private static bool TryInvokeSnippetCompletion(
CompletionService completionService, Document document, SourceText text, int caretPoint)
{
var rules = completionService.GetRules();
// Do not invoke snippet if the corresponding rule is not set in options.
if (rules.SnippetsRule != SnippetsRule.IncludeAfterTypingIdentifierQuestionTab)
{
return(false);
}
var syntaxFactsOpt = document.GetLanguageService <ISyntaxFactsService>();
// Snippets are included if the user types: <quesiton><tab>
// If at least one condition for snippets do not hold, bail out.
if (syntaxFactsOpt == null ||
caretPoint < 3 ||
text[caretPoint - 2] != '?' ||
!QuestionMarkIsPrecededByIdentifierAndWhitespace(text, caretPoint - 2, syntaxFactsOpt))
{
return(false);
}
// Because <question><tab> is actually a command to bring up snippets,
// we delete the last <question> that was typed.
var textChange = new TextChange(TextSpan.FromBounds(caretPoint - 2, caretPoint), string.Empty);
document.Project.Solution.Workspace.ApplyTextChanges(document.Id, textChange, CancellationToken.None);
return(true);
}
internal virtual void VerifyCustomCommitWorker(
CompletionService service,
ICustomCommitCompletionProvider customCommitCompletionProvider,
CompletionItem completionItem,
CompletionHelper completionRules,
ITextView textView,
ITextBuffer textBuffer,
string codeBeforeCommit,
string expectedCodeAfterCommit,
char?commitChar = null)
{
MarkupTestFile.GetPosition(expectedCodeAfterCommit, out var actualExpectedCode, out int expectedCaretPosition);
if (commitChar.HasValue &&
!Controller.IsCommitCharacter(service.GetRules(), completionItem, commitChar.Value, commitChar.Value.ToString()))
{
Assert.Equal(codeBeforeCommit, actualExpectedCode);
return;
}
customCommitCompletionProvider.Commit(completionItem, textView, textBuffer, textView.TextSnapshot, commitChar);
string actualCodeAfterCommit = textBuffer.CurrentSnapshot.AsText().ToString();
var caretPosition = textView.Caret.Position.BufferPosition.Position;
Assert.Equal(actualExpectedCode, actualCodeAfterCommit);
Assert.Equal(expectedCaretPosition, caretPosition);
}
protected CompletionHelper(CompletionService completionService)
{
CompletionService = completionService;
_language = CompletionService.Language;
_rules = CompletionService.GetRules();
}