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<?php
/*
** Zabbix
** Copyright (C) 2001-2019 Zabbix SIA
**
** 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.
**/
/**
* A parser for absolute time in "YYYY[-MM[-DD]][ hh[:mm[:ss]]]" format.
*/
class CAbsoluteTimeParser extends CParser {
/**
* Full date in "YYYY-MM-DD hh:mm:ss" format.
*
* @var string $date
*/
private $date;
/**
* @var array $tokens
*/
private $tokens;
/**
* Parse the given period.
*
* @param string $source Source string that needs to be parsed.
* @param int $pos Position offset.
*/
public function parse($source, $pos = 0) {
$this->tokens = [];
$this->length = 0;
$this->match = '';
$this->date = '';
$p = $pos;
if (!$this->parseAbsoluteTime($source, $p)) {
return self::PARSE_FAIL;
}
$this->length = $p - $pos;
$this->match = substr($source, $pos, $this->length);
return isset($source[$p]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS;
}
/**
* Parse absolute time.
*
* @param string $source
* @param int $pos
*
* @return bool
*/
private function parseAbsoluteTime($source, &$pos) {
$pattern_Y = '(?P<Y>[12][0-9]{3})';
$pattern_m = '(?P<m>[0-9]{1,2})';
$pattern_d = '(?P<d>[0-9]{1,2})';
$pattern_H = '(?P<H>[0-9]{1,2})';
$pattern_i = '(?P<i>[0-9]{1,2})';
$pattern_s = '(?P<s>[0-9]{1,2})';
$pattern = $pattern_Y.'(-'.$pattern_m.'(-'.$pattern_d.'( +'.$pattern_H.'(:'.$pattern_i.'(:'.$pattern_s.')?)?)?)?)?';
if (!preg_match('/^'.$pattern.'/', substr($source, $pos), $matches)) {
return false;
}
foreach (['Y', 'm', 'd', 'H', 'i', 's'] as $key) {
if (array_key_exists($key, $matches)) {
$this->tokens[$key] = $matches[$key];
}
}
$matches += ['m' => 1, 'd' => 1, 'H' => 0, 'i' => 0, 's' => 0];
$date = sprintf('%04d-%02d-%02d %02d:%02d:%02d', $matches['Y'], $matches['m'], $matches['d'], $matches['H'],
$matches['i'], $matches['s']
);
$datetime = date_create($date);
if ($datetime === false || $datetime->getLastErrors()['warning_count'] != 0) {
return false;
}
$this->date = $date;
$pos += strlen($matches[0]);
return true;
}
/**
* Returns date in "YYYY-MM-DD hh:mm:ss" format.
*
* @param bool $is_start If set to true date will be modified to lowest value, example "2018" will be returned
* as "2018-01-01 00:00:00", otherwise "2018-12-31 23:59:59".
*
* @return DateTime|null
*/
public function getDateTime($is_start) {
if ($this->date === '') {
return null;
}
$date = new DateTime($this->date);
if ($is_start) {
return $date;
}
if (!array_key_exists('m', $this->tokens)) {
return $date->modify('last day of December this year 23:59:59');
}
if (!array_key_exists('d', $this->tokens)) {
return $date->modify('last day of this month 23:59:59');
}
if (!array_key_exists('H', $this->tokens)) {
return $date->modify('23:59:59');
}
if (!array_key_exists('i', $this->tokens)) {
return new DateTime($date->format('Y-m-d H:59:59'));
}
if (!array_key_exists('s', $this->tokens)) {
return new DateTime($date->format('Y-m-d H:i:59'));
}
return $date;
}
}
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