[Summary view]

   1  <?php
   2  
   3  namespace Sabberworm\CSS\Property;
   4  
   5  class KeyframeSelector extends Selector
   6  {
   7      /**
   8       * regexp for specificity calculations
   9       *
  10       * @var string
  11       */
  12      const SELECTOR_VALIDATION_RX = '/
  13      ^(
  14          (?:
  15              [a-zA-Z0-9\x{00A0}-\x{FFFF}_^$|*="\'~\[\]()\-\s\.:#+>]* # any sequence of valid unescaped characters
  16              (?:\\\\.)?                                              # a single escaped character
  17              (?:([\'"]).*?(?<!\\\\)\2)?                              # a quoted text like [id="example"]
  18          )*
  19      )|
  20      (\d+%)                                                          # keyframe animation progress percentage (e.g. 50%)
  21      $
  22      /ux';
  23  }