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<?php
/*
** Zabbix
** Copyright (C) 2001-2023 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 function macros like "{{?<trigger expression>}.func()}".
*/
class CExpressionMacroFunctionParser extends CParser {
/**
* @var CExpressionMacroParser
*/
protected $expression_macro_parser;
/**
* @var C10FunctionParser
*/
protected $function_parser;
/**
* Set up necessary parsers.
*/
public function __construct() {
$this->expression_macro_parser = new CExpressionMacroParser([
'usermacros' => true,
'lldmacros' => true,
'host_macro_n' => true,
'empty_host' => true
]);
$this->function_parser = new C10FunctionParser();
}
/**
* @param string $source
* @param int $pos
*
* @return int
*/
public function parse($source, $pos = 0) {
$this->length = 0;
$this->match = '';
$p = $pos;
if (!isset($source[$p]) || $source[$p] !== '{') {
return CParser::PARSE_FAIL;
}
$p++;
if ($this->expression_macro_parser->parse($source, $p) != CParser::PARSE_SUCCESS_CONT) {
return CParser::PARSE_FAIL;
}
$p += $this->expression_macro_parser->getLength();
if ($source[$p] !== '.') {
return CParser::PARSE_FAIL;
}
$p++;
if ($this->function_parser->parse($source, $p) == CParser::PARSE_FAIL) {
return CParser::PARSE_FAIL;
}
$p += $this->function_parser->getLength();
if (!isset($source[$p]) || $source[$p] !== '}') {
return CParser::PARSE_FAIL;
}
$p++;
$this->length = $p - $pos;
$this->match = substr($source, $pos, $this->length);
return (isset($source[$p]) ? CParser::PARSE_SUCCESS_CONT : CParser::PARSE_SUCCESS);
}
}
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