/**
* Convert graph items elements.
*
* @param array $graph_items
*
* @return array
*/
protected function convertGraphItems(array $graph_items)
{
foreach ($graph_items as &$graph_item) {
$graph_item['item']['key'] = $this->itemKeyConverter->convert($graph_item['item']['key']);
}
unset($graph_item);
return $graph_items;
}
/**
* 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;
}
