public sealed override bool ShouldTriggerCompletion(SourceText text, int caretPosition, CompletionTrigger trigger, OptionSet options)
{
var lineStart = text.Lines.GetLineFromPosition(caretPosition).Start;
// check if the line starts with {whitespace}#{whitespace}{DirectiveName}{whitespace}"
var poundIndex = text.IndexOfNonWhiteSpace(lineStart, caretPosition - lineStart);
if (poundIndex == -1 || text[poundIndex] != '#')
{
return(false);
}
var directiveNameStartIndex = text.IndexOfNonWhiteSpace(poundIndex + 1, caretPosition - poundIndex - 1);
if (directiveNameStartIndex == -1 || !text.ContentEquals(directiveNameStartIndex, DirectiveName))
{
return(false);
}
var directiveNameEndIndex = directiveNameStartIndex + DirectiveName.Length;
var quoteIndex = text.IndexOfNonWhiteSpace(directiveNameEndIndex, caretPosition - directiveNameEndIndex);
if (quoteIndex == -1 || text[quoteIndex] != '"')
{
return(false);
}
return(true);
}