class ObjectInstantiationSniff

class ObjectInstantiationSniff implements Sniff {
    
    /**
     * Registers the token types that this sniff wishes to listen to.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_NEW,
        ];
    }
    
    //end register()
    
    /**
     * Process the tokens that this sniff is listening for.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file where the token was found.
     * @param int                         $stackPtr  The position in the stack where
     *                                               the token was found.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        $allowedTokens = Tokens::$emptyTokens;
        $allowedTokens[] = T_BITWISE_AND;
        $prev = $phpcsFile->findPrevious($allowedTokens, $stackPtr - 1, null, true);
        $allowedTokens = [
            T_EQUAL => T_EQUAL,
            T_COALESCE_EQUAL => T_COALESCE_EQUAL,
            T_DOUBLE_ARROW => T_DOUBLE_ARROW,
            T_FN_ARROW => T_FN_ARROW,
            T_MATCH_ARROW => T_MATCH_ARROW,
            T_THROW => T_THROW,
            T_RETURN => T_RETURN,
        ];
        if (isset($allowedTokens[$tokens[$prev]['code']]) === true) {
            return;
        }
        $ternaryLikeTokens = [
            T_COALESCE => true,
            T_INLINE_THEN => true,
            T_INLINE_ELSE => true,
        ];
        // For ternary like tokens, walk a little further back to see if it is preceded by
        // one of the allowed tokens (within the same statement).
        if (isset($ternaryLikeTokens[$tokens[$prev]['code']]) === true) {
            $hasAllowedBefore = $phpcsFile->findPrevious($allowedTokens, $prev - 1, null, false, null, true);
            if ($hasAllowedBefore !== false) {
                return;
            }
        }
        $error = 'New objects must be assigned to a variable';
        $phpcsFile->addError($error, $stackPtr, 'NotAssigned');
    }
    
    //end process()

}