class LanguageConstructSpacingSniff

class LanguageConstructSpacingSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_ECHO,
            T_PRINT,
            T_RETURN,
            T_INCLUDE,
            T_INCLUDE_ONCE,
            T_REQUIRE,
            T_REQUIRE_ONCE,
            T_NEW,
            T_YIELD,
            T_YIELD_FROM,
            T_THROW,
            T_NAMESPACE,
            T_USE,
        ];
    }
    
    //end register()
    
    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the current token in
     *                                               the stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        $nextToken = $phpcsFile->findNext(T_WHITESPACE, $stackPtr + 1, null, true);
        if ($nextToken === false) {
            // Skip when at end of file.
            return;
        }
        if ($tokens[$stackPtr + 1]['code'] === T_SEMICOLON) {
            // No content for this language construct.
            return;
        }
        $content = $tokens[$stackPtr]['content'];
        if ($tokens[$stackPtr]['code'] === T_NAMESPACE) {
            $nextNonEmpty = $phpcsFile->findNext(Tokens::$emptyTokens, $stackPtr + 1, null, true);
            if ($nextNonEmpty !== false && $tokens[$nextNonEmpty]['code'] === T_NS_SEPARATOR) {
                // Namespace keyword used as operator, not as the language construct.
                return;
            }
        }
        if ($tokens[$stackPtr]['code'] === T_YIELD_FROM && strtolower($content) !== 'yield from') {
            $found = $content;
            $hasComment = false;
            $yieldFromEnd = $stackPtr;
            // Handle potentially multi-line/multi-token "yield from" expressions.
            if (preg_match('`yield\\s+from`i', $content) !== 1) {
                for ($i = $stackPtr + 1; $i < $phpcsFile->numTokens; $i++) {
                    if (isset(Tokens::$emptyTokens[$tokens[$i]['code']]) === false && $tokens[$i]['code'] !== T_YIELD_FROM) {
                        break;
                    }
                    if (isset(Tokens::$commentTokens[$tokens[$i]['code']]) === true) {
                        $hasComment = true;
                    }
                    $found .= $tokens[$i]['content'];
                    if ($tokens[$i]['code'] === T_YIELD_FROM && strtolower(trim($tokens[$i]['content'])) === 'from') {
                        break;
                    }
                }
                $yieldFromEnd = $i;
            }
            
            //end if
            $error = 'Language constructs must be followed by a single space; expected 1 space between YIELD FROM found "%s"';
            $data = [
                Common::prepareForOutput($found),
            ];
            if ($hasComment === true) {
                $phpcsFile->addError($error, $stackPtr, 'IncorrectYieldFromWithComment', $data);
            }
            else {
                $fix = $phpcsFile->addFixableError($error, $stackPtr, 'IncorrectYieldFrom', $data);
                if ($fix === true) {
                    preg_match('/yield/i', $found, $yield);
                    preg_match('/from/i', $found, $from);
                    $phpcsFile->fixer
                        ->beginChangeset();
                    $phpcsFile->fixer
                        ->replaceToken($stackPtr, $yield[0] . ' ' . $from[0]);
                    for ($i = $stackPtr + 1; $i <= $yieldFromEnd; $i++) {
                        $phpcsFile->fixer
                            ->replaceToken($i, '');
                    }
                    $phpcsFile->fixer
                        ->endChangeset();
                }
            }
            
            //end if
            return $yieldFromEnd + 1;
        }
        
        //end if
        if ($tokens[$stackPtr + 1]['code'] === T_WHITESPACE) {
            $content = $tokens[$stackPtr + 1]['content'];
            if ($content !== ' ') {
                $error = 'Language constructs must be followed by a single space; expected 1 space but found "%s"';
                $data = [
                    Common::prepareForOutput($content),
                ];
                $fix = $phpcsFile->addFixableError($error, $stackPtr, 'IncorrectSingle', $data);
                if ($fix === true) {
                    $phpcsFile->fixer
                        ->replaceToken($stackPtr + 1, ' ');
                }
            }
        }
        else {
            if ($tokens[$stackPtr + 1]['code'] !== T_OPEN_PARENTHESIS) {
                $error = 'Language constructs must be followed by a single space; expected "%s" but found "%s"';
                $data = [
                    $tokens[$stackPtr]['content'] . ' ' . $tokens[$stackPtr + 1]['content'],
                    $tokens[$stackPtr]['content'] . $tokens[$stackPtr + 1]['content'],
                ];
                $fix = $phpcsFile->addFixableError($error, $stackPtr, 'Incorrect', $data);
                if ($fix === true) {
                    $phpcsFile->fixer
                        ->addContent($stackPtr, ' ');
                }
            }
        }
        
        //end if
    }
    
    //end process()

}