private State ParseIndexer(Reader r, List <ExpressionNode> nodes)
{
var args = ArgumentListParser.Parse(r, '[', ']');
if (args.Count == 0)
{
throw new ExpressionParseException(r.Position, "Indexer may not be empty.");
}
nodes.Add(new StringIndexerNode(args));
return(State.AfterMember);
}
private State ParseRelativeSource(CharacterReader r, List <ExpressionNode> nodes)
{
var mode = IdentifierParser.Parse(r);
if (mode == "self")
{
nodes.Add(new SelfNode());
}
else if (mode == "parent")
{
Type ancestorType = null;
var ancestorLevel = 0;
if (PeekOpenBracket(r))
{
var args = ArgumentListParser.Parse(r, '[', ']', ';');
if (args.Count > 2 || args.Count == 0)
{
throw new ExpressionParseException(r.Position, "Too many arguments in RelativeSource syntax sugar");
}
else if (args.Count == 1)
{
if (int.TryParse(args[0], out int level))
{
ancestorType = null;
ancestorLevel = level;
}
else
{
var typeName = ParseTypeName(new CharacterReader(args[0]));
ancestorType = _typeResolver(typeName.ns, typeName.typeName);
}
}
else
{
var typeName = ParseTypeName(new CharacterReader(args[0]));
ancestorType = _typeResolver(typeName.ns, typeName.typeName);
ancestorLevel = int.Parse(args[1]);
}
}
nodes.Add(new FindAncestorNode(ancestorType, ancestorLevel));
}
else
{
throw new ExpressionParseException(r.Position, "Unknown RelativeSource mode.");
}
return(State.AfterMember);
}