source: branches/version-2_13_0/data/module/Calendar/Engine/PearDate.php @ 23143

Revision 23143, 11.1 KB checked in by m_uehara, 7 years ago (diff)

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1<?php
2/* vim: set expandtab tabstop=4 shiftwidth=4: */
3//
4// +----------------------------------------------------------------------+
5// | PHP Version 4                                                        |
6// +----------------------------------------------------------------------+
7// | Copyright (c) 1997-2002 The PHP Group                                |
8// +----------------------------------------------------------------------+
9// | This source file is subject to version 2.02 of the PHP license,      |
10// | that is bundled with this package in the file LICENSE, and is        |
11// | available at through the world-wide-web at                           |
12// | http://www.php.net/license/3_0.txt.                                  |
13// | If you did not receive a copy of the PHP license and are unable to   |
14// | obtain it through the world-wide-web, please send a note to          |
15// | license@php.net so we can mail you a copy immediately.               |
16// +----------------------------------------------------------------------+
17// | Authors: Lorenzo Alberton <l dot alberton at quipo dot it>           |
18// +----------------------------------------------------------------------+
19//
20// $Id: PearDate.php,v 1.8 2004/08/20 20:00:55 quipo Exp $
21//
22/**
23 * @package Calendar
24 * @version $Id: PearDate.php,v 1.8 2004/08/20 20:00:55 quipo Exp $
25 */
26/**
27 * Load PEAR::Date class
28 */
29require_once 'Date.php';
30
31/**
32 * Performs calendar calculations based on the PEAR::Date class
33 * Timestamps are in the ISO-8601 format (YYYY-MM-DD HH:MM:SS)
34 * @package Calendar
35 * @access protected
36 */
37class Calendar_Engine_PearDate /* implements Calendar_Engine_Interface */
38{
39    /**
40     * Makes sure a given timestamp is only ever parsed once
41     * Uses a static variable to prevent date() being used twice
42     * for a date which is already known
43     * @param mixed Any timestamp format recognized by Pear::Date
44     * @return object Pear::Date object
45     * @access protected
46     */
47    function stampCollection($stamp)
48    {
49        static $stamps = array();
50        if (!isset($stamps[$stamp])) {
51            $stamps[$stamp] = new Date($stamp);
52        }
53        return $stamps[$stamp];
54    }
55
56    /**
57     * Returns a numeric year given a iso-8601 datetime
58     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
59     * @return int year (e.g. 2003)
60     * @access protected
61     */
62    function stampToYear($stamp)
63    {
64        $date = Calendar_Engine_PearDate::stampCollection($stamp);
65        return (int)$date->year;
66    }
67
68    /**
69     * Returns a numeric month given a iso-8601 datetime
70     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
71     * @return int month (e.g. 9)
72     * @access protected
73     */
74    function stampToMonth($stamp)
75    {
76        $date = Calendar_Engine_PearDate::stampCollection($stamp);
77        return (int)$date->month;
78    }
79
80    /**
81     * Returns a numeric day given a iso-8601 datetime
82     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
83     * @return int day (e.g. 15)
84     * @access protected
85     */
86    function stampToDay($stamp)
87    {
88        $date = Calendar_Engine_PearDate::stampCollection($stamp);
89        return (int)$date->day;
90    }
91
92    /**
93     * Returns a numeric hour given a iso-8601 datetime
94     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
95     * @return int hour (e.g. 13)
96     * @access protected
97     */
98    function stampToHour($stamp)
99    {
100        $date = Calendar_Engine_PearDate::stampCollection($stamp);
101        return (int)$date->hour;
102    }
103
104    /**
105     * Returns a numeric minute given a iso-8601 datetime
106     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
107     * @return int minute (e.g. 34)
108     * @access protected
109     */
110    function stampToMinute($stamp)
111    {
112        $date = Calendar_Engine_PearDate::stampCollection($stamp);
113        return (int)$date->minute;
114    }
115
116    /**
117     * Returns a numeric second given a iso-8601 datetime
118     * @param string iso-8601 datetime (YYYY-MM-DD HH:MM:SS)
119     * @return int second (e.g. 51)
120     * @access protected
121     */
122    function stampToSecond($stamp)
123    {
