public SyntaxPattern Add(IFunctionDeclaration declaration)
{
var syntaxPattern = new SyntaxPattern(declaration);
var overlap = _sorted.GetViewBetween(syntaxPattern, syntaxPattern);
switch (overlap.Count)
{
case 0: // no overlap => just add it
_sorted.Add(syntaxPattern);
break;
case 1: // one overlap exists => merge with new declaration
syntaxPattern = overlap.First();
MergeDeclaration(syntaxPattern, declaration);
break;
default: // multiple overlaps => join them to new pattern
// overlap is a view - only valid when _sorted is not changed
foreach (var pattern in overlap)
{
foreach (var member in pattern.Members)
{
MergeDeclaration(syntaxPattern, member);
}
}
_sorted.RemoveWhere(x => x.Overlaps(syntaxPattern)); // remove existing overlaps
_sorted.Add(syntaxPattern); // add the new bundle
break;
}
return(syntaxPattern);
}
static void MergeDeclaration(SyntaxPattern syntaxPattern, IFunctionDeclaration declaration)
{
if (syntaxPattern.Members.Contains(declaration))
{
return;
}
syntaxPattern.MinArgumentCount = Math.Min(syntaxPattern.MinArgumentCount, declaration.MandatoryRightArgumentCount());
if (syntaxPattern.MaxArgumentCount.HasValue)
{
var max = declaration.MaxRightArgumentCount();
syntaxPattern.MaxArgumentCount = !max.HasValue
? null
: (int?)Math.Max(syntaxPattern.MaxArgumentCount.Value, max.Value);
}
syntaxPattern.Members.Add(declaration);
}