ObjectExNihiloOutput.cs

using System;
using System.Collections.Generic;
using System.Text;
using Waher.Runtime.Inventory;
using Waher.Script.Abstraction.Elements;
 
namespace Waher.Script.Output
{
    public class ObjectExNihiloOutput : ICustomStringOutput
    {
        public Grade Supports(Type Object) => Object == typeof(Dictionary<string, IElement>) ? Grade.Ok : Grade.NotAtAll;
 
        public string GetString(object Value)
        {
            Dictionary<string, IElement> ObjExNihilo = (Dictionary<string, IElement>)Value;
 
            StringBuilder sb = new StringBuilder();
            bool First = true;
 
            sb.Append('{');
 
            foreach (KeyValuePair<string, IElement> P in ObjExNihilo)
            {
                if (First)
                    First = false;
                else
                    sb.Append(',');
 
                if (CanBeVariable(P.Key))
                    sb.Append(P.Key);
                else
                {
                    sb.Append('"');
                    sb.Append(P.Key.
                        Replace("\\", "\\\\").
                        Replace("\"", "\\\"").
                        Replace("\n", "\\n").
                        Replace("\r", "\\r").
                        Replace("\t", "\\t").
                        Replace("\b", "\\b").
                        Replace("\f", "\\f").
                        Replace("\a", "\\a"));
                    sb.Append('"');
                }
 
                sb.Append(':');
                sb.Append(Expression.ToString(P.Value.AssociatedObjectValue));
            }
 
            sb.Append('}');
 
            return sb.ToString();
        }
 
        public static bool CanBeVariable(string Label)
        {
            bool HasLetters = false;
 
            foreach (char ch in Label)
            {
                if (char.IsLetter(ch))
                    HasLetters = true;
                else if (char.IsDigit(ch))
                {
                    if (!HasLetters)
                        return false;
                }
                else if (ch != '_')
                    return false;
            }
 
            return HasLetters;
        }
    }
}