fix crashes

closes sk22#393
closes sk22#394

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

@@ -7,6 +7,7 @@ import android.content.res.Resources;
 import android.os.Build;
 import android.os.LocaleList;
 
+import org.joinmastodon.android.GlobalUserPreferences;
 import org.joinmastodon.android.model.Instance;
 
 import java.util.ArrayList;

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

@@ -0,0 +1,53 @@
+package org.joinmastodon.android.utils;
+
+import org.joinmastodon.android.fragments.ComposeFragment;
+
+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 StringEncoder {
+	private final Function<String, String> fn;
+
+	public StringEncoder(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 = ComposeFragment.HIGHLIGHT_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 String decode(String content, Pattern regex) {
+		Matcher m = regex.matcher(content);
+		StringBuilder decodedString = new StringBuilder();
+		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
+			decodedString.append(fn.apply(res.group()));
+		}
+		decodedString.append(content.substring(previousEnd));
+		return decodedString.toString();
+	}
+}