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- 06.01.2017
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AcceptHeader.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpFoundation;
013
014 /**
015 * Represents an Accept-* header.
016 *
017 * An accept header is compound with a list of items,
018 * sorted by descending quality.
019 *
020 * @author Jean-François Simon <contact@jfsimon.fr>
021 */
022 class AcceptHeader
023 {
024 /**
025 * @var AcceptHeaderItem[]
026 */
027 private $items = array();
028
029 /**
030 * @var bool
031 */
032 private $sorted = true;
033
034 /**
035 * Constructor.
036 *
037 * @param AcceptHeaderItem[] $items
038 */
039 public function __construct(array $items)
040 {
041 foreach ($items as $item) {
042 $this->add($item);
043 }
044 }
045
046 /**
047 * Builds an AcceptHeader instance from a string.
048 *
049 * @param string $headerValue
050 *
051 * @return AcceptHeader
052 */
053 public static function fromString($headerValue)
054 {
055 $index = 0;
056
057 return new self(array_map(function ($itemValue) use (&$index) {
058 $item = AcceptHeaderItem::fromString($itemValue);
059 $item->setIndex($index++);
060
061 return $item;
062 }, preg_split('/\s*(?:,*("[^"]+"),*|,*(\'[^\']+\'),*|,+)\s*/', $headerValue, 0, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE)));
063 }
064
065 /**
066 * Returns header value's string representation.
067 *
068 * @return string
069 */
070 public function __toString()
071 {
072 return implode(',', $this->items);
073 }
074
075 /**
076 * Tests if header has given value.
077 *
078 * @param string $value
079 *
080 * @return bool
081 */
082 public function has($value)
083 {
084 return isset($this->items[$value]);
085 }
086
087 /**
088 * Returns given value's item, if exists.
089 *
090 * @param string $value
091 *
092 * @return AcceptHeaderItem|null
093 */
094 public function get($value)
095 {
096 return isset($this->items[$value]) ? $this->items[$value] : null;
097 }
098
099 /**
100 * Adds an item.
101 *
102 * @param AcceptHeaderItem $item
103 *
104 * @return AcceptHeader
105 */
106 public function add(AcceptHeaderItem $item)
107 {
108 $this->items[$item->getValue()] = $item;
109 $this->sorted = false;
110
111 return $this;
112 }
113
114 /**
115 * Returns all items.
116 *
117 * @return AcceptHeaderItem[]
118 */
119 public function all()
120 {
121 $this->sort();
122
123 return $this->items;
124 }
125
126 /**
127 * Filters items on their value using given regex.
128 *
129 * @param string $pattern
130 *
131 * @return AcceptHeader
132 */
133 public function filter($pattern)
134 {
135 return new self(array_filter($this->items, function (AcceptHeaderItem $item) use ($pattern) {
136 return preg_match($pattern, $item->getValue());
137 }));
138 }
139
140 /**
141 * Returns first item.
142 *
143 * @return AcceptHeaderItem|null
144 */
145 public function first()
146 {
147 $this->sort();
148
149 return !empty($this->items) ? reset($this->items) : null;
150 }
151
152 /**
153 * Sorts items by descending quality.
154 */
155 private function sort()
156 {
157 if (!$this->sorted) {
158 uasort($this->items, function ($a, $b) {
159 $qA = $a->getQuality();
160 $qB = $b->getQuality();
161
162 if ($qA === $qB) {
163 return $a->getIndex() > $b->getIndex() ? 1 : -1;
164 }
165
166 return $qA > $qB ? -1 : 1;
167 });
168
169 $this->sorted = true;
170 }
171 }
172 }
173