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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  use s9e\TextFormatter\Parser as Rules;
  10  class Blocks extends AbstractPass
  11  {
  12      protected $setextLines = [];
  13  	public function parse()
  14      {
  15          $this->matchSetextLines();
  16          $codeFence    = \null;
  17          $codeIndent   = 4;
  18          $codeTag      = \null;
  19          $lineIsEmpty  = \true;
  20          $lists        = [];
  21          $listsCnt     = 0;
  22          $newContext   = \false;
  23          $quotes       = [];
  24          $quotesCnt    = 0;
  25          $textBoundary = 0;
  26          $regexp = '/^(?:(?=[-*+\\d \\t>`~#_])((?: {0,3}> ?)+)?([ \\t]+)?(\\* *\\* *\\*[* ]*$|- *- *-[- ]*$|_ *_ *_[_ ]*$|=+$)?((?:[-*+]|\\d+\\.)[ \\t]+(?=\\S))?[ \\t]*(#{1,6}[ \\t]+|```+[^`\\n]*$|~~~+[^~\\n]*$)?)?/m';
  27          \preg_match_all($regexp, $this->text, $matches, \PREG_OFFSET_CAPTURE | \PREG_SET_ORDER);
  28          foreach ($matches as $m)
  29          {
  30              $matchPos   = $m[0][1];
  31              $matchLen   = \strlen($m[0][0]);
  32              $ignoreLen  = 0;
  33              $quoteDepth = 0;
  34              $continuation = !$lineIsEmpty;
  35              $lfPos       = $this->text->indexOf("\n", $matchPos);
  36              $lineIsEmpty = ($lfPos === $matchPos + $matchLen && empty($m[3][0]) && empty($m[4][0]) && empty($m[5][0]));
  37              $breakParagraph = ($lineIsEmpty && $continuation);
  38              if (!empty($m[1][0]))
  39              {
  40                  $quoteDepth = \substr_count($m[1][0], '>');
  41                  $ignoreLen  = \strlen($m[1][0]);
  42                  if (isset($codeTag) && $codeTag->hasAttribute('quoteDepth'))
  43                  {
  44                      $quoteDepth = \min($quoteDepth, $codeTag->getAttribute('quoteDepth'));
  45                      $ignoreLen  = $this->computeQuoteIgnoreLen($m[1][0], $quoteDepth);
  46                  }
  47                  $this->text->overwrite($matchPos, $ignoreLen);
  48              }
  49              if ($quoteDepth < $quotesCnt && !$continuation)
  50              {
  51                  $newContext = \true;
  52                  do
  53                  {
  54                      $this->parser->addEndTag('QUOTE', $textBoundary, 0)
  55                                   ->pairWith(\array_pop($quotes));
  56                  }
  57                  while ($quoteDepth < --$quotesCnt);
  58              }
  59              if ($quoteDepth > $quotesCnt && !$lineIsEmpty)
  60              {
  61                  $newContext = \true;
  62                  do
  63                  {
  64                      $tag = $this->parser->addStartTag('QUOTE', $matchPos, 0, $quotesCnt - 999);
  65                      $quotes[] = $tag;
  66                  }
  67                  while ($quoteDepth > ++$quotesCnt);
  68              }
  69              $indentWidth = 0;
  70              $indentPos   = 0;
  71              if (!empty($m[2][0]) && !$codeFence)
  72              {
  73                  $indentStr = $m[2][0];
  74                  $indentLen = \strlen($indentStr);
  75                  do
  76                  {
  77                      if ($indentStr[$indentPos] === ' ')
  78                          ++$indentWidth;
  79                      else
  80                          $indentWidth = ($indentWidth + 4) & ~3;
  81                  }
  82                  while (++$indentPos < $indentLen && $indentWidth < $codeIndent);
  83              }
  84              if (isset($codeTag) && !$codeFence && $indentWidth < $codeIndent && !$lineIsEmpty)
  85                  $newContext = \true;
  86              if ($newContext)
  87              {
  88                  $newContext = \false;
  89                  if (isset($codeTag))
  90                  {
  91                      if ($textBoundary > $codeTag->getPos())
  92                      {
  93                          $this->text->overwrite($codeTag->getPos(), $textBoundary - $codeTag->getPos());
  94                          $endTag = $this->parser->addEndTag('CODE', $textBoundary, 0, -1);
  95                          $endTag->pairWith($codeTag);
  96                      }
  97                      else
  98                          $codeTag->invalidate();
  99                      $codeTag = \null;
 100                      $codeFence = \null;
 101                  }
 102                  foreach ($lists as $list)
 103                      $this->closeList($list, $textBoundary);
 104                  $lists    = [];
 105                  $listsCnt = 0;
 106                  if ($matchPos)
 107                      $this->text->markBoundary($matchPos - 1);
 108              }
 109              if ($indentWidth >= $codeIndent)
 110              {
 111                  if (isset($codeTag) || !$continuation)
 112                  {
