You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
2.9 KiB
121 lines
2.9 KiB
1 year ago
|
<?php
|
||
|
/*
|
||
|
** Zabbix
|
||
|
** Copyright (C) 2001-2023 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.
|
||
|
**/
|
||
|
|
||
|
|
||
|
abstract class CParser {
|
||
|
|
||
|
const PARSE_FAIL = -1;
|
||
|
const PARSE_SUCCESS = 0;
|
||
|
const PARSE_SUCCESS_CONT = 1;
|
||
|
|
||
|
protected $length = 0;
|
||
|
protected $match = '';
|
||
|
protected $error_source = false;
|
||
|
protected $error_pos = 0;
|
||
|
protected $error_msgs = [
|
||
|
'empty' => 'string is empty',
|
||
|
'unexpected_end' => 'unexpected end of string'
|
||
|
];
|
||
|
|
||
|
/**
|
||
|
* Try to parse the string starting from the given position.
|
||
|
*
|
||
|
* @param string $source string to parse
|
||
|
* @param int $pos position to start from
|
||
|
*
|
||
|
* @return int
|
||
|
*/
|
||
|
abstract public function parse($source, $pos = 0);
|
||
|
|
||
|
/**
|
||
|
* Returns length of the parsed element.
|
||
|
*
|
||
|
* @return int
|
||
|
*/
|
||
|
public function getLength() {
|
||
|
return $this->length;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Returns parsed element.
|
||
|
*
|
||
|
* @return string
|
||
|
*/
|
||
|
public function getMatch() {
|
||
|
return $this->match;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Returns the error message if string is invalid.
|
||
|
*
|
||
|
* @return string
|
||
|
*/
|
||
|
public function getError(): string {
|
||
|
if ($this->error_source === false) {
|
||
|
return '';
|
||
|
}
|
||
|
|
||
|
if (!isset($this->error_source[$this->error_pos])) {
|
||
|
return ($this->error_pos == 0) ? $this->error_msgs['empty'] : $this->error_msgs['unexpected_end'];
|
||
|
}
|
||
|
|
||
|
// The error message is prepared here to avoid extra calculations if the error message is not used.
|
||
|
return $this->errorPosMessage($this->error_source, $this->error_pos);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Save error source string and position for later use, when error will be retrieved.
|
||
|
*
|
||
|
* @param string $source
|
||
|
* @param int $pos
|
||
|
*/
|
||
|
protected function errorPos($source, $pos): void {
|
||
|
$this->error_source = $source;
|
||
|
$this->error_pos = $pos;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Clears error, when parse is used multiple times with same parser.
|
||
|
*/
|
||
|
protected function errorClear(): void {
|
||
|
$this->error_source = false;
|
||
|
$this->error_pos = 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Prepares error message for incorrect syntax at position.
|
||
|
*
|
||
|
* @param string $source
|
||
|
* @param int $pos
|
||
|
*
|
||
|
* @return string
|
||
|
*/
|
||
|
protected function errorPosMessage($source, $pos): string {
|
||
|
$maxChunkSize = 50;
|
||
|
$chunk = substr($source, $pos);
|
||
|
|
||
|
if (mb_strlen($chunk) > $maxChunkSize) {
|
||
|
$chunk = mb_substr($chunk, 0, $maxChunkSize) . ' ...';
|
||
|
}
|
||
|
|
||
|
return _s('incorrect syntax near "%1$s"', $chunk);
|
||
|
}
|
||
|
}
|