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