<?php
 
/*
 
visualize color sets as boxes
 
{{colorbox background_color="#FDFEB8" border_color="#FFBB00"}}
    $background_color    - background color
    $border_color        - border color
    $text                - description
    $text_color            - text color
    $border_width        - border width
    $width                - width
    $spec                - show color values
*/
 
// set defaults
$text                ??= null;
$border_width        ??= '1px';
$background_color    ??= '#ffa';
$border_color        ??= '#000000';
$text_color            ??= '#000000';
$width                ??= '200px';
$spec                ??= 1;
 
$sanitize = function($value, $filter)
{
    switch ($filter)
    {
        case 'color':
            if (preg_match('/^(
                (\#([0-9a-fA-F]{3}|[0-9a-fA-F]{6}))|        # color value
                (rgb\(([0-9]{1,3}%?,){2}[0-9]{1,3}%?\))        # rgb triplet
                )$/x', $value))
            {
                return $value;
            }
            break;
        case 'width':
            if (preg_match('/^\d*\.?\d+(%|px|em|ex|pt|cm|mm|pi|in)$/', $value))
            {
                return $value;
            }
        case 'class':
            if (preg_match('/[^A-Za-z0-9_-]/', $value))
            {
                return $value;
            }
            break;
    }
};
 
echo '<div style="
    background-color: '    . $sanitize($background_color, 'color') . ';
    border: '            . $sanitize($border_width, 'width') . ' solid ' . $sanitize($border_color, 'color') . ';
    width: '             . $sanitize($width, 'width') . ';
    clear: both;
    margin: 10px 0;
    padding: 10px;
    color: ' . $sanitize($text_color, 'color') . ';
    float: left;">' .
    $this->format($text) . ''.
    ($spec
        ? '<br>' .
          'background: '    . $sanitize($background_color, 'color') . '<br>' .
          'border: '        . $sanitize($border_color, 'color') . '<br>' .
          'color: '            . $sanitize($text_color, 'color') . ''
        : ''
    ) . "</div>\n";