1<?php
2
3// phpcs:disable Generic.Files.LineLength.TooLong
4
5namespace dokuwiki\plugin\struct\meta;
6
7/**
8 * Class DateFormatConverter
9 *
10 * Allows conversion between the two format strings used in PHP. Not all placeholders are available in both
11 * formats. The conversion tries will use similar but not exactly the same placeholders if possible. When no suitable
12 * replacement can be found, the placeholder is removed.
13 *
14 * Do not use this where formats are used in creating machine readable data (like feeds, APIs whatever). This is
15 * only meant for cases where human read output is created.
16 *
17 * @package dokuwiki\plugin\struct\meta
18 */
19class DateFormatConverter
20{
21    protected static $strftime = [
22        // Day
23        '%a' => 'D', // An abbreviated textual representation of the day    Sun through Sat
24        '%A' => 'l', // A full textual representation of the day    Sunday through Saturday
25        '%d' => 'd', // Two-digit day of the month (with leading zeros)    01 to 31
26        '%e' => 'j', // Day of the month, with a space preceding single digits. Not implemented as described on Windows. See below for more information.    1 to 31
27        '%j' => '', // NOT SUPPORTED Day of the year, 3 digits with leading zeros    001 to 366
28        '%u' => 'N', // ISO-8601 numeric representation of the day of the week    1 (for Monday) through 7 (for Sunday)
29        '%w' => 'w', // Numeric representation of the day of the week    0 (for Sunday) through 6 (for Saturday)
30        // Week
31        '%U' => '', // NOT SUPPORTED Week number of the given year, starting with the first Sunday as the first week    13 (for the 13th full week of the year)
32        '%V' => 'W', // ISO-8601:1988 week number of the given year, starting with the first week of the year with at least 4 weekdays, with Monday being the start of the week    01 through 53 (where 53 accounts for an overlapping week)
33        '%W' => '', // NOT SUPPORTED A numeric representation of the week of the year, starting with the first Monday as the first week    46 (for the 46th week of the year beginning with a Monday)
34        // Month
35        '%b' => 'M', // Abbreviated month name, based on the locale    Jan through Dec
36        '%B' => 'F', // Full month name, based on the locale    January through December
37        '%h' => 'M', // Abbreviated month name, based on the locale (an alias of %b)    Jan through Dec
38        '%m' => 'm', // Two digit representation of the month    01 (for January) through 12 (for December)
39        // Year
40        '%C' => '', // NOT SUPPORTED Two digit representation of the century (year divided by 100, truncated to an integer)    19 for the 20th Century
41        '%g' => 'y', // Two digit representation of the year going by ISO-8601:1988 standards (see %V)    Example: 09 for the week of January 6, 2009
42        '%G' => 'Y', // The full four-digit version of %g    Example: 2008 for the week of January 3, 2009
43        '%y' => 'y', // Two digit representation of the year    Example: 09 for 2009, 79 for 1979
44        '%Y' => 'Y', // Four digit representation for the year    Example: 2038
45        // Time
46        '%H' => 'H', // Two digit representation of the hour in 24-hour format    00 through 23
47        '%k' => 'G', // Two digit representation of the hour in 24-hour format, with a space preceding single digits    0 through 23
48        '%I' => 'h', // Two digit representation of the hour in 12-hour format    01 through 12
49        '%l' => 'g', // (lower-case 'L') Hour in 12-hour format, with a space preceding single digits    1 through 12
