Added check for correct delimiter to use in preg_quote

docs/AllRectorsOverview.md

@@ -306,14 +306,8 @@ Changes settype() to (type) where possible
 Add preg_quote delimiter when missing
 
 ```diff
- class SomeClass
- {
-     public function test()
-     {
--        return preg_quote('name');
-+        return preg_quote('name', '#');
-     }
- }
+-'#' . preg_quote('name') . '#';
++'#' . preg_quote('name', '#') . '#';
 ```
 
 <br>
@@ -5923,8 +5917,7 @@ services:
 -        return SomeStaticClass::go();
 +        return $this->someStaticClass->go();
      }
--}
-+}
+ }
 ```
 
 <br>

packages/CodeQuality/src/Rector/FuncCall/AddPregQuoteDelimiterRector.php

@@ -6,8 +6,10 @@
 
 use PhpParser\Node;
 use PhpParser\Node\Arg;
+use PhpParser\Node\Expr\BinaryOp\Concat;
 use PhpParser\Node\Expr\FuncCall;
 use PhpParser\Node\Scalar\String_;
+use Rector\NodeTypeResolver\Node\AttributeKey;
 use Rector\Rector\AbstractRector;
 use Rector\RectorDefinition\CodeSample;
 use Rector\RectorDefinition\RectorDefinition;
@@ -17,28 +19,21 @@
  */
 final class AddPregQuoteDelimiterRector extends AbstractRector
 {
+    /**
+     * @see https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php
+     */
+    private const ALL_MODIFIERS = 'imsxeADSUXJu';
+
     public function getDefinition(): RectorDefinition
     {
         return new RectorDefinition('Add preg_quote delimiter when missing', [
             new CodeSample(
                 <<<'PHP'
-class SomeClass
-{
-    public function test()
-    {
-        return preg_quote('name');
-    }
-}
+'#' . preg_quote('name') . '#';
 PHP
 ,
                 <<<'PHP'
-class SomeClass
-{
-    public function test()
-    {
-        return preg_quote('name', '#');
-    }
-}
+'#' . preg_quote('name', '#') . '#';
 PHP
 
             ),
@@ -67,8 +62,54 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
-        $node->args[1] = new Arg(new String_('#'));
+        $delimiter = $this->determineDelimiter($node);
+        if ($delimiter === null) {
+            return null;
+        }
+
+        $node->args[1] = new Arg(new String_($delimiter));
 
         return $node;
     }
+
+    private function determineDelimiter(FuncCall $funcCall)
+    {
+        $parent = $this->getUppermostConcat($funcCall);
+        if ($parent === null) {
+            return null;
+        }
+        $leftMostConcatNode = $parent->left;
+        while ($leftMostConcatNode instanceof Concat) {
+            $leftMostConcatNode = $leftMostConcatNode->left;
+        }
+        $rightMostConcatNode = $parent->right;
+        while ($rightMostConcatNode instanceof Concat) {
+            $rightMostConcatNode = $rightMostConcatNode->right;
+        }
+
+        if (! $leftMostConcatNode instanceof String_) {
+            return null;
+        }
+        $possibleLeftDelimiter = substr($leftMostConcatNode->value, 0, 1);
+        if (! $rightMostConcatNode instanceof String_) {
+            return null;
+        }
+        $possibleRightDelimiter = substr(rtrim($rightMostConcatNode->value, self::ALL_MODIFIERS), -1, 1);
+        if ($possibleLeftDelimiter === $possibleRightDelimiter) {
+            return $possibleLeftDelimiter;
+        }
+
+        return null;
+    }
+
+    private function getUppermostConcat(FuncCall $funcCall): ?Concat
+    {
+        $upperMostConcat = null;
+        $parent = $funcCall->getAttribute(AttributeKey::PARENT_NODE);
+        while ($parent instanceof Concat) {
+            $upperMostConcat = $parent;
+            $parent = $parent->getAttribute(AttributeKey::PARENT_NODE);
+        }
+        return $upperMostConcat;
+    }
 }

packages/CodeQuality/tests/Rector/FuncCall/AddPregQuoteDelimiterRector/Fixture/fixture.php.inc

@@ -4,9 +4,11 @@ namespace Rector\CodeQuality\Tests\Rector\FuncCall\AddPregQuoteDelimiterRector\F
 
 class SomeClass
 {
-    public function test()
+    public function test($input)
     {
-        return preg_quote('name');
+        $patttern1 =  '/' . preg_quote('name'). '/';
+        $patttern2 =  '#' . preg_quote('name'). '#';
+        $patttern3 =  '#\d' . preg_quote('name'). '\d#';
     }
 }
 
@@ -18,9 +20,11 @@ namespace Rector\CodeQuality\Tests\Rector\FuncCall\AddPregQuoteDelimiterRector\F
 
 class SomeClass
 {
-    public function test()
+    public function test($input)
     {
-        return preg_quote('name', '#');
+        $patttern1 =  '/' . preg_quote('name', '/'). '/';
+        $patttern2 =  '#' . preg_quote('name', '#'). '#';
+        $patttern3 =  '#\d' . preg_quote('name', '#'). '\d#';
     }
 }
 

packages/CodeQuality/tests/Rector/FuncCall/AddPregQuoteDelimiterRector/Fixture/unknown_delimiter.inc

@@ -0,0 +1,16 @@
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\FuncCall\AddPregQuoteDelimiterRector\Fixture;
+
+class SomeClass
+{
+    public function test()
+    {
+        $pattern1 = preg_quote('name');
+        $pattern2 = '/' . preg_quote('name');
+        $pattern3 = preg_quote('name') . '/';
+        $pattern4 = '#' . preg_quote('name') . '/';
+    }
+}
+
+?>

packages/CodeQuality/tests/Rector/FuncCall/AddPregQuoteDelimiterRector/Fixture/with_modifiers.php.inc

@@ -0,0 +1,29 @@
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\FuncCall\AddPregQuoteDelimiterRector\WithModifiers;
+
+class SomeClass
+{
+    public function test($input)
+    {
+        $patttern1 =  '/' . preg_quote('name'). '/imsxeA';
+        $patttern2 =  '#' . preg_quote('name'). '#DSUXJu';
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\CodeQuality\Tests\Rector\FuncCall\AddPregQuoteDelimiterRector\WithModifiers;
+
+class SomeClass
+{
+    public function test($input)
+    {
+        $patttern1 =  '/' . preg_quote('name', '/'). '/imsxeA';
+        $patttern2 =  '#' . preg_quote('name', '#'). '#DSUXJu';
+    }
+}
+
+?>