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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Extension\Autolink;
use League\CommonMark\Inline\Element\Link;
use League\CommonMark\Inline\Parser\InlineParserInterface;
use League\CommonMark\InlineParserContext;
final class InlineMentionParser implements InlineParserInterface
{
/** @var string */
private $linkPattern;
/** @var string */
private $handleRegex;
/**
* @param string $linkPattern
* @param string $handleRegex
*/
public function __construct($linkPattern, $handleRegex = '/^[A-Za-z0-9_]+(?!\w)/')
{
$this->linkPattern = $linkPattern;
$this->handleRegex = $handleRegex;
}
public function getCharacters(): array
{
return ['@'];
}
public function parse(InlineParserContext $inlineContext): bool
{
$cursor = $inlineContext->getCursor();
// The @ symbol must not have any other characters immediately prior
$previousChar = $cursor->peek(-1);
if ($previousChar !== null && $previousChar !== ' ') {
// peek() doesn't modify the cursor, so no need to restore state first
return false;
}
// Save the cursor state in case we need to rewind and bail
$previousState = $cursor->saveState();
// Advance past the @ symbol to keep parsing simpler
$cursor->advance();
// Parse the handle
$handle = $cursor->match($this->handleRegex);
if (empty($handle)) {
// Regex failed to match; this isn't a valid Twitter handle
$cursor->restoreState($previousState);
return false;
}
$url = \sprintf($this->linkPattern, $handle);
$inlineContext->getContainer()->appendChild(new Link($url, '@' . $handle));
return true;
}
/**
* @return InlineMentionParser
*/
public static function createTwitterHandleParser()
{
return new self('https://twitter.com/%s', '/^[A-Za-z0-9_]{1,15}(?!\w)/');
}
/**
* @return InlineMentionParser
*/
public static function createGithubHandleParser()
{
// RegEx adapted from https://github.com/shinnn/github-username-regex/blob/master/index.js
return new self('https://www.github.com/%s', '/^[a-z\d](?:[a-z\d]|-(?=[a-z\d])){0,38}(?!\w)/');
}
}
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