124        $date = Calendar_Engine_PearDate::stampCollection($stamp);
125        return (int)$date->second;
126    }
127
128    /**
129     * Returns a iso-8601 datetime
130     * @param int year (2003)
131     * @param int month (9)
132     * @param int day (13)
133     * @param int hour (13)
134     * @param int minute (34)
135     * @param int second (53)
136     * @return string iso-8601 datetime
137     * @access protected
138     */
139    function dateToStamp($y, $m, $d, $h=0, $i=0, $s=0)
140    {
141        $r = array();
142        Calendar_Engine_PearDate::adjustDate($y, $m, $d, $h, $i, $s);
143        $key = $y.$m.$d.$h.$i.$s;
144        if (!isset($r[$key])) {
145            $r[$key] = sprintf("%04d-%02d-%02d %02d:%02d:%02d",
146                                $y, $m, $d, $h, $i, $s);
147        }
148        return $r[$key];
149    }
150
151    /**
152     * Set the correct date values (useful for math operations on dates)
153     * @param int year   (2003)
154     * @param int month  (9)
155     * @param int day    (13)
156     * @param int hour   (13)
157     * @param int minute (34)
158     * @param int second (53)
159     * @access protected
160     */
161    function adjustDate(&$y, &$m, &$d, &$h, &$i, &$s)
162    {
163        if ($s < 0) {
164            $m -= floor($s / 60);
165            $s = -$s % 60;
166        }
167        if ($s > 60) {
168            $m += floor($s / 60);
169            $s %= 60;
170        }
171        if ($i < 0) {
172            $h -= floor($i / 60);
173            $i = -$i % 60;
174        }
175        if ($i > 60) {
176            $h += floor($i / 60);
177            $i %= 60;
178        }
179        if ($h < 0) {
180            $d -= floor($h / 24);
181            $h = -$h % 24;
182        }
183        if ($h > 24) {
184            $d += floor($h / 24);
185            $h %= 24;
186        }
187        for(; $m < 1; $y--, $m+=12);
188        for(; $m > 12; $y++, $m-=12);
189
190        while ($d < 1) {
191            if ($m > 1) {
192                $m--;
193            } else {
194                $m = 12;
195                $y--;
196            }
197            $d += Date_Calc::daysInMonth($m, $y);
198        }
199        for ($max_days = Date_Calc::daysInMonth($m, $y); $d > $max_days; ) {
200            $d -= $max_days;
201            if ($m < 12) {
202                $m++;
203            } else {
204                $m = 1;
205                $y++;
206            }
207        }
208    }
209
210    /**
211     * The upper limit on years that the Calendar Engine can work with
212     * @return int 9999
213     * @access protected
214     */
215    function getMaxYears()
216    {
217        return 9999;
218    }
219
220    /**
221     * The lower limit on years that the Calendar Engine can work with
222     * @return int 0
223     * @access protected
224     */
225    function getMinYears()
226    {
227        return 0;
228    }
229
230    /**
231     * Returns the number of months in a year
232     * @return int (12)
233     * @access protected
234     */
235    function getMonthsInYear($y=null)
236    {
237        return 12;
238    }
239
240    /**
241     * Returns the number of days in a month, given year and month
242     * @param int year (2003)
243     * @param int month (9)
244     * @return int days in month
245     * @access protected
246     */
247    function getDaysInMonth($y, $m)
248    {
249        return (int)Date_Calc::daysInMonth($m, $y);
250    }
251
252    /**
253     * Returns numeric representation of the day of the week in a month,
254     * given year and month
255     * @param int year (2003)
256     * @param int month (9)
257     * @return int from 0 to 7
258     * @access protected
259     */
260    function getFirstDayInMonth($y, $m)
261    {
262        return (int)Date_Calc::dayOfWeek(1, $m, $y);
263    }
264
265    /**
266     * Returns the number of days in a week
267     * @param int year (2003)
268     * @param int month (9)
269     * @param int day (4)
270     * @return int (7)
271     * @access protected
272     */
273    function getDaysInWeek($y=NULL, $m=NULL, $d=NULL)
274    {
275        return 7;
276    }
277
278    /**
279     * Returns the number of the week in the year (ISO-8601), given a date
280     * @param int year (2003)
281     * @param int month (9)
282     * @param int day (4)
283     * @return int week number
284     * @access protected
285     */
286    function getWeekNInYear($y, $m, $d)
287    {
288        return Date_Calc::weekOfYear($d, $m, $y); //beware, Date_Calc doesn't follow ISO-8601 standard!
