Mercurial > hg > cmmr2012-drupal-site
comparison vendor/symfony/translation/Interval.php @ 0:c75dbcec494b
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author | Chris Cannam |
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date | Thu, 05 Jul 2018 14:24:15 +0000 |
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1 <?php | |
2 | |
3 /* | |
4 * This file is part of the Symfony package. | |
5 * | |
6 * (c) Fabien Potencier <fabien@symfony.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 | |
12 namespace Symfony\Component\Translation; | |
13 | |
14 use Symfony\Component\Translation\Exception\InvalidArgumentException; | |
15 | |
16 /** | |
17 * Tests if a given number belongs to a given math interval. | |
18 * | |
19 * An interval can represent a finite set of numbers: | |
20 * | |
21 * {1,2,3,4} | |
22 * | |
23 * An interval can represent numbers between two numbers: | |
24 * | |
25 * [1, +Inf] | |
26 * ]-1,2[ | |
27 * | |
28 * The left delimiter can be [ (inclusive) or ] (exclusive). | |
29 * The right delimiter can be [ (exclusive) or ] (inclusive). | |
30 * Beside numbers, you can use -Inf and +Inf for the infinite. | |
31 * | |
32 * @author Fabien Potencier <fabien@symfony.com> | |
33 * | |
34 * @see http://en.wikipedia.org/wiki/Interval_%28mathematics%29#The_ISO_notation | |
35 */ | |
36 class Interval | |
37 { | |
38 /** | |
39 * Tests if the given number is in the math interval. | |
40 * | |
41 * @param int $number A number | |
42 * @param string $interval An interval | |
43 * | |
44 * @return bool | |
45 * | |
46 * @throws InvalidArgumentException | |
47 */ | |
48 public static function test($number, $interval) | |
49 { | |
50 $interval = trim($interval); | |
51 | |
52 if (!preg_match('/^'.self::getIntervalRegexp().'$/x', $interval, $matches)) { | |
53 throw new InvalidArgumentException(sprintf('"%s" is not a valid interval.', $interval)); | |
54 } | |
55 | |
56 if ($matches[1]) { | |
57 foreach (explode(',', $matches[2]) as $n) { | |
58 if ($number == $n) { | |
59 return true; | |
60 } | |
61 } | |
62 } else { | |
63 $leftNumber = self::convertNumber($matches['left']); | |
64 $rightNumber = self::convertNumber($matches['right']); | |
65 | |
66 return | |
67 ('[' === $matches['left_delimiter'] ? $number >= $leftNumber : $number > $leftNumber) | |
68 && (']' === $matches['right_delimiter'] ? $number <= $rightNumber : $number < $rightNumber) | |
69 ; | |
70 } | |
71 | |
72 return false; | |
73 } | |
74 | |
75 /** | |
76 * Returns a Regexp that matches valid intervals. | |
77 * | |
78 * @return string A Regexp (without the delimiters) | |
79 */ | |
80 public static function getIntervalRegexp() | |
81 { | |
82 return <<<EOF | |
83 ({\s* | |
84 (\-?\d+(\.\d+)?[\s*,\s*\-?\d+(\.\d+)?]*) | |
85 \s*}) | |
86 | |
87 | | |
88 | |
89 (?P<left_delimiter>[\[\]]) | |
90 \s* | |
91 (?P<left>-Inf|\-?\d+(\.\d+)?) | |
92 \s*,\s* | |
93 (?P<right>\+?Inf|\-?\d+(\.\d+)?) | |
94 \s* | |
95 (?P<right_delimiter>[\[\]]) | |
96 EOF; | |
97 } | |
98 | |
99 private static function convertNumber($number) | |
100 { | |
101 if ('-Inf' === $number) { | |
102 return log(0); | |
103 } elseif ('+Inf' === $number || 'Inf' === $number) { | |
104 return -log(0); | |
105 } | |
106 | |
107 return (float) $number; | |
108 } | |
109 } |