public object EvaluateSub(Environment env, int layer, int type)
{
if (HasSuffix(layer))
{
if (layer > 65535)
{
throw new LepException("too much suffix", this);
}
object target = EvaluateSub(env, layer + 1, type);
IAstNode current = Suffix(layer);
ArgumentNode arg = current as ArgumentNode;
if (arg != null)
{
return(arg.Evaluate(env, target));
}
ExpressionArgumentNode exprArg = current as ExpressionArgumentNode;
if (exprArg != null)
{
return(exprArg.Evaluate(env, target));
}
ArrayReferenceNode arrRef = current as ArrayReferenceNode;
if (arrRef != null)
{
return(arrRef.Evaluate(env, target));
}
throw new LepException("bad suffix", this);
}
else if (Operand is NameNode)
{
return(((NameNode)Operand).Evaluate(env, type));
}
else
{
return(Operand.Evaluate(env));
}
}
private object Assign(Environment env, PrimaryNode left, string op, object rvalue, int type)
{
if (env == null)
{
throw new ArgumentNullException(nameof(env), "null environment");
}
if (left == null)
{
throw new ArgumentNullException(nameof(left), "null left name");
}
if (op == null)
{
throw new ArgumentNullException(nameof(op), "null operator");
}
if (left.IsName)
{
NameNode var = (NameNode)left.Operand;
if (op == "=")
{
env.Set(var.Name, rvalue, type);
return(rvalue);
}
else
{
object name = env.Get(var.Name, type);
if (name == null)
{
throw new LepException("undefined name: " + var.Name, this);
}
else
{
object result = ComputeOperator(name, op.Substring(0, op.Length - 1), rvalue);
env.Set(var.Name, result, type);
return(result);
}
}
}
else
{
ArrayReferenceNode arrRef = left.Suffix(0) as ArrayReferenceNode;
if (arrRef != null)
{
object lvalue = left.EvaluateSub(env, 1, type);
object[] arr = lvalue as object[];
if (arr != null)
{
object index = arrRef.Index.Evaluate(env);
if (index is int)
{
return(arr[(int)index] = rvalue);
}
}
Dictionary <object, object> table = lvalue as Dictionary <object, object>;
if (table != null)
{
object index = arrRef.Index.Evaluate(env);
return(table[index] = rvalue);
}
}
}
throw new LepException("bad assignment", this);
}
