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<?php
/**
* Creation and parsing of MW-style timestamps.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @since 1.20
* @author Tyler Romeo, 2012
*/
/**
* Library for creating and parsing MW-style timestamps. Based on the JS
* library that does the same thing.
*
* @since 1.20
*/
class MWTimestamp {
/**
* Standard gmdate() formats for the different timestamp types.
*/
private static $formats = array(
TS_UNIX => 'U',
TS_MW => 'YmdHis',
TS_DB => 'Y-m-d H:i:s',
TS_ISO_8601 => 'Y-m-d\TH:i:s\Z',
TS_ISO_8601_BASIC => 'Ymd\THis\Z',
TS_EXIF => 'Y:m:d H:i:s', // This shouldn't ever be used, but is included for completeness
TS_RFC2822 => 'D, d M Y H:i:s',
TS_ORACLE => 'd-m-Y H:i:s.000000', // Was 'd-M-y h.i.s A' . ' +00:00' before r51500
TS_POSTGRES => 'Y-m-d H:i:s',
);
/**
* Different units for human readable timestamps.
* @see MWTimestamp::getHumanTimestamp
*/
private static $units = array(
"milliseconds" => 1,
"seconds" => 1000, // 1000 milliseconds per second
"minutes" => 60, // 60 seconds per minute
"hours" => 60, // 60 minutes per hour
"days" => 24, // 24 hours per day
"months" => 30, // approximately 30 days per month
"years" => 12, // 12 months per year
);
/**
* The actual timestamp being wrapped. Either a DateTime
* object or a string with a Unix timestamp depending on
* PHP.
* @var string|DateTime
*/
private $timestamp;
/**
* Make a new timestamp and set it to the specified time,
* or the current time if unspecified.
*
* @since 1.20
*
* @param bool|string $timestamp Timestamp to set, or false for current time
*/
public function __construct( $timestamp = false ) {
$this->setTimestamp( $timestamp );
}
/**
* Set the timestamp to the specified time, or the current time if unspecified.
*
* Parse the given timestamp into either a DateTime object or a Unix timestamp,
* and then store it.
*
* @since 1.20
*
* @param string|bool $ts Timestamp to store, or false for now
* @throws TimestampException
*/
public function setTimestamp( $ts = false ) {
$da = array();
$strtime = '';
if ( !$ts || $ts === "\0\0\0\0\0\0\0\0\0\0\0\0\0\0" ) { // We want to catch 0, '', null... but not date strings starting with a letter.
$uts = time();
$strtime = "@$uts";
} elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D', $ts, $da ) ) {
# TS_DB
} elseif ( preg_match( '/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D', $ts, $da ) ) {
# TS_EXIF
} elseif ( preg_match( '/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D', $ts, $da ) ) {
# TS_MW
} elseif ( preg_match( '/^-?\d{1,13}$/D', $ts ) ) {
# TS_UNIX
$strtime = "@$ts"; // http://php.net/manual/en/datetime.formats.compound.php
} elseif ( preg_match( '/^\d{2}-\d{2}-\d{4} \d{2}:\d{2}:\d{2}.\d{6}$/', $ts ) ) {
# TS_ORACLE // session altered to DD-MM-YYYY HH24:MI:SS.FF6
$strtime = preg_replace( '/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
str_replace( '+00:00', 'UTC', $ts ) );
} elseif ( preg_match( '/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.*\d*)?Z$/', $ts, $da ) ) {
# TS_ISO_8601
} elseif ( preg_match( '/^(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})(\d{2})(?:\.*\d*)?Z$/', $ts, $da ) ) {
#TS_ISO_8601_BASIC
} elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d*[\+\- ](\d\d)$/', $ts, $da ) ) {
