103 lines
2.6 KiB
PHP
103 lines
2.6 KiB
PHP
|
<?php
|
||
|
|
|
||
|
|
namespace Symfony\Component\Translation;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This file is part of the Symfony framework.
|
||
|
|
*
|
||
|
|
* (c) Fabien Potencier <fabien.potencier@symfony-project.com>
|
||
|
|
*
|
||
|
|
* This source file is subject to the MIT license that is bundled
|
||
|
|
* with this source code in the file LICENSE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Range tests if a given number belongs to a given range.
|
||
|
|
*
|
||
|
|
* A range can represent a finite set of numbers:
|
||
|
|
*
|
||
|
|
* {1,2,3,4}
|
||
|
|
*
|
||
|
|
* A range 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.potencier@symfony-project.com>
|
||
|
|
*/
|
||
|
|
class Range
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* Tests if the given number is in the range.
|
||
|
|
*
|
||
|
|
* @param integer $number A number
|
||
|
|
* @param string $range A range of numbers
|
||
|
|
*/
|
||
|
|
static public function test($number, $range)
|
||
|
|
{
|
||
|
|
$range = trim($range);
|
||
|
|
|
||
|
|
if (!preg_match('/^'.self::getRangeRegexp().'$/x', $range, $matches)) {
|
||
|
|
throw new \InvalidArgumentException(sprintf('"%s" is not a valid range expression.', $range));
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($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 ranges.
|
||
|
|
*
|
||
|
|
* @return string A Regexp (without the delimiters)
|
||
|
|
*/
|
||
|
|
static public function getRangeRegexp()
|
||
|
|
{
|
||
|
|
return <<<EOF
|
||
|
|
({\s*
|
||
|
|
(\-?\d+[\s*,\s*\-?\d+]*)
|
||
|
|
\s*})
|
||
|
|
|
||
|
|
|
|
||
|
|
|
||
|
|
(?<left_delimiter>[\[\]])
|
||
|
|
\s*
|
||
|
|
(?<left>-Inf|\-?\d+)
|
||
|
|
\s*,\s*
|
||
|
|
(?<right>\+?Inf|\-?\d+)
|
||
|
|
\s*
|
||
|
|
(?<right_delimiter>[\[\]])
|
||
|
|
EOF;
|
||
|
|
}
|
||
|
|
|
||
|
|
static protected function convertNumber($number)
|
||
|
|
{
|
||
|
|
if ('-Inf' === $number) {
|
||
|
|
return log(0);
|
||
|
|
} elseif ('+Inf' === $number || 'Inf' === $number) {
|
||
|
|
return -log(0);
|
||
|
|
} else {
|
||
|
|
return (int) $number;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|