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[analysis_server] Always include exact matches in completion when truncating
Change-Id: I21b56392961217482dbcf5c67b9594709b27bcc0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/243721 Commit-Queue: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
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@ -32,6 +32,7 @@ import 'package:analyzer/src/util/performance/operation_performance.dart';
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import 'package:analyzer_plugin/protocol/protocol_common.dart';
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import 'package:analyzer_plugin/protocol/protocol_generated.dart' as plugin;
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import 'package:analyzer_plugin/src/utilities/completion/completion_target.dart';
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import 'package:collection/collection.dart';
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class CompletionHandler extends MessageHandler<CompletionParams, CompletionList>
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with LspPluginRequestHandlerMixin {
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@ -157,8 +158,7 @@ class CompletionHandler extends MessageHandler<CompletionParams, CompletionList>
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}
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}
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serverResultsFuture ??=
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Future.value(success(_CompletionResults(isIncomplete: false)));
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serverResultsFuture ??= Future.value(success(_CompletionResults.empty()));
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final pluginResultsFuture = _getPluginResults(
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clientCapabilities, lineInfo.result, path.result, offset);
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@ -174,12 +174,15 @@ class CompletionHandler extends MessageHandler<CompletionParams, CompletionList>
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.toList();
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final unrankedItems = serverResults.result.unrankedItems;
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// Truncate ranked items to allow room for all unranked items.
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// Truncate ranked items allowing for all unranked items.
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final maxRankedItems = math.max(maxResults - unrankedItems.length, 0);
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final truncatedRankedItems = untruncatedRankedItems.length > maxRankedItems
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? (untruncatedRankedItems..sort(sortTextComparer))
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.sublist(0, maxRankedItems)
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: untruncatedRankedItems;
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final truncatedRankedItems = untruncatedRankedItems.length <= maxRankedItems
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? untruncatedRankedItems
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: _truncateResults(
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untruncatedRankedItems,
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serverResults.result.targetPrefix,
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maxRankedItems,
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);
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final truncatedItems =
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truncatedRankedItems.followedBy(unrankedItems).toList();
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@ -308,11 +311,12 @@ class CompletionHandler extends MessageHandler<CompletionParams, CompletionList>
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completionPreference: CompletionPreference.replace,
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);
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final target = completionRequest.target;
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final fuzzy = _FuzzyFilterHelper(completionRequest.targetPrefix);
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final targetPrefix = completionRequest.targetPrefix;
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final fuzzy = _FuzzyFilterHelper(targetPrefix);
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if (triggerCharacter != null) {
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if (!_triggerCharacterValid(offset, triggerCharacter, target)) {
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return success(_CompletionResults(isIncomplete: false));
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return success(_CompletionResults.empty());
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}
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}
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@ -556,12 +560,13 @@ class CompletionHandler extends MessageHandler<CompletionParams, CompletionList>
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return success(_CompletionResults(
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isIncomplete: false,
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targetPrefix: targetPrefix,
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rankedItems: rankedResults,
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unrankedItems: unrankedResults));
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} on AbortCompletion {
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return success(_CompletionResults(isIncomplete: false));
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return success(_CompletionResults.empty());
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} on InconsistentAnalysisException {
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return success(_CompletionResults(isIncomplete: false));
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return success(_CompletionResults.empty());
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}
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}
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@ -614,8 +619,9 @@ class CompletionHandler extends MessageHandler<CompletionParams, CompletionList>
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),
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)
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.toList();
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return success(_CompletionResults(
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isIncomplete: false, unrankedItems: completionItems));
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return success(
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_CompletionResults.unranked(completionItems, isIncomplete: false),
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);
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}
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/// Returns true if [node] is part of an invocation and already has an argument
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@ -708,6 +714,31 @@ class CompletionHandler extends MessageHandler<CompletionParams, CompletionList>
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return true; // Any other trigger character can be handled always.
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}
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/// Truncates [items] to [maxItems] but additionally includes any items that
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/// exactly match [prefix].
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Iterable<CompletionItem> _truncateResults(
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List<CompletionItem> items,
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String prefix,
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int maxItems,
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) {
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// Take the top `maxRankedItem` plus any exact matches.
