Add-d-ds s-s-stut-ttering t-to the g-gam-me (#4901)

Content.Server/Speech/EntitySystems/StutteringSystem.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Text;
+using System.Text.RegularExpressions;
+using Content.Server.Alert;
+using Content.Server.Speech.Components;
+using Content.Shared.Alert;
+using Content.Shared.Speech.EntitySystems;
+using Content.Shared.StatusEffect;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Random;
+
+namespace Content.Server.Speech.EntitySystems
+{
+    public class StutteringSystem : SharedStutteringSystem
+    {
+        [Dependency] private readonly StatusEffectsSystem _statusEffectsSystem = default!;
+        [Dependency] private readonly IRobustRandom _random = default!;
+
+        private const string StutterKey = "Stutter";
+
+        // Regex of characters to stutter.
+        private static readonly Regex Stutter = new(@"[b-df-hj-np-tv-wxyz]",
+            RegexOptions.Compiled | RegexOptions.IgnoreCase);
+
+        public override void Initialize()
+        {
+            SubscribeLocalEvent<StutteringAccentComponent, AccentGetEvent>(OnAccent);
+        }
+
+        public override void DoStutter(EntityUid uid, TimeSpan time, StatusEffectsComponent? status = null, SharedAlertsComponent? alerts = null)
+        {
+            if (!Resolve(uid, ref status, false))
+                return;
+
+            if (!_statusEffectsSystem.HasStatusEffect(uid, StutterKey, status))
+                _statusEffectsSystem.TryAddStatusEffect<StutteringAccentComponent>(uid, StutterKey, time, status, alerts);
+            else
+                _statusEffectsSystem.TryAddTime(uid, StutterKey, time, status);
+        }
+
+        private void OnAccent(EntityUid uid, StutteringAccentComponent component, AccentGetEvent args)
+        {
+            args.Message = Accentuate(args.Message);
+        }
+
+        public string Accentuate(string message)
+        {
+            var length = message.Length;
+
+            var finalMessage = new StringBuilder();
+
+            string newLetter;
+
+            for (var i = 0; i < length; i++)
+            {
+                newLetter = message[i].ToString();
+                if (Stutter.IsMatch(newLetter) && _random.Prob(0.8f))
+                {
+                    if (_random.Prob(0.1f))
+                    {
+                        newLetter = $"{newLetter}-{newLetter}-{newLetter}-{newLetter}";
+                    }
+                    else if (_random.Prob(0.2f))
+                    {
+                        newLetter = $"{newLetter}-{newLetter}-{newLetter}";
+                    }
+                    else if (_random.Prob(0.05f))
+                    {
+                        newLetter = "";
+                    }
+                    else
+                    {
+                        newLetter = $"{newLetter}-{newLetter}";
+                    }
+                }
+
+                finalMessage.Append(newLetter);
+            }
+
+            return finalMessage.ToString();
+        }
+    }
+}