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112 lines
3.0 KiB
112 lines
3.0 KiB
<?php |
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/* |
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* This file is part of the Symfony package. |
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* |
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* (c) Fabien Potencier <fabien@symfony.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Symfony\Component\Translation; |
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@trigger_error(sprintf('The "%s" class is deprecated since Symfony 4.2, use IdentityTranslator instead.', Interval::class), E_USER_DEPRECATED); |
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use Symfony\Component\Translation\Exception\InvalidArgumentException; |
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/** |
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* Tests if a given number belongs to a given math interval. |
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* |
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* An interval can represent a finite set of numbers: |
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* |
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* {1,2,3,4} |
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* |
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* An interval can represent numbers between two numbers: |
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* |
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* [1, +Inf] |
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* ]-1,2[ |
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* |
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* The left delimiter can be [ (inclusive) or ] (exclusive). |
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* The right delimiter can be [ (exclusive) or ] (inclusive). |
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* Beside numbers, you can use -Inf and +Inf for the infinite. |
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* |
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* @author Fabien Potencier <fabien@symfony.com> |
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* |
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* @see http://en.wikipedia.org/wiki/Interval_%28mathematics%29#The_ISO_notation |
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* @deprecated since Symfony 4.2, use IdentityTranslator instead |
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*/ |
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class Interval |
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{ |
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/** |
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* Tests if the given number is in the math interval. |
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* |
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* @param int $number A number |
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* @param string $interval An interval |
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* |
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* @return bool |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public static function test($number, $interval) |
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{ |
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$interval = trim($interval); |
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if (!preg_match('/^'.self::getIntervalRegexp().'$/x', $interval, $matches)) { |
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throw new InvalidArgumentException(sprintf('"%s" is not a valid interval.', $interval)); |
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} |
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if ($matches[1]) { |
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foreach (explode(',', $matches[2]) as $n) { |
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if ($number == $n) { |
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return true; |
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} |
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} |
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} else { |
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$leftNumber = self::convertNumber($matches['left']); |
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$rightNumber = self::convertNumber($matches['right']); |
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return |
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('[' === $matches['left_delimiter'] ? $number >= $leftNumber : $number > $leftNumber) |
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&& (']' === $matches['right_delimiter'] ? $number <= $rightNumber : $number < $rightNumber) |
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; |
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} |
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return false; |
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} |
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/** |
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* Returns a Regexp that matches valid intervals. |
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* |
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* @return string A Regexp (without the delimiters) |
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*/ |
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public static function getIntervalRegexp() |
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{ |
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return <<<EOF |
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({\s* |
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(\-?\d+(\.\d+)?[\s*,\s*\-?\d+(\.\d+)?]*) |
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\s*}) |
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(?P<left_delimiter>[\[\]]) |
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\s* |
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(?P<left>-Inf|\-?\d+(\.\d+)?) |
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\s*,\s* |
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(?P<right>\+?Inf|\-?\d+(\.\d+)?) |
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\s* |
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(?P<right_delimiter>[\[\]]) |
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EOF; |
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} |
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private static function convertNumber($number) |
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{ |
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if ('-Inf' === $number) { |
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return log(0); |
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} elseif ('+Inf' === $number || 'Inf' === $number) { |
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return -log(0); |
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} |
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return (float) $number; |
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} |
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}
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