refactor(StatusTextEncoder.java): add back this utility

Why do I still do this aaaaaaaaaaaa

mastodon/src/main/java/org/joinmastodon/android/utils/StatusTextEncoder.java

@@ -0,0 +1,61 @@
+package org.joinmastodon.android.utils;
+
+import android.util.Pair;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Function;
+import java.util.regex.MatchResult;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+// not a good class
+public class StatusTextEncoder {
+	private final Function<String, String> fn;
+
+	// see ComposeFragment.HIGHLIGHT_PATTERN
+	private final static Pattern EXCLUDE_PATTERN = Pattern.compile("\\s*(?:@([a-zA-Z0-9_]+)(@[a-zA-Z0-9_.-]+)?|#([^\\s.]+))\\s*");
+
+	public StatusTextEncoder(Function<String, String> fn) {
+		this.fn = fn;
+	}
+
+	// prettiest method award winner 2023 [citation needed]
+	public String encode(String content) {
+		StringBuilder encodedString = new StringBuilder();
+		// matches mentions and hashtags
+		Matcher m = EXCLUDE_PATTERN.matcher(content);
+		int previousEnd = 0;
+		while (m.find()) {
+			MatchResult res = m.toMatchResult();
+			// everything before the match - do encode
+			encodedString.append(fn.apply(content.substring(previousEnd, res.start())));
+			previousEnd = res.end();
+			// the match - do not encode
+			encodedString.append(res.group());
+		}
+		// everything after the last match - do encode
+		encodedString.append(fn.apply(content.substring(previousEnd)));
+		return encodedString.toString();
+	}
+
+	// prettiest almost-exact replica of a pretty function
+	public Pair<String, List<String>> decode(String content, Pattern regex) {
+		Matcher m=regex.matcher(content);
+		StringBuilder decodedString=new StringBuilder();
+		List<String> decodedParts=new ArrayList<>();
+		int previousEnd=0;
+		while (m.find()) {
+			MatchResult res=m.toMatchResult();
+			// everything before the match - do not decode
+			decodedString.append(content.substring(previousEnd, res.start()));
+			previousEnd=res.end();
+			// the match - do decode
+			String decoded=fn.apply(res.group());
+			decodedParts.add(decoded);
+			decodedString.append(decoded);
+		}
+		decodedString.append(content.substring(previousEnd));
+		return Pair.create(decodedString.toString(), decodedParts);
+	}
+}