ToBooleanLiteral.cs

using System.Numerics;
using Waher.Content;
using Waher.Content.Semantic.Model.Literals;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
 
namespace Waher.Script.Persistence.SPARQL.Functions.TypeConversion
{
    public class ToBooleanLiteral : SemanticConversionFunction
    {
        public ToBooleanLiteral()
            : base()
        {
        }
 
        public ToBooleanLiteral(ScriptNode Argument, int Start, int Length, Expression Expression)
            : base(Argument, Start, Length, Expression)
        {
        }
 
        public override ScriptNode CreateFunction(ScriptNode Argument, int Start, int Length, Expression Expression)
        {
            return new ToBooleanLiteral(Argument, Start, Length, Expression);
        }
 
        public override string FunctionName => BooleanLiteral.TypeUri;
 
        public override IElement Convert(object Value)
        {
            if (Value is bool b)
                return new BooleanLiteral(b);
            else if (Value is string s)
            {
                if (CommonTypes.TryParse(s, out b))
                    return new BooleanLiteral(b);
            }
            else if (Value is double d)
                return new BooleanLiteral(d != 0);
            else if (Value is Complex z)
                return new BooleanLiteral(z != Complex.Zero);
        
            b = System.Convert.ToBoolean(Value);
            return new BooleanLiteral(b);
        }
    }
}