PSR12/AnonClassDeclaration: prevent fixer creating parse error

CHANGELOG.md

@@ -129,6 +129,8 @@ The file documents changes to the PHP_CodeSniffer project.
     - Thanks to Juliette Reinders Folmer (@jrfnl) for the patch
 - Fixed bug #3789 : Incorrect tokenization for ternary operator with match inside of it
     - Thanks to Juliette Reinders Folmer (@jrfnl) for the patch
+- Fixed bug #3790 : PSR12/AnonClassDeclaration: prevent fixer creating parse error when there was no space before the open brace
+    - Thanks to Juliette Reinders Folmer (@jrfnl) for the patch
 - Fixed bug #3797 : Tokenizer/PHP: more context sensitive keyword fixes
     - Thanks to Juliette Reinders Folmer (@jrfnl) for the patch
 - Fixed bug #3801 : File::getMethodParameters(): allow for readonly promoted properties without visibility

src/Standards/PSR12/Sniffs/Classes/AnonClassDeclarationSniff.php

@@ -97,7 +97,11 @@ public function process(File $phpcsFile, $stackPtr)
                 $first  = $phpcsFile->findFirstOnLine(T_WHITESPACE, $stackPtr, true);
                 $indent = str_repeat(' ', ($tokens[$first]['column'] - 1));
                 $phpcsFile->fixer->beginChangeset();
-                $phpcsFile->fixer->replaceToken(($prev + 1), '');
+
+                if ($tokens[($prev + 1)]['code'] === \T_WHITESPACE) {
+                    $phpcsFile->fixer->replaceToken(($prev + 1), '');
+                }
+
                 $phpcsFile->fixer->addNewline($prev);
                 $phpcsFile->fixer->addContentBefore($opener, $indent);
                 $phpcsFile->fixer->endChangeset();

src/Standards/PSR12/Tests/Classes/AnonClassDeclarationUnitTest.inc

@@ -82,3 +82,9 @@ $foo->bar(
 
 foo(new class {
 });
+
+// Issue #3790: OpenBraceSameLine fixer should not remove open brace.
+$instance = new class() extends SomeClass implements
+    SomeInterface{
+    public function __construct() {}
+};

src/Standards/PSR12/Tests/Classes/AnonClassDeclarationUnitTest.inc.fixed

@@ -84,3 +84,10 @@ $foo->bar(
 
 foo(new class {
 });
+
+// Issue #3790: OpenBraceSameLine fixer should not remove open brace.
+$instance = new class () extends SomeClass implements
+    SomeInterface
+{
+    public function __construct() {}
+};

src/Standards/PSR12/Tests/Classes/AnonClassDeclarationUnitTest.php

@@ -48,6 +48,8 @@ public function getErrorList()
             56 => 2,
             63 => 1,
             75 => 1,
+            87 => 1,
+            88 => 1,
         ];
 
     }//end getErrorList()