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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\Reference;
final class Reference implements ReferenceInterface
{
/**
* @var string
*/
protected $label;
/**
* @var string
*/
protected $destination;
/**
* @var string
*/
protected $title;
/**
* @var array
*
* Source: https://github.com/symfony/polyfill-mbstring/blob/master/Mbstring.php
*/
private static $caseFold = [
['µ', 'ſ', "\xCD\x85", 'ς', "\xCF\x90", "\xCF\x91", "\xCF\x95", "\xCF\x96", "\xCF\xB0", "\xCF\xB1", "\xCF\xB5", "\xE1\xBA\x9B", "\xE1\xBE\xBE", "\xC3\x9F", "\xE1\xBA\x9E"],
['μ', 's', 'ι', 'σ', 'β', 'θ', 'φ', 'π', 'κ', 'ρ', 'ε', "\xE1\xB9\xA1", 'ι', 'ss', 'ss'],
];
/**
* Constructor
*
* @param string $label
* @param string $destination
* @param string $title
*/
public function __construct(string $label, string $destination, string $title)
{
$this->label = self::normalizeReference($label);
$this->destination = $destination;
$this->title = $title;
}
/**
* {@inheritdoc}
*/
public function getLabel(): string
{
return $this->label;
}
/**
* {@inheritdoc}
*/
public function getDestination(): string
{
return $this->destination;
}
/**
* {@inheritdoc}
*/
public function getTitle(): string
{
return $this->title;
}
/**
* Normalize reference label
*
* This enables case-insensitive label matching
*
* @param string $string
*
* @return string
*/
public static function normalizeReference(string $string): string
{
// Collapse internal whitespace to single space and remove
// leading/trailing whitespace
$string = \preg_replace('/\s+/', ' ', \trim($string));
if (!\defined('MB_CASE_FOLD')) {
// We're not on a version of PHP (7.3+) which has this feature
$string = \str_replace(self::$caseFold[0], self::$caseFold[1], $string);
return \mb_strtoupper($string, 'UTF-8');
}
return \mb_convert_case($string, \MB_CASE_FOLD, 'UTF-8');
}
}
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