public override bool TryParse(Scanner scanner, out TuningCommandletNode commandlet)
{
scanner.SkipOptional(':', true);
commandlet = new TuningCommandletNode();
var tuningString = scanner.ReadToLineEnd().Trim();
if (string.IsNullOrEmpty(tuningString))
{
this.Report(LogLevel.Suggestion, scanner.LastReadRange, Messages.Suggestion_TuningNotSpecified);
return(true);
}
var colonIndex = tuningString.LastIndexOf(':');
if (colonIndex >= 0)
{
var namePart = tuningString.Substring(0, colonIndex);
var namePartIsEmpty = namePart == string.Empty;
if (namePartIsEmpty)
{
this.Report(LogLevel.Hint, scanner.LastReadRange.From.AsRange(scanner.Source),
Messages.Hint_RedundantColonInTuningSpecifier);
}
else
{
commandlet.Name = new LiteralNode <string>(namePart,
new TextRange(scanner.LastReadRange.From,
namePart.Length,
scanner.Source));
}
var tuningPart = tuningString.Substring(colonIndex + 1).Trim();
if (tuningPart == string.Empty)
{
if (namePartIsEmpty)
{
this.Report(LogLevel.Suggestion, scanner.LastReadRange,
Messages.Suggestion_TuningNotSpecified);
return(true);
}
this.Report(LogLevel.Hint,
scanner.LastReadRange.From.OffsetColumn(colonIndex).AsRange(scanner.Source),
Messages.Hint_RedundantColonInTuningSpecifier);
}
else
{
scanner.SetPointer(scanner.LastReadRange.From.OffsetColumn(colonIndex + 1));
if (this.TryParseExplicitTuning(scanner, commandlet.StringTunings, namePart))
{
// todo: validate
//if (!namePartIsEmpty)
//{
// var namedTuning = Tunings.GetKnownTuning(namePart);
// if (namedTuning != null && namedTuning.InOctaveEquals(explicitTuning))
// {
// this.Report(ReportLevel.Hint, scanner.LastReadRange,
// ParseMessages.Hint_RedundantKnownTuningSpecifier, namedTuning.Name);
// }
//}
return(true);
}
return(false);
}
}
else
{
var tuning = Tunings.GetKnownTuning(tuningString);
if (tuning != null)
{
commandlet.Name = new LiteralNode <string>(tuningString, scanner.LastReadRange);
return(true);
}
scanner.SetPointer(scanner.LastReadRange.From);
if (this.TryParseExplicitTuning(scanner, commandlet.StringTunings))
{
return(true);
}
}
this.Report(LogLevel.Error, scanner.LastReadRange, Messages.Error_InvalidTuning);
commandlet = null;
return(false);
}