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202 lines
4.9 KiB
202 lines
4.9 KiB
1 year ago
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<?php
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* A parser for scheduling intervals.
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*/
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class CSchedulingIntervalParser extends CParser {
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private $options = [
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'usermacros' => false,
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'lldmacros' => false
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];
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private $user_macro_parser;
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private $lld_macro_parser;
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private $lld_macro_function_parser;
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public function __construct($options = []) {
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if (array_key_exists('usermacros', $options)) {
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$this->options['usermacros'] = $options['usermacros'];
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}
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if (array_key_exists('lldmacros', $options)) {
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$this->options['lldmacros'] = $options['lldmacros'];
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}
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if ($this->options['usermacros']) {
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$this->user_macro_parser = new CUserMacroParser();
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}
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if ($this->options['lldmacros']) {
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$this->lld_macro_parser = new CLLDMacroParser();
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$this->lld_macro_function_parser = new CLLDMacroFunctionParser();
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}
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}
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/**
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* Parse the given scheduled interval.
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*
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* @param string $source Source string that needs to be parsed.
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* @param int $pos Position offset.
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*/
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public function parse($source, $pos = 0) {
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$this->length = 0;
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$this->match = '';
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$p = $pos;
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if ($this->options['usermacros'] && $this->user_macro_parser->parse($source, $p) != self::PARSE_FAIL) {
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$p += $this->user_macro_parser->getLength();
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}
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elseif ($this->options['lldmacros'] && $this->lld_macro_parser->parse($source, $p) != self::PARSE_FAIL) {
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$p += $this->lld_macro_parser->getLength();
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}
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elseif ($this->options['lldmacros']
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&& $this->lld_macro_function_parser->parse($source, $p) != self::PARSE_FAIL) {
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$p += $this->lld_macro_function_parser->getLength();
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}
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elseif (!self::parseIntervals($source, $p)) {
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return self::PARSE_FAIL;
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}
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$this->length = $p - $pos;
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$this->match = substr($source, $pos, $this->length);
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return isset($source[$p]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS;
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}
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/**
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* Parse multiple intervals.
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*
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* @param string $source
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* @param int $pos
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*
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* @return bool
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*/
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private static function parseIntervals($source, &$pos) {
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$p = $pos;
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$precedence = 0;
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$prefixes = [
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0 => ['prefix' => 'md', 'min' => 1, 'max' => 31],
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1 => ['prefix' => 'wd', 'min' => 1, 'max' => 7],
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2 => ['prefix' => 'h', 'min' => 0, 'max' => 23],
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3 => ['prefix' => 'm', 'min' => 0, 'max' => 59],
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4 => ['prefix' => 's', 'min' => 0, 'max' => 59]
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];
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while (isset($source[$p])) {
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for ($i = $precedence; $i < count($prefixes); $i++) {
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$prefix = $prefixes[$i];
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if (self::parseInterval($source, $p, $prefix['prefix'], $prefix['min'], $prefix['max'])) {
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$precedence = $i + 1;
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continue 2;
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}
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}
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break;
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}
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$ret = ($p != $pos);
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$pos = $p;
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return $ret;
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}
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/**
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* Parse single interval.
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*
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* @param string $source
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* @param int $pos
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* @param string $prefix
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* @param int $min
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* @param int $max
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*
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* @return bool
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*/
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private static function parseInterval($source, &$pos, $prefix, $min, $max) {
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$p = $pos;
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$len = strlen($prefix);
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if (substr($source, $p, $len) !== $prefix) {
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return false;
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}
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$p += $len;
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if (!self::parseFilter($source, $p, $min, $max)) {
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return false;
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}
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$pos = $p;
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return true;
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}
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/**
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* Detect and move position at the end of filter.
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*/
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private static function parseFilter($source, &$pos, $min, $max) {
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$p = $pos;
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$max_digits = strlen((string) $max);
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$pattern_range = '(?<from>[0-9]{1,'.$max_digits.'})(-(?P<to>[0-9]{1,'.$max_digits.'}))?';
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$pattern_step = '\/(?P<step>[0-9]{1,'.$max_digits.'})';
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$delimiter = '';
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while (isset($source[$p])) {
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$len = 0;
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if (preg_match('/^'.$delimiter.$pattern_range.'/', substr($source, $p), $matches)) {
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$from = $matches['from'];
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$to = (array_key_exists('to', $matches) && $matches['to'] !== '') ? $matches['to'] : $from;
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if ($from < $min || $to > $max || $from > $to) {
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break;
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}
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$len += strlen($matches[0]);
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$delimiter = '';
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}
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else {
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$from = $min;
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$to = $max;
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}
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if (preg_match('/^'.$delimiter.$pattern_step.'/', substr($source, $p + $len), $matches)) {
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if ($matches['step'] >= 1 && $matches['step'] <= $to - $from) {
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$len += strlen($matches[0]);
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}
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}
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if ($len == 0) {
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break;
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}
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$p += $len;
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$delimiter = ',';
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}
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$ret = ($p != $pos);
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$pos = $p;
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return $ret;
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}
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}
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