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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 AbstractScript extends AbstractPass
  11  {
  12      /**
  13      * @var string $longRegexp Regexp used for the long form syntax
  14      */
  15      protected $longRegexp;
  16  
  17      /**
  18      * @var string Regexp used for the short form syntax
  19      */
  20      protected $shortRegexp;
  21  
  22      /**
  23      * @var string Relevant character used by this syntax
  24      */
  25      protected $syntaxChar;
  26      
  27      /**
  28      * @var string Name of the tag used by this pass
  29      */
  30      protected $tagName;
  31  
  32      /**
  33      * @param  string $tagName     Name of the tag used by this pass
  34      * @param  string $syntaxChar  Relevant character used by this syntax
  35      * @param  string $shortRegexp Regexp used for the short form syntax
  36      * @param  string $longRegexp  Regexp used for the long form syntax
  37      * @return void
  38      */
  39  	protected function parseAbstractScript($tagName, $syntaxChar, $shortRegexp, $longRegexp)
  40      {
  41          $this->tagName     = $tagName;
  42          $this->syntaxChar  = $syntaxChar;
  43          $this->shortRegexp = $shortRegexp;
  44          $this->longRegexp  = $longRegexp;
  45  
  46          $pos = $this->text->indexOf($this->syntaxChar);
  47          if ($pos === false)
  48          {
  49              return;
  50          }
  51  
  52          $this->parseShortForm($pos);
  53          $this->parseLongForm($pos);
  54      }
  55  
  56      /**
  57      * Parse the long form x^(x)
  58      *
  59      * This syntax is supported by RDiscount
  60      *
  61      * @param  integer $pos Position of the first relevant character
  62      * @return void
  63      */
  64  	protected function parseLongForm($pos)
  65      {
  66          $pos = $this->text->indexOf($this->syntaxChar . '(', $pos);
  67          if ($pos === false)
  68          {
  69              return;
  70          }
  71  
  72          preg_match_all($this->longRegexp, $this->text, $matches, PREG_OFFSET_CAPTURE, $pos);
  73          foreach ($matches[0] as list($match, $matchPos))
  74          {
  75              $matchLen = strlen($match);
  76  
  77              $this->parser->addTagPair($this->tagName, $matchPos, 2, $matchPos + $matchLen - 1, 1);
  78              $this->text->overwrite($matchPos, $matchLen);
  79          }
  80          if (!empty($matches[0]))
  81          {
  82              $this->parseLongForm($pos);
  83          }
  84      }
  85  
  86      /**
  87      * Parse the short form x^x and x^x^
  88      *
  89      * This syntax is supported by most implementations that support superscript
  90      *
  91      * @param  integer $pos Position of the first relevant character
  92      * @return void
  93      */
  94  	protected function parseShortForm($pos)
  95      {
  96          preg_match_all($this->shortRegexp, $this->text, $matches, PREG_OFFSET_CAPTURE, $pos);
  97          foreach ($matches[0] as list($match, $matchPos))
  98          {
  99              $matchLen = strlen($match);
 100              $startPos = $matchPos;
 101              $endLen   = (substr($match, -1) === $this->syntaxChar) ? 1 : 0;
 102              $endPos   = $matchPos + $matchLen - $endLen;
 103  
 104              $this->parser->addTagPair($this->tagName, $startPos, 1, $endPos, $endLen);
 105          }
 106      }
 107  }