Fix nested #if <ndef> condition

boriel · boriel · commit 123ee30bedec · 2020-05-27T01:05:41.000+02:00
diff --git a/tests/functional/prepro94.bi b/tests/functional/prepro94.bi
@@ -0,0 +1,9 @@
+
+
+#ifdef MACRO
+#  ifndef ANOTHER_MACRO
+#    error This should not happen
+#  endif
+#else
+  OK
+#endif
diff --git a/tests/functional/prepro94.out b/tests/functional/prepro94.out
@@ -0,0 +1,4 @@
+#line 1 "prepro94.bi"
+#line 8 "prepro94.bi"
+  OK
+#line 10 "prepro94.bi"
diff --git a/zxbpp/zxbpp.py b/zxbpp/zxbpp.py
@@ -543,7 +543,8 @@ def p_ifn_header(p):
     global ENABLED
 
     IFDEFS.append((ENABLED, p.lineno(2)))
-    ENABLED = not ID_TABLE.defined(p[2])
+    if ENABLED:
+        ENABLED = not ID_TABLE.defined(p[2])
 
 
 def p_if_expr_header(p):
