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<?php |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js) |
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* - (c) John MacFarlane |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\CommonMark; |
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use League\CommonMark\Reference\Reference; |
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use League\CommonMark\Reference\ReferenceMap; |
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use League\CommonMark\Util\LinkParserHelper; |
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class ReferenceParser |
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{ |
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/** |
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* @var ReferenceMap |
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*/ |
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protected $referenceMap; |
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public function __construct(ReferenceMap $referenceMap) |
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{ |
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$this->referenceMap = $referenceMap; |
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} |
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/** |
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* Attempt to parse a link reference, modifying the refmap. |
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* |
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* @param Cursor $cursor |
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* |
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* @return bool |
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*/ |
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public function parse(Cursor $cursor) |
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{ |
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if ($cursor->isAtEnd()) { |
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return false; |
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} |
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$initialState = $cursor->saveState(); |
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$matchChars = LinkParserHelper::parseLinkLabel($cursor); |
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if ($matchChars === 0) { |
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$cursor->restoreState($initialState); |
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return false; |
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} |
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// We need to trim the opening and closing brackets from the previously-matched text |
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$label = substr($cursor->getPreviousText(), 1, -1); |
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if (preg_match('/[^\s]/', $label) === 0) { |
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$cursor->restoreState($initialState); |
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return false; |
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} |
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if ($cursor->getCharacter() !== ':') { |
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$cursor->restoreState($initialState); |
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return false; |
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} |
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// Advance past the colon |
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$cursor->advance(); |
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// Link URL |
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$cursor->advanceToNextNonSpaceOrNewline(); |
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$destination = LinkParserHelper::parseLinkDestination($cursor); |
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if (empty($destination)) { |
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$cursor->restoreState($initialState); |
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return false; |
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} |
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$previousState = $cursor->saveState(); |
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$cursor->advanceToNextNonSpaceOrNewline(); |
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$title = LinkParserHelper::parseLinkTitle($cursor); |
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if ($title === null) { |
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$title = ''; |
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$cursor->restoreState($previousState); |
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} |
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// Make sure we're at line end: |
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$atLineEnd = true; |
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if ($cursor->match('/^ *(?:\n|$)/') === null) { |
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if ($title === '') { |
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$atLineEnd = false; |
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} else { |
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// The potential title we found is not at the line end, |
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// but it could still be a legal link reference if we |
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// discard the title |
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$title = ''; |
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// rewind before spaces |
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$cursor->restoreState($previousState); |
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// and instead check if the link URL is at the line end |
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$atLineEnd = $cursor->match('/^ *(?:\n|$)/') !== null; |
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} |
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} |
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if (!$atLineEnd) { |
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$cursor->restoreState($initialState); |
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return false; |
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} |
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if (!$this->referenceMap->contains($label)) { |
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$reference = new Reference($label, $destination, $title); |
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$this->referenceMap->addReference($reference); |
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} |
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return true; |
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} |
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} |
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thephpleague /
commonmark
