Placeholder.java

package me.gepron1x.decaliumcore;

import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.TextReplacementConfig;
import org.bukkit.Bukkit;
import org.bukkit.entity.Player;

import java.util.HashSet;
import java.util.Set;
import java.util.function.Function;

public class Placeholder {
    private static Set<Placeholder> placeholders = new HashSet<>();

    private final String name;
    private final Function<Player, String> placeholderFunction;

    private Placeholder(String name, Function<Player, String> placeholderFunction) {
        this.name = name;
        this.placeholderFunction = placeholderFunction;
    }
    public static void registerPlaceholder(String name, Function<Player, String> replaceFunction) {
        placeholders.add(new Placeholder(name, replaceFunction));
    }
    public static Component applyPlaceholders(Player p, Component component) {
        TextReplacementConfig.Builder builder = TextReplacementConfig.builder();

        for (Placeholder placeholder : placeholders) {
               component = component.replaceText
                        (
                        builder.match("%" + placeholder.name + "%")
                                .replacement(placeholder.placeholderFunction.apply(p))

      .build()
                        );
        }
        return component;
    }
    public static String applyPlaceholders(Player p, String s) {
        for(Placeholder placeholder : placeholders) {
            s = s.replace("%" + placeholder.name + "%", placeholder.placeholderFunction.apply(p));
        }
        return s;
    }
}