289    }
290
291    /**
292     * Returns the number of the week in the month, given a date
293     * @param int year (2003)
294     * @param int month (9)
295     * @param int day (4)
296     * @param int first day of the week (default: monday)
297     * @return int week number
298     * @access protected
299     */
300    function getWeekNInMonth($y, $m, $d, $firstDay=1)
301    {
302        $weekEnd = ($firstDay == 0) ? $this->getDaysInWeek()-1 : $firstDay-1;
303        $end_of_week = (int)Date_Calc::nextDayOfWeek($weekEnd, 1, $m, $y, '%e', true);
304        $w = 1;
305        while ($d > $end_of_week) {
306            ++$w;
307            $end_of_week += $this->getDaysInWeek();
308        }
309        return $w;
310    }
311
312    /**
313     * Returns the number of weeks in the month
314     * @param int year (2003)
315     * @param int month (9)
316     * @param int first day of the week (default: monday)
317     * @return int weeks number
318     * @access protected
319     */
320    function getWeeksInMonth($y, $m, $firstDay=1)
321    {
322        $FDOM = Date_Calc::firstOfMonthWeekday($m, $y);
323        if ($FDOM == 0) {
324            $FDOM = $this->getDaysInWeek();
325        }
326        if ($FDOM > $firstDay) {
327            $daysInTheFirstWeek = $this->getDaysInWeek() - $FDOM + $firstDay;
328            $weeks = 1;
329        } else {
330            $daysInTheFirstWeek = $firstDay - $FDOM;
331            $weeks = 0;
332        }
333        $daysInTheFirstWeek %= $this->getDaysInWeek();
334        return (int)(ceil(($this->getDaysInMonth($y, $m) - $daysInTheFirstWeek) /
335                           $this->getDaysInWeek()) + $weeks);
336    }
337
338    /**
339     * Returns the number of the day of the week (0=sunday, 1=monday...)
340     * @param int year (2003)
341     * @param int month (9)
342     * @param int day (4)
343     * @return int weekday number
344     * @access protected
345     */
346    function getDayOfWeek($y, $m, $d)
347    {
348        return Date_Calc::dayOfWeek($d, $m, $y);
349    }
350
351    /**
352     * Returns a list of integer days of the week beginning 0
353     * @param int year (2003)
354     * @param int month (9)
355     * @param int day (4)
356     * @return array (0, 1, 2, 3, 4, 5, 6) 1 = Monday
357     * @access protected
358     */
359    function getWeekDays($y=NULL, $m=NULL, $d=NULL)
360    {
361        return array(0, 1, 2, 3, 4, 5, 6);
362    }
363
364    /**
365     * Returns the default first day of the week
366     * @param int year (2003)
367     * @param int month (9)
368     * @param int day (4)
369     * @return int (default 1 = Monday)
370     * @access protected
371     */
372    function getFirstDayOfWeek($y=NULL, $m=NULL, $d=NULL)
373    {
374        return 1;
375    }
376
377    /**
378     * Returns the number of hours in a day
379     * @return int (24)
380     * @access protected
381     */
382    function getHoursInDay($y=null,$m=null,$d=null)
383    {
384        return 24;
385    }
386
387    /**
388     * Returns the number of minutes in an hour
389     * @return int (60)
390     * @access protected
391     */
392    function getMinutesInHour($y=null,$m=null,$d=null,$h=null)
393    {
394        return 60;
395    }
396
397    /**
398     * Returns the number of seconds in a minutes
399     * @return int (60)
400     * @access protected
401     */
402    function getSecondsInMinute($y=null,$m=null,$d=null,$h=null,$i=null)
403    {
404        return 60;
405    }
406}
407?>
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