Matthias Andreas Benkard | 7b2a3a1 | 2021-08-16 10:57:25 +0200 | [diff] [blame^] | 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * This file is part of the Carbon package. |
| 5 | * |
| 6 | * (c) Brian Nesbitt <brian@nesbot.com> |
| 7 | * |
| 8 | * For the full copyright and license information, please view the LICENSE |
| 9 | * file that was distributed with this source code. |
| 10 | */ |
| 11 | namespace Carbon; |
| 12 | |
| 13 | use Carbon\Exceptions\InvalidCastException; |
| 14 | use Carbon\Exceptions\InvalidTimeZoneException; |
| 15 | use DateTimeInterface; |
| 16 | use DateTimeZone; |
| 17 | |
| 18 | class CarbonTimeZone extends DateTimeZone |
| 19 | { |
| 20 | public function __construct($timezone = null) |
| 21 | { |
| 22 | parent::__construct(static::getDateTimeZoneNameFromMixed($timezone)); |
| 23 | } |
| 24 | |
| 25 | protected static function parseNumericTimezone($timezone) |
| 26 | { |
| 27 | if ($timezone <= -100 || $timezone >= 100) { |
| 28 | throw new InvalidTimeZoneException('Absolute timezone offset cannot be greater than 100.'); |
| 29 | } |
| 30 | |
| 31 | return ($timezone >= 0 ? '+' : '').$timezone.':00'; |
| 32 | } |
| 33 | |
| 34 | protected static function getDateTimeZoneNameFromMixed($timezone) |
| 35 | { |
| 36 | if ($timezone === null) { |
| 37 | return date_default_timezone_get(); |
| 38 | } |
| 39 | |
| 40 | if (\is_string($timezone)) { |
| 41 | $timezone = preg_replace('/^\s*([+-]\d+)(\d{2})\s*$/', '$1:$2', $timezone); |
| 42 | } |
| 43 | |
| 44 | if (is_numeric($timezone)) { |
| 45 | return static::parseNumericTimezone($timezone); |
| 46 | } |
| 47 | |
| 48 | return $timezone; |
| 49 | } |
| 50 | |
| 51 | protected static function getDateTimeZoneFromName(&$name) |
| 52 | { |
| 53 | return @timezone_open($name = (string) static::getDateTimeZoneNameFromMixed($name)); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Cast the current instance into the given class. |
| 58 | * |
| 59 | * @param string $className The $className::instance() method will be called to cast the current object. |
| 60 | * |
| 61 | * @return DateTimeZone |
| 62 | */ |
| 63 | public function cast(string $className) |
| 64 | { |
| 65 | if (!method_exists($className, 'instance')) { |
| 66 | if (is_a($className, DateTimeZone::class, true)) { |
| 67 | return new $className($this->getName()); |
| 68 | } |
| 69 | |
| 70 | throw new InvalidCastException("$className has not the instance() method needed to cast the date."); |
| 71 | } |
| 72 | |
| 73 | return $className::instance($this); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Create a CarbonTimeZone from mixed input. |
| 78 | * |
| 79 | * @param DateTimeZone|string|int|null $object original value to get CarbonTimeZone from it. |
| 80 | * @param DateTimeZone|string|int|null $objectDump dump of the object for error messages. |
| 81 | * |
| 82 | * @throws InvalidTimeZoneException |
| 83 | * |
| 84 | * @return false|static |
| 85 | */ |
| 86 | public static function instance($object = null, $objectDump = null) |
| 87 | { |
| 88 | $tz = $object; |
| 89 | |
| 90 | if ($tz instanceof static) { |
| 91 | return $tz; |
| 92 | } |
| 93 | |
| 94 | if ($tz === null) { |
| 95 | return new static(); |
| 96 | } |
| 97 | |
| 98 | if (!$tz instanceof DateTimeZone) { |
| 99 | $tz = static::getDateTimeZoneFromName($object); |
| 100 | } |
| 101 | |
| 102 | if ($tz === false) { |
| 103 | if (Carbon::isStrictModeEnabled()) { |
| 104 | throw new InvalidTimeZoneException('Unknown or bad timezone ('.($objectDump ?: $object).')'); |
| 105 | } |
| 106 | |
| 107 | return false; |
| 108 | } |
| 109 | |
| 110 | return new static($tz->getName()); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Returns abbreviated name of the current timezone according to DST setting. |
| 115 | * |
| 116 | * @param bool $dst |
| 117 | * |
| 118 | * @return string |
| 119 | */ |
| 120 | public function getAbbreviatedName($dst = false) |
| 121 | { |
| 122 | $name = $this->getName(); |
| 123 | |
| 124 | foreach ($this->listAbbreviations() as $abbreviation => $zones) { |
| 125 | foreach ($zones as $zone) { |
| 126 | if ($zone['timezone_id'] === $name && $zone['dst'] == $dst) { |
| 127 | return $abbreviation; |
| 128 | } |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | return 'unknown'; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * @alias getAbbreviatedName |
| 137 | * |
| 138 | * Returns abbreviated name of the current timezone according to DST setting. |
| 139 | * |
| 140 | * @param bool $dst |
| 141 | * |
| 142 | * @return string |
| 143 | */ |
| 144 | public function getAbbr($dst = false) |
| 145 | { |
| 146 | return $this->getAbbreviatedName($dst); |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Get the offset as string "sHH:MM" (such as "+00:00" or "-12:30"). |
| 151 | * |
| 152 | * @param DateTimeInterface|null $date |
| 153 | * |
| 154 | * @return string |
| 155 | */ |
