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<?php
/*
** Zabbix
** Copyright (C) 2001-2018 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 class for creating conditions.
*/
class CConditionHelper {
/**
* Generate a numeric formula from conditions $conditions with respect to evaluation type $evalType.
* Each condition must have a condition type, that will be used for grouping.
*
* Supported $evalType values:
* - CONDITION_EVAL_TYPE_AND_OR
* - CONDITION_EVAL_TYPE_AND
* - CONDITION_EVAL_TYPE_OR
*
* Example:
* echo CFormulaHelper::getFormula(array(
* 1 => 'condition1',
* 2 => 'condition1',
* 5 => 'condition2'
* ), CONDITION_EVAL_TYPE_AND_OR);
*
* // ({1} or {2}) and {5}
*
* Keep in sync with JS getConditionFormula().
*
* @param array $conditions conditions with IDs as keys and condition type with values
* @param int $evalType
*
* @return string
*/
public static function getFormula(array $conditions, $evalType) {
$groupedConditions = [];
foreach ($conditions as $id => $condition) {
$groupedConditions[$condition][] = '{'.$id.'}';
}
// operators
switch ($evalType) {
case CONDITION_EVAL_TYPE_AND:
$conditionOperator = 'and';
$groupOperator = $conditionOperator;
break;
case CONDITION_EVAL_TYPE_OR:
$conditionOperator = 'or';
$groupOperator = $conditionOperator;
break;
default:
$conditionOperator = 'or';
$groupOperator = 'and';
break;
}
$groupFormulas = [];
foreach ($groupedConditions as $conditionIds) {
if (count($conditionIds) > 1) {
$groupFormulas[] = '('.implode(' '.$conditionOperator.' ', $conditionIds).')';
}
else {
$groupFormulas[] = $conditionIds[0];
}
}
$formula = implode(' '.$groupOperator.' ', $groupFormulas);
// strip parentheses if there's only one condition group
if (count($groupedConditions) == 1) {
$formula = trim($formula, '()');
}
return $formula;
}
/**
* Extract the numeric IDs used in the given formula and generate a set of letter aliases for them.
* Aliases will be generated in the order they appear in the formula.
*
* Example:
* var_dump(CFormulaHelper::getFormulaIds('1 or (2 and 3) or 2'));
*
* // array(1 => 'A', 2 => 'B', 3 => 'C')
*
* @param string $formula a formula with numeric IDs
*
* @return array
*/
public static function getFormulaIds($formula) {
$matches = [];
preg_match_all('/\d+/', $formula, $matches);
$ids = array_keys(array_flip($matches[0]));
$i = 0;
$formulaIds = [];
foreach ($ids as $id) {
$formulaIds[$id] = num2letter($i);
$i++;
}
return $formulaIds;
}
/**
* Replace numeric IDs with formula IDs using the pairs given in $ids.
*
* @param string $formula
* @param array $ids array of numeric ID - formula ID pairs
*
* @return string
*/
public static function replaceNumericIds($formula, array $ids) {
foreach ($ids as $id => $formulaId) {
$formula = str_replace('{'.$id.'}', $formulaId, $formula);
}
return $formula;
}
/**
* Replace formula IDs with numeric IDs using the pairs given in $ids.
*
* Notes:
* - $formula must be valid before the function call
* - $ids must contain all constants used in the $formula
*
* @param string $formula
* @param array $ids array of formula ID - numeric ID pairs
*
* @return string
*/
public static function replaceLetterIds($formula, array $ids) {
$parser = new CConditionFormula();
$parser->parse($formula);
foreach (array_reverse($parser->constants) as $constant) {
$formula = substr_replace($formula, '{'.$ids[$constant['value']].'}', $constant['pos'],
strlen($constant['value'])
);
}
return $formula;
}
/**
* Sort conditions by formula id as if they were numbers.
*
* @param array $conditions conditions
* @return array
*/
public static function sortConditionsByFormulaId($conditions) {
uasort($conditions, function ($condition1, $condition2) {
return CConditionHelper::compareFormulaIds($condition1['formulaid'], $condition2['formulaid']);
});
return $conditions;
}
/**
* Compare formula IDs.
*
* @param string $formulaId1
* @param string $formulaId2
*
* @return int
*/
public static function compareFormulaIds($formulaId1, $formulaId2) {
$len1 = strlen($formulaId1);
$len2 = strlen($formulaId2);
if ($len1 == $len2) {
return strcmp($formulaId1, $formulaId2);
}
else {
return ($len1 < $len2) ? -1 : 1;
}
}
/**
* Returns next formula ID - A => B, B => C, ..., Z => AA, ..., ZZ => AAA, ...
*
* @param array $formulaIds
*
* @return string
*/
public static function getNextFormulaId(array $formulaIds) {
if (!$formulaIds) {
$nextFormulaId = 'A';
}
else {
usort($formulaIds, ['CConditionHelper', 'compareFormulaIds']);
$lastFormulaId = array_pop($formulaIds);
$calculateNextFormulaId = function($formulaId) use (&$calculateNextFormulaId) {
$head = substr($formulaId, 0, -1);
$tail = substr($formulaId, -1);
if ($tail == 'Z') {
$nextFormulaId = $head ? $calculateNextFormulaId($head).'A' : 'AA';
}
else {
$nextFormulaId = $head.chr(ord($tail) + 1);
}
return $nextFormulaId;
};
$nextFormulaId = $calculateNextFormulaId($lastFormulaId);
}
return $nextFormulaId;
}
}
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