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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\Inline\Parser;
use League\CommonMark\Cursor;
use League\CommonMark\Delimiter\DelimiterInterface;
use League\CommonMark\EnvironmentAwareInterface;
use League\CommonMark\EnvironmentInterface;
use League\CommonMark\Inline\AdjacentTextMerger;
use League\CommonMark\Inline\Element\AbstractWebResource;
use League\CommonMark\Inline\Element\Image;
use League\CommonMark\Inline\Element\Link;
use League\CommonMark\InlineParserContext;
use League\CommonMark\Reference\ReferenceInterface;
use League\CommonMark\Reference\ReferenceMapInterface;
use League\CommonMark\Util\LinkParserHelper;
use League\CommonMark\Util\RegexHelper;
final class CloseBracketParser implements InlineParserInterface, EnvironmentAwareInterface
{
/**
* @var EnvironmentInterface
*/
private $environment;
/**
* @return string[]
*/
public function getCharacters(): array
{
return [']'];
}
/**
* @param InlineParserContext $inlineContext
*
* @return bool
*/
public function parse(InlineParserContext $inlineContext): bool
{
// Look through stack of delimiters for a [ or !
$opener = $inlineContext->getDelimiterStack()->searchByCharacter(['[', '!']);
if ($opener === null) {
return false;
}
if (!$opener->isActive()) {
// no matched opener; remove from emphasis stack
$inlineContext->getDelimiterStack()->removeDelimiter($opener);
return false;
}
$cursor = $inlineContext->getCursor();
$startPos = $cursor->getPosition();
$previousState = $cursor->saveState();
$cursor->advance();
// Check to see if we have a link/image
if (!($link = $this->tryParseLink($cursor, $inlineContext->getReferenceMap(), $opener, $startPos))) {
// No match
$inlineContext->getDelimiterStack()->removeDelimiter($opener); // Remove this opener from stack
$cursor->restoreState($previousState);
return false;
}
$isImage = $opener->getChar() === '!';
$inline = $this->createInline($link['url'], $link['title'], $isImage);
$opener->getInlineNode()->replaceWith($inline);
while (($label = $inline->next()) !== null) {
$inline->appendChild($label);
}
// Process delimiters such as emphasis inside link/image
$delimiterStack = $inlineContext->getDelimiterStack();
$stackBottom = $opener->getPrevious();
$delimiterStack->processDelimiters($stackBottom, $this->environment->getDelimiterProcessors());
$delimiterStack->removeAll($stackBottom);
// Merge any adjacent Text nodes together
AdjacentTextMerger::mergeChildNodes($inline);
// processEmphasis will remove this and later delimiters.
// Now, for a link, we also remove earlier link openers (no links in links)
if (!$isImage) {
$inlineContext->getDelimiterStack()->removeEarlierMatches('[');
}
return true;
}
/**
* @param EnvironmentInterface $environment
*/
public function setEnvironment(EnvironmentInterface $environment)
{
$this->environment = $environment;
}
/**
* @param Cursor $cursor
* @param ReferenceMapInterface $referenceMap
* @param DelimiterInterface $opener
* @param int $startPos
*
* @return array|bool
*/
private function tryParseLink(Cursor $cursor, ReferenceMapInterface $referenceMap, DelimiterInterface $opener, int $startPos)
{
// Check to see if we have a link/image
// Inline link?
if ($result = $this->tryParseInlineLinkAndTitle($cursor)) {
return $result;
}
if ($link = $this->tryParseReference($cursor, $referenceMap, $opener, $startPos)) {
return ['url' => $link->getDestination(), 'title' => $link->getTitle()];
}
return false;
}
/**
* @param Cursor $cursor
*
* @return array|bool
*/
private function tryParseInlineLinkAndTitle(Cursor $cursor)
{
if ($cursor->getCharacter() !== '(') {
return false;
}
$previousState = $cursor->saveState();
$cursor->advance();
$cursor->advanceToNextNonSpaceOrNewline();
if (($dest = LinkParserHelper::parseLinkDestination($cursor)) === null) {
$cursor->restoreState($previousState);
return false;
}
$cursor->advanceToNextNonSpaceOrNewline();
$title = '';
// make sure there's a space before the title:
if (\preg_match(RegexHelper::REGEX_WHITESPACE_CHAR, $cursor->peek(-1))) {
$title = LinkParserHelper::parseLinkTitle($cursor) ?? '';
}
$cursor->advanceToNextNonSpaceOrNewline();
if ($cursor->match('/^\\)/') === null) {
$cursor->restoreState($previousState);
return false;
}
return ['url' => $dest, 'title' => $title];
}
/**
* @param Cursor $cursor
* @param ReferenceMapInterface $referenceMap
* @param DelimiterInterface $opener
* @param int $startPos
*
* @return ReferenceInterface|null
*/
private function tryParseReference(Cursor $cursor, ReferenceMapInterface $referenceMap, DelimiterInterface $opener, int $startPos): ?ReferenceInterface
{
if ($opener->getIndex() === null) {
return null;
}
$savePos = $cursor->saveState();
$beforeLabel = $cursor->getPosition();
$n = LinkParserHelper::parseLinkLabel($cursor);
if ($n === 0 || $n === 2) {
$start = $opener->getIndex();
$length = $startPos - $opener->getIndex();
} else {
$start = $beforeLabel + 1;
$length = $n - 2;
}
$referenceLabel = $cursor->getSubstring($start, $length);
if ($n === 0) {
// If shortcut reference link, rewind before spaces we skipped
$cursor->restoreState($savePos);
}
return $referenceMap->getReference($referenceLabel);
}
/**
* @param string $url
* @param string $title
* @param bool $isImage
*
* @return AbstractWebResource
*/
private function createInline(string $url, string $title, bool $isImage): AbstractWebResource
{
if ($isImage) {
return new Image($url, null, $title);
}
return new Link($url, null, $title);
}
}
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