1 files changed, 197 insertions, 0 deletions
diff --git a/library/Icinga/Util/Format.php b/library/Icinga/Util/Format.php
new file mode 100644
index 0000000..1158208
--- /dev/null
+++ b/library/Icinga/Util/Format.php
@@ -0,0 +1,197 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Util;
+
+use DateTime;
+
+class Format
+{
+    const STANDARD_IEC = 0;
+    const STANDARD_SI  = 1;
+    protected static $instance;
+
+    protected static $bitPrefix = array(
+        array('bit', 'Kibit', 'Mibit', 'Gibit', 'Tibit', 'Pibit', 'Eibit', 'Zibit', 'Yibit'),
+        array('bit', 'kbit', 'Mbit', 'Gbit', 'Tbit', 'Pbit', 'Ebit', 'Zbit', 'Ybit'),
+    );
+    protected static $bitBase = array(1024, 1000);
+
+    protected static $bytePrefix = array(
+        array('B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'),
+        array('B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'),
+    );
+    protected static $byteBase = array(1024, 1000);
+
+    protected static $secondPrefix = array('s', 'ms', 'µs', 'ns', 'ps', 'fs', 'as');
+    protected static $secondBase = 1000;
+
+    public static function getInstance()
+    {
+        if (self::$instance === null) {
+            self::$instance = new Format;
+        }
+        return self::$instance;
+    }
+
+    public static function bits($value, $standard = self::STANDARD_SI)
+    {
+        return self::formatForUnits(
+            $value,
+            self::$bitPrefix[$standard],
+            self::$bitBase[$standard]
+        );
+    }
+
+    public static function bytes($value, $standard = self::STANDARD_IEC)
+    {
+        return self::formatForUnits(
+            $value,
+            self::$bytePrefix[$standard],
+            self::$byteBase[$standard]
+        );
+    }
+
+    public static function seconds($value)
+    {
+        if ($value === null) {
+            return '';
+        }
+
+        $absValue = abs($value);
+
+        if ($absValue < 60) {
+            return self::formatForUnits($value, self::$secondPrefix, self::$secondBase);
+        } elseif ($absValue < 3600) {
+            return sprintf('%0.2f m', $value / 60);
+        } elseif ($absValue < 86400) {
+            return sprintf('%0.2f h', $value / 3600);
+        }
+
+        // TODO: Do we need weeks, months and years?
+        return sprintf('%0.2f d', $value / 86400);
+    }
+
+    protected static function formatForUnits($value, &$units, $base)
+    {
+        if ($value === null) {
+            return '';
+        }
+
+        $sign = '';
+        if ($value < 0) {
+            $value = abs($value);
+            $sign = '-';
+        }
+
+        if ($value == 0) {
+            $pow = $result = 0;
+        } else {
+            $pow = floor(log($value, $base));
+            $result = $value / pow($base, $pow);
+        }
+
+        // 1034.23 looks better than 1.03, but 2.03 is fine:
+        if ($pow > 0 && $result < 2) {
+            $result = $value / pow($base, --$pow);
+        }
+
+        return sprintf(
+            '%s%0.2f %s',
+            $sign,
+            $result,
+            $units[abs($pow)]
+        );
+    }
+
+    /**
+     * Return the amount of seconds based on the given month
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  int
+     */
+    public static function secondsByMonth($dateTimeOrTimestamp)
+    {
+        if ($dateTimeOrTimestamp === null) {
+            return 0;
+        }
+
+        if (!($dt = $dateTimeOrTimestamp) instanceof DateTime) {
+            $dt = new DateTime();
+            $dt->setTimestamp($dateTimeOrTimestamp);
+        }
+
+        return (int) $dt->format('t') * 24 * 3600;
+    }
+
+    /**
+     * Return the amount of seconds based on the given year
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  int
+     */
+    public static function secondsByYear($dateTimeOrTimestamp)
+    {
+        if ($dateTimeOrTimestamp === null) {
+            return 0;
+        }
+
+        return (self::isLeapYear($dateTimeOrTimestamp) ? 366 : 365) * 24 * 3600;
+    }
+
+    /**
+     * Return whether the given year is a leap year
+     *
+     * @param   DateTime|int    $dateTimeOrTimestamp    The date and time to use
+     *
+     * @return  bool
+     */
+    public static function isLeapYear($dateTimeOrTimestamp)
+    {
+        if ($dateTimeOrTimestamp === null) {
+            return false;
+        }
+
+        if (!($dt = $dateTimeOrTimestamp) instanceof DateTime) {
+            $dt = new DateTime();
+            $dt->setTimestamp($dateTimeOrTimestamp);
+        }
+
+        return $dt->format('L') == 1;
+    }
+
+    /**
+     * Unpack shorthand bytes PHP directives to bytes
+     *
+     * @param   string  $subject
+     *
+     * @return  int
+     */
+    public static function unpackShorthandBytes($subject)
+    {
+        $base = (int) $subject;
+
+        if ($base <= -1) {
+            return INF;
+        }
+
+        switch (strtoupper($subject[strlen($subject) - 1])) {
+            case 'K':
+                $multiplier = 1024;
+                break;
+            case 'M':
+                $multiplier = 1024 ** 2;
+                break;
+            case 'G':
+                $multiplier = 1024 ** 3;
+                break;
+            default:
+                $multiplier = 1;
+                break;
+        }
+
+        return $base * $multiplier;
+    }
+}