360 líneas
6,9 KiB
PHP
360 líneas
6,9 KiB
PHP
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<?php
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/**
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* SimplePie
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*
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* A PHP-Based RSS and Atom Feed Framework.
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* Takes the hard work out of managing a complete RSS/Atom solution.
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*
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* Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are
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* permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* * Neither the name of the SimplePie Team nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
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* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package SimplePie
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* @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
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* @author Ryan Parman
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* @author Sam Sneddon
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* @author Ryan McCue
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* @link http://simplepie.org/ SimplePie
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License
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*/
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/**
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* Parses the XML Declaration
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*
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* @package SimplePie
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* @subpackage Parsing
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*/
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class SimplePie_XML_Declaration_Parser
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{
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/**
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* XML Version
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*
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* @access public
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* @var string
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*/
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var $version = '1.0';
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/**
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* Encoding
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*
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* @access public
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* @var string
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*/
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var $encoding = 'UTF-8';
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/**
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* Standalone
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*
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* @access public
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* @var bool
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*/
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var $standalone = false;
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/**
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* Current state of the state machine
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*
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* @access private
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* @var string
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*/
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var $state = 'before_version_name';
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/**
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* Input data
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*
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* @access private
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* @var string
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*/
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var $data = '';
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/**
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* Input data length (to avoid calling strlen() everytime this is needed)
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*
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* @access private
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* @var int
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*/
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var $data_length = 0;
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/**
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* Current position of the pointer
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*
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* @var int
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* @access private
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*/
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var $position = 0;
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/**
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* Create an instance of the class with the input data
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*
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* @access public
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* @param string $data Input data
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*/
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public function __construct($data)
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{
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$this->data = $data;
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$this->data_length = strlen($this->data);
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}
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/**
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* Parse the input data
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*
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* @access public
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* @return bool true on success, false on failure
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*/
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public function parse()
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{
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while ($this->state && $this->state !== 'emit' && $this->has_data())
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{
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$state = $this->state;
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$this->$state();
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}
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$this->data = '';
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if ($this->state === 'emit')
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{
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return true;
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}
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$this->version = '';
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$this->encoding = '';
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$this->standalone = '';
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return false;
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}
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/**
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* Check whether there is data beyond the pointer
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*
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* @access private
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* @return bool true if there is further data, false if not
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*/
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public function has_data()
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{
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return (bool) ($this->position < $this->data_length);
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}
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/**
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* Advance past any whitespace
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*
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* @return int Number of whitespace characters passed
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*/
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public function skip_whitespace()
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{
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$whitespace = strspn($this->data, "\x09\x0A\x0D\x20", $this->position);
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$this->position += $whitespace;
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return $whitespace;
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}
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/**
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* Read value
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*/
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public function get_value()
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{
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$quote = substr($this->data, $this->position, 1);
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if ($quote === '"' || $quote === "'")
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{
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$this->position++;
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$len = strcspn($this->data, $quote, $this->position);
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if ($this->has_data())
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{
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$value = substr($this->data, $this->position, $len);
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$this->position += $len + 1;
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return $value;
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}
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}
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return false;
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}
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public function before_version_name()
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{
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if ($this->skip_whitespace())
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{
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$this->state = 'version_name';
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}
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else
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{
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$this->state = false;
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}
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}
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public function version_name()
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{
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if (substr($this->data, $this->position, 7) === 'version')
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{
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$this->position += 7;
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$this->skip_whitespace();
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$this->state = 'version_equals';
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}
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else
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{
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$this->state = false;
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}
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}
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public function version_equals()
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{
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if (substr($this->data, $this->position, 1) === '=')
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{
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$this->position++;
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$this->skip_whitespace();
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$this->state = 'version_value';
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}
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else
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{
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$this->state = false;
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}
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}
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public function version_value()
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{
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if ($this->version = $this->get_value())
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{
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$this->skip_whitespace();
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if ($this->has_data())
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{
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$this->state = 'encoding_name';
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}
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else
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{
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$this->state = 'emit';
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}
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}
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else
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{
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$this->state = false;
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}
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}
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public function encoding_name()
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{
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if (substr($this->data, $this->position, 8) === 'encoding')
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{
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$this->position += 8;
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$this->skip_whitespace();
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$this->state = 'encoding_equals';
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}
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else
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{
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$this->state = 'standalone_name';
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}
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}
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public function encoding_equals()
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{
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if (substr($this->data, $this->position, 1) === '=')
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{
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$this->position++;
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$this->skip_whitespace();
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$this->state = 'encoding_value';
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}
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else
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{
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$this->state = false;
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}
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}
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public function encoding_value()
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{
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if ($this->encoding = $this->get_value())
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{
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$this->skip_whitespace();
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if ($this->has_data())
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{
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$this->state = 'standalone_name';
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}
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else
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{
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$this->state = 'emit';
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}
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}
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else
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{
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$this->state = false;
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}
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}
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public function standalone_name()
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{
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if (substr($this->data, $this->position, 10) === 'standalone')
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{
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$this->position += 10;
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$this->skip_whitespace();
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$this->state = 'standalone_equals';
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}
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else
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{
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$this->state = false;
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}
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}
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public function standalone_equals()
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{
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if (substr($this->data, $this->position, 1) === '=')
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{
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$this->position++;
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$this->skip_whitespace();
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$this->state = 'standalone_value';
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}
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else
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{
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$this->state = false;
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}
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}
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public function standalone_value()
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{
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if ($standalone = $this->get_value())
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{
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switch ($standalone)
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{
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case 'yes':
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$this->standalone = true;
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break;
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case 'no':
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$this->standalone = false;
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break;
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default:
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$this->state = false;
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return;
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}
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$this->skip_whitespace();
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if ($this->has_data())
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{
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$this->state = false;
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}
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else
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{
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$this->state = 'emit';
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}
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}
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else
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{
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$this->state = false;
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}
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}
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}
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