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[yaffs-website] / vendor / symfony / translation / Interval.php

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+<?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;
+
+/**
+ * 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
+ */
+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;
+    }
+}