From 500736e20fadf4a6c84bce74d25d92ca1a7713b4 Mon Sep 17 00:00:00 2001
From: Ellpeck <me@ellpeck.de>
Date: Sat, 7 Jan 2023 22:02:22 +0100
Subject: [PATCH] Added subscript and superscript formatting codes

---
 CHANGELOG.md                        |  1 +
 Demos/TextFormattingDemo.cs         |  2 +-
 MLEM/Formatting/Codes/SubSupCode.cs | 24 ++++++++++++++++++++++++
 MLEM/Formatting/TextFormatter.cs    |  6 ++++++
 4 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 MLEM/Formatting/Codes/SubSupCode.cs

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0baded..f4f756e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ Additions
 - Added TokenizedString.GetArea
 - Added InputHandler.WasPressedForLess and related methods as well as InputHandler.IsPressedIgnoreRepeats
 - Added RandomExtensions.NextSingle with minimum and maximum values
+- Added subscript and superscript formatting codes
 - **Added the ability to find paths to one of multiple goals using AStar**
 
 Improvements
diff --git a/Demos/TextFormattingDemo.cs b/Demos/TextFormattingDemo.cs
index 3d93262..312d4e9 100644
--- a/Demos/TextFormattingDemo.cs
+++ b/Demos/TextFormattingDemo.cs
@@ -18,7 +18,7 @@ namespace Demos {
             "You can write in <b>bold</i>, <i>italics</i>, <u>with an underline</u>, <st>strikethrough</st>, with a <s #000000 4>drop shadow</s> whose <s #ff0000 4>color</s> and <s #000000 10>offset</s> you can modify in each application of the code, or with various types of <b>combined <c Pink>formatting</c> codes</b>.\n\n" +
             "You can apply <c CornflowerBlue>custom</c> <c Yellow>colors</c> to text, including all default <c Orange>MonoGame colors</c> and <c #aabb00>inline custom colors</c>.\n\n" +
             "You can also use animations like <a wobbly>a wobbly one</a>, as well as create custom ones using the <a wobbly>Code class</a>.\n\n" +
-            "You can also display <i grass> icons in your text!\n\n" +
+            "You can also display <i grass> icons in your text, and use super<sup>script</sup> or sub<sub>script</sub> formatting!\n\n" +
             "Additionally, the text formatter has various methods for interacting with the text, like custom behaviors when hovering over certain parts, and more.";
         private const float Scale = 0.5F;
         private const float Width = 0.9F;
diff --git a/MLEM/Formatting/Codes/SubSupCode.cs b/MLEM/Formatting/Codes/SubSupCode.cs
new file mode 100644
index 0000000..a39f4a4
--- /dev/null
+++ b/MLEM/Formatting/Codes/SubSupCode.cs
@@ -0,0 +1,24 @@
+using System.Text.RegularExpressions;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using MLEM.Font;
+
+namespace MLEM.Formatting.Codes {
+    /// <inheritdoc />
+    public class SubSupCode : Code {
+
+        private readonly float offset;
+
+        /// <inheritdoc />
+        public SubSupCode(Match match, Regex regex, float offset) : base(match, regex) {
+            this.offset = offset;
+        }
+
+        /// <inheritdoc />
+        public override bool DrawCharacter(GameTime time, SpriteBatch batch, int codePoint, string character, Token token, int indexInToken, ref Vector2 pos, GenericFont font, ref Color color, ref float scale, float depth) {
+            pos.Y += this.offset * font.LineHeight * scale;
+            return false;
+        }
+
+    }
+}
diff --git a/MLEM/Formatting/TextFormatter.cs b/MLEM/Formatting/TextFormatter.cs
index d4589fa..0bfd263 100644
--- a/MLEM/Formatting/TextFormatter.cs
+++ b/MLEM/Formatting/TextFormatter.cs
@@ -58,6 +58,12 @@ namespace MLEM.Formatting {
             // control codes
             this.Codes.Add(new Regex(@"</(\w+)>"), (f, m, r) => new SimpleEndCode(m, r, m.Groups[1].Value));
 
+            // superscript and subscript codes
+           this.Codes.Add(new Regex(@"<sub(?: ([+-.0-9]+))?>"), (f, m, r) => new SubSupCode(m, r,
+                float.TryParse(m.Groups[1].Value, NumberStyles.Number, CultureInfo.InvariantCulture, out var off) ? off : 0.15F));
+           this.Codes.Add(new Regex(@"<sup(?: ([+-.0-9]+))?>"), (f, m, r) => new SubSupCode(m, r,
+               float.TryParse(m.Groups[1].Value, NumberStyles.Number, CultureInfo.InvariantCulture, out var off) ? -off : -0.25F));
+
             // macros
             this.Macros.Add(new Regex("~"), (f, m, r) => GenericFont.Nbsp.ToString());
             this.Macros.Add(new Regex("<n>"), (f, m, r) => '\n'.ToString());