From 29d907d1580b7967667e0243857324fd0eaa1473 Mon Sep 17 00:00:00 2001
From: Thomas Weinert <thomas@weinert.info>
Date: Thu, 5 Apr 2018 15:29:01 +0200
Subject: [PATCH] Add upper/lower fallbacks using PCRE (only for ASCII letters)

---
 src/system/Papaya/Util/String/Utf8.php       | 18 ++++++++++---
 tests/system/Papaya/Util/String/Utf8Test.php | 28 +++++++++++++++++++-
 2 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/src/system/Papaya/Util/String/Utf8.php b/src/system/Papaya/Util/String/Utf8.php
index 193a554fd..d1249979f 100644
--- a/src/system/Papaya/Util/String/Utf8.php
+++ b/src/system/Papaya/Util/String/Utf8.php
@@ -225,7 +225,13 @@ public static function toLowerCase($string) {
     case self::EXT_MBSTRING :
       return mb_strtolower($string, 'utf-8');
     }
-    return $string;
+    return preg_replace_callback(
+      '([A-Z]+)u',
+      function($match) {
+        return strtolower($match[0]);
+      },
+      $string
+    );
   }
 
   public static function toUpperCase($string) {
@@ -240,7 +246,13 @@ public static function toUpperCase($string) {
     case self::EXT_MBSTRING :
       return mb_strtoupper($string, 'utf-8');
     }
-    return $string;
+    return preg_replace_callback(
+      '([a-z]+)u',
+      function($match) {
+        return strtoupper($match[0]);
+      },
+      $string
+    );
   }
 
   /**
@@ -274,4 +286,4 @@ public static function getExtension() {
   public static function setExtension($extension) {
     self::$extension = (int)$extension;
   }
-}
\ No newline at end of file
+}
diff --git a/tests/system/Papaya/Util/String/Utf8Test.php b/tests/system/Papaya/Util/String/Utf8Test.php
index f8193d822..138f86cda 100644
--- a/tests/system/Papaya/Util/String/Utf8Test.php
+++ b/tests/system/Papaya/Util/String/Utf8Test.php
@@ -114,6 +114,32 @@ public function testCopyUsingPcreFallback($expected, $haystack, $start, $length
   }
 
   /**
+   * @param string $expected
+   * @param string $input
+   * @covers PapayaUtilStringUtf8::toLowerCase
+   * @testWith
+   *   ["abc", "ABC"]
+   *   ["abcÄdef", "ABCÄDEF"]
+   */
+  public function testLowerCaseUsingPcreFallback($expected, $input) {
+    PapayaUtilStringUtf8::setExtension(PapayaUtilStringUtf8::EXT_PCRE);
+    $this->assertEquals($expected, PapayaUtilStringUtf8::toLowerCase($input));
+  }
+
+  /**
+   * @param string $expected
+   * @param string $input
+   * @covers PapayaUtilStringUtf8::toUpperCase
+   * @testWith
+   *   ["ABC", "abc"]
+   *   ["ABCäDEF", "abcädef"]
+   */
+  public function testUpperCaseUsingPcreFallback($expected, $input) {
+    PapayaUtilStringUtf8::setExtension(PapayaUtilStringUtf8::EXT_PCRE);
+    $this->assertEquals($expected, PapayaUtilStringUtf8::toUpperCase($input));
+  }
+
+    /**
   * @covers PapayaUtilStringUtf8::getExtension
   */
   public function testGetExtension() {
@@ -205,4 +231,4 @@ public static function provideCopySamples() {
       'ascii 10, 10' => array('', 'ascii', 10, 10)
     );
   }
-}
\ No newline at end of file
+}