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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 scheduling intervals.
*/
class CSchedulingIntervalParser extends CParser {
private $options = [
'usermacros' => false,
'lldmacros' => false
];
private $user_macro_parser;
private $lld_macro_parser;
private $lld_macro_function_parser;
public function __construct($options = []) {
if (array_key_exists('usermacros', $options)) {
$this->options['usermacros'] = $options['usermacros'];
}
if (array_key_exists('lldmacros', $options)) {
$this->options['lldmacros'] = $options['lldmacros'];
}
if ($this->options['usermacros']) {
$this->user_macro_parser = new CUserMacroParser();
}
if ($this->options['lldmacros']) {
$this->lld_macro_parser = new CLLDMacroParser();
$this->lld_macro_function_parser = new CLLDMacroFunctionParser();
}
}
/**
* Parse the given scheduled interval.
*
* @param string $source Source string that needs to be parsed.
* @param int $pos Position offset.
*/
public function parse($source, $pos = 0) {
$this->length = 0;
$this->match = '';
$p = $pos;
if ($this->options['usermacros'] && $this->user_macro_parser->parse($source, $p) != self::PARSE_FAIL) {
$p += $this->user_macro_parser->getLength();
}
elseif ($this->options['lldmacros'] && $this->lld_macro_parser->parse($source, $p) != self::PARSE_FAIL) {
$p += $this->lld_macro_parser->getLength();
}
elseif ($this->options['lldmacros']
&& $this->lld_macro_function_parser->parse($source, $p) != self::PARSE_FAIL) {
$p += $this->lld_macro_function_parser->getLength();
}
elseif (!self::parseIntervals($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 multiple intervals.
*
* @param string $source
* @param int $pos
*
* @return bool
*/
private static function parseIntervals($source, &$pos) {
$p = $pos;
$precedence = 0;
$prefixes = [
0 => ['prefix' => 'md', 'min' => 1, 'max' => 31],
1 => ['prefix' => 'wd', 'min' => 1, 'max' => 7],
2 => ['prefix' => 'h', 'min' => 0, 'max' => 23],
3 => ['prefix' => 'm', 'min' => 0, 'max' => 59],
4 => ['prefix' => 's', 'min' => 0, 'max' => 59]
];
while (isset($source[$p])) {
for ($i = $precedence; $i < count($prefixes); $i++) {
$prefix = $prefixes[$i];
if (self::parseInterval($source, $p, $prefix['prefix'], $prefix['min'], $prefix['max'])) {
$precedence = $i + 1;
continue 2;
}
}
break;
}
$ret = ($p != $pos);
$pos = $p;
return $ret;
}
/**
* Parse single interval.
*
* @param string $source
* @param int $pos
* @param string $prefix
* @param int $min
* @param int $max
*
* @return bool
*/
private static function parseInterval($source, &$pos, $prefix, $min, $max) {
$p = $pos;
$len = strlen($prefix);
if (substr($source, $p, $len) !== $prefix) {
return false;
}
$p += $len;
if (!self::parseFilter($source, $p, $min, $max)) {
return false;
}
$pos = $p;
return true;
}
/**
* Detect and move position at the end of filter.
*/
private static function parseFilter($source, &$pos, $min, $max) {
$p = $pos;
$max_digits = strlen((string) $max);
$pattern_range = '(?<from>[0-9]{1,'.$max_digits.'})(-(?P<to>[0-9]{1,'.$max_digits.'}))?';
$pattern_step = '\/(?P<step>[0-9]{1,'.$max_digits.'})';
$delimiter = '';
while (isset($source[$p])) {
$len = 0;
if (preg_match('/^'.$delimiter.$pattern_range.'/', substr($source, $p), $matches)) {
$from = $matches['from'];
$to = (array_key_exists('to', $matches) && $matches['to'] !== '') ? $matches['to'] : $from;
if ($from < $min || $to > $max || $from > $to) {
break;
}
$len += strlen($matches[0]);
$delimiter = '';
}
else {
$from = $min;
$to = $max;
}
if (preg_match('/^'.$delimiter.$pattern_step.'/', substr($source, $p + $len), $matches)) {
if ($matches['step'] >= 1 && $matches['step'] <= $to - $from) {
$len += strlen($matches[0]);
}
}
if ($len == 0) {
break;
}
$p += $len;
$delimiter = ',';
}
$ret = ($p != $pos);
$pos = $p;
return $ret;
}
}
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