From 39a9cf4bb49751b49c63fa8b1c65555afc73d0e7 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Sun, 11 Jul 2021 20:58:38 +0300
Subject: [PATCH] AK: Add a retreat(count) method to GenericLexer

This method can be used to rewind a constant amount backwards in the
source instead of one by one with retract()
---
 AK/GenericLexer.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/AK/GenericLexer.h b/AK/GenericLexer.h
index 131c0b24dd..e824f473a8 100644
--- a/AK/GenericLexer.h
+++ b/AK/GenericLexer.h
@@ -56,6 +56,12 @@ public:
         --m_index;
     }
 
+    constexpr void retreat(size_t count)
+    {
+        VERIFY(m_index >= count);
+        m_index -= count;
+    }
+
     constexpr char consume()
     {
         VERIFY(!is_eof());