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