Utilities for Minecraft color codes translation

misc/src/main/java/org/zhdev/util/ColorUtils.java

@@ -0,0 +1,47 @@
+package org.zhdev.util;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class ColorUtils {
+    public static final char COLOR_CHAR = '§';
+
+    public static void translateAlternateColorCodes(StringBuilder builder, char replaceChar) {
+        Matcher m = Pattern.compile(Pattern.quote(String.valueOf(replaceChar)) + "(#[0-9a-fA-F]{6})").matcher(builder);
+        int start = 0;
+        while (m.find(start)) {
+            String hex = m.group(1);
+            StringBuilder replaceBuilder = new StringBuilder().append(COLOR_CHAR).append('x');
+            for (int i = 0; i < hex.length(); i++) {
+                char c = hex.charAt(i);
+                replaceBuilder.append(COLOR_CHAR).append(c);
+            }
+            builder.replace(m.start(), m.end(), replaceBuilder.toString());
+            start = m.start() + replaceBuilder.length();
+        }
+
+        String chars = "0123456789AaBbCcDdEeFfKkLlMmNnOoRrXx";
+        for (int i = 0; i < builder.length() - 1; ++i) {
+            if (builder.charAt(i) == replaceChar && chars.indexOf(builder.charAt(i + 1)) > -1) {
+                builder.setCharAt(i, COLOR_CHAR);
+                builder.setCharAt(i + 1, Character.toLowerCase(builder.charAt(i + 1)));
+            }
+        }
+    }
+
+    public static String translateAlternateColorCodes(String str, char replaceChar) {
+        StringBuilder builder = new StringBuilder(str);
+        translateAlternateColorCodes(builder, replaceChar);
+        return builder.toString();
+    }
+
+    public static void translateAlternateColorCodes(StringBuilder str) {
+        translateAlternateColorCodes(str, '&');
+    }
+
+    public static String translateAlternateColorCodes(String str) {
+        StringBuilder builder = new StringBuilder(str);
+        translateAlternateColorCodes(builder, '&');
+        return builder.toString();
+    }
+}