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242 lines
5.8 KiB
242 lines
5.8 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 ranges like status codes.
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*/
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class CRangeParser extends CParser {
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/**
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* User macro parser.
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*
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* @var CUserMacroParser
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*/
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private $user_macro_parser;
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/**
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* LLD macro parser.
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*
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* @var CLLDMacroParser
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*/
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private $lld_macro_parser;
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/**
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* LLD macro function parser.
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*
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* @var CLLDMacroFunctionParser
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*/
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private $lld_macro_function_parser;
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/**
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* Number parser.
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*
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* @var CNumberParser
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*/
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private $number_parser;
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/**
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* Array of range strings. Range value with suffix will be stored as string of calculated value, value "1K"
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* will be stored as "1024".
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*
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* @var array
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*/
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private $range = [];
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/**
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* Options to initialize other parsers.
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*
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* usermacros Allow usermacros in ranges.
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* lldmacros Allow lldmacros in ranges.
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* with_minus Allow negative ranges.
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* with_float Allow float number ranges.
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* with_suffix Allow number ranges with size and time suffixes.
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*
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* @var array
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*/
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private $options = [
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'usermacros' => false,
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'lldmacros' => false,
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'with_minus' => false,
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'with_float' => false,
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'with_suffix' => false
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];
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/**
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* @param array $options An array of options to initialize other parsers.
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*/
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public function __construct($options = []) {
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$this->options = $options + $this->options;
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$this->number_parser = new CNumberParser([
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'with_minus' => $this->options['with_minus'],
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'with_float' => $this->options['with_float'],
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'with_size_suffix' => $this->options['with_suffix'],
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'with_time_suffix' => $this->options['with_suffix']
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]);
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if ($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 range.
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* Examples:
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* 200
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* 400-500
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* {$M}
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* {$M}-{$M}
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* {#M}-{#M}
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* {$M}-{{#M}.regsub("^([0-9]+)", "{#M}: \1")}
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* -200--10
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* -2.5--1.35
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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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$this->match = '';
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$this->range = [];
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// Skip spaces, tabs and new lines.
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$trim = " \t\n\r";
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$p = $pos;
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while (isset($source[$p]) && strpos($trim, $source[$p]) !== false) {
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$p++;
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}
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if ($this->parseConstant($source, $p) === false) {
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return CParser::PARSE_FAIL;
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}
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while (isset($source[$p]) && strpos($trim, $source[$p]) !== false) {
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$p++;
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}
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if (isset($source[$p]) && $source[$p] === '-') {
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$p_tmp = $p;
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$p++;
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while (isset($source[$p]) && strpos($trim, $source[$p]) !== false) {
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$p++;
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}
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if ($this->parseConstant($source, $p) === false) {
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$p = $p_tmp;
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}
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else {
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while (isset($source[$p]) && strpos($trim, $source[$p]) !== false) {
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$p++;
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}
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}
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}
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if ($pos == $p) {
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return self::PARSE_FAIL;
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}
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$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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* Retrieve the range.
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*
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* @return array
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*/
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public function getRange() {
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return $this->range;
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}
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/**
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* Parse user macro, or LLD macro or digits.
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*
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* @param string $source Source string that needs to be parsed.
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* @param int $pos Position offset.
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*
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* @return bool
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*/
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private function parseConstant($source, &$pos) {
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if ($this->options['usermacros'] && $this->user_macro_parser->parse($source, $pos) != self::PARSE_FAIL) {
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$pos += $this->user_macro_parser->getLength();
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$this->range[] = $this->user_macro_parser->getMatch();
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return true;
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}
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if ($this->options['lldmacros'] && $this->lld_macro_parser->parse($source, $pos) != self::PARSE_FAIL) {
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$pos += $this->lld_macro_parser->getLength();
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$this->range[] = $this->lld_macro_parser->getMatch();
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return true;
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}
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if ($this->options['lldmacros']
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&& $this->lld_macro_function_parser->parse($source, $pos) != self::PARSE_FAIL) {
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$pos += $this->lld_macro_function_parser->getLength();
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$this->range[] = $this->lld_macro_function_parser->getMatch();
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return true;
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}
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return $this->parseDigits($source, $pos);
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}
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/**
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* Parse digits.
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*
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* @param string $source Source string that needs to be parsed.
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* @param int $pos Position offset.
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*
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* @return bool|array Returns false if non-numeric character found else returns array of position and match.
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*/
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private function parseDigits($source, &$pos) {
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if ($this->number_parser->parse($source, $pos) == CParser::PARSE_FAIL) {
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return false;
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}
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$value = $this->number_parser->calcValue();
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if ($value > ZBX_MAX_INT32) {
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return false;
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}
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// Second value must be greater than or equal to first one.
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if ($this->range && is_numeric($this->range[0]) && $this->range[0] > $value) {
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return false;
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}
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$pos += $this->number_parser->getLength();
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$this->range[] = ($this->number_parser->getSuffix() === null)
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? $this->number_parser->getMatch()
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: strval($value);
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return true;
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}
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}
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