class SyntaxSniff

class SyntaxSniff implements Sniff {
    
    /**
     * The path to the PHP version we are checking with.
     *
     * @var string
     */
    private $phpPath = null;
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_OPEN_TAG,
            T_OPEN_TAG_WITH_ECHO,
        ];
    }
    
    //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 int
     */
    public function process(File $phpcsFile, $stackPtr) {
        if ($this->phpPath === null) {
            $this->phpPath = Config::getExecutablePath('php');
        }
        $fileName = escapeshellarg($phpcsFile->getFilename());
        $cmd = Common::escapeshellcmd($this->phpPath) . " -l -d display_errors=1 -d error_prepend_string='' {$fileName} 2>&1";
        $output = shell_exec($cmd);
        $matches = [];
        if (preg_match('/^.*error:(.*) in .* on line ([0-9]+)/m', trim($output), $matches) === 1) {
            $error = trim($matches[1]);
            $line = (int) $matches[2];
            $phpcsFile->addErrorOnLine("PHP syntax error: {$error}", $line, 'PHPSyntax');
        }
        // Ignore the rest of the file.
        return $phpcsFile->numTokens;
    }
    
    //end process()

}