public (List <RhetosSignature> signatures, int?activeSignature, int?activeParameter) GetSignatureHelpAtPosition(LineChr lineChr)
{
var analysis = GetAnalysis(lineChr);
if (analysis.KeywordToken == null || analysis.IsAfterAnyErrorLine(lineChr))
{
return(null, null, null);
}
var signaturesWithDocumentation = conceptQueries.GetSignaturesWithDocumentation(analysis.KeywordToken.Value);
var validConcepts = analysis.GetValidConceptsWithActiveParameter();
if (!validConcepts.Any())
{
return(signaturesWithDocumentation, null, null);
}
var sortedConcepts = validConcepts
.Select(valid =>
(
valid.conceptType,
valid.activeParamater,
parameterCount: ConceptTypeTools.GetParameters(valid.conceptType).Count,
documentation: signaturesWithDocumentation.Single(sig => sig.ConceptType == valid.conceptType)
))
.OrderBy(valid => valid.activeParamater >= valid.parameterCount)
.ThenBy(valid => valid.parameterCount)
.ThenBy(valid => valid.conceptType.TypeName)
.ToList();
var activeParameter = sortedConcepts.First().activeParamater;
return(sortedConcepts.Select(sorted => sorted.documentation).ToList(), 0, activeParameter);
}
private int GetActiveParameterForValidConcept(ConceptType conceptType)
{
var activeParameter = 0;
// we have parsed some members successfully for this concept type
if (LastTokenParsed.ContainsKey(conceptType))
{
activeParameter = ConceptTypeTools.IndexOfParameter(conceptType, LastMemberReadAttempt[conceptType]);
// if we have just typed a keyword OR have stopped typing a parameter (by pressing space, etc.), we need to advance to next parameter
// keyword scenario is possible in nested concepts, where we already have valid parameters and are just typing a keyword
var lineChr = new LineChr(Line, Chr);
var atLastParsed = GetTokenAtPosition(lineChr) == LastTokenParsed[conceptType] || GetTokenLeftOfPosition(lineChr) == LastTokenParsed[conceptType];
var atKeyword = string.Equals(conceptType.Keyword, LastTokenParsed[conceptType].Value, StringComparison.InvariantCultureIgnoreCase);
if (atKeyword || !atLastParsed)
{
activeParameter++;
}
}
return(activeParameter);
}