From 50ca944278c9d7bc6e0c69ab66ab0e9a993e426b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gabriel=20Ostroluck=C3=BD?= <gadelat@gmail.com>
Date: Sun, 19 Feb 2017 23:03:20 +0100
Subject: [PATCH] [Serializer] Reduce complexity of NameConverter

Cleaner and faster implementation of camelcase normalization.
Speed improvement is particularly visible in long string input.
---
 .../CamelCaseToSnakeCaseNameConverter.php          | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php b/src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php
index 861c37b349..b6c6284093 100644
--- a/src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php
+++ b/src/Symfony/Component/Serializer/NameConverter/CamelCaseToSnakeCaseNameConverter.php
@@ -44,19 +44,7 @@ class CamelCaseToSnakeCaseNameConverter implements NameConverterInterface
     public function normalize($propertyName)
     {
         if (null === $this->attributes || in_array($propertyName, $this->attributes)) {
-            $lcPropertyName = lcfirst($propertyName);
-            $snakeCasedName = '';
-
-            $len = strlen($lcPropertyName);
-            for ($i = 0; $i < $len; ++$i) {
-                if (ctype_upper($lcPropertyName[$i])) {
-                    $snakeCasedName .= '_'.strtolower($lcPropertyName[$i]);
-                } else {
-                    $snakeCasedName .= strtolower($lcPropertyName[$i]);
-                }
-            }
-
-            return $snakeCasedName;
+            return strtolower(preg_replace('/[A-Z]/', '_\\0', lcfirst($propertyName)));
         }
 
         return $propertyName;