Matches.cs

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Threading.Tasks;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
using Waher.Script.Objects;
 
namespace Waher.Script.Operators.Membership
{
    public class Matches : BinaryOperator
    {
        public Matches(ScriptNode Left, ScriptNode Right, int Start, int Length, Expression Expression)
            : base(Left, Right, Start, Length, Expression)
        {
        }
 
        public override IElement Evaluate(Variables Variables)
        {
            IElement Left = this.left.Evaluate(Variables);
            return this.EvaluateMatches(Left, Variables);
        }
 
        private BooleanValue EvaluateMatches(IElement Left, Variables Variables)
        {
            Dictionary<string, IElement> AlreadyFound = new Dictionary<string, IElement>();
 
            switch (this.right.PatternMatch(Left, AlreadyFound))
            {
                case PatternMatchResult.Match:
                    foreach (KeyValuePair<string, IElement> P in AlreadyFound)
                        Variables[P.Key] = P.Value;
 
                    return BooleanValue.True;
 
                case PatternMatchResult.NoMatch:
                case PatternMatchResult.Unknown:
                default:
                    return BooleanValue.False;
            }
        }
 
        public override async Task<IElement> EvaluateAsync(Variables Variables)
        {
            if (!this.isAsync)
                return this.Evaluate(Variables);
            else
            {
                IElement Left = await this.left.EvaluateAsync(Variables);
                return this.EvaluateMatches(Left, Variables);
            }
        }
    }
}