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81 lines
2.0 KiB
81 lines
2.0 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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class CSetParser extends CParser {
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/**
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* Array of string to search for with strings as keys.
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*
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* @var array
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*/
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private $needles = [];
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/**
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* Array of chars that are used in the given strings with chars as keys.
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*
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* @var array
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*/
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private $chars = [];
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/**
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* Array of strings to search for.
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*
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* @param array $needles
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*/
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public function __construct(array $needles) {
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$this->needles = array_flip($needles);
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$this->chars = array_flip(str_split(implode($needles)));
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}
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/**
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* Find one of the given strings at the given position.
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*
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* The parser implements a greedy algorithm, i.e., looks for the longest match.
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*/
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public function parse($source, $pos = 0) {
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$this->length = 0;
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$this->match = '';
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$length = 0;
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$match = null;
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$token = '';
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for ($p = $pos; isset($source[$p]) && isset($this->chars[$source[$p]]); $p++) {
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$token .= $source[$p];
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// when we found a match, keep looking to see of there may be a longer match
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if (isset($this->needles[$token])) {
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$length = $p - $pos + 1;
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$match = $token;
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}
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}
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if ($match === null) {
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return self::PARSE_FAIL;
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}
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$this->length = $length;
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$this->match = $match;
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return (isset($source[$pos + $this->length]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS);
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}
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}
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