From: Marc-André Lureau <marcandre.lureau@redhat.com>

Introduce IfNot predicate class, for 'not' condition expressions.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 scripts/qapi/common.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/scripts/qapi/common.py b/scripts/qapi/common.py
index 8dc2824186..4d8579280e 100644
--- a/scripts/qapi/common.py
+++ b/scripts/qapi/common.py
@@ -215,6 +215,25 @@ class IfOption(IfPredicate):
         return self.option == other.option
 
 
+class IfNot(IfPredicate):
+    def __init__(self, pred: IfPredicate):
+        self.pred = pred
+
+    def cgen(self) -> str:
+        return "!" + self.pred.cgen()
+
+    def __bool__(self) -> bool:
+        return bool(self.pred)
+
+    def __repr__(self) -> str:
+        return f"IfNot({self.pred!r})"
+
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, type(self)):
+            return False
+        return self.pred == other.pred
+
+
 class IfPredicateList(IfPredicate):
     C_OP = ""
 
-- 
2.29.0