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<?php |
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declare(strict_types=1); |
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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\Extension\CommonMark\Parser\Inline; |
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use League\CommonMark\Extension\CommonMark\Node\Inline\Code; |
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use League\CommonMark\Node\Inline\Text; |
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use League\CommonMark\Parser\Cursor; |
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use League\CommonMark\Parser\Inline\InlineParserInterface; |
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use League\CommonMark\Parser\Inline\InlineParserMatch; |
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use League\CommonMark\Parser\InlineParserContext; |
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final class BacktickParser implements InlineParserInterface |
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{ |
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/** |
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* Max bound for backtick code span delimiters. |
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* |
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* @see https://github.com/commonmark/cmark/commit/8ed5c9d |
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*/ |
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private const MAX_BACKTICKS = 1000; |
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/** @var \WeakReference<Cursor>|null */ |
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private ?\WeakReference $lastCursor = null; |
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private bool $lastCursorScanned = false; |
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/** @var array<int, int> backtick count => position of known ender */ |
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private array $seenBackticks = []; |
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2304 |
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public function getMatchDefinition(): InlineParserMatch |
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{ |
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2304 |
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return InlineParserMatch::regex('`+'); |
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} |
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public function parse(InlineParserContext $inlineContext): bool |
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{ |
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$ticks = $inlineContext->getFullMatch(); |
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$cursor = $inlineContext->getCursor(); |
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$cursor->advanceBy($inlineContext->getFullMatchLength()); |
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$currentPosition = $cursor->getPosition(); |
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$previousState = $cursor->saveState(); |
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if ($this->findMatchingTicks(\strlen($ticks), $cursor)) { |
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$code = $cursor->getSubstring($currentPosition, $cursor->getPosition() - $currentPosition - \strlen($ticks)); |
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$c = \preg_replace('/\n/m', ' ', $code) ?? ''; |
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if ( |
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$c !== '' && |
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$c[0] === ' ' && |
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\substr($c, -1, 1) === ' ' && |
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\preg_match('/[^ ]/', $c) |
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) { |
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$c = \substr($c, 1, -1); |
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} |
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$inlineContext->getContainer()->appendChild(new Code($c)); |
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return true; |
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} |
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// If we got here, we didn't match a closing backtick sequence |
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$cursor->restoreState($previousState); |
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$inlineContext->getContainer()->appendChild(new Text($ticks)); |
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return true; |
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} |
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/** |
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* Locates the matching closer for a backtick code span. |
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* |
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* Leverages some caching to avoid traversing the same cursor multiple times when |
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* we've already seen all the potential backtick closers. |
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* |
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* @see https://github.com/commonmark/cmark/commit/8ed5c9d |
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* |
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* @param int $openTickLength Number of backticks in the opening sequence |
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* @param Cursor $cursor Cursor to scan |
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* |
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* @return bool True if a matching closer was found, false otherwise |
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*/ |
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private function findMatchingTicks(int $openTickLength, Cursor $cursor): bool |
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{ |
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// Reset the seenBackticks cache if this is a new cursor |
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if ($this->lastCursor === null || $this->lastCursor->get() !== $cursor) { |
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$this->seenBackticks = []; |
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$this->lastCursor = \WeakReference::create($cursor); |
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$this->lastCursorScanned = false; |
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} |
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if ($openTickLength > self::MAX_BACKTICKS) { |
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return false; |
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} |
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// Return if we already know there's no closer |
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if ($this->lastCursorScanned && isset($this->seenBackticks[$openTickLength]) && $this->seenBackticks[$openTickLength] <= $cursor->getPosition()) { |
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return false; |
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} |
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while ($ticks = $cursor->match('/`{1,' . self::MAX_BACKTICKS . '}/m')) { |
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$numTicks = \strlen($ticks); |
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// Did we find the closer? |
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if ($numTicks === $openTickLength) { |
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return true; |
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} |
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// Store position of closer |
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if ($numTicks <= self::MAX_BACKTICKS) { |
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$this->seenBackticks[$numTicks] = $cursor->getPosition() - $numTicks; |
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} |
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} |
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// Got through whole input without finding closer |
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$this->lastCursorScanned = true; |
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return false; |
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} |
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} |
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thephpleague /
commonmark