# TS_POSTGRES
} elseif ( preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d* GMT$/', $ts, $da ) ) {
# TS_POSTGRES
} elseif ( preg_match( '/^[ \t\r\n]*([A-Z][a-z]{2},[ \t\r\n]*)?' . # Day of week
'\d\d?[ \t\r\n]*[A-Z][a-z]{2}[ \t\r\n]*\d{2}(?:\d{2})?' . # dd Mon yyyy
'[ \t\r\n]*\d\d[ \t\r\n]*:[ \t\r\n]*\d\d[ \t\r\n]*:[ \t\r\n]*\d\d/S', $ts ) ) { # hh:mm:ss
# TS_RFC2822, accepting a trailing comment. See http://www.squid-cache.org/mail-archive/squid-users/200307/0122.html / r77171
# The regex is a superset of rfc2822 for readability
$strtime = strtok( $ts, ';' );
} elseif ( preg_match( '/^[A-Z][a-z]{5,8}, \d\d-[A-Z][a-z]{2}-\d{2} \d\d:\d\d:\d\d/', $ts ) ) {
# TS_RFC850
$strtime = $ts;
} elseif ( preg_match( '/^[A-Z][a-z]{2} [A-Z][a-z]{2} +\d{1,2} \d\d:\d\d:\d\d \d{4}/', $ts ) ) {
# asctime
$strtime = $ts;
} else {
throw new TimestampException( __METHOD__ . " : Invalid timestamp - $ts" );
}
if( !$strtime ) {
$da = array_map( 'intval', $da );
$da[0] = "%04d-%02d-%02dT%02d:%02d:%02d.00+00:00";
$strtime = call_user_func_array( "sprintf", $da );
}
try {
$final = new DateTime( $strtime, new DateTimeZone( 'GMT' ) );
} catch(Exception $e) {
throw new TimestampException( __METHOD__ . ' Invalid timestamp format.' );
}
if( $final === false ) {
throw new TimestampException( __METHOD__ . ' Invalid timestamp format.' );
}
$this->timestamp = $final;
}
/**
* Get the timestamp represented by this object in a certain form.
*
* Convert the internal timestamp to the specified format and then
* return it.
*
* @since 1.20
*
* @param int $style Constant Output format for timestamp
* @throws TimestampException
* @return string The formatted timestamp
*/
public function getTimestamp( $style = TS_UNIX ) {
if( !isset( self::$formats[$style] ) ) {
throw new TimestampException( __METHOD__ . ' : Illegal timestamp output type.' );
}
if( is_object( $this->timestamp ) ) {
// DateTime object was used, call DateTime::format.
$output = $this->timestamp->format( self::$formats[$style] );
} elseif( TS_UNIX == $style ) {
// Unix timestamp was used and is wanted, just return it.
$output = $this->timestamp;
} else {
// Unix timestamp was used, use gmdate().
$output = gmdate( self::$formats[$style], $this->timestamp );
}
if ( ( $style == TS_RFC2822 ) || ( $style == TS_POSTGRES ) ) {
$output .= ' GMT';
}
return $output;
}
/**
* Get the timestamp in a human-friendly relative format, e.g., "3 days ago".
*
* Determine the difference between the timestamp and the current time, and
* generate a readable timestamp by returning "<N> <units> ago", where the
* largest possible unit is used.
*
* @since 1.20
*
* @return Message Formatted timestamp
*/
public function getHumanTimestamp() {
$then = $this->getTimestamp( TS_UNIX );
$now = time();
$timeago = ($now - $then) * 1000;
$message = false;
foreach( self::$units as $unit => $factor ) {
$next = $timeago / $factor;
if( $next < 1 ) {
break;
} else {
$timeago = $next;
$message = array( $unit, floor( $timeago ) );
}
}
if( $message ) {
$initial = call_user_func_array( 'wfMessage', $message );
return wfMessage( 'ago', $initial->parse() );
} else {
return wfMessage( 'just-now' );
}
}
/**
* @since 1.20
*
* @return string
*/
public function __toString() {
return $this->getTimestamp();
}
}
/**
* @since 1.20
*/
class TimestampException extends MWException {}