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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  class InlineCode extends AbstractPass
  11  {
  12      /**
  13      * {@inheritdoc}
  14      */
  15  	public function parse()
  16      {
  17          $markers = $this->getInlineCodeMarkers();
  18          $i       = -1;
  19          $cnt     = count($markers);
  20          while (++$i < ($cnt - 1))
  21          {
  22              $pos = $markers[$i]['next'];
  23              $j   = $i;
  24              if ($this->text->charAt($markers[$i]['pos']) !== '`')
  25              {
  26                  // Adjust the left marker if its first backtick was escaped
  27                  ++$markers[$i]['pos'];
  28                  --$markers[$i]['len'];
  29              }
  30              while (++$j < $cnt && $markers[$j]['pos'] === $pos)
  31              {
  32                  if ($markers[$j]['len'] === $markers[$i]['len'])
  33                  {
  34                      $this->addInlineCodeTags($markers[$i], $markers[$j]);
  35                      $i = $j;
  36                      break;
  37                  }
  38                  $pos = $markers[$j]['next'];
  39              }
  40          }
  41      }
  42  
  43      /**
  44      * Add the tag pair for an inline code span
  45      *
  46      * @param  array $left  Left marker
  47      * @param  array $right Right marker
  48      * @return void
  49      */
  50  	protected function addInlineCodeTags($left, $right)
  51      {
  52          $startPos = $left['pos'];
  53          $startLen = $left['len'] + $left['trimAfter'];
  54          $endPos   = $right['pos'] - $right['trimBefore'];
  55          $endLen   = $right['len'] + $right['trimBefore'];
  56          $this->parser->addTagPair('C', $startPos, $startLen, $endPos, $endLen);
  57          $this->text->overwrite($startPos, $endPos + $endLen - $startPos);
  58      }
  59  
  60      /**
  61      * Capture and return inline code markers
  62      *
  63      * @return array
  64      */
  65  	protected function getInlineCodeMarkers()
  66      {
  67          $pos = $this->text->indexOf('`');
  68          if ($pos === false)
  69          {
  70              return [];
  71          }
  72  
  73          preg_match_all(
  74              '/(`+)(\\s*)[^\\x17`]*/',
  75              str_replace("\x1BD", '\\`', $this->text),
  76              $matches,
  77              PREG_OFFSET_CAPTURE | PREG_SET_ORDER,
  78              $pos
  79          );
  80          $trimNext = 0;
  81          $markers  = [];
  82          foreach ($matches as $m)
  83          {
  84              $markers[] = [
  85                  'pos'        => $m[0][1],
  86                  'len'        => strlen($m[1][0]),
  87                  'trimBefore' => $trimNext,
  88                  'trimAfter'  => strlen($m[2][0]),
  89                  'next'       => $m[0][1] + strlen($m[0][0])
  90              ];
  91              $trimNext = strlen($m[0][0]) - strlen(rtrim($m[0][0]));
  92          }
  93  
  94          return $markers;
  95      }
  96  }