First Characters#

using System;
using UnityEngine;
using VisualScript.Icons;

namespace VisualScript.Runtime
{
    [Get]

    [Title("First Characters")]
    [Category("Operations/Extract/First Characters")]

    [Description("Extracts the leftmost characters of a text")]
    [Image(typeof(IconString), ColorTheme.Type.Yellow, typeof(BadgeArrowLeft))]

    [Parameter("Text", "The text to extract the characters from")]
    [Parameter("Amount", "How many characters are taken from the beginning")]

    [Keywords("Left", "Start", "Begin", "Head", "Take", "Text")]

    [Serializable]
    public class TypeStringFirstCharacters : TypeString
    {
        [SerializeField] private GetString m_Text = new GetString();
        [SerializeField] private GetInteger m_Amount = new GetInteger(1);

        public override string GetPreview(GameObject source) => First(
            this.m_Text.GetPreview(source),
            (int) this.m_Amount.GetPreview(source)
        );

        public override string Get(Args args) => First(
            this.m_Text.Get(args),
            this.m_Amount.GetInt(args)
        );

        private static string First(string text, int amount)
        {
            if (string.IsNullOrEmpty(text) || amount <= 0) return string.Empty;
            return text.Substring(0, Mathf.Min(amount, text.Length));
        }

        public override string ToString()
        {
            return $"First {this.m_Amount} of {this.m_Text}";
        }

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