private void _VisitDeclareNode(ASTDeclareNode node)
{
if (_Tables.Lookup(node.LeftChild.Value.Value) != null)
{
throw new Exception("Variable " + node.LeftChild.Value.Value + " is defined more than once!");
}
_Tables.Define(node.LeftChild.Value.Value, node.RightChild.Value.Value);
}
private void _VisitDeclare(ASTDeclareNode node)
{
TokenType type = node.RightChild.Value.Type;
string name = node.LeftChild.Value.Value;
switch (type)
{
case TokenType.FLOAT:
GLOBAL_SCOPE.Add(name, (float)0);
return;
case TokenType.INT:
GLOBAL_SCOPE.Add(name, (int)0);
return;
default:
throw new Exception("Unknown type: " + type.ToString());
}
}
private ASTNode _DeclareStatement()
{
var type = _CurrentToken;
if (_CurrentToken.Type == TokenType.INT ||
_CurrentToken.Type == TokenType.FLOAT)
{
_Eat(_CurrentToken.Type);
}
else
{
throw new Exception("Unexpected token: " + type.Value + ". Expected a type.");
}
//Parse the current token as a variable
ASTVarNode name = _Variable();
ASTDeclareNode node = new ASTDeclareNode(name, new ASTTypeNode(type));
_Eat(TokenType.SEMI);
return(node);
//TODO: Support assigning to a just-declared variable
}
