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146 lines
3.6 KiB
146 lines
3.6 KiB
<?php
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* A parser for function macros like "{?<trigger expression>}".
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*/
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class CExpressionMacroParser extends CParser {
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/**
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* @var CExpressionParser
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*/
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private $expression_parser;
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/**
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* @var string
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*/
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private $error = '';
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/**
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* @var array
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*/
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private $tokens = [];
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/**
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* An options array.
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*
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* Supported options:
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* 'usermacros' => false Enable user macros usage in expression.
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* 'lldmacros' => false Enable low-level discovery macros usage in expression.
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* 'host_macro' => false Allow {HOST.HOST} macro as host name part in the query.
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* 'host_macro_n' => false Allow {HOST.HOST} and {HOST.HOST<1-9>} macros as host name part in the query.
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* 'empty_host' => false Allow empty hostname in the query string.
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*
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* @var array
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*/
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private $options = [
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'usermacros' => false,
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'lldmacros' => false,
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'host_macro' => false,
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'host_macro_n' => false,
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'empty_host' => false
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];
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/**
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* Set up necessary parsers.
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*
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* @param array $options
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*/
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public function __construct(array $options = []) {
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$this->options = $options + $this->options;
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$this->expression_parser = new CExpressionParser([
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'usermacros' => $this->options['usermacros'],
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'lldmacros' => $this->options['lldmacros'],
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'host_macro' => $this->options['host_macro'],
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'host_macro_n' => $this->options['host_macro_n'],
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'empty_host' => $this->options['empty_host']
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]);
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}
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/**
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* @param string $source
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* @param int $pos
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*
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* @return int
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*/
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public function parse($source, $pos = 0) {
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$this->length = 0;
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$this->match = '';
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$this->error = '';
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$p = $pos;
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if (substr($source, $p, 2) !== '{?') {
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return CParser::PARSE_FAIL;
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}
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$p += 2;
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switch ($this->expression_parser->parse($source, $p)) {
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case CParser::PARSE_SUCCESS_CONT:
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$this->error = $this->expression_parser->getError();
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break;
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case CParser::PARSE_FAIL:
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$this->error = $this->expression_parser->getError();
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return CParser::PARSE_FAIL;
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}
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$p += $this->expression_parser->getLength();
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while (isset($source[$p]) && strpos(CExpressionParser::WHITESPACES, $source[$p]) !== false) {
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$p++;
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}
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if (!isset($source[$p])) {
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$this->error = _('unexpected end of expression macro');
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}
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if (!isset($source[$p]) || $source[$p] !== '}') {
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return CParser::PARSE_FAIL;
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}
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$p++;
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$this->length = $p - $pos;
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$this->match = substr($source, $pos, $this->length);
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$this->tokens = $this->expression_parser->getResult()->getTokens();
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return (isset($source[$p]) ? CParser::PARSE_SUCCESS_CONT : CParser::PARSE_SUCCESS);
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}
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/**
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* Returns the error message if the expression macro is invalid.
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*
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* @return string
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*/
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public function getError(): string {
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return $this->error;
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}
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/**
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* Returns the expression parser.
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*
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* @return CExpressionParser
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*/
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public function getExpressionParser(): CExpressionParser {
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return $this->expression_parser;
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}
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}
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