 113                      $ignoreLen += $indentPos;
 114                      if (!isset($codeTag))
 115                          $codeTag = $this->parser->addStartTag('CODE', $matchPos + $ignoreLen, 0, -999);
 116                      $m = [];
 117                  }
 118              }
 119              else
 120              {
 121                  $hasListItem = !empty($m[4][0]);
 122                  if (!$indentWidth && !$continuation && !$hasListItem)
 123                      $listIndex = -1;
 124                  elseif ($continuation && !$hasListItem)
 125                      $listIndex = $listsCnt - 1;
 126                  elseif (!$listsCnt)
 127                      $listIndex = ($hasListItem) ? 0 : -1;
 128                  else
 129                  {
 130                      $listIndex = 0;
 131                      while ($listIndex < $listsCnt && $indentWidth > $lists[$listIndex]['maxIndent'])
 132                          ++$listIndex;
 133                  }
 134                  while ($listIndex < $listsCnt - 1)
 135                  {
 136                      $this->closeList(\array_pop($lists), $textBoundary);
 137                      --$listsCnt;
 138                  }
 139                  if ($listIndex === $listsCnt && !$hasListItem)
 140                      --$listIndex;
 141                  if ($hasListItem && $listIndex >= 0)
 142                  {
 143                      $breakParagraph = \true;
 144                      $tagPos = $matchPos + $ignoreLen + $indentPos;
 145                      $tagLen = \strlen($m[4][0]);
 146                      $itemTag = $this->parser->addStartTag('LI', $tagPos, $tagLen);
 147                      $this->text->overwrite($tagPos, $tagLen);
 148                      if ($listIndex < $listsCnt)
 149                      {
 150                          $this->parser->addEndTag('LI', $textBoundary, 0)
 151                                       ->pairWith($lists[$listIndex]['itemTag']);
 152                          $lists[$listIndex]['itemTag']    = $itemTag;
 153                          $lists[$listIndex]['itemTags'][] = $itemTag;
 154                      }
 155                      else
 156                      {
 157                          ++$listsCnt;
 158                          if ($listIndex)
 159                          {
 160                              $minIndent = $lists[$listIndex - 1]['maxIndent'] + 1;
 161                              $maxIndent = \max($minIndent, $listIndex * 4);
 162                          }
 163                          else
 164                          {
 165                              $minIndent = 0;
 166                              $maxIndent = $indentWidth;
 167                          }
 168                          $listTag = $this->parser->addStartTag('LIST', $tagPos, 0);
 169                          if (\strpos($m[4][0], '.') !== \false)
 170                          {
 171                              $listTag->setAttribute('type', 'decimal');
 172                              $start = (int) $m[4][0];
 173                              if ($start !== 1)
 174                                  $listTag->setAttribute('start', $start);
 175                          }
 176                          $lists[] = [
 177                              'listTag'   => $listTag,
 178                              'itemTag'   => $itemTag,
 179                              'itemTags'  => [$itemTag],
 180                              'minIndent' => $minIndent,
 181                              'maxIndent' => $maxIndent,
 182                              'tight'     => \true
 183                          ];
 184                      }
 185                  }
 186                  if ($listsCnt && !$continuation && !$lineIsEmpty)
 187                      if (\count($lists[0]['itemTags']) > 1 || !$hasListItem)
 188                      {
 189                          foreach ($lists as &$list)
 190                              $list['tight'] = \false;
 191                          unset($list);
 192                      }
 193                  $codeIndent = ($listsCnt + 1) * 4;
 194              }
 195              if (isset($m[5]))
 196              {
 197                  if ($m[5][0][0] === '#')
 198                  {
 199                      $startLen = \strlen($m[5][0]);
 200                      $startPos = $matchPos + $matchLen - $startLen;
 201                      $endLen   = $this->getAtxHeaderEndTagLen($matchPos + $matchLen, $lfPos);
 202                      $endPos   = $lfPos - $endLen;
 203                      $this->parser->addTagPair('H' . \strspn($m[5][0], '#', 0, 6), $startPos, $startLen, $endPos, $endLen);
 204                      $this->text->markBoundary($startPos);
 205                      $this->text->markBoundary($lfPos);
 206                      if ($continuation)
 207                          $breakParagraph = \true;
 208                  }
