Count Occurrences#

using System;
using UnityEngine;
using VisualScript.Icons;

namespace VisualScript.Runtime
{
    [Get]

    [Title("Count Occurrences")]
    [Category("Strings/Count Occurrences")]

    [Description("How many times a text is found inside another one, without overlapping")]
    [Image(typeof(IconTally), ColorTheme.Type.Yellow, typeof(BadgeMagnifier))]

    [Parameter("Text", "The text where the occurrences are searched")]
    [Parameter("Find", "The text that is searched for")]
    [Parameter("Ignore Case", "Whether upper and lower case characters are considered the same")]

    [Keywords("String", "Amount", "Times", "Repetitions", "Find", "Search")]

    [Serializable]
    public class TypeNumberStringCountOccurrences : TypeNumber
    {
        [SerializeField] private GetString m_Text = new GetString();
        [SerializeField] private GetString m_Find = new GetString();
        [SerializeField] private GetBool m_IgnoreCase = new GetBool(false);

        public override double GetPreview(GameObject source) => Count(
            this.m_Text.GetPreview(source),
            this.m_Find.GetPreview(source),
            this.m_IgnoreCase.GetPreview(source)
        );

        public override double Get(Args args) => Count(
            this.m_Text.Get(args),
            this.m_Find.Get(args),
            this.m_IgnoreCase.Get(args)
        );

        private static double Count(string text, string find, bool ignoreCase)
        {
            if (string.IsNullOrEmpty(text) || string.IsNullOrEmpty(find)) return 0;

            StringComparison comparison = ignoreCase
                ? StringComparison.OrdinalIgnoreCase
                : StringComparison.Ordinal;

            int count = 0;
            int index = text.IndexOf(find, comparison);

            while (index >= 0)
            {
                count += 1;
                index = text.IndexOf(find, index + find.Length, comparison);
            }

            return count;
        }

        public override string ToString()
        {
            return $"Count {this.m_Find} in {this.m_Text}";
        }

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