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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpFoundation;
/**
* Represents an Accept-* header.
*
* An accept header is compound with a list of items,
* sorted by descending quality.
*
* @author Jean-François Simon <contact@jfsimon.fr>
*/
class AcceptHeader
{
/**
* @var AcceptHeaderItem[]
*/
private $items = array();
/**
* @var bool
*/
private $sorted = true;
/**
* @param AcceptHeaderItem[] $items
*/
public function __construct(array $items)
{
foreach ($items as $item) {
$this->add($item);
}
}
/**
* Builds an AcceptHeader instance from a string.
*
* @param string $headerValue
*
* @return self
*/
public static function fromString($headerValue)
{
$index = 0;
$parts = HeaderUtils::split((string) $headerValue, ',;=');
return new self(array_map(function ($subParts) use (&$index) {
$part = array_shift($subParts);
$attributes = HeaderUtils::combine($subParts);
$item = new AcceptHeaderItem($part[0], $attributes);
$item->setIndex($index++);
return $item;
}, $parts));
}
/**
* Returns header value's string representation.
*
* @return string
*/
public function __toString()
{
return implode(',', $this->items);
}
/**
* Tests if header has given value.
*
* @param string $value
*
* @return bool
*/
public function has($value)
{
return isset($this->items[$value]);
}
/**
* Returns given value's item, if exists.
*
* @param string $value
*
* @return AcceptHeaderItem|null
*/
public function get($value)
{
return $this->items[$value] ?? $this->items[explode('/', $value)[0].'/*'] ?? $this->items['*/*'] ?? $this->items['*'] ?? null;
}
/**
* Adds an item.
*
* @return $this
*/
public function add(AcceptHeaderItem $item)
{
$this->items[$item->getValue()] = $item;
$this->sorted = false;
return $this;
}
/**
* Returns all items.
*
* @return AcceptHeaderItem[]
*/
public function all()
{
$this->sort();
return $this->items;
}
/**
* Filters items on their value using given regex.
*
* @param string $pattern
*
* @return self
*/
public function filter($pattern)
{
return new self(array_filter($this->items, function (AcceptHeaderItem $item) use ($pattern) {
return preg_match($pattern, $item->getValue());
}));
}
/**
* Returns first item.
*
* @return AcceptHeaderItem|null
*/
public function first()
{
$this->sort();
return !empty($this->items) ? reset($this->items) : null;
}
/**
* Sorts items by descending quality.
*/
private function sort()
{
if (!$this->sorted) {
uasort($this->items, function (AcceptHeaderItem $a, AcceptHeaderItem $b) {
$qA = $a->getQuality();
$qB = $b->getQuality();
if ($qA === $qB) {
return $a->getIndex() > $b->getIndex() ? 1 : -1;
}
return $qA > $qB ? -1 : 1;
});
$this->sorted = true;
}
}
}