class ESLintSniff

class ESLintSniff implements Sniff {
    
    /**
     * A list of tokenizers this sniff supports.
     *
     * @var array
     */
    public $supportedTokenizers = [
        'JS',
    ];
    
    /**
     * ESLint configuration file path.
     *
     * @var string|null Path to eslintrc. Null to autodetect.
     */
    public $configFile = null;
    
    /**
     * Returns the token types that this sniff is interested in.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_OPEN_TAG,
        ];
    }
    
    //end register()
    
    /**
     * Processes the tokens that this sniff is interested in.
     *
     * @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 int
     * @throws \PHP_CodeSniffer\Exceptions\RuntimeException If jshint.js could not be run.
     */
    public function process(File $phpcsFile, $stackPtr) {
        $eslintPath = Config::getExecutablePath('eslint');
        if ($eslintPath === null) {
            return $phpcsFile->numTokens;
        }
        $filename = $phpcsFile->getFilename();
        $configFile = $this->configFile;
        if (empty($configFile) === true) {
            // Attempt to autodetect.
            $candidates = glob('.eslintrc{.js,.yaml,.yml,.json}', GLOB_BRACE);
            if (empty($candidates) === false) {
                $configFile = $candidates[0];
            }
        }
        $eslintOptions = [
            '--format json',
        ];
        if (empty($configFile) === false) {
            $eslintOptions[] = '--config ' . escapeshellarg($configFile);
        }
        $cmd = Common::escapeshellcmd(escapeshellarg($eslintPath) . ' ' . implode(' ', $eslintOptions) . ' ' . escapeshellarg($filename));
        // Execute!
        exec($cmd, $stdout, $code);
        if ($code <= 0) {
            // No errors, continue.
            return $phpcsFile->numTokens;
        }
        $data = json_decode(implode("\n", $stdout));
        if (json_last_error() !== JSON_ERROR_NONE) {
            // Ignore any errors.
            return $phpcsFile->numTokens;
        }
        // Data is a list of files, but we only pass a single one.
        $messages = $data[0]->messages;
        foreach ($messages as $error) {
            $message = 'eslint says: ' . $error->message;
            if (empty($error->fatal) === false || $error->severity === 2) {
                $phpcsFile->addErrorOnLine($message, $error->line, 'ExternalTool');
            }
            else {
                $phpcsFile->addWarningOnLine($message, $error->line, 'ExternalTool');
            }
        }
        // Ignore the rest of the file.
        return $phpcsFile->numTokens;
    }
    
    //end process()

}