#2342: Add score and selector components to chat API

api/src/main/java/net/md_5/bungee/api/connection/ProxiedPlayer.java

@@ -10,6 +10,7 @@ import net.md_5.bungee.api.SkinConfiguration;
 import net.md_5.bungee.api.Title;
 import net.md_5.bungee.api.chat.BaseComponent;
 import net.md_5.bungee.api.config.ServerInfo;
+import net.md_5.bungee.api.score.Scoreboard;
 
 /**
  * Represents a player who's connection is being connected to somewhere else,
@@ -275,4 +276,11 @@ public interface ProxiedPlayer extends Connection, CommandSender
      * not occurred for this {@link ProxiedPlayer} yet.
      */
     Map<String, String> getModList();
+
+    /**
+     * Get the {@link Scoreboard} that belongs to this player.
+     *
+     * @return this player's {@link Scoreboard}
+     */
+    Scoreboard getScoreboard();
 }

api/src/main/java/net/md_5/bungee/api/score/Scoreboard.java

@@ -62,6 +62,11 @@ public class Scoreboard
         scores.put( score.getItemName(), score );
     }
 
+    public Score getScore(String name)
+    {
+        return scores.get( name );
+    }
+
     public void addTeam(Team team)
     {
         Preconditions.checkNotNull( team, "team" );

chat/src/main/java/net/md_5/bungee/api/chat/KeybindComponent.java

@@ -35,7 +35,7 @@ public final class KeybindComponent extends BaseComponent
      * Creates a keybind component with the passed internal keybind value.
      *
      * @param keybind the keybind value
-     * @see Keybind
+     * @see Keybinds
      */
     public KeybindComponent(String keybind)
     {

chat/src/main/java/net/md_5/bungee/api/chat/ScoreComponent.java

@@ -0,0 +1,97 @@
+package net.md_5.bungee.api.chat;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+/**
+ * This component displays the score based on a player score on the scoreboard.
+ * <br>
+ * The <b>name</b> is the name of the player stored on the scoreboard, which may
+ * be a "fake" player. It can also be a target selector that <b>must</b> resolve
+ * to 1 target, and may target non-player entities.
+ * <br>
+ * With a book, /tellraw, or /title, using the wildcard '*' in the place of a
+ * name or target selector will cause all players to see their own score in the
+ * specified objective.
+ * <br>
+ * <b>Signs cannot use the '*' wildcard</b>
+ * <br>
+ * These values are filled in by the server-side implementation.
+ * <br>
+ * As of 1.12.2, a bug ( MC-56373 ) prevents full usage within hover events.
+ */
+@Getter
+@Setter
+@ToString
+@AllArgsConstructor
+public final class ScoreComponent extends BaseComponent
+{
+
+    /**
+     * The name of the entity whose score should be displayed.
+     */
+    private String name;
+
+    /**
+     * The internal name of the objective the score is attached to.
+     */
+    private String objective;
+
+    /**
+     * The optional value to use instead of the one present in the Scoreboard.
+     */
+    private String value = "";
+
+    /**
+     * Creates a new score component with the specified name and objective.<br>
+     * If not specifically set, value will default to an empty string;
+     * signifying that the scoreboard value should take precedence. If not null,
+     * nor empty, {@code value} will override any value found in the
+     * scoreboard.<br>
+     * The value defaults to an empty string.
+     *
+     * @param name the name of the entity, or an entity selector, whose score
+     * should be displayed
+     * @param objective the internal name of the objective the entity's score is
+     * attached to
+     */
+    public ScoreComponent(String name, String objective)
+    {
+        setName( name );
+        setObjective( objective );
+    }
+
+    /**
+     * Creates a score component from the original to clone it.
+     *
+     * @param original the original for the new score component
+     */
+    public ScoreComponent(ScoreComponent original)
+    {
+        super( original );
+        setName( original.getName() );
+        setObjective( original.getObjective() );
+        setValue( original.getValue() );
+    }
+
+    @Override
+    public ScoreComponent duplicate()
+    {
+        return new ScoreComponent( this );
+    }
+
+    @Override
+    public ScoreComponent duplicateWithoutFormatting()
+    {
+        return new ScoreComponent( this.name, this.objective, this.value );
+    }
+
+    @Override
+    protected void toLegacyText(StringBuilder builder)
+    {
+        builder.append( this.value );
+        super.toLegacyText( builder );
+    }
+}

