Second part of refactoring; should be runnable again, yet not thoroughly tested

[friendica-addons.git] / dav / sabre-vobject / lib / Sabre / VObject / DateTimeParser.php

diff --git a/dav/sabre-vobject/lib/Sabre/VObject/DateTimeParser.php b/dav/sabre-vobject/lib/Sabre/VObject/DateTimeParser.php
new file mode 100644 (file)
index 0000000..0ef8460
--- /dev/null
+++ b/dav/sabre-vobject/lib/Sabre/VObject/DateTimeParser.php
@@ -0,0 +1,181 @@
+<?php
+
+namespace Sabre\VObject;
+
+/**
+ * DateTimeParser
+ *
+ * This class is responsible for parsing the several different date and time
+ * formats iCalendar and vCards have.
+ *
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class DateTimeParser {
+
+    /**
+     * Parses an iCalendar (rfc5545) formatted datetime and returns a DateTime object
+     *
+     * Specifying a reference timezone is optional. It will only be used
+     * if the non-UTC format is used. The argument is used as a reference, the
+     * returned DateTime object will still be in the UTC timezone.
+     *
+     * @param string $dt
+     * @param DateTimeZone $tz
+     * @return DateTime
+     */
+    static public function parseDateTime($dt,\DateTimeZone $tz = null) {
+
+        // Format is YYYYMMDD + "T" + hhmmss
+        $result = preg_match('/^([1-3][0-9]{3})([0-1][0-9])([0-3][0-9])T([0-2][0-9])([0-5][0-9])([0-5][0-9])([Z]?)$/',$dt,$matches);
+
+        if (!$result) {
+            throw new \LogicException('The supplied iCalendar datetime value is incorrect: ' . $dt);
+        }
+
+        if ($matches[7]==='Z' || is_null($tz)) {
+            $tz = new \DateTimeZone('UTC');
+        }
+        $date = new \DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3] . ' ' . $matches[4] . ':' . $matches[5] .':' . $matches[6], $tz);
+
+        // Still resetting the timezone, to normalize everything to UTC
+        $date->setTimeZone(new \DateTimeZone('UTC'));
+        return $date;
+
+    }
+
+    /**
+     * Parses an iCalendar (rfc5545) formatted date and returns a DateTime object
+     *
+     * @param string $date
+     * @return DateTime
+     */
+    static public function parseDate($date) {
+
+        // Format is YYYYMMDD
+        $result = preg_match('/^([1-3][0-9]{3})([0-1][0-9])([0-3][0-9])$/',$date,$matches);
+
+        if (!$result) {
+            throw new \LogicException('The supplied iCalendar date value is incorrect: ' . $date);
+        }
+
+        $date = new \DateTime($matches[1] . '-' . $matches[2] . '-' . $matches[3], new \DateTimeZone('UTC'));
+        return $date;
+
+    }
+
+    /**
+     * Parses an iCalendar (RFC5545) formatted duration value.
+     *
+     * This method will either return a DateTimeInterval object, or a string
+     * suitable for strtotime or DateTime::modify.
+     *
+     * @param string $duration
+     * @param bool $asString
+     * @return DateInterval|string
+     */
+    static public function parseDuration($duration, $asString = false) {
+
+        $result = preg_match('/^(?P<plusminus>\+|-)?P((?P<week>\d+)W)?((?P<day>\d+)D)?(T((?P<hour>\d+)H)?((?P<minute>\d+)M)?((?P<second>\d+)S)?)?$/', $duration, $matches);
+        if (!$result) {
+            throw new \LogicException('The supplied iCalendar duration value is incorrect: ' . $duration);
+        }
+
+        if (!$asString) {
+            $invert = false;
+            if ($matches['plusminus']==='-') {
+                $invert = true;
+            }
+
+
+            $parts = array(
+                'week',
+                'day',
+                'hour',
+                'minute',
+                'second',
+            );
+            foreach($parts as $part) {
+                $matches[$part] = isset($matches[$part])&&$matches[$part]?(int)$matches[$part]:0;
+            }
+
+
+            // We need to re-construct the $duration string, because weeks and
+            // days are not supported by DateInterval in the same string.
+            $duration = 'P';
+            $days = $matches['day'];
+            if ($matches['week']) {
+                $days+=$matches['week']*7;
+            }
+            if ($days)
+                $duration.=$days . 'D';
+
+            if ($matches['minute'] || $matches['second'] || $matches['hour']) {
+                $duration.='T';
+
+                if ($matches['hour'])
+                    $duration.=$matches['hour'].'H';
+
+                if ($matches['minute'])
+                    $duration.=$matches['minute'].'M';
+
+                if ($matches['second'])
+                    $duration.=$matches['second'].'S';
+
+            }
+
+            if ($duration==='P') {
+                $duration = 'PT0S';
+            }
+            $iv = new \DateInterval($duration);
+            if ($invert) $iv->invert = true;
+
+            return $iv;
+
+        }
+
+
+
+        $parts = array(
+            'week',
+            'day',
+            'hour',
+            'minute',
+            'second',
+        );
+
+        $newDur = '';
+        foreach($parts as $part) {
+            if (isset($matches[$part]) && $matches[$part]) {
+                $newDur.=' '.$matches[$part] . ' ' . $part . 's';
+            }
+        }
+
+        $newDur = ($matches['plusminus']==='-'?'-':'+') . trim($newDur);
+        if ($newDur === '+') { $newDur = '+0 seconds'; };
+        return $newDur;
+
+    }
+
+    /**
+     * Parses either a Date or DateTime, or Duration value.
+     *
+     * @param string $date
+     * @param DateTimeZone|string $referenceTZ
+     * @return DateTime|DateInterval
+     */
+    static public function parse($date, $referenceTZ = null) {
+
+        if ($date[0]==='P' || ($date[0]==='-' && $date[1]==='P')) {
+            return self::parseDuration($date);
+        } elseif (strlen($date)===8) {
+            return self::parseDate($date);
+        } else {
+            return self::parseDateTime($date, $referenceTZ);
+        }
+
+    }
+
+
+}