Add Language API (#1142)

Author: MelnCat

patches/api/0054-Language-API.patch

@@ -0,0 +1,72 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: MelnCat <melncatuwu@gmail.com>
+Date: Sat, 1 Oct 2022 17:08:23 -0700
+Subject: [PATCH] Language API
+
+
+diff --git a/src/main/java/org/purpurmc/purpur/language/Language.java b/src/main/java/org/purpurmc/purpur/language/Language.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..38483d908ed830e97883733bee2370f87060f4c7
+--- /dev/null
++++ b/src/main/java/org/purpurmc/purpur/language/Language.java
+@@ -0,0 +1,60 @@
++package org.purpurmc.purpur.language;
++
++import net.kyori.adventure.translation.Translatable;
++import org.jetbrains.annotations.NotNull;
++
++/**
++ * Represents a language that can translate translation keys
++ */
++public abstract class Language {
++    private static Language language;
++
++    /**
++     * Returns the default language of the server
++     */
++    @NotNull
++    public static Language getLanguage() {
++        return language;
++    }
++
++    public static void setLanguage(@NotNull Language language) {
++        if (Language.language != null) {
++            throw new UnsupportedOperationException("Cannot redefine singleton Language");
++        }
++        Language.language = language;
++    }
++
++    /**
++     * Checks if a certain translation key is translatable with this language
++     * @param key The translation key
++     * @return Whether this language can translate the key
++     */
++    abstract public boolean has(@NotNull String key);
++
++    /**
++     * Checks if a certain translation key is translatable with this language
++     * @param key The translation key
++     * @return Whether this language can translate the key
++     */
++    public boolean has(@NotNull Translatable key) {
++        return has(key.translationKey());
++    }
++
++    /**
++     * Translates a translation key to this language
++     * @param key The translation key
++     * @return The translated key, or the translation key if it couldn't be translated
++     */
++    @NotNull
++    abstract public String getOrDefault(@NotNull String key);
++
++    /**
++     * Translates a translation key to this language
++     * @param key The translation key
++     * @return The translated key, or the translation key if it couldn't be translated
++     */
++    @NotNull
++    public String getOrDefault(@NotNull Translatable key) {
++        return getOrDefault(key.translationKey());
++    }
++}

patches/server/0308-Language-API.patch

@@ -0,0 +1,39 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: MelnCat <melncatuwu@gmail.com>
+Date: Sat, 1 Oct 2022 17:08:43 -0700
+Subject: [PATCH] Language API
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+index e9c20441e37db68d500c230a4371610f98c69428..f9508a26b2e764e752da3d2c9f43a9d7de19dd27 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+@@ -238,6 +238,7 @@ import org.bukkit.scoreboard.Criteria;
+ import org.bukkit.structure.StructureManager;
+ import org.bukkit.util.StringUtil;
+ import org.bukkit.util.permissions.DefaultPermissions;
++import org.jetbrains.annotations.NotNull;
+ import org.yaml.snakeyaml.Yaml;
+ import org.yaml.snakeyaml.constructor.SafeConstructor;
+ import org.yaml.snakeyaml.error.MarkedYAMLException;
+@@ -307,6 +308,20 @@ public final class CraftServer implements Server {
+         this.structureManager = new CraftStructureManager(console.getStructureManager());
+ 
+         Bukkit.setServer(this);
++        // Purpur start
++        org.purpurmc.purpur.language.Language.setLanguage(new org.purpurmc.purpur.language.Language() {
++            private net.minecraft.locale.Language language = net.minecraft.locale.Language.getInstance();
++            @Override
++            public boolean has(@NotNull String key) {
++                return language.has(key);
++            }
++
++            @Override
++            public @NotNull String getOrDefault(@NotNull String key) {
++                return language.getOrDefault(key);
++            }
++        });
++        // Purpur end
+ 
+         // Register all the Enchantments and PotionTypes now so we can stop new registration immediately after
+         Enchantments.SHARPNESS.getClass();