chat/src/main/java/net/md_5/bungee/api/chat/SelectorComponent.java

@@ -0,0 +1,63 @@
+package net.md_5.bungee.api.chat;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+/**
+ * This component processes a target selector into a pre-formatted set of
+ * discovered names.
+ * <br>
+ * Multiple targets may be obtained, and with commas separating each one and a
+ * final "and" for the last target. The resulting format cannot be overwritten.
+ * This includes all styling from team prefixes, insertions, click events, and
+ * hover events.
+ * <br>
+ * These values are filled in by the server-side implementation.
+ * <br>
+ * As of 1.12.2, a bug ( MC-56373 ) prevents full usage within hover events.
+ */
+@Getter
+@Setter
+@ToString
+@AllArgsConstructor
+public final class SelectorComponent extends BaseComponent
+{
+
+    /**
+     * An entity target selector (@p, @a, @r, @e, or @s) and, optionally,
+     * selector arguments (e.g. @e[r=10,type=Creeper]).
+     */
+    private String selector;
+
+    /**
+     * Creates a selector component from the original to clone it.
+     *
+     * @param original the original for the new selector component
+     */
+    public SelectorComponent(SelectorComponent original)
+    {
+        super( original );
+        setSelector( original.getSelector() );
+    }
+
+    @Override
+    public SelectorComponent duplicate()
+    {
+        return new SelectorComponent( this );
+    }
+
+    @Override
+    public SelectorComponent duplicateWithoutFormatting()
+    {
+        return new SelectorComponent( this.selector );
+    }
+
+    @Override
+    protected void toLegacyText(StringBuilder builder)
+    {
+        builder.append( this.selector );
+        super.toLegacyText( builder );
+    }
+}

chat/src/main/java/net/md_5/bungee/chat/ComponentSerializer.java

@@ -9,6 +9,8 @@ import com.google.gson.JsonObject;
 import com.google.gson.JsonParseException;
 import net.md_5.bungee.api.chat.BaseComponent;
 import net.md_5.bungee.api.chat.KeybindComponent;
+import net.md_5.bungee.api.chat.ScoreComponent;
+import net.md_5.bungee.api.chat.SelectorComponent;
 import net.md_5.bungee.api.chat.TextComponent;
 import net.md_5.bungee.api.chat.TranslatableComponent;
 
@@ -23,6 +25,8 @@ public class ComponentSerializer implements JsonDeserializer<BaseComponent>
             registerTypeAdapter( TextComponent.class, new TextComponentSerializer() ).
             registerTypeAdapter( TranslatableComponent.class, new TranslatableComponentSerializer() ).
             registerTypeAdapter( KeybindComponent.class, new KeybindComponentSerializer() ).
+            registerTypeAdapter( ScoreComponent.class, new ScoreComponentSerializer() ).
+            registerTypeAdapter( SelectorComponent.class, new SelectorComponentSerializer() ).
             create();
 
     public final static ThreadLocal<HashSet<BaseComponent>> serializedComponents = new ThreadLocal<HashSet<BaseComponent>>();
@@ -65,6 +69,14 @@ public class ComponentSerializer implements JsonDeserializer<BaseComponent>
         {
             return context.deserialize( json, KeybindComponent.class );
         }
+        if ( object.has( "score" ) )
+        {
+            return context.deserialize( json, ScoreComponent.class );
+        }
+        if ( object.has( "selector" ) )
+        {
+            return context.deserialize( json, SelectorComponent.class );
+        }
         return context.deserialize( json, TextComponent.class );
     }
 }

