Fixed bug #2867 : Incorrect scope matching when arrow function used inside IF condition

Author: gsherwood

package.xml

@@ -39,6 +39,7 @@ http://pear.php.net/dtd/package-2.0.xsd">
   - Fixed bug #2853 : Undefined variable error when using Info report
     -- Thanks to Juliette Reinders Folmer for the patch
   - Fixed bug #2865 : Double arrow tokenized as T_STRING when placed after function named "fn"
+  - Fixed bug #2867 : Incorrect scope matching when arrow function used inside IF condition
   - Fixed bug #2868 : phpcs:ignore annotation doesnt work inside a docblock
   - Fixed bug #2878 : PSR12.Files.FileHeader conflicts with Generic.Files.LineEndings
   - Fixed bug #2895 : PSR2.Methods.FunctionCallSignature.MultipleArguments false positive with arrow function argument

src/Standards/Generic/Tests/ControlStructures/InlineControlStructureUnitTest.1.inc

@@ -250,3 +250,6 @@ $i = 10;
 while ($i > 0 && --$i);
 
 for ($i = 1, $j = 0; $i <= 10; $j += $i, print $i, $i++);
+
+if ($this->valid(fn(): bool => 2 > 1)) {
+}

src/Standards/Generic/Tests/ControlStructures/InlineControlStructureUnitTest.1.inc.fixed

@@ -283,3 +283,6 @@ $i = 10;
 while ($i > 0 && --$i);
 
 for ($i = 1, $j = 0; $i <= 10; $j += $i, print $i, $i++);
+
+if ($this->valid(fn(): bool => 2 > 1)) {
+}

src/Tokenizers/Tokenizer.php

@@ -1314,15 +1314,31 @@ private function recurseScopeMap($stackPtr, $depth=1, &$ignore=0)
                 }//end if
 
                 if ($ignore === 0 || $tokenType !== T_OPEN_CURLY_BRACKET) {
-                    // We found the opening scope token for $currType.
-                    if (PHP_CODESNIFFER_VERBOSITY > 1) {
-                        $type = $this->tokens[$stackPtr]['type'];
-                        echo str_repeat("\t", $depth);
-                        echo "=> Found scope opener for $stackPtr:$type".PHP_EOL;
-                    }
+                    $openerNested = isset($this->tokens[$i]['nested_parenthesis']);
+                    $ownerNested  = isset($this->tokens[$stackPtr]['nested_parenthesis']);
 
-                    $opener = $i;
-                }
+                    if (($openerNested === true && $ownerNested === false)
+                        || ($openerNested === false && $ownerNested === true)
+                        || ($openerNested === true
+                        && $this->tokens[$i]['nested_parenthesis'] !== $this->tokens[$stackPtr]['nested_parenthesis'])
+                    ) {
+                        // We found the a token that looks like the opener, but it's nested differently.
+                        if (PHP_CODESNIFFER_VERBOSITY > 1) {
+                            $type = $this->tokens[$i]['type'];
+                            echo str_repeat("\t", $depth);
+                            echo "* ignoring possible opener $i:$type as nested parenthesis don't match *".PHP_EOL;
+                        }
+                    } else {
+                        // We found the opening scope token for $currType.
+                        if (PHP_CODESNIFFER_VERBOSITY > 1) {
+                            $type = $this->tokens[$stackPtr]['type'];
+                            echo str_repeat("\t", $depth);
+                            echo "=> Found scope opener for $stackPtr:$type".PHP_EOL;
+                        }
+
+                        $opener = $i;
+                    }
+                }//end if
             } else if ($tokenType === T_SEMICOLON
                 && $opener === null
                 && (isset($this->tokens[$stackPtr]['parenthesis_closer']) === false