BinaryDualBoolDoubleOperator.cs

using System;
using System.Runtime.ExceptionServices;
using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Objects;
 
namespace Waher.Script.Model
{
    public abstract class BinaryDualBoolDoubleOperator : BinaryScalarOperator
    {
        private bool? bothBool = null;
        private bool? bothDouble = null;
 
        public BinaryDualBoolDoubleOperator(ScriptNode Left, ScriptNode Right, int Start, int Length, Expression Expression)
            : base(Left, Right, Start, Length, Expression)
        {
        }
 
        public override IElement Evaluate(Variables Variables)
        {
            IElement L = this.left.Evaluate(Variables);
            IElement R = null;
            IElement Result;
            BooleanValue BL = L as BooleanValue;
            BooleanValue BR;
 
            if (this.bothBool.HasValue && this.bothBool.Value && !(BL is null))
            {
                bool LValue = BL.Value;
                Result = this.EvaluateOptimizedResult(LValue);
                if (!(Result is null))
                    return Result;
 
                R = this.right.Evaluate(Variables);
                BR = R as BooleanValue;
 
                if (!(BR is null))
                    return this.Evaluate(LValue, BR.Value);
                else
                    this.bothBool = false;
            }
 
            if (R is null)
            {
                if (!(BL is null) && !this.bothBool.HasValue)
                {
                    try
                    {
                        R = this.right.Evaluate(Variables);
                        BR = R as BooleanValue;
 
                        if (!(BR is null))
                        {
                            this.bothBool = true;
                            return this.Evaluate(BL.Value, BR.Value);
                        }
                        else
                            this.bothBool = false;
                    }
                    catch (Exception ex)
                    {
                        Result = this.EvaluateOptimizedResult(BL.Value);
                        if (Result is null)
                            ExceptionDispatchInfo.Capture(ex).Throw();
                        else
                        {
                            this.bothBool = true;
                            return Result;
                        }
                    }
                }
                else
                    R = this.right.Evaluate(Variables);
            }
 
            if (this.bothDouble.HasValue)
            {
                if (this.bothDouble.Value)
                {
                    if (L.AssociatedObjectValue is double DL && R.AssociatedObjectValue is double DR)
                        return this.Evaluate(DL, DR);
                    else
                        this.bothDouble = false;
                }
            }
            else
            {
                if (L.AssociatedObjectValue is double DL && R.AssociatedObjectValue is double DR)
                {
                    this.bothDouble = true;
                    return this.Evaluate(DL, DR);
                }
                else
                    this.bothDouble = false;
            }
 
            return this.Evaluate(L, R, Variables);
        }
 
        public override async Task<IElement> EvaluateAsync(Variables Variables)
        {
            if (!this.isAsync)
                return this.Evaluate(Variables);
 
            IElement L = await this.left.EvaluateAsync(Variables);
            IElement R = null;
            IElement Result;
            BooleanValue BL = L as BooleanValue;
            BooleanValue BR;
 
            if (this.bothBool.HasValue && this.bothBool.Value && !(BL is null))
            {
                bool LValue = BL.Value;
                Result = await this.EvaluateOptimizedResultAsync(LValue);
                if (!(Result is null))
                    return Result;
 
                R = await this.right.EvaluateAsync(Variables);
                BR = R as BooleanValue;
 
                if (!(BR is null))
                    return await this.EvaluateAsync(LValue, BR.Value);
                else
                    this.bothBool = false;
            }
 
            if (R is null)
            {
                if (!(BL is null) && !this.bothBool.HasValue)
                {
                    try
                    {
                        R = await this.right.EvaluateAsync(Variables);
                        BR = R as BooleanValue;
 
                        if (!(BR is null))
                        {
                            this.bothBool = true;
                            return await this.EvaluateAsync(BL.Value, BR.Value);
                        }
                        else
                            this.bothBool = false;
                    }
                    catch (Exception ex)
                    {
                        Result = await this.EvaluateOptimizedResultAsync(BL.Value);
                        if (Result is null)
                            ExceptionDispatchInfo.Capture(ex).Throw();
                        else
                        {
                            this.bothBool = true;
                            return Result;
                        }
                    }
                }
                else
                    R = await this.right.EvaluateAsync(Variables);
            }
 
            if (this.bothDouble.HasValue)
            {
                if (this.bothDouble.Value)
                {
                    if (L.AssociatedObjectValue is double DL && R.AssociatedObjectValue is double DR)
                        return await this.EvaluateAsync(DL, DR);
                    else
                        this.bothDouble = false;
                }
            }
            else
            {
                if (L.AssociatedObjectValue is double DL && R.AssociatedObjectValue is double DR)
                {
                    this.bothDouble = true;
                    return await this.EvaluateAsync(DL, DR);
                }
                else
                    this.bothDouble = false;
            }
 
            return await this.EvaluateAsync(L, R, Variables);
        }
 
        public override IElement EvaluateScalar(IElement Left, IElement Right, Variables Variables)
        {
            if (Left.AssociatedObjectValue is bool BL &&
                Right.AssociatedObjectValue is bool BR)
            {
                return this.Evaluate(BL, BR);
            }
            else
            {
                if (!(Left.AssociatedObjectValue is double l) &&
                    !Expression.TryConvert(Left.AssociatedObjectValue, out l))
                {
                    throw new ScriptRuntimeException("Scalar operands must be double values.", this);
                }
 
                if (!(Right.AssociatedObjectValue is double r) &&
                    !Expression.TryConvert(Right.AssociatedObjectValue, out r))
                {
                    throw new ScriptRuntimeException("Scalar operands must be double values.", this);
                }
 
                return this.Evaluate(l, r);
            }
        }
 
        public override Task<IElement> EvaluateScalarAsync(IElement Left, IElement Right, Variables Variables)
        {
            if (Left.AssociatedObjectValue is bool BL &&
                Right.AssociatedObjectValue is bool BR)
            {
                return this.EvaluateAsync(BL, BR);
            }
            else
            {
                if (!(Left.AssociatedObjectValue is double l) &&
                    !Expression.TryConvert(Left.AssociatedObjectValue, out l))
                {
                    throw new ScriptRuntimeException("Scalar operands must be double values.", this);
                }
 
                if (!(Right.AssociatedObjectValue is double r) &&
                    !Expression.TryConvert(Right.AssociatedObjectValue, out r))
                {
                    throw new ScriptRuntimeException("Scalar operands must be double values.", this);
                }
 
                return this.EvaluateAsync(l, r);
            }
        }
 
        public abstract IElement EvaluateOptimizedResult(bool Left);
 
        public abstract IElement Evaluate(bool Left, bool Right);
 
        public abstract IElement Evaluate(double Left, double Right);
 
        public virtual Task<IElement> EvaluateOptimizedResultAsync(bool Left)
        {
            return Task.FromResult<IElement>(this.EvaluateOptimizedResult(Left));
        }
 
        public virtual Task<IElement> EvaluateAsync(bool Left, bool Right)
        {
            return Task.FromResult<IElement>(this.Evaluate(Left, Right));
        }
 
        public virtual Task<IElement> EvaluateAsync(double Left, double Right)
        {
            return Task.FromResult<IElement>(this.Evaluate(Left, Right));
        }
 
    }
}