chat/src/main/java/net/md_5/bungee/chat/ScoreComponentSerializer.java

@@ -0,0 +1,49 @@
+package net.md_5.bungee.chat;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import java.lang.reflect.Type;
+import net.md_5.bungee.api.chat.ScoreComponent;
+
+public class ScoreComponentSerializer extends BaseComponentSerializer implements JsonSerializer<ScoreComponent>, JsonDeserializer<ScoreComponent>
+{
+
+    @Override
+    public ScoreComponent deserialize(JsonElement element, Type type, JsonDeserializationContext context) throws JsonParseException
+    {
+        JsonObject json = element.getAsJsonObject();
+        if ( !json.has( "name" ) || !json.has( "objective" ) )
+        {
+            throw new JsonParseException( "A score component needs at least a name and an objective" );
+        }
+
+        String name = json.get( "name" ).getAsString();
+        String objective = json.get( "objective" ).getAsString();
+        ScoreComponent component = new ScoreComponent( name, objective );
+        if ( json.has( "value" ) && !json.get( "value" ).getAsString().isEmpty() )
+        {
+            component.setValue( json.get( "value" ).getAsString() );
+        }
+
+        deserialize( json, component, context );
+        return component;
+    }
+
+    @Override
+    public JsonElement serialize(ScoreComponent component, Type type, JsonSerializationContext context)
+    {
+        JsonObject root = new JsonObject();
+        serialize( root, component, context );
+        JsonObject json = new JsonObject();
+        json.addProperty( "name", component.getName() );
+        json.addProperty( "objective", component.getObjective() );
+        json.addProperty( "value", component.getValue() );
+        root.add( "score", json );
+        return root;
+    }
+}

chat/src/main/java/net/md_5/bungee/chat/SelectorComponentSerializer.java

@@ -0,0 +1,33 @@
+package net.md_5.bungee.chat;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import java.lang.reflect.Type;
+import net.md_5.bungee.api.chat.SelectorComponent;
+
+public class SelectorComponentSerializer extends BaseComponentSerializer implements JsonSerializer<SelectorComponent>, JsonDeserializer<SelectorComponent>
+{
+
+    @Override
+    public SelectorComponent deserialize(JsonElement element, Type type, JsonDeserializationContext context) throws JsonParseException
+    {
+        JsonObject object = element.getAsJsonObject();
+        SelectorComponent component = new SelectorComponent( object.get( "selector" ).getAsString() );
+        deserialize( object, component, context );
+        return component;
+    }
+
+    @Override
+    public JsonElement serialize(SelectorComponent component, Type type, JsonSerializationContext context)
+    {
+        JsonObject object = new JsonObject();
+        serialize( object, component, context );
+        object.addProperty( "selector", component.getSelector() );
+        return object;
+    }
+}

proxy/src/main/java/net/md_5/bungee/BungeeCord.java

@@ -55,6 +55,9 @@ import net.md_5.bungee.api.ReconnectHandler;
 import net.md_5.bungee.api.ServerPing;
 import net.md_5.bungee.api.Title;
 import net.md_5.bungee.api.chat.BaseComponent;
+import net.md_5.bungee.api.chat.KeybindComponent;
+import net.md_5.bungee.api.chat.ScoreComponent;
+import net.md_5.bungee.api.chat.SelectorComponent;
 import net.md_5.bungee.api.chat.TextComponent;
 import net.md_5.bungee.api.chat.TranslatableComponent;
 import net.md_5.bungee.api.config.ConfigurationAdapter;
@@ -64,6 +67,9 @@ import net.md_5.bungee.api.connection.ProxiedPlayer;
 import net.md_5.bungee.api.plugin.Plugin;
 import net.md_5.bungee.api.plugin.PluginManager;
 import net.md_5.bungee.chat.ComponentSerializer;
+import net.md_5.bungee.chat.KeybindComponentSerializer;
+import net.md_5.bungee.chat.ScoreComponentSerializer;
+import net.md_5.bungee.chat.SelectorComponentSerializer;
 import net.md_5.bungee.chat.TextComponentSerializer;
 import net.md_5.bungee.chat.TranslatableComponentSerializer;
 import net.md_5.bungee.command.CommandBungee;
@@ -152,6 +158,9 @@ public class BungeeCord extends ProxyServer
             .registerTypeAdapter( BaseComponent.class, new ComponentSerializer() )
             .registerTypeAdapter( TextComponent.class, new TextComponentSerializer() )
             .registerTypeAdapter( TranslatableComponent.class, new TranslatableComponentSerializer() )
+            .registerTypeAdapter( KeybindComponent.class, new KeybindComponentSerializer() )
+            .registerTypeAdapter( ScoreComponent.class, new ScoreComponentSerializer() )
+            .registerTypeAdapter( SelectorComponent.class, new SelectorComponentSerializer() )
             .registerTypeAdapter( ServerPing.PlayerInfo.class, new PlayerInfoSerializer() )
             .registerTypeAdapter( Favicon.class, Favicon.getFaviconTypeAdapter() ).create();
     @Getter

