private static CompletionAnalysis TrySpecialCompletions(ReverseExpressionParser parser, Span loc)
{
if (parser.Tokens.Count > 0)
{
// Check for context-sensitive intellisense
var lastClass = parser.Tokens[parser.Tokens.Count - 1];
if (lastClass.ClassificationType == parser.Classifier.Provider.Comment)
{
// No completions in comments
return(CompletionAnalysis.EmptyCompletionContext);
}
else if (lastClass.ClassificationType == parser.Classifier.Provider.StringLiteral)
{
// String completion
return(new StringLiteralCompletionList(lastClass.Span.GetText(), loc.Start, parser.Span, parser.Buffer));
}
// Import completions
var first = parser.Tokens[0];
if (CompletionAnalysis.IsKeyword(first, "import"))
{
return(ImportCompletionAnalysis.Make(first, lastClass, loc, parser.Snapshot, parser.Span, parser.Buffer, IsSpaceCompletion(parser, loc)));
}
else if (CompletionAnalysis.IsKeyword(first, "from"))
{
return(FromImportCompletionAnalysis.Make(parser.Tokens, first, loc, parser.Snapshot, parser.Span, parser.Buffer, IsSpaceCompletion(parser, loc)));
}
return(null);
}
return(CompletionAnalysis.EmptyCompletionContext);
}
public static CompletionAnalysis Make(IList <ClassificationSpan> tokens, ITrackingSpan span, ITextBuffer textBuffer, CompletionOptions options)
{
Debug.Assert(tokens[0].Span.GetText() == "from");
var ns = new List <string>();
bool nsComplete = false;
bool seenImport = false;
bool seenName = false;
bool seenAs = false;
bool seenAlias = false;
bool includeStar = true;
foreach (var token in tokens.Skip(1))
{
if (token == null || token.Span.End > span.GetEndPoint(textBuffer.CurrentSnapshot).Position)
{
break;
}
if (!seenImport)
{
if (token.ClassificationType.IsOfType(PredefinedClassificationTypeNames.Identifier))
{
ns.Add(token.Span.GetText());
nsComplete = true;
}
else if (token.ClassificationType.IsOfType(PythonPredefinedClassificationTypeNames.Dot))
{
nsComplete = false;
}
seenImport = IsKeyword(token, "import");
}
else if (token.ClassificationType.IsOfType(PythonPredefinedClassificationTypeNames.Comma))
{
seenName = false;
seenAs = false;
seenAlias = false;
includeStar = false;
}
else if (token.Span.GetText() == "*")
{
// Nothing comes after a star
return(EmptyCompletionContext);
}
else if (IsKeyword(token, "as"))
{
seenAs = true;
}
else if (token.ClassificationType.IsOfType(PredefinedClassificationTypeNames.Identifier))
{
if (seenAlias)
{
return(EmptyCompletionContext);
}
else if (seenAs)
{
seenAlias = true;
}
else if (seenName)
{
return(EmptyCompletionContext);
}
else
{
seenName = true;
}
}
else
{
includeStar = false;
}
}
if (!seenImport)
{
if (nsComplete)
{
return(new ImportKeywordCompletionAnalysis(span, textBuffer, options));
}
else
{
return(ImportCompletionAnalysis.Make(tokens, span, textBuffer, options));
}
}
if (!nsComplete || seenAlias || seenAs)
{
return(EmptyCompletionContext);
}
if (seenName)
{
return(new AsKeywordCompletionAnalysis(span, textBuffer, options));
}
return(new FromImportCompletionAnalysis(ns.ToArray(), includeStar, span, textBuffer, options));
}