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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\Mention;
use League\CommonMark\Extension\Mention\Generator\CallbackGenerator;
use League\CommonMark\Extension\Mention\Generator\MentionGeneratorInterface;
use League\CommonMark\Extension\Mention\Generator\StringTemplateLinkGenerator;
use League\CommonMark\Inline\Parser\InlineParserInterface;
use League\CommonMark\InlineParserContext;
final class MentionParser implements InlineParserInterface
{
/** @var string */
private $symbol;
/** @var string */
private $mentionRegex;
/** @var MentionGeneratorInterface */
private $mentionGenerator;
public function __construct(string $symbol, string $mentionRegex, MentionGeneratorInterface $mentionGenerator)
{
$this->symbol = $symbol;
$this->mentionRegex = $mentionRegex;
$this->mentionGenerator = $mentionGenerator;
}
public function getCharacters(): array
{
return [$this->symbol];
}
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 mention match value
$identifier = $cursor->match($this->mentionRegex);
if ($identifier === null) {
// Regex failed to match; this isn't a valid mention
$cursor->restoreState($previousState);
return false;
}
$mention = $this->mentionGenerator->generateMention(new Mention($this->symbol, $identifier));
if ($mention === null) {
$cursor->restoreState($previousState);
return false;
}
$inlineContext->getContainer()->appendChild($mention);
return true;
}
public static function createWithStringTemplate(string $symbol, string $mentionRegex, string $urlTemplate): MentionParser
{
return new self($symbol, $mentionRegex, new StringTemplateLinkGenerator($urlTemplate));
}
public static function createWithCallback(string $symbol, string $mentionRegex, callable $callback): MentionParser
{
return new self($symbol, $mentionRegex, new CallbackGenerator($callback));
}
}
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