      String ch = contents[end];
-      if (ch == '\r' || ch == '\n') {
-        break;
-      }
-      ++end;
-    }
-    String prefix = contents.substring(start, offset);
-    String suffix = contents.substring(offset, end);
-    return '$prefix^$suffix';
-  }
-}
-
-/**
- * Code completion result generated by an [CompletionManager].
- */
-class CompletionResultImpl implements CompletionResult {
-  /**
-   * The length of the text to be replaced if the remainder of the identifier
-   * containing the cursor is to be replaced when the suggestion is applied
-   * (that is, the number of characters in the existing identifier).
-   */
-  final int replacementLength;
-
-  /**
-   * The offset of the start of the text to be replaced. This will be different
-   * than the offset used to request the completion suggestions if there was a
-   * portion of an identifier before the original offset. In particular, the
-   * replacementOffset will be the offset of the beginning of said identifier.
-   */
-  final int replacementOffset;
-
-  /**
-   * The suggested completions.
-   */
-  final List<CompletionSuggestion> suggestions;
-
-  CompletionResultImpl(
-      this.replacementOffset, this.replacementLength, this.suggestions);
-}
-
-class NoOpCompletionManager extends CompletionManager {
-  NoOpCompletionManager(Source source) : super(null, source);
-
-  @override
-  Future<CompletionResult> computeSuggestions(CompletionRequest request) async {
-    return new CompletionResultImpl(request.offset, 0, []);
-  }
-}
-
-/**
- * The performance of an operation when computing code completion.
- */
-class OperationPerformance {
-  /**
-   * The name of the operation
-   */
-  final String name;
-
-  /**
-   * The elapse time or `null` if undefined.
-   */
-  final Duration elapsed;
-
-  OperationPerformance(this.name, this.elapsed);
-}