public static TreeNode VariableSet(EvaluatorBase evaluator, TreeNode [] args, bool update)
{
if (args.Length != 2)
{
throw new ArgumentException("must have two arguments");
}
if (!(args[0] is FunctionNode))
{
throw new ArgumentException("first argument must be a variable");
}
FunctionNode variable_node = evaluator.ResolveFunction(args[0] as FunctionNode);
if (variable_node != null)
{
variable_node.Body = evaluator.Evaluate(args[1]);
}
else
{
TreeNode parent = args[0].Parent;
parent = parent.Parent ?? parent;
parent.RegisterFunction((args[0] as FunctionNode).Function, evaluator.Evaluate(args[1]));
}
return(new VoidLiteral());
}
public virtual TreeNode OnDefine(TreeNode [] args)
{
if (args.Length < 2 || args.Length > 3)
{
throw new ArgumentException("define must have two or three arguments");
}
if (!(args[0] is FunctionNode))
{
throw new ArgumentException("first define argument must be a variable");
}
FunctionNode function = new FunctionNode((args[0] as FunctionNode).Function, args[args.Length - 1]);
if (args.Length == 3 && args[1].HasChildren)
{
foreach (TreeNode function_arg in args[1].Children)
{
if (!(function_arg is FunctionNode))
{
throw new ArgumentException("define function arguments must be variable tokens");
}
function.RegisterFunction((function_arg as FunctionNode).Function, new VoidLiteral());
}
}
TreeNode parent = args[0].Parent;
parent = parent.Parent ?? parent;
parent.RegisterFunction(function.Function, function);
return(new VoidLiteral());
}
public void RegisterVariable(string name, string value)
{
expression.RegisterFunction(name, value);
}
