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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\Plugins\Litedown\Parser\Passes;
   9  
  10  abstract class AbstractInlineMarkup extends AbstractPass
  11  {
  12      /**
  13      * Parse given inline markup in text
  14      *
  15      * The markup must start and end with exactly 2 characters
  16      *
  17      * @param  string $str     First markup string
  18      * @param  string $regexp  Regexp used to match the markup's span
  19      * @param  string $tagName Name of the tag produced by this markup
  20      * @return void
  21      */
  22  	protected function parseInlineMarkup(string $str, string $regexp, string $tagName): void
  23      {
  24          $pos = $this->text->indexOf($str);
  25          if ($pos === false)
  26          {
  27              return;
  28          }
  29  
  30          preg_match_all($regexp, $this->text, $matches, PREG_OFFSET_CAPTURE, $pos);
  31          foreach ($matches[0] as [$match, $matchPos])
  32          {
  33              $matchLen = strlen($match);
  34              $endPos   = $matchPos + $matchLen - 2;
  35  
  36              $this->parser->addTagPair($tagName, $matchPos, 2, $endPos, 2);
  37              $this->text->overwrite($matchPos, 2);
  38              $this->text->overwrite($endPos, 2);
  39          }
  40      }
  41  }