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<?php
/*
** Zabbix
** Copyright (C) 2001-2014 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 custom macros.
*/
class CMacroParser extends CParser {
/**
* A character that must be present right after the opening curly brace.
*
* For example "$" for user macros like "{$MACRO}".
*
* @var string
*/
protected $prefixChar;
/**
* @param string $prefixChar
*/
public function __construct($prefixChar) {
$this->prefixChar = $prefixChar;
}
/**
* @param string $source
* @param int $startPos
*
* @return bool|CParserResult
*/
public function parse($source, $startPos = 0) {
$this->pos = $startPos;
if (!isset($source[$this->pos]) || $source[$this->pos] != '{') {
return false;
}
$this->pos++;
if (!isset($source[$this->pos]) || $source[$this->pos] !== $this->prefixChar) {
return false;
}
$this->pos++;
// make sure there's at least one valid macro char
if (!isset($source[$this->pos]) || !$this->isMacroChar($source[$this->pos])) {
return false;
}
$this->pos++;
// skip the remaining macro chars
while (isset($source[$this->pos]) && $this->isMacroChar($source[$this->pos])) {
$this->pos++;
}
if (!isset($source[$this->pos]) || $source[$this->pos] != '}') {
return false;
}
$macroLength = $this->pos - $startPos + 1;
$result = new CParserResult();
$result->source = $source;
$result->pos = $startPos;
$result->length = $macroLength;
$result->match = substr($source, $startPos, $macroLength);
return $result;
}
/**
* Returns true if the char is allowed in the macro, false otherwise
*
* @param string $c
*
* @return bool
*/
private function isMacroChar($c) {
if (($c >= 'A' && $c <= 'Z') || $c == '.' || $c == '_' || ($c >= '0' && $c <= '9')) {
return true;
}
return false;
}
}
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