public Expression LetToExpr(Node node)
{
var exprs = new List<Expression>();
foreach (var binding in node[0].Nodes) {
var name = binding[0].Text;
var param = AddBinding(Expression.Parameter(typeof(Object), name));
exprs.Add(param);
exprs.Add(Expression.Assign(Lookup(name), ToExpr(binding[1])));
}
exprs.Add(ToExpr(node["Term"]));
return Expression.Block(exprs);
}
public void Eval(MethodInfo mi)
{
var args = new List<dynamic>();
for (int i = 0; i < mi.GetParameters().Length; ++i)
args.Add(Pop());
var result = mi.Invoke(this, args.ToArray());
if (mi.ReturnType != typeof(void))
Push(result);
}