 209                  elseif ($m[5][0][0] === '`' || $m[5][0][0] === '~')
 210                  {
 211                      $tagPos = $matchPos + $ignoreLen;
 212                      $tagLen = $lfPos - $tagPos;
 213                      if (isset($codeTag) && $m[5][0] === $codeFence)
 214                      {
 215                          $endTag = $this->parser->addEndTag('CODE', $tagPos, $tagLen, -1);
 216                          $endTag->pairWith($codeTag);
 217                          $this->parser->addIgnoreTag($textBoundary, $tagPos - $textBoundary);
 218                          $this->text->overwrite($codeTag->getPos(), $tagPos + $tagLen - $codeTag->getPos());
 219                          $codeTag = \null;
 220                          $codeFence = \null;
 221                      }
 222                      elseif (!isset($codeTag))
 223                      {
 224                          $codeTag   = $this->parser->addStartTag('CODE', $tagPos, $tagLen);
 225                          $codeFence = \substr($m[5][0], 0, \strspn($m[5][0], '`~'));
 226                          $codeTag->setAttribute('quoteDepth', $quoteDepth);
 227                          $this->parser->addIgnoreTag($tagPos + $tagLen, 1);
 228                          $lang = \trim(\trim($m[5][0], '`~'));
 229                          if ($lang !== '')
 230                              $codeTag->setAttribute('lang', $lang);
 231                      }
 232                  }
 233              }
 234              elseif (!empty($m[3][0]) && !$listsCnt && $this->text->charAt($matchPos + $matchLen) !== "\x17")
 235              {
 236                  $this->parser->addSelfClosingTag('HR', $matchPos + $ignoreLen, $matchLen - $ignoreLen);
 237                  $breakParagraph = \true;
 238                  $this->text->markBoundary($lfPos);
 239              }
 240              elseif (isset($this->setextLines[$lfPos]) && $this->setextLines[$lfPos]['quoteDepth'] === $quoteDepth && !$lineIsEmpty && !$listsCnt && !isset($codeTag))
 241              {
 242                  $this->parser->addTagPair(
 243                      $this->setextLines[$lfPos]['tagName'],
 244                      $matchPos + $ignoreLen,
 245                      0,
 246                      $this->setextLines[$lfPos]['endPos'],
 247                      $this->setextLines[$lfPos]['endLen']
 248                  );
 249                  $this->text->markBoundary($this->setextLines[$lfPos]['endPos'] + $this->setextLines[$lfPos]['endLen']);
 250              }
 251              if ($breakParagraph)
 252              {
 253                  $this->parser->addParagraphBreak($textBoundary);
 254                  $this->text->markBoundary($textBoundary);
 255              }
 256              if (!$lineIsEmpty)
 257                  $textBoundary = $lfPos;
 258              if ($ignoreLen)
 259                  $this->parser->addIgnoreTag($matchPos, $ignoreLen, 1000);
 260          }
 261      }
 262  	protected function closeList(array $list, $textBoundary)
 263      {
 264          $this->parser->addEndTag('LIST', $textBoundary, 0)->pairWith($list['listTag']);
 265          $this->parser->addEndTag('LI',   $textBoundary, 0)->pairWith($list['itemTag']);
 266          if ($list['tight'])
 267              foreach ($list['itemTags'] as $itemTag)
 268                  $itemTag->removeFlags(Rules::RULE_CREATE_PARAGRAPHS);
 269      }
 270  	protected function computeQuoteIgnoreLen($str, $maxQuoteDepth)
 271      {
 272          $remaining = $str;
 273          while (--$maxQuoteDepth >= 0)
 274              $remaining = \preg_replace('/^ *> ?/', '', $remaining);
 275          return \strlen($str) - \strlen($remaining);
 276      }
 277  	protected function getAtxHeaderEndTagLen($startPos, $endPos)
 278      {
 279          $content = \substr($this->text, $startPos, $endPos - $startPos);
 280          \preg_match('/[ \\t]*#*[ \\t]*$/', $content, $m);
 281          return \strlen($m[0]);
 282      }
 283  	protected function matchSetextLines()
 284      {
 285          if ($this->text->indexOf('-') === \false && $this->text->indexOf('=') === \false)
 286              return;
 287          $regexp = '/^(?=[-=>])(?:> ?)*(?=[-=])(?:-+|=+) *$/m';
 288          if (!\preg_match_all($regexp, $this->text, $matches, \PREG_OFFSET_CAPTURE))
 289              return;
 290          foreach ($matches[0] as $_4b034d25)
 291          {
 292              list($match, $matchPos) = $_4b034d25;
 293              $endPos = $matchPos - 1;
 294              while ($endPos > 0 && $this->text->charAt($endPos - 1) === ' ')
 295                  --$endPos;
 296              $this->setextLines[$matchPos - 1] = [
 297                  'endLen'     => $matchPos + \strlen($match) - $endPos,
 298                  'endPos'     => $endPos,
 299                  'quoteDepth' => \substr_count($match, '>'),
 300                  'tagName'    => ($match[0] === '=') ? 'H1' : 'H2'
 301              ];
 302          }
 303      }
 304  }