From 6d9d3734adeb29e55c3b0c7ca591bc9ce3240567 Mon Sep 17 00:00:00 2001
From: Alex 'mcmonkey' Goodwin <agoodwin@freneticllc.com>
Date: Fri, 16 Apr 2021 15:11:14 -0700
Subject: [PATCH] PlayerTag.revoke_advancement

---
 .../denizen/objects/PlayerTag.java            | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/plugin/src/main/java/com/denizenscript/denizen/objects/PlayerTag.java b/plugin/src/main/java/com/denizenscript/denizen/objects/PlayerTag.java
index 524b8e3b0e..c7a36e4491 100644
--- a/plugin/src/main/java/com/denizenscript/denizen/objects/PlayerTag.java
+++ b/plugin/src/main/java/com/denizenscript/denizen/objects/PlayerTag.java
@@ -2513,6 +2513,29 @@ public void adjust(Mechanism mechanism) {
             }
         }
 
+        // <--[mechanism]
+        // @object PlayerTag
+        // @name revoke_advancement
+        // @input ElementTag
+        // @description
+        // Un-awards an advancement from the player.
+        // @tags
+        // <PlayerTag.has_advancement[<name>]>
+        // -->
+        if (mechanism.matches("revoke_advancement")) {
+            Advancement adv = AdvancementHelper.getAdvancement(mechanism.getValue().asString());
+            if (adv == null) {
+                if (mechanism.shouldDebug()) {
+                    Debug.echoError("Advancement '" + mechanism.getValue().asString() + "' does not exist.");
+                }
+                return;
+            }
+            AdvancementProgress prog = getPlayerEntity().getAdvancementProgress(adv);
+            for (String criteria : prog.getRemainingCriteria()) {
+                prog.revokeCriteria(criteria);
+            }
+        }
+
         // <--[mechanism]
         // @object PlayerTag
         // @name fake_absorption_health