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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.
**/
/**
* A parser for ranges like status codes.
*/
class CRangeParser extends CParser {
/**
* User macro parser.
*
* @var CUserMacroParser
*/
private $user_macro_parser;
/**
* LLD macro parser.
*
* @var CLLDMacroParser
*/
private $lld_macro_parser;
/**
* LLD macro function parser.
*
* @var CLLDMacroFunctionParser
*/
private $lld_macro_function_parser;
/**
* Range.
*
* @var array
*/
private $range = [];
/**
* Options to initialize other parsers.
*
* @var array
*/
private $options = [
'usermacros' => false,
'lldmacros' => false
];
/**
* @param array $options An array of options to initialize other parsers.
*/
public function __construct($options = []) {
if (array_key_exists('usermacros', $options)) {
$this->options['usermacros'] = $options['usermacros'];
}
if (array_key_exists('lldmacros', $options)) {
$this->options['lldmacros'] = $options['lldmacros'];
}
if ($this->options['usermacros']) {
$this->user_macro_parser = new CUserMacroParser();
}
if ($this->options['lldmacros']) {
$this->lld_macro_parser = new CLLDMacroParser();
$this->lld_macro_function_parser = new CLLDMacroFunctionParser();
}
}
/**
* Parse the given range.
* Examples:
* 200
* 400-500
* {$M}
* {$M}-{$M}
* {#M}-{#M}
* {$M}-{{#M}.regsub("^([0-9]+)", "{#M}: \1")}
*
* @param string $source Source string that needs to be parsed.
* @param int $pos Position offset.
*/
public function parse($source, $pos = 0) {
$this->length = 0;
$this->match = '';
$this->range = [];
// Skip spaces, tabs and new lines.
$trim = " \t\n\r";
$p = $pos;
while (isset($source[$p]) && strpos($trim, $source[$p]) !== false) {
$p++;
}
if ($this->parseConstant($source, $p) === false) {
return CParser::PARSE_FAIL;
}
while (isset($source[$p]) && strpos($trim, $source[$p]) !== false) {
$p++;
}
if (isset($source[$p]) && $source[$p] === '-') {
$p_tmp = $p;
$p++;
while (isset($source[$p]) && strpos($trim, $source[$p]) !== false) {
$p++;
}
if ($this->parseConstant($source, $p) === false) {
$p = $p_tmp;
}
else {
while (isset($source[$p]) && strpos($trim, $source[$p]) !== false) {
$p++;
}
}
}
if ($pos == $p) {
return self::PARSE_FAIL;
}
$this->length = $p - $pos;
$this->match = substr($source, $pos, $this->length);
return isset($source[$p]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS;
}
/**
* Retrieve the range.
*
* @return array
*/
public function getRange() {
return $this->range;
}
/**
* Parse user macro, or LLD macro or digits.
*
* @param string $source Source string that needs to be parsed.
* @param int $pos Position offset.
*
* @return bool
*/
private function parseConstant($source, &$pos) {
if ($this->options['usermacros'] && $this->user_macro_parser->parse($source, $pos) != self::PARSE_FAIL) {
$pos += $this->user_macro_parser->getLength();
$this->range[] = $this->user_macro_parser->getMatch();
return true;
}
if ($this->options['lldmacros'] && $this->lld_macro_parser->parse($source, $pos) != self::PARSE_FAIL) {
$pos += $this->lld_macro_parser->getLength();
$this->range[] = $this->lld_macro_parser->getMatch();
return true;
}
if ($this->options['lldmacros']
&& $this->lld_macro_function_parser->parse($source, $pos) != self::PARSE_FAIL) {
$pos += $this->lld_macro_function_parser->getLength();
$this->range[] = $this->lld_macro_function_parser->getMatch();
return true;
}
return $this->parseDigits($source, $pos);
}
/**
* Parse digits.
*
* @param string $source Source string that needs to be parsed.
* @param int $pos Position offset.
*
* @return bool|array Returns false if non-numeric character found else returns array of position and match.
*/
private function parseDigits($source, &$pos) {
if (!preg_match('/^([0-9]+)/', substr($source, $pos), $matches)) {
return false;
}
if (bccomp($matches[0], ZBX_MAX_INT32) > 0) {
return false;
}
// Second value must be greater than or equal to first one.
if ($this->range && ctype_digit($this->range[0]) && $this->range[0] > $matches[0]) {
return false;
}
$pos += strlen($matches[0]);
$this->range[] = $matches[0];
return true;
}
}
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