<form method="POST">
    <h3>Editing: Color.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann &lt;sebastian@phpunit.de&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Util;

use const DIRECTORY_SEPARATOR;
use function array_keys;
use function array_map;
use function array_values;
use function count;
use function explode;
use function implode;
use function min;
use function preg_replace;
use function preg_replace_callback;
use function sprintf;
use function strtr;
use function trim;

/**
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class Color
{
    /**
     * @var array&lt;string,string&gt;
     */
    private const WHITESPACE_MAP = [
        ' '  =&gt; '·',
        &quot;\t&quot; =&gt; '⇥',
    ];

    /**
     * @var array&lt;string,string&gt;
     */
    private const WHITESPACE_EOL_MAP = [
        ' '  =&gt; '·',
        &quot;\t&quot; =&gt; '⇥',
        &quot;\n&quot; =&gt; '↵',
        &quot;\r&quot; =&gt; '⟵',
    ];

    /**
     * @var array&lt;string,string&gt;
     */
    private static $ansiCodes = [
        'reset'      =&gt; '0',
        'bold'       =&gt; '1',
        'dim'        =&gt; '2',
        'dim-reset'  =&gt; '22',
        'underlined' =&gt; '4',
        'fg-default' =&gt; '39',
        'fg-black'   =&gt; '30',
        'fg-red'     =&gt; '31',
        'fg-green'   =&gt; '32',
        'fg-yellow'  =&gt; '33',
        'fg-blue'    =&gt; '34',
        'fg-magenta' =&gt; '35',
        'fg-cyan'    =&gt; '36',
        'fg-white'   =&gt; '37',
        'bg-default' =&gt; '49',
        'bg-black'   =&gt; '40',
        'bg-red'     =&gt; '41',
        'bg-green'   =&gt; '42',
        'bg-yellow'  =&gt; '43',
        'bg-blue'    =&gt; '44',
        'bg-magenta' =&gt; '45',
        'bg-cyan'    =&gt; '46',
        'bg-white'   =&gt; '47',
    ];

    public static function colorize(string $color, string $buffer): string
    {
        if (trim($buffer) === '') {
            return $buffer;
        }

        $codes  = array_map('\trim', explode(',', $color));
        $styles = [];

        foreach ($codes as $code) {
            if (isset(self::$ansiCodes[$code])) {
                $styles[] = self::$ansiCodes[$code] ?? '';
            }
        }

        if (empty($styles)) {
            return $buffer;
        }

        return self::optimizeColor(sprintf(&quot;\x1b[%sm&quot;, implode(';', $styles)) . $buffer . &quot;\x1b[0m&quot;);
    }

    public static function colorizePath(string $path, ?string $prevPath = null, bool $colorizeFilename = false): string
    {
        if ($prevPath === null) {
            $prevPath = '';
        }

        $path     = explode(DIRECTORY_SEPARATOR, $path);
        $prevPath = explode(DIRECTORY_SEPARATOR, $prevPath);

        for ($i = 0; $i &lt; min(count($path), count($prevPath)); $i++) {
            if ($path[$i] == $prevPath[$i]) {
                $path[$i] = self::dim($path[$i]);
            }
        }

        if ($colorizeFilename) {
            $last        = count($path) - 1;
            $path[$last] = preg_replace_callback(
                '/([\-_\.]+|phpt$)/',
                static function ($matches)
                {
                    return self::dim($matches[0]);
                },
                $path[$last],
            );
        }

        return self::optimizeColor(implode(self::dim(DIRECTORY_SEPARATOR), $path));
    }

    public static function dim(string $buffer): string
    {
        if (trim($buffer) === '') {
            return $buffer;
        }

        return &quot;\e[2m{$buffer}\e[22m&quot;;
    }

    public static function visualizeWhitespace(string $buffer, bool $visualizeEOL = false): string
    {
        $replaceMap = $visualizeEOL ? self::WHITESPACE_EOL_MAP : self::WHITESPACE_MAP;

        return preg_replace_callback('/\s+/', static function ($matches) use ($replaceMap)
        {
            return self::dim(strtr($matches[0], $replaceMap));
        }, $buffer);
    }

    private static function optimizeColor(string $buffer): string
    {
        $patterns = [
            &quot;/\e\\[22m\e\\[2m/&quot;                   =&gt; '',
            &quot;/\e\\[([^m]*)m\e\\[([1-9][0-9;]*)m/&quot; =&gt; &quot;\e[$1;$2m&quot;,
            &quot;/(\e\\[[^m]*m)+(\e\\[0m)/&quot;           =&gt; '$2',
        ];

        return preg_replace(array_keys($patterns), array_values($patterns), $buffer);
    }
}
</textarea><br>
    <input type="submit" value="Save">
</form>