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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\Util; |
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use League\CommonMark\Cursor; |
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final class LinkParserHelper |
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{ |
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/** |
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* Attempt to parse link destination |
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* |
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* @param Cursor $cursor |
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* |
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* @return null|string The string, or null if no match |
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*/ |
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public static function parseLinkDestination(Cursor $cursor): ?string |
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{ |
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if ($res = $cursor->match(RegexHelper::REGEX_LINK_DESTINATION_BRACES)) { |
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// Chop off surrounding <..>: |
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return UrlEncoder::unescapeAndEncode( |
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RegexHelper::unescape(\substr($res, 1, -1)) |
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); |
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} |
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if ($cursor->getCharacter() === '<') { |
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return null; |
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} |
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$destination = self::manuallyParseLinkDestination($cursor); |
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if ($destination === null) { |
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return null; |
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} |
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return UrlEncoder::unescapeAndEncode( |
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RegexHelper::unescape($destination) |
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); |
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} |
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/** |
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* @param Cursor $cursor |
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* |
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* @return int |
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*/ |
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public static function parseLinkLabel(Cursor $cursor): int |
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{ |
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$match = $cursor->match('/^\[(?:[^\\\\\[\]]|\\\\.){0,1000}\]/'); |
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if ($match === null) { |
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return 0; |
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} |
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$length = \mb_strlen($match, 'utf-8'); |
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if ($length > 1001) { |
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return 0; |
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} |
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return $length; |
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} |
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/** |
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* Attempt to parse link title (sans quotes) |
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* |
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* @param Cursor $cursor |
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* |
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* @return null|string The string, or null if no match |
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*/ |
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public static function parseLinkTitle(Cursor $cursor): ?string |
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{ |
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if ($title = $cursor->match('/' . RegexHelper::PARTIAL_LINK_TITLE . '/')) { |
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// Chop off quotes from title and unescape |
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return RegexHelper::unescape(\substr($title, 1, -1)); |
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} |
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return null; |
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} |
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/** |
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* @param Cursor $cursor |
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* |
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* @return string|null |
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*/ |
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private static function manuallyParseLinkDestination(Cursor $cursor): ?string |
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{ |
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$oldPosition = $cursor->getPosition(); |
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$oldState = $cursor->saveState(); |
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$openParens = 0; |
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while (($c = $cursor->getCharacter()) !== null) { |
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if ($c === '\\' && $cursor->peek() !== null && RegexHelper::isEscapable($cursor->peek())) { |
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$cursor->advanceBy(2); |
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} elseif ($c === '(') { |
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$cursor->advanceBy(1); |
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$openParens++; |
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} elseif ($c === ')') { |
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if ($openParens < 1) { |
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break; |
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} |
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$cursor->advanceBy(1); |
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$openParens--; |
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} elseif (\preg_match(RegexHelper::REGEX_WHITESPACE_CHAR, $c)) { |
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break; |
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} else { |
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$cursor->advanceBy(1); |
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} |
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} |
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if ($openParens !== 0) { |
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return null; |
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} |
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if ($cursor->getPosition() === $oldPosition && $c !== ')') { |
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return null; |
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} |
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$newPos = $cursor->getPosition(); |
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$cursor->restoreState($oldState); |
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$cursor->advanceBy($newPos - $cursor->getPosition()); |
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return $cursor->getPreviousText(); |
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} |
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} |
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thephpleague /
commonmark
