root / drupal7 / sites / all / libraries / simplepie / library / SimplePie / XML / Declaration / Parser.php @ 41cc1b08
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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) 2004-2012, Ryan Parman, Geoffrey 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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* @version 1.3.1
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* @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
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* @author Ryan Parman
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* @author Geoffrey 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 ($this->state === 'emit') |
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{
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return true; |
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} |
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else
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{
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$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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/**
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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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} |