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final prefixLower = prefix.toLowerCase();
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bool isExactMatch(CompletionItem item) =>
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(item.filterText ?? item.label).toLowerCase() == prefixLower;
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// Sort the items by relevance using sortText.
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items.sort(sortTextComparer);
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// Skip the text comparisons if we don't have a prefix (plugin results, or
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// just no prefix when completion was invoked).
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final shouldInclude = prefixLower.isEmpty
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? (int index, CompletionItem item) => index < maxItems
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: (int index, CompletionItem item) =>
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index < maxItems || isExactMatch(item);
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return items.whereIndexed(shouldInclude);
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}
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/// Compares [CompletionItem]s by the `sortText` field, which is derived from
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/// relevance.
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///
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@ -750,13 +781,28 @@ class _CompletionResults {
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/// Items that cannot be ranked, and should avoid being truncated.
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final List<CompletionItem> unrankedItems;
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/// Any prefixed used to filter the results.
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final String targetPrefix;
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final bool isIncomplete;
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_CompletionResults({
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this.rankedItems = const [],
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this.unrankedItems = const [],
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required this.targetPrefix,
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required this.isIncomplete,
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});
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_CompletionResults.empty() : this(targetPrefix: '', isIncomplete: false);
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_CompletionResults.unranked(
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List<CompletionItem> unrankedItems, {
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required bool isIncomplete,
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}) : this(
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unrankedItems: unrankedItems,
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targetPrefix: '',
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isIncomplete: isIncomplete,
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);
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}
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/// Helper to simplify fuzzy filtering.
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@ -1117,6 +1117,51 @@ void f() {
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expect(res.items.map((item) => item.label).contains('aaa'), isTrue);
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}
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/// Exact matches should always be included when completion lists are
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/// truncated, even if they ranked poorly.
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Future<void> test_maxCompletionItems_doesNotExcludeExactMatches() async {
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final content = '''
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import 'a.dart';
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void f() {
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var a = Item^
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}
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''';
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// Create classes `Item1` to `Item20` along with a field named `item`.
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// The classes will rank higher in the position above and push
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// the field out without an exception to include exact matches.
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newFile(
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join(projectFolderPath, 'lib', 'a.dart'),
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[
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'String item = "";',
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for (var i = 1; i <= 20; i++) 'class Item$i {}',
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].join('\n'),
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);
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final initialAnalysis = waitForAnalysisComplete();
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await provideConfig(
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() => initialize(
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workspaceCapabilities: withApplyEditSupport(
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withConfigurationSupport(emptyWorkspaceClientCapabilities))),
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{'maxCompletionItems': 10},
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);
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await openFile(mainFileUri, withoutMarkers(content));
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await initialAnalysis;
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final res =
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await getCompletionList(mainFileUri, positionFromMarker(content));
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// We expect 11 items, because the exact match was not in the top 10 and
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// was included additionally.
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expect(res.items, hasLength(11));
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expect(res.isIncomplete, isTrue);
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// Ensure the 'Item' field is included.
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expect(
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res.items.map((item) => item.label),
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contains('item'),
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);
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}
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/// Snippet completions should be kept when maxCompletionItems truncates
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/// because they are not ranked like other completions and might be
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/// truncated when they are exactly what the user wants.
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@ -1128,11 +1173,11 @@ void f() {
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}
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''';
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// Create a class with fields for1 to for20 in the other file.
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// Create fields for1 to for20 in the other file.
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newFile(
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join(projectFolderPath, 'lib', 'a.dart'),
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[
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for (var i = 1; i <= 20; i++) ' String for$i = ' ';',
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for (var i = 1; i <= 20; i++) 'String for$i = ' ';',
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].join('\n'),
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);
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@ -1154,8 +1199,7 @@ void f() {
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expect(res.items, hasLength(10));
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expect(res.isIncomplete, isTrue);
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// Also ensure the 'for' snippet is included.
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// Ensure the 'for' snippet is included.
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expect(
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res.items
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.where((item) => item.kind == CompletionItemKind.Snippet)
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