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   1  <?php
   2  
   3  /*
   4  * @package   s9e\TextFormatter
   5  * @copyright Copyright (c) 2010-2019 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  class Emphasis extends AbstractPass
  10  {
  11      protected $closeEm;
  12      protected $closeStrong;
  13      protected $emPos;
  14      protected $emEndPos;
  15      protected $remaining;
  16      protected $strongPos;
  17      protected $strongEndPos;
  18  	public function parse()
  19      {
  20          $this->parseEmphasisByCharacter('*', '/\\*+/');
  21          $this->parseEmphasisByCharacter('_', '/_+/');
  22      }
  23  	protected function adjustEndingPositions()
  24      {
  25          if ($this->closeEm && $this->closeStrong)
  26              if ($this->emPos < $this->strongPos)
  27                  $this->emEndPos += 2;
  28              else
  29                  ++$this->strongEndPos;
  30      }
  31  	protected function adjustStartingPositions()
  32      {
  33          if (isset($this->emPos) && $this->emPos === $this->strongPos)
  34              if ($this->closeEm)
  35                  $this->emPos += 2;
  36              else
  37                  ++$this->strongPos;
  38      }
  39  	protected function closeSpans()
  40      {
  41          if ($this->closeEm)
  42          {
  43              --$this->remaining;
  44              $this->parser->addTagPair('EM', $this->emPos, 1, $this->emEndPos, 1);
  45              $this->emPos = \null;
  46          }
  47          if ($this->closeStrong)
  48          {
  49              $this->remaining -= 2;
  50              $this->parser->addTagPair('STRONG', $this->strongPos, 2, $this->strongEndPos, 2);
  51              $this->strongPos = \null;
  52          }
  53      }
  54  	protected function parseEmphasisByCharacter($character, $regexp)
  55      {
  56          $pos = $this->text->indexOf($character);
  57          if ($pos === \false)
  58              return;
  59          foreach ($this->getEmphasisByBlock($regexp, $pos) as $block)
  60              $this->processEmphasisBlock($block);
  61      }
  62  	protected function getEmphasisByBlock($regexp, $pos)
  63      {
  64          $block    = [];
  65          $blocks   = [];
  66          $breakPos = $this->text->indexOf("\x17", $pos);
  67          \preg_match_all($regexp, $this->text, $matches, \PREG_OFFSET_CAPTURE, $pos);
  68          foreach ($matches[0] as $m)
  69          {
  70              $matchPos = $m[1];
  71              $matchLen = \strlen($m[0]);
  72              if ($matchPos > $breakPos)
  73              {
  74                  $blocks[] = $block;
  75                  $block    = [];
  76                  $breakPos = $this->text->indexOf("\x17", $matchPos);
  77              }
  78              if (!$this->ignoreEmphasis($matchPos, $matchLen))
  79                  $block[] = [$matchPos, $matchLen];
  80          }
  81          $blocks[] = $block;
  82          return $blocks;
  83      }
  84  	protected function ignoreEmphasis($matchPos, $matchLen)
  85      {
  86          return ($this->text->charAt($matchPos) === '_' && $matchLen === 1 && $this->text->isSurroundedByAlnum($matchPos, $matchLen));
  87      }
  88  	protected function openSpans($pos)
  89      {
  90          if ($this->remaining & 1)
  91              $this->emPos     = $pos - $this->remaining;
  92          if ($this->remaining & 2)
  93              $this->strongPos = $pos - $this->remaining;
  94      }
  95  	protected function processEmphasisBlock(array $block)
  96      {
  97          $this->emPos     = \null;
  98          $this->strongPos = \null;
  99          foreach ($block as $_aab3a45e)
 100          {
 101              list($matchPos, $matchLen) = $_aab3a45e;
 102              $this->processEmphasisMatch($matchPos, $matchLen);
 103          }
 104      }
 105  	protected function processEmphasisMatch($matchPos, $matchLen)
 106      {
 107          $canOpen  = !$this->text->isBeforeWhitespace($matchPos + $matchLen - 1);
 108          $canClose = !$this->text->isAfterWhitespace($matchPos);
 109          $closeLen = ($canClose) ? \min($matchLen, 3) : 0;
 110          $this->closeEm      = ($closeLen & 1) && isset($this->emPos);
 111          $this->closeStrong  = ($closeLen & 2) && isset($this->strongPos);
 112          $this->emEndPos     = $matchPos;
 113          $this->strongEndPos = $matchPos;
 114          $this->remaining    = $matchLen;
 115          $this->adjustStartingPositions();
 116          $this->adjustEndingPositions();
 117          $this->closeSpans();
 118          $this->remaining = ($canOpen) ? \min($this->remaining, 3) : 0;
 119          $this->openSpans($matchPos + $matchLen);
 120      }
 121  }