From 3b9b111b2fd73aff0b02efd317b84a865fbfac12 Mon Sep 17 00:00:00 2001
From: Martok <martok@martoks-place.de>
Date: Wed, 26 Apr 2023 17:32:55 +0200
Subject: [PATCH] Issue #2142 - Add predicate functions count_if and any_of to
 ListNode iterator

---
 js/src/frontend/ParseNode.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/js/src/frontend/ParseNode.h b/js/src/frontend/ParseNode.h
index 54d2bef108..2f6311eace 100644
--- a/js/src/frontend/ParseNode.h
+++ b/js/src/frontend/ParseNode.h
@@ -6,6 +6,8 @@
 #ifndef frontend_ParseNode_h
 #define frontend_ParseNode_h
 
+#include <functional>
+
 #include "mozilla/Attributes.h"
 
 #include "builtin/ModuleObject.h"
@@ -1420,6 +1422,8 @@ class ListNode : public ParseNode
         }
     };
 
+    typedef std::function<bool(ParseNode*)> predicate_fun;
+
 #ifdef DEBUG
   MOZ_MUST_USE bool contains(ParseNode* target) const {
       MOZ_ASSERT(target);
@@ -1460,6 +1464,24 @@ class ListNode : public ParseNode
         MOZ_ASSERT_IF(end, contains(end));
         return range(head(), end);
     }
+
+    // Predicate functions, like their counterparts in C++17
+    size_t count_if(predicate_fun predicate) const {
+        size_t count = 0;
+        for (ParseNode* node = head(); node; node = node->pn_next) {
+            if (predicate(node))
+                count++;
+        }
+        return count;
+    }
+
+    bool any_of(predicate_fun predicate) const {
+        for (ParseNode* node = head(); node; node = node->pn_next) {
+            if (predicate(node))
+                return true;
+        }
+        return false;
+    }
 };
 
 inline bool