Timezones

README.md

@@ -63,7 +63,7 @@ use text\ical\{
   Event,
   Organizer,
   Attendee,
-  Date,
+  IDate,
   Text,
   Method,
   Role,
@@ -93,8 +93,8 @@ $calendar= Calendar::with()
         ->value('MAILTO:attendee3@example.com')
         ->create()
     ])
-    ->dtstart(new Date(null, '20160524T183000Z'))
-    ->dtend(new Date(null, '20160524T190000Z'))
+    ->dtstart(new IDate(null, '20160524T183000Z'))
+    ->dtend(new IDate(null, '20160524T190000Z'))
     ->location(new Text('de-DE', 'BS 50 EG 0102'))
     ->summary(new Text('de-DE', 'Treffen'))
     ->create()

src/main/php/autoload.php

@@ -1,3 +1,3 @@
 <?php namespace xp;
 
-\lang\ClassLoader::registerPath(__DIR__);
+\lang\ClassLoader::registerPath(__DIR__);

src/main/php/module.xp

@@ -0,0 +1,22 @@
+<?php namespace text\ical;
+
+module ical {
+
+  /**
+   * Ensures `text.ical.Date` and `text.ical.TimeZone` can be instantiated
+   * when imported; the classes now have an *I* prefix in order to work in
+   * conjunction with the classes from XP Framework Core - as we'd like to
+   * retain backwards compatibility we help ourselves with `class_alias()`.
+   *
+   * @return void
+   */
+  public function initialize() {
+    spl_autoload_register(function($class) {
+      switch ($class) {
+        case Date::class: return class_alias(IDate::class, Date::class);
+        case TimeZone::class: return class_alias(ITimeZone::class, TimeZone::class);
+        default: return false;
+      }
+    });
+  }
+}

src/main/php/text/ical/Calendar.class.php

@@ -1,5 +1,7 @@
 <?php namespace text\ical;
 
+use lang\IllegalStateException;
+use util\Date;
 use util\Objects;
 
 class Calendar implements IObject {
@@ -14,15 +16,15 @@ class Calendar implements IObject {
    * @param  string $prodid
    * @param  string $version
    * @param  text.ical.Event[] $events
-   * @param  text.ical.TimeZone $timezone
+   * @param  text.ical.ITimeZone[] $timezones
    * @param  [:string] $properties
    */
-  public function __construct($method, $prodid, $version, $events, $timezone, $properties= []) {
+  public function __construct($method, $prodid, $version, $events, $timezones, $properties= []) {
     $this->method= $method;
     $this->prodid= $prodid;
     $this->version= $version;
     $this->events= $events;
-    $this->timezone= $timezone;
+    $this->timezones= $timezones;
     $this->properties= $properties;
   }
 
@@ -35,35 +37,52 @@ public function prodid() { return $this->prodid; }
   /** @return string */
   public function version() { return $this->version; }
 
-  /** @return text.ical.TimeZone */
-  public function timezone() { return $this->timezone; }
+  /** @return text.ical.ITimeZone[] */
+  public function timezones() { return $this->timezones; }
 
   /** @return text.ical.Events */
   public function events() { return new Events(...(array)$this->events); }
 
   /** @return object */
   public static function with() {
     return new class() {
-      private $method, $prodid, $version, $events, $timezone, $properties= [];
+      private $method, $prodid, $version, $events, $timezones, $properties= [];
 
       public function method($value) { $this->method= $value; return $this; }
 
       public function prodid($value) { $this->prodid= $value; return $this; }
 
       public function version($value) { $this->version= $value; return $this; }
 
-      public function timezone($value) { $this->timezone= $value; return $this; }
+      public function timezones($value) { $this->timezones= $value; return $this; }
 
       public function events($value) { $this->events= $value; return $this; }
 
       public function properties($value) { $this->properties= $value; return $this; }
 
       public function create() {
-        return new Calendar($this->method, $this->prodid, $this->version, $this->events, $this->timezone, $this->properties);
+        return new Calendar($this->method, $this->prodid, $this->version, $this->events, $this->timezones, $this->properties);
       }
     };
   }
 
