private AstItem ReadVector(TokenIterator tokens)
{
var name = tokens.Pop();
var bracket = tokens.Pop();
if (bracket.Kind != TokenKind.RoundBracketOpen)
{
throw new Exception("Unexcepted token after vector name! Expected '(', found: " + bracket);
}
var vectorValues = new List <List <Token> >();
var valueTokens = new List <Token>();
var bracketCounter = 0;
var token = tokens.Pop();
while (token != null)
{
if (token.Kind == TokenKind.RoundBracketOpen)
{
bracketCounter += 1;
valueTokens.Add(token);
}
else if (token.Kind == TokenKind.RoundBracketClose)
{
if (bracketCounter <= 0)
{
vectorValues.Add(valueTokens);
break;
}
else
{
bracketCounter -= 1;
valueTokens.Add(token);
}
}
else if (token.Kind == TokenKind.Comma)
{
vectorValues.Add(valueTokens);
valueTokens = new List <Token>();
}
else
{
valueTokens.Add(token);
}
token = tokens.Pop();
}
var paramExpressions = new List <AstItem>(vectorValues.Count);
foreach (var values in vectorValues)
{
var expression = ReadExpression(new TokenIterator(values), null);
paramExpressions.Add(expression);
}
//Need to pass the name so SemanticAnalysis knows if "vec" or (i.e.) "vec4f" was used
return(AstItem.Vector(name.Value, paramExpressions));
}