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<?php

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/**

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* SimplePie

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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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* 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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* * 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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* * 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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* * 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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* 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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* @package SimplePie

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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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* Parses the XML Declaration

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* @package SimplePie

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* @subpackage Parsing

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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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* @access public

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* @var string

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var $version = '1.0';

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/**

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* Encoding

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* @access public

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* @var string

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var $encoding = 'UTF-8';

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/**

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* Standalone

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* @access public

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* @var bool

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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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* @access private

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* @var string

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var $state = 'before_version_name';

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/**

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* Input data

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* @access private

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* @var string

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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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* @access private

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* @var int

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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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* @var int

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* @access private

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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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* @access public

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* @param string $data Input data

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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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* @access public

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* @return bool true on success, false on failure

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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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* @access private

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* @return bool true if there is further data, false if not

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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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* @return int Number of whitespace characters passed

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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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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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