VectorWhileDoDefinition.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Model;
using Waher.Script.Objects;
using Waher.Script.Operators.Conditional;
 
namespace Waher.Script.Operators.Vectors
{
    public class VectorWhileDoDefinition : BinaryOperator
    {
        public VectorWhileDoDefinition(WhileDo Elements, int Start, int Length, Expression Expression)
            : base(Elements.LeftOperand, Elements.RightOperand, Start, Length, Expression)
        {
        }
 
        public override IElement Evaluate(Variables Variables)
        {
            LinkedList<IElement> Elements = new LinkedList<IElement>();
            BooleanValue Condition;
 
            Condition = this.left.Evaluate(Variables) as BooleanValue;
            if (Condition is null)
                throw new ScriptRuntimeException("Condition must evaluate to a boolean value.", this);
 
            while (Condition.Value)
            {
                Elements.AddLast(this.right.Evaluate(Variables));
 
                Condition = this.left.Evaluate(Variables) as BooleanValue;
                if (Condition is null)
                    throw new ScriptRuntimeException("Condition must evaluate to a boolean value.", this);
            }
 
            return this.Encapsulate(Elements);
        }
 
        public override async Task<IElement> EvaluateAsync(Variables Variables)
        {
            if (!this.isAsync)
                return this.Evaluate(Variables);
 
            LinkedList<IElement> Elements = new LinkedList<IElement>();
            BooleanValue Condition;
 
            Condition = await this.left.EvaluateAsync(Variables) as BooleanValue;
            if (Condition is null)
                throw new ScriptRuntimeException("Condition must evaluate to a boolean value.", this);
 
            while (Condition.Value)
            {
                Elements.AddLast(await this.right.EvaluateAsync(Variables));
 
                Condition = await this.left.EvaluateAsync(Variables) as BooleanValue;
                if (Condition is null)
                    throw new ScriptRuntimeException("Condition must evaluate to a boolean value.", this);
            }
 
            return this.Encapsulate(Elements);
        }
        protected virtual IElement Encapsulate(LinkedList<IElement> Elements)
        {
            return VectorDefinition.Encapsulate(Elements, true, this);
        }
 
    }
}