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   1  <?php
   2  
   3  /**
   4  * @package   s9e\TextFormatter
   5  * @copyright Copyright (c) 2010-2022 The s9e authors
   6  * @license   http://www.opensource.org/licenses/mit-license.php The MIT License
   7  */
   8  namespace s9e\TextFormatter\Configurator\TemplateNormalizations;
   9  
  10  use DOMAttr;
  11  use s9e\TextFormatter\Configurator\Helpers\TemplateHelper;
  12  
  13  class MinifyInlineCSS extends AbstractNormalization
  14  {
  15      /**
  16      * {@inheritdoc}
  17      */
  18      protected $queries = ['//*[namespace-uri() != $XSL]/@style'];
  19  
  20      /**
  21      * {@inheritdoc}
  22      */
  23  	protected function normalizeAttribute(DOMAttr $attribute)
  24      {
  25          $css = $attribute->nodeValue;
  26  
  27          // Only minify if the value does not contain any XPath expression that's not an attribute
  28          if (!preg_match('(\\{(?!@\\w+\\}))', $css))
  29          {
  30              $attribute->nodeValue = $this->minify($css);
  31          }
  32      }
  33  
  34      /**
  35      * Minify a CSS string
  36      *
  37      * @param  string $css Original CSS
  38      * @return string      Minified CSS
  39      */
  40  	protected function minify($css)
  41      {
  42          $css = trim($css, " \n\t;");
  43          $css = preg_replace('(\\s*([,:;])\\s*)', '$1', $css);
  44          $css = preg_replace_callback(
  45              '((?<=[\\s:])#[0-9a-f]{3,6})i',
  46              function ($m)
  47              {
  48                  return strtolower($m[0]);
  49              },
  50              $css
  51          );
  52          $css = preg_replace('((?<=[\\s:])#([0-9a-f])\\1([0-9a-f])\\2([0-9a-f])\\3)', '#$1$2$3', $css);
  53          $css = preg_replace('((?<=[\\s:])#f00\\b)', 'red', $css);
  54          $css = preg_replace('((?<=[\\s:])0px\\b)', '0', $css);
  55  
  56          return $css;
  57      }
  58  }