Sanitize#

using System;
using System.Text;
using UnityEngine;
using VisualScript.Icons;

namespace VisualScript.Runtime
{
    [Get]

    [Title("Sanitize")]
    [Category("Operations/Transform/Sanitize")]

    [Description("Keeps letters and digits only, turns every whitespace run into a separator and drops the rest")]
    [Image(typeof(IconFilter), ColorTheme.Type.Yellow)]

    [Parameter("Text", "The text that is sanitized")]
    [Parameter("Separator", "The character that replaces each run of whitespaces")]
    [Parameter("Lower Case", "Whether the result is also converted to lower case")]

    [Keywords("Slug", "Url", "Clean", "Escape", "Safe", "Identifier", "Text")]

    [Serializable]
    public class TypeStringSanitize : TypeString
    {
        [SerializeField] private GetString m_Text = new GetString();
        [SerializeField] private GetString m_Separator = new GetString("-");
        [SerializeField] private GetBool m_LowerCase = new GetBool(true);

        [NonSerialized] private readonly StringBuilder m_Builder = new StringBuilder();

        public override string Get(Args args)
        {
            string text = this.m_Text.Get(args);
            if (string.IsNullOrEmpty(text)) return string.Empty;

            string separator = this.m_Separator.Get(args) ?? string.Empty;
            bool lowerCase = this.m_LowerCase.Get(args);

            this.m_Builder.Clear();
            bool pendingSeparator = false;

            foreach (char character in text)
            {
                if (char.IsLetterOrDigit(character))
                {
                    if (pendingSeparator && this.m_Builder.Length > 0) this.m_Builder.Append(separator);
                    this.m_Builder.Append(lowerCase ? char.ToLowerInvariant(character) : character);

                    pendingSeparator = false;
                    continue;
                }

                if (char.IsWhiteSpace(character)) pendingSeparator = true;
            }

            return this.m_Builder.ToString();
        }

        public override string ToString()
        {
            return $"Sanitize {this.m_Text}";
        }

        protected override SubscriptionMode Subscription => SubscriptionMode.OnChange;
    }
}