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Add abstract declare commands handler

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KennyTV 2021-02-05 11:41:21 +01:00
parent 59e05e3096
commit 54488341bf
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1 changed files with 84 additions and 0 deletions
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common/src/main/java/us/myles/ViaVersion/api/rewriters/CommandRewriter.java Normal file
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package us.myles.ViaVersion.api.rewriters;
import org.jetbrains.annotations.Nullable;
import us.myles.ViaVersion.api.PacketWrapper;
import us.myles.ViaVersion.api.protocol.ClientboundPacketType;
import us.myles.ViaVersion.api.protocol.Protocol;
import us.myles.ViaVersion.api.remapper.PacketRemapper;
import us.myles.ViaVersion.api.type.Type;
import java.util.HashMap;
import java.util.Map;
/**
* Abstract rewriter for the declare commands packet to handle argument type name and content changes.
*/
public abstract class CommandRewriter {
protected final Protocol protocol;
protected final Map<String, CommandArgumentConsumer> parserHandlers = new HashMap<>();
protected CommandRewriter(Protocol protocol) {
this.protocol = protocol;
}
public void handleArgument(PacketWrapper wrapper, String argumentType) throws Exception {
CommandArgumentConsumer handler = parserHandlers.get(argumentType);
if (handler != null) {
handler.accept(wrapper);
}
}
public void registerDeclareCommands(ClientboundPacketType packetType) {
protocol.registerOutgoing(packetType, new PacketRemapper() {
@Override
public void registerMap() {
handler(wrapper -> {
int size = wrapper.passthrough(Type.VAR_INT);
for (int i = 0; i < size; i++) {
byte flags = wrapper.passthrough(Type.BYTE);
wrapper.passthrough(Type.VAR_INT_ARRAY_PRIMITIVE); // Children indices
if ((flags & 0x08) != 0) {
wrapper.passthrough(Type.VAR_INT); // Redirect node index
}
byte nodeType = (byte) (flags & 0x03);
if (nodeType == 1 || nodeType == 2) { // Literal/argument node
wrapper.passthrough(Type.STRING); // Name
}
if (nodeType == 2) { // Argument node
String argumentType = handleArgumentType(wrapper.read(Type.STRING));
if (argumentType != null) {
wrapper.write(Type.STRING, argumentType);
handleArgument(wrapper, argumentType);
}
}
if ((flags & 0x10) != 0) {
wrapper.passthrough(Type.STRING); // Suggestion type
}
}
wrapper.passthrough(Type.VAR_INT); // Root node index
});
}
});
}
/**
* Can be overridden if needed.
*
* @param argumentType argument type
* @return new argument type, or null if it should be removed
*/
@Nullable
protected String handleArgumentType(String argumentType) {
return argumentType;
}
@FunctionalInterface
public interface CommandArgumentConsumer {
void accept(PacketWrapper wrapper) throws Exception;
}
}