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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.
**/
class CMacroParser extends CParser {
/**
* Macro name.
*
* @var string
*/
private $macro;
/**
* Reference number.
*
* @var int
*/
private $n;
/**
* @var CSetParser
*/
private $set_parser;
/**
* An options array.
*
* Supported options:
* 'allow_reference' => true support of reference {MACRO<1-9>}
*
* @var array
*/
private $options = ['allow_reference' => false];
/**
* Array of strings to search for.
*
* @param array $macros the list of macros, for example ['{ITEM.VALUE}', '{HOST.HOST}']
* @param array $options
*/
public function __construct(array $macros, array $options = []) {
$this->set_parser = new CSetParser(array_map(function($macro) { return substr($macro, 1, -1); }, $macros));
if (array_key_exists('allow_reference', $options)) {
$this->options['allow_reference'] = $options['allow_reference'];
}
}
/**
* Find one of the given strings at the given position.
*
* The parser implements a greedy algorithm, i.e., looks for the longest match.
*/
public function parse($source, $pos = 0) {
$this->length = 0;
$this->match = '';
$this->macro = '';
$this->n = 0;
$p = $pos;
if (!isset($source[$p]) || $source[$p] != '{') {
return self::PARSE_FAIL;
}
$p++;
if ($this->set_parser->parse($source, $p) == self::PARSE_FAIL) {
return self::PARSE_FAIL;
}
$p += $this->set_parser->getLength();
if ($this->options['allow_reference']) {
if (isset($source[$p]) && $source[$p] >= '1' && $source[$p] <= '9') {
$this->n = (int) $source[$p];
$p++;
}
}
if (!isset($source[$p]) || $source[$p] != '}') {
$this->n = 0;
return self::PARSE_FAIL;
}
$p++;
$this->length = $p - $pos;
$this->match = substr($source, $pos, $this->length);
$this->macro = $this->set_parser->getMatch();
return (isset($source[$pos + $this->length]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS);
}
/**
* Returns the macro name like HOST.HOST.
*
* @return string
*/
public function getMacro() {
return $this->macro;
}
/**
* Returns the reference.
*
* @return int
*/
public function getN() {
return $this->n;
}
}
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