+  /**
+   * Converts a calendar date value to a date instance
+   *
+   * @param  text.ical.IDate $date
+   * @return util.Date
+   * @throws lang.IllegalStateException if the date's timezone is not defined
+   */
+  public function date(IDate $date) {
+    if (null === ($tzid= $date->tzid())) return new Date($date->value());
+
+    foreach ($this->timezones as $timezone) {
+      if ($tzid === $timezone->tzid()) return $timezone->convert($date->value());
+    }
+
+    throw new IllegalStateException('No timezone definition in calendar for "'.$tzid.'"');
+  }
+
   /**
    * Write this object
    *
@@ -77,7 +96,7 @@ public function write($out, $name) {
       'prodid'   => $this->prodid,
       'version'  => $this->version,
       'event'    => $this->events,
-      'timezone' => $this->timezone
+      'timezone' => $this->timezones
     ]));
   }
 

src/main/php/text/ical/Creation.class.php

@@ -8,22 +8,22 @@ class Creation {
   const CHECK = true;
 
   private static $definitions= [null, null, [
-    'calendar' => [Calendar::class, ['events' => 'event'], [
+    'calendar' => [Calendar::class, ['events' => 'event', 'timezones' => 'timezone'], [
       'event'      => [Event::class, ['attendees' => 'attendee'], [
         'organizer'   => [Organizer::class],
         'attendee'    => [Attendee::class],
         'summary'     => [Text::class],
         'description' => [Text::class],
         'comment'     => [Text::class],
         'location'    => [Text::class],
-        'dtstart'     => [Date::class],
-        'dtstamp'     => [Date::class],
-        'dtend'       => [Date::class],
+        'dtstart'     => [IDate::class],
+        'dtstamp'     => [IDate::class],
+        'dtend'       => [IDate::class],
         'alarm'       => [Alarm::class, null, [
           'trigger'     => [Trigger::class]
         ]]
       ]],
-      'timezone'   => [TimeZone::class, null, [
+      'timezone'   => [ITimeZone::class, null, [
         'standard'    => [TimeZoneInfo::class],
         'daylight'    => [TimeZoneInfo::class],
       ]],

src/main/php/text/ical/Event.class.php

@@ -14,9 +14,9 @@ class Event implements IObject {
    * @param  text.ical.Text $description
    * @param  text.ical.Text $summary
    * @param  text.ical.Text $comment
-   * @param  text.ical.Date $dtstart
-   * @param  text.ical.Date $dtend
-   * @param  text.ical.Date $dtstamp
+   * @param  text.ical.IDate $dtstart
+   * @param  text.ical.IDate $dtend
+   * @param  text.ical.IDate $dtstamp
    * @param  string $uid
    * @param  string $class
    * @param  string $priority
@@ -60,13 +60,13 @@ public function summary() { return $this->summary; }
   /** @return text.ical.Text */
   public function comment() { return $this->comment; }
 
-  /** @return text.ical.Date */
+  /** @return text.ical.IDate */
   public function dtstart() { return $this->dtstart; }
 
-  /** @return text.ical.Date */
+  /** @return text.ical.IDate */
   public function dtend() { return $this->dtend; }
 
-  /** @return text.ical.Date */
+  /** @return text.ical.IDate */
   public function dtstamp() { return $this->dtstamp; }
 
   /** @return string */

src/main/php/text/ical/Date.class.php → src/main/php/text/ical/IDate.class.php

@@ -2,7 +2,7 @@
 
 use util\Objects;
 
-class Date implements IObject {
+class IDate implements IObject {
   private $tzid, $value;
 
   /**

src/main/php/text/ical/TimeZone.class.php → src/main/php/text/ical/ITimeZone.class.php

@@ -1,8 +1,8 @@
 <?php namespace text\ical;
 
-use util\Objects;
+use util\{Date, Objects};
 
-class TimeZone implements IObject {
+class ITimeZone implements IObject {
   private $tzid, $standard, $daylight;
 
   /**
@@ -39,11 +39,31 @@ public function standard($value) { $this->standard= $value; return $this; }
       public function daylight($value) { $this->daylight= $value; return $this; }
 
       public function create() {
-        return new TimeZone($this->tzid, $this->standard, $this->daylight);
+        return new ITimeZone($this->tzid, $this->standard, $this->daylight);
       }
     };
   }
 
+  /**
+   * Converts a date
+   *
+   * @param  string $input `YYYYMMDD"T"HHMMSS`
+   * @return util.Date
+   */
+  public function convert($input) {
+    $date= sscanf($input, '%4d%2d%2dT%2d%2d%d');
+
+    $rel= gmmktime($date[3], $date[4], $date[5], $date[1], $date[2], $date[0]);
+    $daylight= $this->daylight->start($date[0]);
+    $standard= $this->standard->start($date[0]);
+
+    if ($rel >= $standard + $this->standard->adjust() || $rel < $daylight + $this->daylight->adjust()) {
+      return new Date(gmdate('Y-m-d H:i:s'.$this->standard->tzoffsetto(), $rel));
+    } else {
+      return new Date(gmdate('Y-m-d H:i:s'.$this->daylight->tzoffsetto(), $rel));
+    }
+  }
+
   /**
    * Write this object
    *

src/main/php/text/ical/TimeZoneInfo.class.php

@@ -1,5 +1,6 @@
 <?php namespace text\ical;
 
