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138 lines
3.6 KiB
138 lines
3.6 KiB
<?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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* Trigger expression converter from 2.2 to 2.4.
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*/
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class C20TriggerConverter extends CConverter {
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/**
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* A parser for function macros.
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*
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* @var C10FunctionMacroParser
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*/
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protected $function_macro_parser;
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/**
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* A parser for LLD macros.
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*
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* @var CLLDMacroParser
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*/
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protected $lld_macro_parser;
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/**
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* An item key converter.
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*
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* @var C20ItemKeyConverter
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*/
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protected $itemKeyConverter;
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public function __construct() {
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$this->function_macro_parser = new C10FunctionMacroParser();
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$this->lld_macro_parser = new CLLDMacroParser();
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$this->itemKeyConverter = new C20ItemKeyConverter();
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}
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/**
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* Convert a trigger expression from 2.2 format to 2.4.
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*
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* The method will replace old operators with their analogues: "&" with "and", "|" - "or" and "#" - "<>".
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*
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* @param string $expression
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*
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* @return string
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*/
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public function convert($expression) {
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// find all the operators that need to be replaced
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$found_operators = [];
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for ($pos = 0; isset($expression[$pos]); $pos++) {
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switch ($expression[$pos]) {
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case '{':
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// skip function macros
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if ($this->function_macro_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
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$new_expression = '{'.
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$this->function_macro_parser->getHost().':'.
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$this->itemKeyConverter->convert($this->function_macro_parser->getItem()).'.'.
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$this->function_macro_parser->getFunction().
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'}';
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$expression = substr_replace($expression, $new_expression, $pos,
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$this->function_macro_parser->getLength()
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);
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$pos += strlen($new_expression) - 1;
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}
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else {
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// if it's not a function macro, try to parse it as an LLD macro
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if ($this->lld_macro_parser->parse($expression, $pos) != CParser::PARSE_FAIL) {
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$pos += $this->lld_macro_parser->getLength() - 1;
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}
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}
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// otherwise just continue as is, other macros don't contain any of these characters
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break;
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case '&':
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case '|':
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case '#':
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$found_operators[$pos] = $expression[$pos];
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break;
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}
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}
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// replace the operators
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foreach (array_reverse($found_operators, true) as $pos => $operator) {
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switch ($operator) {
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case '&':
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$expression = $this->replaceLogicalOperator($expression, 'and', $pos);
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break;
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case '|':
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$expression = $this->replaceLogicalOperator($expression, 'or', $pos);
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break;
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case '#':
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$expression = substr_replace($expression, '<>', $pos, 1);
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break;
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}
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}
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return $expression;
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}
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/**
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* Replaces an operator at the given position and removes extra spaces around it.
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*
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* @param string $expression
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* @param string $newOperator
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* @param int $pos
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*
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* @return string
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*/
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protected function replaceLogicalOperator($expression, $newOperator, $pos) {
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$left = substr($expression, 0, $pos);
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$right = substr($expression, $pos + 1);
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return rtrim($left).' '.$newOperator.' '.ltrim($right);
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}
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}
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