class OptimizedFunctionsWithoutUnpackingSniff

class OptimizedFunctionsWithoutUnpackingSniff implements Sniff {
    public const CODE_UNPACKING_USED = 'UnpackingUsed';
    
    /**
     * @return array<int, (int|string)>
     */
    public function register() : array {
        return TokenHelper::getOnlyNameTokenCodes();
    }
    
    /**
     * @phpcsSuppress SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
     * @param int $pointer
     */
    public function process(File $phpcsFile, $pointer) : void {
        $previousTokenPointer = TokenHelper::findPreviousEffective($phpcsFile, $pointer - 1);
        $openBracketPointer = TokenHelper::findNextEffective($phpcsFile, $pointer + 1);
        $tokens = $phpcsFile->getTokens();
        if ($openBracketPointer === null || $tokens[$openBracketPointer]['code'] !== T_OPEN_PARENTHESIS) {
            return;
        }
        if (in_array($tokens[$previousTokenPointer]['code'], [
            T_FUNCTION,
            T_NEW,
            T_OBJECT_OPERATOR,
        ], true)) {
            return;
        }
        
        /** @var int $tokenBeforeInvocationPointer */
        $tokenBeforeInvocationPointer = TokenHelper::findPreviousExcluding($phpcsFile, TokenHelper::getNameTokenCodes(), $pointer);
        $invokedName = TokenHelper::getContent($phpcsFile, $tokenBeforeInvocationPointer + 1, $pointer);
        $useName = sprintf('function %s', $invokedName);
        $uses = UseStatementHelper::getUseStatementsForPointer($phpcsFile, $pointer);
        if ($invokedName[0] === '\\') {
            $invokedName = substr($invokedName, 1);
        }
        elseif (array_key_exists($useName, $uses) && $uses[$useName]->isFunction()) {
            $invokedName = $uses[$useName]->getFullyQualifiedTypeName();
        }
        elseif (NamespaceHelper::findCurrentNamespaceName($phpcsFile, $pointer) !== null) {
            return;
        }
        if (!in_array($invokedName, FunctionHelper::SPECIAL_FUNCTIONS, true)) {
            return;
        }
        $closeBracketPointer = $tokens[$openBracketPointer]['parenthesis_closer'];
        if (TokenHelper::findNextEffective($phpcsFile, $openBracketPointer + 1, $closeBracketPointer + 1) === $closeBracketPointer) {
            return;
        }
        $pointerBeforeCloseBracket = TokenHelper::findPreviousEffective($phpcsFile, $closeBracketPointer - 1);
        $startPointer = $tokens[$pointerBeforeCloseBracket]['code'] === T_COMMA ? $pointerBeforeCloseBracket : $closeBracketPointer;
        do {
            $lastArgumentSeparatorPointer = TokenHelper::findPrevious($phpcsFile, [
                T_COMMA,
            ], $startPointer - 1, $openBracketPointer);
            $startPointer = $lastArgumentSeparatorPointer;
        } while ($lastArgumentSeparatorPointer !== null && $tokens[$lastArgumentSeparatorPointer]['level'] !== $tokens[$openBracketPointer]['level']);
        if ($lastArgumentSeparatorPointer === null) {
            $lastArgumentSeparatorPointer = $openBracketPointer;
        }
        
        /** @var int $nextTokenAfterSeparatorPointer */
        $nextTokenAfterSeparatorPointer = TokenHelper::findNextEffective($phpcsFile, $lastArgumentSeparatorPointer + 1, $closeBracketPointer);
        if ($tokens[$nextTokenAfterSeparatorPointer]['code'] !== T_ELLIPSIS) {
            return;
        }
        if (TokenHelper::findNextEffective($phpcsFile, $nextTokenAfterSeparatorPointer + 1) === $closeBracketPointer) {
            // First class callables
            return;
        }
        $phpcsFile->addError(sprintf('Function %s is specialized by PHP and should not use argument unpacking.', $invokedName), $nextTokenAfterSeparatorPointer, self::CODE_UNPACKING_USED);
    }

}