Implement number formatting in dynamic translations

Author: booky10

common/src/main/java/dev/booky/cloudcore/i18n/AdvancedTagFormatter.java

@@ -1,6 +1,7 @@
 package dev.booky.cloudcore.i18n;
 // Created by booky10 in CloudCore (17:27 11.05.2024.)
 
+import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TranslationArgument;
 import net.kyori.adventure.text.minimessage.Context;
 import net.kyori.adventure.text.minimessage.ParsingException;
@@ -11,7 +12,11 @@
 import net.kyori.adventure.util.TriState;
 import org.jetbrains.annotations.Nullable;
 
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
+import java.text.NumberFormat;
 import java.util.List;
+import java.util.Locale;
 
 import static net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer.plainText;
 
@@ -49,7 +54,7 @@ public AdvancedTagFormatter(List<TranslationArgument> args) {
         }
         String dynamicFormattingName = args.pop().value();
         DynamicFormatting dynamicFormatting = DynamicFormatting.INDEX.valueOr(
-                dynamicFormattingName, DynamicFormatting.NONE);
+            dynamicFormattingName, DynamicFormatting.NONE);
         return dynamicFormatting.format(args, ctx, arg);
     }
 
@@ -95,11 +100,38 @@ public Tag format(ArgumentQueue args, Context ctx, TranslationArgument arg) {
                 String value;
                 do {
                     value = args.popOr(
-                            () -> "No argument found for " + state).value();
+                        () -> "No argument found for " + state).value();
                 } while (argOffset-- > 0);
                 return Tag.inserting(ctx.deserialize(value));
             }
         },
+        NUMBER("num") {
+            private static NumberFormat getDecimalFormat(ArgumentQueue args) {
+                // copied from Formatter#number
+                if (!args.hasNext()) {
+                    return DecimalFormat.getInstance();
+                }
+
+                String localeStr = args.pop().value();
+                if (args.hasNext()) {
+                    String format = args.pop().value();
+                    Locale locale = Locale.forLanguageTag(localeStr);
+                    DecimalFormatSymbols symbols = new DecimalFormatSymbols(locale);
+                    return new DecimalFormat(format, symbols);
+                }
+
+                return localeStr.indexOf('.') < 0
+                    ? DecimalFormat.getInstance(Locale.forLanguageTag(localeStr))
+                    : new DecimalFormat(localeStr, DecimalFormatSymbols.getInstance());
+            }
+
+            @Override
+            public Tag format(ArgumentQueue args, Context ctx, TranslationArgument arg) {
+                String formatted = getDecimalFormat(args).format(asNumber(arg));
+                Component component = ctx.deserialize(formatted);
+                return Tag.inserting(component);
+            }
+        },
         NONE("none") {
             @Override
             public Tag format(ArgumentQueue args, Context ctx, TranslationArgument arg) {
@@ -108,14 +140,24 @@ public Tag format(ArgumentQueue args, Context ctx, TranslationArgument arg) {
         };
 
         private static final Index<String, DynamicFormatting> INDEX =
-                Index.create(DynamicFormatting::getId, values());
+            Index.create(DynamicFormatting::getId, values());
 
         private final String id;
 
         DynamicFormatting(String id) {
             this.id = id;
         }
 
+        protected static Number asNumber(TranslationArgument arg) {
+            if (arg.value() instanceof Number) {
+                return (Number) arg.value();
+            }
+            String string = arg.value() instanceof Component
+                ? plainText().serialize((Component) arg.value())
+                : String.valueOf(arg.value());
+            return Double.parseDouble(string);
+        }
+
         public abstract Tag format(ArgumentQueue args, Context ctx, TranslationArgument arg);
 
         public String getId() {