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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',
+ TS_DB2 => '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
+ );
+
+ /**
+ * 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.
+ *
+ * @param $timestamp bool|string 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.
+ *
+ * @param $ts string|bool 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, $da ) ) {
+ # TS_POSTGRES
+ } elseif (preg_match( '/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.\d\d\d$/', $ts, $da ) ) {
+ # TS_DB2
+ } 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 );
+ }
+
+ if( function_exists( "date_create" ) ) {
+ try {
+ $final = new DateTime( $strtime, new DateTimeZone( 'GMT' ) );
+ } catch(Exception $e) {
+ throw new TimestampException( __METHOD__ . ' Invalid timestamp format.' );
+ }
+ } else {
+ $final = strtotime( $strtime );
+ }
+
+ 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.
+ *
+ * @param $style int 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.
+ *
+ * @return string 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 );
+ } else {
+ return wfMessage( 'just-now' );
+ }
+ }
+
+ /**
+ * @return string
+ */
+ public function __toString() {
+ return $this->getTimestamp();
+ }
+}
+
+class TimestampException extends MWException {}