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AcceptHeaderItem.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 item.
016 *
017 * @author Jean-François Simon <contact@jfsimon.fr>
018 */
019 class AcceptHeaderItem
020 {
021 /**
022 * @var string
023 */
024 private $value;
025
026 /**
027 * @var float
028 */
029 private $quality = 1.0;
030
031 /**
032 * @var int
033 */
034 private $index = 0;
035
036 /**
037 * @var array
038 */
039 private $attributes = array();
040
041 /**
042 * Constructor.
043 *
044 * @param string $value
045 * @param array $attributes
046 */
047 public function __construct($value, array $attributes = array())
048 {
049 $this->value = $value;
050 foreach ($attributes as $name => $value) {
051 $this->setAttribute($name, $value);
052 }
053 }
054
055 /**
056 * Builds an AcceptHeaderInstance instance from a string.
057 *
058 * @param string $itemValue
059 *
060 * @return AcceptHeaderItem
061 */
062 public static function fromString($itemValue)
063 {
064 $bits = preg_split('/\s*(?:;*("[^"]+");*|;*(\'[^\']+\');*|;+)\s*/', $itemValue, 0, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
065 $value = array_shift($bits);
066 $attributes = array();
067
068 $lastNullAttribute = null;
069 foreach ($bits as $bit) {
070 if (($start = substr($bit, 0, 1)) === ($end = substr($bit, -1)) && ($start === '"' || $start === '\'')) {
071 $attributes[$lastNullAttribute] = substr($bit, 1, -1);
072 } elseif ('=' === $end) {
073 $lastNullAttribute = $bit = substr($bit, 0, -1);
074 $attributes[$bit] = null;
075 } else {
076 $parts = explode('=', $bit);
077 $attributes[$parts[0]] = isset($parts[1]) && strlen($parts[1]) > 0 ? $parts[1] : '';
078 }
079 }
080
081 return new self(($start = substr($value, 0, 1)) === ($end = substr($value, -1)) && ($start === '"' || $start === '\'') ? substr($value, 1, -1) : $value, $attributes);
082 }
083
084 /**
085 * Returns header value's string representation.
086 *
087 * @return string
088 */
089 public function __toString()
090 {
091 $string = $this->value.($this->quality < 1 ? ';q='.$this->quality : '');
092 if (count($this->attributes) > 0) {
093 $string .= ';'.implode(';', array_map(function ($name, $value) {
094 return sprintf(preg_match('/[,;=]/', $value) ? '%s="%s"' : '%s=%s', $name, $value);
095 }, array_keys($this->attributes), $this->attributes));
096 }
097
098 return $string;
099 }
100
101 /**
102 * Set the item value.
103 *
104 * @param string $value
105 *
106 * @return AcceptHeaderItem
107 */
108 public function setValue($value)
109 {
110 $this->value = $value;
111
112 return $this;
113 }
114
115 /**
116 * Returns the item value.
117 *
118 * @return string
119 */
120 public function getValue()
121 {
122 return $this->value;
123 }
124
125 /**
126 * Set the item quality.
127 *
128 * @param float $quality
129 *
130 * @return AcceptHeaderItem
131 */
132 public function setQuality($quality)
133 {
134 $this->quality = $quality;
135
136 return $this;
137 }
138
139 /**
140 * Returns the item quality.
141 *
142 * @return float
143 */
144 public function getQuality()
145 {
146 return $this->quality;
147 }
148
149 /**
150 * Set the item index.
151 *
152 * @param int $index
153 *
154 * @return AcceptHeaderItem
155 */
156 public function setIndex($index)
157 {
158 $this->index = $index;
159
160 return $this;
161 }
162
163 /**
164 * Returns the item index.
165 *
166 * @return int
167 */
168 public function getIndex()
169 {
170 return $this->index;
171 }
172
173 /**
174 * Tests if an attribute exists.
175 *
176 * @param string $name
177 *
178 * @return bool
179 */
180 public function hasAttribute($name)
181 {
182 return isset($this->attributes[$name]);
183 }
184
185 /**
186 * Returns an attribute by its name.
187 *
188 * @param string $name
189 * @param mixed $default
190 *
191 * @return mixed
192 */
193 public function getAttribute($name, $default = null)
194 {
195 return isset($this->attributes[$name]) ? $this->attributes[$name] : $default;
196 }
197
198 /**
199 * Returns all attributes.
200 *
201 * @return array
202 */
203 public function getAttributes()
204 {
205 return $this->attributes;
206 }
207
208 /**
209 * Set an attribute.
210 *
211 * @param string $name
212 * @param string $value
213 *
214 * @return AcceptHeaderItem
215 */
216 public function setAttribute($name, $value)
217 {
218 if ('q' === $name) {
219 $this->quality = (float) $value;
220 } else {
221 $this->attributes[$name] = (string) $value;
222 }
223
224 return $this;
225 }
226 }
227