proxy/src/main/java/net/md_5/bungee/UserConnection.java

@@ -61,6 +61,7 @@ import net.md_5.bungee.protocol.packet.SetCompression;
 import net.md_5.bungee.tab.ServerUnique;
 import net.md_5.bungee.tab.TabList;
 import net.md_5.bungee.util.CaseInsensitiveSet;
+import net.md_5.bungee.util.ChatComponentTransformer;
 
 @RequiredArgsConstructor
 public final class UserConnection implements ProxiedPlayer
@@ -404,6 +405,9 @@ public final class UserConnection implements ProxiedPlayer
     @Override
     public void sendMessage(ChatMessageType position, BaseComponent... message)
     {
+        // transform score components
+        message = ChatComponentTransformer.getInstance().transform( this, message );
+
         // Action bar doesn't display the new JSON formattings, legacy works - send it using this for now
         if ( position == ChatMessageType.ACTION_BAR )
         {
@@ -417,6 +421,8 @@ public final class UserConnection implements ProxiedPlayer
     @Override
     public void sendMessage(ChatMessageType position, BaseComponent message)
     {
+        message = ChatComponentTransformer.getInstance().transform( this, message )[0];
+
         // Action bar doesn't display the new JSON formattings, legacy works - send it using this for now
         if ( position == ChatMessageType.ACTION_BAR )
         {
@@ -594,23 +600,27 @@ public final class UserConnection implements ProxiedPlayer
         return ImmutableMap.copyOf( forgeClientHandler.getClientModList() );
     }
 
-    private static final String EMPTY_TEXT = ComponentSerializer.toString( new TextComponent( "" ) );
-
     @Override
     public void setTabHeader(BaseComponent header, BaseComponent footer)
     {
+        header = ChatComponentTransformer.getInstance().transform( this, header )[0];
+        footer = ChatComponentTransformer.getInstance().transform( this, footer )[0];
+
         unsafe().sendPacket( new PlayerListHeaderFooter(
-                ( header != null ) ? ComponentSerializer.toString( header ) : EMPTY_TEXT,
-                ( footer != null ) ? ComponentSerializer.toString( footer ) : EMPTY_TEXT
+                ComponentSerializer.toString( header ),
+                ComponentSerializer.toString( footer )
         ) );
     }
 
     @Override
     public void setTabHeader(BaseComponent[] header, BaseComponent[] footer)
     {
+        header = ChatComponentTransformer.getInstance().transform( this, header );
+        footer = ChatComponentTransformer.getInstance().transform( this, footer );
+
         unsafe().sendPacket( new PlayerListHeaderFooter(
-                ( header != null ) ? ComponentSerializer.toString( header ) : EMPTY_TEXT,
-                ( footer != null ) ? ComponentSerializer.toString( footer ) : EMPTY_TEXT
+                ComponentSerializer.toString( header ),
+                ComponentSerializer.toString( footer )
         ) );
     }
 
