private bool ParseUnaryOperator(Tokenizer tokenizer, TokenOperator token)
{
// Handle group
if (token.OpType == TokenOperator.OperatorType.GroupStart)
{
// Consume token
tokenizer.Next();
return(ParseGroup(tokenizer));
}
else if (token.OpType == TokenOperator.OperatorType.VectorStart)
{
// Consume token
tokenizer.Next();
return(ParseVector(tokenizer, false));
}
bool ret = true;
switch (token.OpType)
{
case TokenOperator.OperatorType.Minus:
token = new TokenOperator(TokenOperator.OperatorType.UnaryMinus, "-");
break;
case TokenOperator.OperatorType.Plus:
token = new TokenOperator(TokenOperator.OperatorType.UnaryPlus, "+");
break;
case TokenOperator.OperatorType.Negate:
break;
case TokenOperator.OperatorType.Complement:
break;
default:
Error("Expected unary operator (-, +, !) but got `" + token.Text + "'", tokenizer);
ret = false;
break;
}
if (ret)
{
tokenizer.Next();
ret = ParseExpression(tokenizer, token.Properties.Priority, token.Properties.LeftAssoc);
}
if (ret)
{
Instruction inst = new InstructionFunction(token.Text, Operations.LookupOperator(token.OpType, 1), 1);
if (inst != null)
{
d_instructions.Add(inst);
}
}
return(ret);
}
private bool ParseVector(Tokenizer tokenizer, bool indexer)
{
Token next = tokenizer.Peek();
bool loopit = true;
int numargs = 0;
if (next != null && (next is TokenOperator) && ((TokenOperator)next).OpType == TokenOperator.OperatorType.VectorEnd)
{
// Consume vector end
tokenizer.Next();
loopit = false;
}
while (loopit)
{
if (!ParseExpression(tokenizer, -1, false))
{
return(false);
}
++numargs;
// See what is next
next = tokenizer.Peek();
if (next == null || !(next is TokenOperator))
{
return(Error("Expected `operator', but got " + (next != null ? next.Text : "(nothing)"), tokenizer));
}
TokenOperator nextop = next as TokenOperator;
if (nextop.OpType == TokenOperator.OperatorType.VectorEnd)
{
// Consume it
tokenizer.Next();
break;
}
else if (nextop.OpType != TokenOperator.OperatorType.Comma)
{
return(Error("Expected `,' but got " + next.Text, tokenizer));
}
// Consume token
tokenizer.Next();
}
if (indexer)
{
InstructionFunction f = d_instructions[d_instructions.Count - 1] as InstructionFunction;
if (numargs == 1 && f != null && f.Name == "..")
{
d_instructions.Remove(f);
d_instructions.Add(new InstructionIndexRange());
}
else
{
d_instructions.Add(new InstructionIndex(numargs));
}
}
else
{
d_instructions.Add(new InstructionVector(numargs));
}
return(true);
}