50        '%M' => 'i', // Two digit representation of the minute    00 through 59
51        '%p' => 'A', // UPPER-CASE 'AM' or 'PM' based on the given time    Example: AM for 00:31, PM for 22:23
52        '%P' => 'a', // lower-case 'am' or 'pm' based on the given time    Example: am for 00:31, pm for 22:23
53        '%r' => 'h:i:s A', // Same as %I:%M:%S %p    Example: 09:34:17 PM for 21:34:17
54        '%R' => 'H:i', // Same as %H:%M    Example: 00:35 for 12:35 AM, 16:44for 4:44 PM
55        '%S' => 's', // Two digit representation of the second    00 through 59
56        '%T' => 'H:i:s', // Same as %H:%M:%S    Example: 21:34:17 for 09:34:17 PM
57        '%X' => 'H:i:s', // Preferred time representation based on locale, without the date    Example: 03:59:16 or 15:59:16
58        '%z' => 'z', // The time zone offset. Not implemented as described on Windows. See below for more information.    Example: -0500 for US Eastern Time
59        '%Z' => 'T', // The time zone abbreviation. Not implemented as described on Windows. See below for more information.    Example: EST for Eastern Time
60        // Time and Date Stamps
61        '%c' => 'D M j H:i:s Y', // Preferred date and time stamp based on locale    Example: Tue Feb 5 00:45:10 2009 for February 5, 2009 at 12:45:10 AM
62        '%D' => 'm/d/y', // Same as %m/%d/%y    Example: 02/05/09 for February 5, 2009
63        '%F' => 'Y/m/d', // Same as %Y-%m-%d (commonly used in database datestamps)    Example: 2009-02-05 for February 5, 2009
64        '%s' => 'U', // Unix Epoch Time timestamp (same as the time() function)    Example: 305815200 for September 10, 1979 08:40:00 AM
65        '%x' => 'm/d/y', // Preferred date representation based on locale, without the time    Example: 02/05/09 for February 5, 2009
66        // Miscellaneous
67        '%n' => "\n", // A newline character (\n)    ---
68        '%t' => "\t", // A Tab character (\t)    ---
69        '%%' => '%',
70    ];
71
72    protected static $date = [
73        // Day
74        'd' => '%d', // Day of the month, 2 digits with leading zeros    01 to 31
75        'D' => '%a', // A textual representation of a day, three letters    Mon through Sun
76        'j' => '%e', // Day of the month without leading zeros    1 to 31
77        'l' => '%A', // (lowercase 'L') A full textual representation of the day of the week    Sunday through Saturday
78        'N' => '%u', // ISO-8601 numeric representation of the day of the week (added in PHP 5.1.0)    1 (for Monday) through 7 (for Sunday)
79        'S' => '', // NOT SUPPORTED English ordinal suffix for the day of the month, 2 characters    st, nd, rd or th. Works well with j
80        'w' => '%w', // Numeric representation of the day of the week    0 (for Sunday) through 6 (for Saturday)
81        'z' => '', // NOT SUPPORTED The day of the year (starting from 0)    0 through 365
82        // Week
83        'W' => '%V', // ISO-8601 week number of year, weeks starting on Monday (added in PHP 4.1.0)    Example: 42 (the 42nd week in the year)
84        // Month
85        'F' => '%B', // A full textual representation of a month, such as January or March    January through December
86        'm' => '%m', // Numeric representation of a month, with leading zeros    01 through 12
87        'M' => '%b', // A short textual representation of a month, three letters    Jan through Dec
88        'n' => '%m', // Numeric representation of a month, without leading zeros    1 through 12
89        't' => '', // NOT SUPPORTED Number of days in the given month    28 through 31
90        // Year
91        'L' => '', // NOT SUPPORTED Whether it's a leap year    1 if it is a leap year, 0 otherwise.
