Add extra safety hook

Author: wooorm

lib/util/safe.js

@@ -31,7 +31,10 @@ function safe(context, input, config) {
   while (++index < length) {
     pattern = patterns[index]
 
-    if (!inScope(context.stack, pattern.inConstruct)) {
+    if (
+      !inScope(context.stack, pattern.inConstruct, true) ||
+      inScope(context.stack, pattern.notInConstruct)
+    ) {
       continue
     }
 
@@ -89,12 +92,12 @@ function safe(context, input, config) {
   return result.join('')
 }
 
-function inScope(stack, list) {
+function inScope(stack, list, none) {
   var length
   var index
 
   if (!list) {
-    return true
+    return none
   }
 
   if (typeof list === 'string') {