| 156 | public function toOffsetName(DateTimeInterface $date = null) |
| 157 | { |
| 158 | return static::getOffsetNameFromMinuteOffset( |
| 159 | $this->getOffset($date ?: Carbon::now($this)) / 60 |
| 160 | ); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Returns a new CarbonTimeZone object using the offset string instead of region string. |
| 165 | * |
| 166 | * @param DateTimeInterface|null $date |
| 167 | * |
| 168 | * @return CarbonTimeZone |
| 169 | */ |
| 170 | public function toOffsetTimeZone(DateTimeInterface $date = null) |
| 171 | { |
| 172 | return new static($this->toOffsetName($date)); |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Returns the first region string (such as "America/Toronto") that matches the current timezone or |
| 177 | * false if no match is found. |
| 178 | * |
| 179 | * @see timezone_name_from_abbr native PHP function. |
| 180 | * |
| 181 | * @param DateTimeInterface|null $date |
| 182 | * @param int $isDst |
| 183 | * |
| 184 | * @return string|false |
| 185 | */ |
| 186 | public function toRegionName(DateTimeInterface $date = null, $isDst = 1) |
| 187 | { |
| 188 | $name = $this->getName(); |
| 189 | $firstChar = substr($name, 0, 1); |
| 190 | |
| 191 | if ($firstChar !== '+' && $firstChar !== '-') { |
| 192 | return $name; |
| 193 | } |
| 194 | |
| 195 | $date = $date ?: Carbon::now($this); |
| 196 | |
| 197 | // Integer construction no longer supported since PHP 8 |
| 198 | // @codeCoverageIgnoreStart |
| 199 | try { |
| 200 | $offset = @$this->getOffset($date) ?: 0; |
| 201 | } catch (\Throwable $e) { |
| 202 | $offset = 0; |
| 203 | } |
| 204 | // @codeCoverageIgnoreEnd |
| 205 | |
| 206 | $name = @timezone_name_from_abbr('', $offset, $isDst); |
| 207 | |
| 208 | if ($name) { |
| 209 | return $name; |
| 210 | } |
| 211 | |
| 212 | foreach (timezone_identifiers_list() as $timezone) { |
| 213 | if (Carbon::instance($date)->tz($timezone)->getOffset() === $offset) { |
| 214 | return $timezone; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | return false; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Returns a new CarbonTimeZone object using the region string instead of offset string. |
| 223 | * |
| 224 | * @param DateTimeInterface|null $date |
| 225 | * |
| 226 | * @return CarbonTimeZone|false |
| 227 | */ |
| 228 | public function toRegionTimeZone(DateTimeInterface $date = null) |
| 229 | { |
| 230 | $tz = $this->toRegionName($date); |
| 231 | |
| 232 | if ($tz === false) { |
| 233 | if (Carbon::isStrictModeEnabled()) { |
| 234 | throw new InvalidTimeZoneException('Unknown timezone for offset '.$this->getOffset($date ?: Carbon::now($this)).' seconds.'); |
| 235 | } |
| 236 | |
| 237 | return false; |
| 238 | } |
| 239 | |
| 240 | return new static($tz); |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * Cast to string (get timezone name). |
| 245 | * |
| 246 | * @return string |
| 247 | */ |
| 248 | public function __toString() |
| 249 | { |
| 250 | return $this->getName(); |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Create a CarbonTimeZone from mixed input. |
| 255 | * |
| 256 | * @param DateTimeZone|string|int|null $object |
| 257 | * |
| 258 | * @return false|static |
| 259 | */ |
| 260 | public static function create($object = null) |
| 261 | { |
| 262 | return static::instance($object); |
| 263 | } |
| 264 | |
| 265 | /** |
| 266 | * Create a CarbonTimeZone from int/float hour offset. |
| 267 | * |
| 268 | * @param float $hourOffset number of hour of the timezone shift (can be decimal). |
| 269 | * |
| 270 | * @return false|static |
| 271 | */ |
| 272 | public static function createFromHourOffset(float $hourOffset) |
| 273 | { |
| 274 | return static::createFromMinuteOffset($hourOffset * Carbon::MINUTES_PER_HOUR); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Create a CarbonTimeZone from int/float minute offset. |
| 279 | * |
| 280 | * @param float $minuteOffset number of total minutes of the timezone shift. |
| 281 | * |
| 282 | * @return false|static |
| 283 | */ |
| 284 | public static function createFromMinuteOffset(float $minuteOffset) |
| 285 | { |
| 286 | return static::instance(static::getOffsetNameFromMinuteOffset($minuteOffset)); |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Convert a total minutes offset into a standardized timezone offset string. |
| 291 | * |
| 292 | * @param float $minutes number of total minutes of the timezone shift. |
| 293 | * |
| 294 | * @return string |
| 295 | */ |
| 296 | public static function getOffsetNameFromMinuteOffset(float $minutes): string |
| 297 | { |
| 298 | $minutes = round($minutes); |
| 299 | $unsignedMinutes = abs($minutes); |
| 300 | |
| 301 | return ($minutes < 0 ? '-' : '+'). |
| 302 | str_pad((string) floor($unsignedMinutes / 60), 2, '0', STR_PAD_LEFT). |
| 303 | ':'. |
| 304 | str_pad((string) ($unsignedMinutes % 60), 2, '0', STR_PAD_LEFT); |
| 305 | } |
| 306 | } |