92        'o' => '%g', // ISO-8601 week-numbering year. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. (added in PHP 5.1.0)    Examples: 1999or 2003
93        'Y' => '%Y', // A full numeric representation of a year, 4 digits    Examples: 1999or 2003
94        'y' => '%y', // A two digit representation of a year    Examples: 99 or03
95        // Time
96        'a' => '%P', // Lowercase Ante meridiem and Post meridiem    am or pm
97        'A' => '%p', // Uppercase Ante meridiem and Post meridiem    AM or PM
98        'B' => '', // NOT SUPPORTED Swatch Internet time    000 through 999
99        'g' => '%l', // 12-hour format of an hour without leading zeros    1 through 12
100        'G' => '%k', // 24-hour format of an hour without leading zeros    0 through 23
101        'h' => '%I', // 12-hour format of an hour with leading zeros    01 through 12
102        'H' => '%H', // 24-hour format of an hour with leading zeros    00 through 23
103        'i' => '%M', // Minutes with leading zeros    00 to 59
104        's' => '%S', // Seconds, with leading zeros    00 through 59
105        'u' => '%s000000', // Microseconds (added in PHP 5.2.2). Note that date() will always generate000000 since it takes an integer parameter, whereas DateTime::format()does support microseconds if DateTime was created with microseconds.    Example: 654321
106        // Timezone
107        'e' => '%Z', // Timezone identifier (added in PHP 5.1.0)    Examples: UTC,GMT,Atlantic/Azores
108        'I' => '', // NOT SUPPORTED (capital i) Whether or not the date is in daylight saving time    1 if Daylight Saving Time, 0otherwise.
109        'O' => '%z', // Difference to Greenwich time (GMT) in hours    Example: +0200
110        'P' => '%z', // Difference to Greenwich time (GMT) with colon between hours and minutes (added in PHP 5.1.3)    Example: +02:00
111        'T' => '%Z', // Timezone abbreviation    Examples: EST,MDT ...
112        'Z' => '', // NOT SUPPORTED Timezone offset in seconds. The offset for timezones west of UTC is always negative, and for those east of UTC is always positive.    -43200 through50400
113        // Full Date/Time
114        'c' => '', // NOT SUPPORTED ISO 8601 date (added in PHP 5)    2004-02-12T15:19:21+00:00
115        'r' => '%a, %e %b %Y %H:%M:%S %s', // » RFC 2822 formatted date    Example: Thu, 21 Dec 2000 16:01:07 +0200
116        'U' => '%s',
117    ];
118
119    /**
120     * Convert a strftime format string to a date format string
121     *
122     * @param string $strftime
123     * @return string
124     */
125    public static function toDate($strftime)
126    {
127        $date = $strftime;
128
129        /* All characters that are not strftime placeholders need to be escaped */
130        {
131            $datekeys = array_keys(self::$date);
132            // create negative lookbehind regex to match all known date chars that are not a strtime pattern now
133            $from = array_map(
134                static fn($in) => '/(?<!%)' . $in . '/',
135                $datekeys
136            );
137            // those need to be escaped
138            $to = array_map(
139                static fn($in) => '\\' . $in,
140                $datekeys
141            );
142            // escape date chars
143            $date = preg_replace($from, $to, $date);
144        }
145
146        /* strftime to date conversion */
147        {
148            $date = str_replace(
149                array_keys(self::$strftime),
150                array_values(self::$strftime),
151                $date
152            );
153        }
154
155        return $date;
156    }
157
158    /**
159     * Convert a date format string to a strftime format string
160     *
161     * @param string $date
162     * @return string
163     */
164    public static function toStrftime($date)
165    {
166        /* date to strftime conversion */
167        {
168            // create negative lookbehind regex to match all unescaped known chars
169            $from = array_keys(self::$date);
170            $from = array_map(
171                static fn($in) => '/(?<!\\\\)' . $in . '/',
172                $from
173            );
174            $to = array_values(self::$date);
175
176            // percents need escaping:
177            array_unshift($from, '/%/');
178            array_unshift($to, '%%');
179
180            // replace all the placeholders
181            $strftime = preg_replace($from, $to, $date);
182        }
183
184        /* unescape date escapes */
185        {
186            $datekeys = array_keys(self::$date);
187            $from = array_map(
188                static fn($in) => '/\\\\' . $in . '/',
189                $datekeys
190            );
191            $strftime = preg_replace($from, $datekeys, $strftime);
192        }
193
194        return $strftime;
195    }
196}
197