Ion law visuals (#22908)

Content.Client/UserInterface/RichText/ScrambleTag.cs

@@ -0,0 +1,41 @@
+using System.Text;
+using JetBrains.Annotations;
+using Robust.Client.UserInterface.RichText;
+using Robust.Shared.Timing;
+using Robust.Shared.Utility;
+
+namespace Content.Client.UserInterface.RichText;
+
+/// <summary>
+/// Adds a specified length of random characters that scramble at a set rate.
+/// </summary>
+[UsedImplicitly]
+public sealed class ScrambleTag : IMarkupTag
+{
+    [Dependency] private readonly IGameTiming _timing = default!;
+
+    public string Name => "scramble";
+
+    public string TextBefore(MarkupNode node)
+    {
+        if (!node.Attributes.TryGetValue("rate", out var rateParam) ||
+            !rateParam.TryGetLong(out var rate) ||
+            !node.Attributes.TryGetValue("length", out var lengthParam) ||
+            !lengthParam.TryGetLong(out var length) ||
+            !node.Attributes.TryGetValue("chars", out var charsParam) ||
+            !charsParam.TryGetString(out var chars))
+            return string.Empty;
+
+        var seed = (int) (_timing.CurTime.TotalMilliseconds / rate);
+        var rand = new Random(seed + node.GetHashCode());
+        var charOptions = chars.ToCharArray();
+        var sb = new StringBuilder();
+        for (var i = 0; i < length; i++)
+        {
+            var index = rand.Next() % charOptions.Length;
+            sb.Append(charOptions[index]);
+        }
+
+        return sb.ToString();
+    }
+}