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<?php
/*
** Copyright (C) 2001-2025 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** 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 Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/
/**
* Expression macros converter in event name field.
*/
class C52EventNameConverter extends C52TriggerExpressionConverter {
public function __construct() {
parent::__construct();
$this->parser = new C10TriggerExpression(['host_macro' => ['{HOST.HOST}']]);
}
/**
* Convert event name.
*
* @param string $event_name Event name to convert.
*
* @return string
*/
public function convert($event_name) {
$expression_macros = $this->getExpressionMacros($event_name);
krsort($expression_macros, SORT_NUMERIC);
foreach ($expression_macros as $pos => $expression_macro) {
if (($this->parser->parse(substr($expression_macro, 2, -1), 0)) !== CParser::PARSE_FAIL) {
$functions = $this->parser->result->getTokensByType(
C10TriggerExprParserResult::TOKEN_TYPE_FUNCTION_MACRO
);
foreach (array_reverse($functions) as $function) {
if ($function['data']['host'] === '{HOST.HOST}' || $function['data']['host'] === '{HOST.HOST1}') {
$function['data']['host'] = '';
}
[$new_expr] = $this->convertFunction($function['data'], '', '');
$start = $pos + $function['pos'] + 2;
$event_name = substr_replace($event_name, $new_expr, $start, strlen($function['value']));
}
}
}
return $event_name;
}
/**
* Extract expression macros with position in given string.
*
* @param string $value The string to search in.
*
* @return array
*/
private function getExpressionMacros(string $value): array {
$expr_macro = new C10ExpressionMacroParser();
$expression_macros = [];
$p = 0;
while (isset($value[$p])) {
if (substr($value, $p, 2) !== '{?') {
$p++;
continue;
}
if ($expr_macro->parse($value, $p) !== CParser::PARSE_FAIL) {
$expression_macros[$p] = $expr_macro->getMatch();
$p += $expr_macro->getLength();
}
else {
$p++;
}
}
return $expression_macros;
}
}
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