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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
* - (c) John MacFarlane
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Reference;
use League\CommonMark\Cursor;
use League\CommonMark\Util\LinkParserHelper;
final class ReferenceParser
{
/**
* @var ReferenceMapInterface
*/
private $referenceMap;
public function __construct(ReferenceMapInterface $referenceMap)
{
$this->referenceMap = $referenceMap;
}
/**
* 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->advanceBy(1);
// Link URL
$cursor->advanceToNextNonSpaceOrNewline();
$destination = LinkParserHelper::parseLinkDestination($cursor);
if ($destination === null) {
$cursor->restoreState($initialState);
return false;
}
$previousState = $cursor->saveState();
if ($cursor->advanceToNextNonSpaceOrNewline() > 0) {
$title = LinkParserHelper::parseLinkTitle($cursor);
}
if (!isset($title)) {
$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;
}
}
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