class HtmlOutputFormatter

class HtmlOutputFormatter extends OutputFormatter {
    
    /** @var array<int, string> */
    private static $availableForegroundColors = [
        30 => 'black',
        31 => 'red',
        32 => 'green',
        33 => 'yellow',
        34 => 'blue',
        35 => 'magenta',
        36 => 'cyan',
        37 => 'white',
    ];
    
    /** @var array<int, string> */
    private static $availableBackgroundColors = [
        40 => 'black',
        41 => 'red',
        42 => 'green',
        43 => 'yellow',
        44 => 'blue',
        45 => 'magenta',
        46 => 'cyan',
        47 => 'white',
    ];
    
    /** @var array<int, string> */
    private static $availableOptions = [
        1 => 'bold',
        4 => 'underscore',
    ];
    
    /**
     * @param array<string, OutputFormatterStyle> $styles Array of "name => FormatterStyle" instances
     */
    public function __construct(array $styles = []) {
        parent::__construct(true, $styles);
    }
    public function format(?string $message) : ?string {
        $formatted = parent::format($message);
        if ($formatted === null) {
            return null;
        }
        $clearEscapeCodes = '(?:39|49|0|22|24|25|27|28)';
        return Preg::replaceCallback("{\x1b\\[([0-9;]+)m(.*?)\x1b\\[(?:" . $clearEscapeCodes . ";)*?" . $clearEscapeCodes . "m}s", Closure::fromCallable([
            $this,
            'formatHtml',
        ]), $formatted);
    }
    
    /**
     * @param array<string|null> $matches
     */
    private function formatHtml(array $matches) : string {
        assert(is_string($matches[1]));
        $out = '<span style="';
        foreach (explode(';', $matches[1]) as $code) {
            if (isset(self::$availableForegroundColors[(int) $code])) {
                $out .= 'color:' . self::$availableForegroundColors[(int) $code] . ';';
            }
            elseif (isset(self::$availableBackgroundColors[(int) $code])) {
                $out .= 'background-color:' . self::$availableBackgroundColors[(int) $code] . ';';
            }
            elseif (isset(self::$availableOptions[(int) $code])) {
                switch (self::$availableOptions[(int) $code]) {
                    case 'bold':
                        $out .= 'font-weight:bold;';
                        break;
                    case 'underscore':
                        $out .= 'text-decoration:underline;';
                        break;
                }
            }
        }
        return $out . '">' . $matches[2] . '</span>';
    }

}