ShintenScript/ASTNodeNegative.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ShintenScript
{
    public class ASTNodeNegative : IASTNode
    {
        public IASTNode node;

        public ASTNodeNegative(IASTNode of)
        {
            node = of;
        }

        public bool Const()
        {
            return node.Const();
        }

        public object CreateFunction()
        {
            Func<ExecutionContext, float> func = (Func<ExecutionContext, float>)node.CreateFunction();
            return (Func<ExecutionContext, float>)(ctx => -func(ctx));
        }

        public SSType Type()
        {
            if (node.Type() != SSType.real)
                throw new TypeException($"Unary '-' operator not supported for {node.Type()}");

            return SSType.real;
        }
    }
}