+use lang\IllegalStateException;
 use util\Objects;
 
 class TimeZoneInfo implements IObject {
@@ -51,6 +52,65 @@ public function create() {
     };
   }
 
+  /** @return int */
+  public function offset() {
+    sscanf($this->tzoffsetto, "%c%2d:%d", $sign, $h, $m);
+    return ('-' === $sign ? -1 : 1) * ($h * 3600 + $m * 60);
+  }
+
+  /** @return int */
+  public function adjust() {
+    sscanf($this->tzoffsetfrom, "%c%2d:%d", $sign, $h, $m);
+    $from= ('-' === $sign ? -1 : 1) * ($h * 3600 + $m * 60);
+    sscanf($this->tzoffsetto, "%c%2d:%d", $sign, $h, $m);
+    $to= ('-' === $sign ? -1 : 1) * ($h * 3600 + $m * 60);
+    return $to - $from;
+  }
+
+  /**
+   * Returns start of this time for a given year in GMT
+   *
+   * @param  int $year
+   * @return int
+   */
+  public function start($year) {
+    static $days= ['MO' => 1, 'TU' => 2, 'WE' => 3, 'TH' => 4, 'FR' => 5, 'SA' => 6, 'SU' => 0];
+
+    $start= sscanf($this->dtstart, '%4d%2d%2dT%2d%2d%d');
+    if (null === $this->rrule) {
+      return gmmktime($start[3], $start[4], $start[5], $start[1], $start[2], $year);
+    } else {
+
+      // RRULE: https://tools.ietf.org/html/rfc5545#section-3.3.10
+      $r= [];
+      foreach (explode(';', $this->rrule) as $attributes) {
+        sscanf($attributes, "%[^=]=%[^\r]", $key, $value);
+        $r[$key]= $value;
+      }
+
+      if ('YEARLY' !== $r['FREQ']) {
+        throw new IllegalStateException('Unexpected frequency '.$r['FREQ']);
+      }
+
+      // -1SU = "Last Sunday in month"
+      // 1SU  = "First Sunday in month"
+      // 2SU  = "Second Sunday in month"
+      if ('-' === $r['BYDAY'][0]) {
+        $month= (int)$r['BYMONTH'] + 1;
+        $by= $days[substr($r['BYDAY'], 2)];
+        $last= idate('w', gmmktime(0, 0, 0, $month, -1, $year));
+        $day= $by - $last - 1;
+      } else {
+        $month= (int)$r['BYMONTH'];
+        $by= $days[substr($r['BYDAY'], 1)];
+        $first= idate('w', gmmktime(0, 0, 0, $month, 0, $year));
+        $day= $by + $first + 1 + 7 * ($r['BYDAY'][0] - 1);
+      }
+
+      return gmmktime($start[3], $start[4], $start[5], $month, $day, $year);
+    }
+  }
+
   /**
    * Write this object
    *

src/test/php/text/ical/unittest/Fixtures.class.php

@@ -1,8 +1,9 @@
 <?php namespace text\ical\unittest;
 
-use text\ical\{Alarm, Attendee, Calendar, Date, Event, Organizer, Text, TimeZone, TimeZoneInfo, Trigger};
+use lang\Enum;
+use text\ical\{Alarm, Attendee, Calendar, IDate, Event, Organizer, Text, ITimeZone, TimeZoneInfo, Trigger};
 
-class Fixtures extends \lang\Enum {
+class Fixtures extends Enum {
   public static $calendar, $event, $timezone, $alarm, $quoting, $properties;
 
   static function __static() {
@@ -74,8 +75,8 @@ static function __static() {
             ->value('MAILTO:attendee3@example.com')
             ->create()
         ])
-        ->dtstart(new Date('W. Europe Standard Time', '20160524T183000'))
-        ->dtend(new Date('W. Europe Standard Time', '20160524T190000'))
+        ->dtstart(new IDate('W. Europe Standard Time', '20160524T183000'))
+        ->dtend(new IDate('W. Europe Standard Time', '20160524T190000'))
         ->location(new Text('de-DE', 'BS 50 EG 0102'))
         ->comment(new Text('de-DE', "\n"))
         ->summary(new Text('de-DE', 'Treffen'))
@@ -106,7 +107,7 @@ static function __static() {
         END:VTIMEZONE
         END:VCALENDAR
       ',
-      Calendar::with()->timezone(new TimeZone(
+      Calendar::with()->timezones([new ITimeZone(
         'W. Europe Standard Time',
         TimeZoneInfo::with()
           ->dtstart('16010101T030000')
@@ -121,7 +122,7 @@ static function __static() {
           ->tzoffsetto('+0200')
           ->rrule('FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3')
           ->create()
-      ))
+      )])
       ->create()
     );