@@ -647,4 +657,10 @@ public final class UserConnection implements ProxiedPlayer
     {
         return !ch.isClosed();
     }
+
+    @Override
+    public Scoreboard getScoreboard()
+    {
+        return serverSentScoreboard;
+    }
 }

proxy/src/main/java/net/md_5/bungee/util/ChatComponentTransformer.java

@@ -0,0 +1,121 @@
+package net.md_5.bungee.util;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
+import java.util.List;
+import java.util.regex.Pattern;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import net.md_5.bungee.api.chat.BaseComponent;
+import net.md_5.bungee.api.chat.ScoreComponent;
+import net.md_5.bungee.api.chat.TextComponent;
+import net.md_5.bungee.api.connection.ProxiedPlayer;
+import net.md_5.bungee.api.score.Score;
+
+/**
+ * This class transforms chat components by attempting to replace transformable
+ * fields with the appropriate value.
+ * <br>
+ * ScoreComponents are transformed by replacing their
+ * {@link ScoreComponent#getName()}} into the matching entity's name as well as
+ * replacing the {@link ScoreComponent#getValue()} with the matching value in
+ * the {@link net.md_5.bungee.api.score.Scoreboard} if and only if the
+ * {@link ScoreComponent#getValue()} is not present.
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public final class ChatComponentTransformer
+{
+
+    private static final ChatComponentTransformer INSTANCE = new ChatComponentTransformer();
+    /**
+     * The Pattern to match entity selectors.
+     */
+    private static final Pattern SELECTOR_PATTERN = Pattern.compile( "^@([pares])(?:\\[([^ ]*)\\])?$" );
+
+    public static ChatComponentTransformer getInstance()
+    {
+        return INSTANCE;
+    }
+
+    /**
+     * Transform a set of components, and attempt to transform the transformable
+     * fields. Entity selectors <b>cannot</b> be evaluated. This will
+     * recursively search for all extra components (see
+     * {@link BaseComponent#getExtra()}).
+     *
+     * @param player player
+     * @param component the component to transform
+     * @return the transformed component, or an array containing a single empty
+     * TextComponent if the components are null or empty
+     * @throws IllegalArgumentException if an entity selector pattern is present
+     */
+    public BaseComponent[] transform(ProxiedPlayer player, BaseComponent... component)
+    {
+        if ( component == null || component.length < 1 )
+        {
+            return new BaseComponent[]
+            {
+                new TextComponent( "" )
+            };
+        }
+
+        for ( BaseComponent root : component )
+        {
+            if ( root.getExtra() != null && !root.getExtra().isEmpty() )
+            {
+                List<BaseComponent> list = Lists.newArrayList( transform( player, root.getExtra().toArray( new BaseComponent[ root.getExtra().size() ] ) ) );
+                root.setExtra( list );
+            }
+
+            if ( root instanceof ScoreComponent )
+            {
+                transformScoreComponent( player, (ScoreComponent) root );
+            }
+        }
+        return component;
+    }
+
+    /**
+     * Transform a ScoreComponent by replacing the name and value with the
+     * appropriate values.
+     *
+     * @param component the component to transform
+     * @param scoreboard the scoreboard to retrieve scores from
+     * @param player the player to use for the component's name
+     */
+    private void transformScoreComponent(ProxiedPlayer player, ScoreComponent component)
+    {
+        Preconditions.checkArgument( !isSelectorPattern( component.getName() ), "Cannot transform entity selector patterns" );
+
+        if ( component.getValue() != null && !component.getValue().isEmpty() )
+        {
+            return; // pre-defined values override scoreboard values
+        }
+
+        // check for '*' wildcard
+        if ( component.getName().equals( "*" ) )
+        {
+            component.setName( player.getName() );
+        }
+
+        if ( player.getScoreboard().getObjective( component.getObjective() ) != null )
+        {
+            Score score = player.getScoreboard().getScore( component.getName() );
+            if ( score != null )
+            {
+                component.setValue( Integer.toString( score.getValue() ) );
+            }
+        }
+    }
+
+    /**
+     * Checks if the given string is an entity selector.
+     *
+     * @param pattern the pattern to check
+     * @return true if it is an entity selector
+     */
+    public boolean isSelectorPattern(String pattern)
+    {
+        return SELECTOR_PATTERN.matcher( pattern ).matches();
+    }
+}