From f486d0b9832448a34e201e7bd9e67cfcaf7a4111 Mon Sep 17 00:00:00 2001
From: Azide <rukuy@qq.com>
Date: Sat, 20 Aug 2022 22:33:57 +0800
Subject: [PATCH] =?UTF-8?q?=E5=88=9D=E6=AD=A5=E5=AE=8C=E6=88=90=E5=B1=8F?=
 =?UTF-8?q?=E8=94=BD=E7=89=B9=E5=AE=9Atag=E5=8A=9F=E8=83=BD?=
MIME-Version: 1.0
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---
 .../nonebot_bison/platform/platform.py        | 31 +++++++++++++++----
 1 file changed, 25 insertions(+), 6 deletions(-)

diff --git a/src/plugins/nonebot_bison/platform/platform.py b/src/plugins/nonebot_bison/platform/platform.py
index d0e2cf6..417c9cd 100644
--- a/src/plugins/nonebot_bison/platform/platform.py
+++ b/src/plugins/nonebot_bison/platform/platform.py
@@ -111,6 +111,30 @@ class Platform(metaclass=RegistryABCMeta, base=True):
     def set_stored_data(self, target: Target, data: Any):
         self.store[target] = data
 
+    def tag_separator(self, stored_tags: list[Tag]):
+        subscribed_tags = []
+        banned_tags = []
+        for tag in stored_tags:
+            if tag.startswith("~"):
+                banned_tags.append(tag.lstrip("~"))
+            else:
+                subscribed_tags.append(tag)
+        return subscribed_tags, banned_tags
+
+    def is_banned_post(
+        self,
+        post_tags: Collection[Tag],
+        subscribed_tags: list[Tag],
+        banned_tags: list[Tag],
+    ) -> bool:
+        for tag in post_tags or []:
+            if banned_tags and tag in banned_tags:
+                return True
+            elif subscribed_tags and tag not in subscribed_tags:
+                return True
+
+        return False
+
     async def filter_user_custom(
         self, raw_post_list: list[RawPost], cats: list[Category], tags: list[Tag]
     ) -> list[RawPost]:
@@ -121,13 +145,8 @@ class Platform(metaclass=RegistryABCMeta, base=True):
                 if cats and cat not in cats:
                     continue
             if self.enable_tag and tags:
-                flag = False
                 post_tags = self.get_tags(raw_post)
-                for tag in post_tags or []:
-                    if tag in tags:
-                        flag = True
-                        break
-                if not flag:
+                if self.is_banned_post(post_tags, **self.tag_separator(tags)):
                     continue
             res.append(raw_post)
         return res