예제 #1
0
 /**
  * Attempt to parse a link reference, modifying the refmap.
  *
  * @param Cursor $cursor
  *
  * @return bool
  */
 public function parse(Cursor $cursor)
 {
     if ($cursor->isAtEnd()) {
         return false;
     }
     $initialState = $cursor->saveState();
     $matchChars = LinkParserHelper::parseLinkLabel($cursor);
     if ($matchChars === 0) {
         $cursor->restoreState($initialState);
         return false;
     }
     // We need to trim the opening and closing brackets from the previously-matched text
     $label = substr($cursor->getPreviousText(), 1, -1);
     if (preg_match('/[^\\s]/', $label) === 0) {
         $cursor->restoreState($initialState);
         return false;
     }
     if ($cursor->getCharacter() !== ':') {
         $cursor->restoreState($initialState);
         return false;
     }
     // Advance past the colon
     $cursor->advance();
     // Link URL
     $cursor->advanceToFirstNonSpace();
     $destination = LinkParserHelper::parseLinkDestination($cursor);
     if (empty($destination)) {
         $cursor->restoreState($initialState);
         return false;
     }
     $previousState = $cursor->saveState();
     $cursor->advanceToFirstNonSpace();
     $title = LinkParserHelper::parseLinkTitle($cursor);
     if ($title === null) {
         $title = '';
         $cursor->restoreState($previousState);
     }
     // Make sure we're at line end:
     if ($cursor->match('/^ *(?:\\n|$)/') === null) {
         $cursor->restoreState($initialState);
         return false;
     }
     if (!$this->referenceMap->contains($label)) {
         $reference = new Reference($label, $destination, $title);
         $this->referenceMap->addReference($reference);
     }
     return true;
 }
예제 #2
0
 /**
  * @param Cursor $cursor
  * @param ReferenceMap $referenceMap
  * @param Delimiter $opener
  * @param int $startPos
  *
  * @return Reference|null
  */
 protected function tryParseReference(Cursor $cursor, ReferenceMap $referenceMap, Delimiter $opener, $startPos)
 {
     $savePos = $cursor->saveState();
     $cursor->advanceToFirstNonSpace();
     $beforeLabel = $cursor->getPosition();
     $n = LinkParserHelper::parseLinkLabel($cursor);
     if ($n === 0 || $n === 2) {
         // Empty or missing second label
         $reflabel = mb_substr($cursor->getLine(), $opener->getIndex(), $startPos - $opener->getIndex(), 'utf-8');
     } else {
         $reflabel = mb_substr($cursor->getLine(), $beforeLabel + 1, $n - 2, 'utf-8');
     }
     if ($n === 0) {
         // If shortcut reference link, rewind before spaces we skipped
         $cursor->restoreState($savePos);
     }
     return $referenceMap->getReference($reflabel);
 }
 /**
  * Attempt to parse a link reference, modifying the refmap.
  *
  * @param Cursor $cursor
  *
  * @return bool
  */
 public function parse(Cursor $cursor)
 {
     if ($cursor->isAtEnd()) {
         return false;
     }
     $initialState = $cursor->saveState();
     $matchChars = LinkParserHelper::parseLinkLabel($cursor);
     if ($matchChars === 0) {
         $cursor->restoreState($initialState);
         return false;
     }
     // We need to trim the opening and closing brackets from the previously-matched text
     $label = substr($cursor->getPreviousText(), 1, -1);
     if (preg_match('/[^\\s]/', $label) === 0) {
         $cursor->restoreState($initialState);
         return false;
     }
     if ($cursor->getCharacter() !== ':') {
         $cursor->restoreState($initialState);
         return false;
     }
     // Advance past the colon
     $cursor->advance();
     // Link URL
     $cursor->advanceToFirstNonSpace();
     $destination = LinkParserHelper::parseLinkDestination($cursor);
     if (empty($destination)) {
         $cursor->restoreState($initialState);
         return false;
     }
     $previousState = $cursor->saveState();
     $cursor->advanceToFirstNonSpace();
     $title = LinkParserHelper::parseLinkTitle($cursor);
     if ($title === null) {
         $title = '';
         $cursor->restoreState($previousState);
     }
     // Make sure we're at line end:
     $atLineEnd = true;
     if ($cursor->match('/^ *(?:\\n|$)/') === null) {
         if ($title === '') {
             $atLineEnd = false;
         } else {
             // The potential title we found is not at the line end,
             // but it could still be a legal link reference if we
             // discard the title
             $title = '';
             // rewind before spaces
             $cursor->restoreState($previousState);
             // and instead check if the link URL is at the line end
             $atLineEnd = $cursor->match('/^ *(?:\\n|$)/') !== null;
         }
     }
     if (!$atLineEnd) {
         $cursor->restoreState($initialState);
         return false;
     }
     if (!$this->referenceMap->contains($label)) {
         $reference = new Reference($label, $destination, $title);
         $this->referenceMap->addReference($reference);
     }
     return true;
 }