HTML Examples/WP.iso/wordpress/wp-includes/SimplePie/XML/Declaration/Parser.php

PHP Script | 2012-11-21 | 7.0 KB | 363 lines

<?php
/**
 * SimplePie
 *
 * A PHP-Based RSS and Atom Feed Framework.
 * Takes the hard work out of managing a complete RSS/Atom solution.
 *
 * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above copyright notice, this list
 *       of conditions and the following disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 *     * Neither the name of the SimplePie Team nor the names of its contributors may be used
 *       to endorse or promote products derived from this software without specific prior
 *       written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @package SimplePie
 * @version 1.3.1
 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
 * @author Ryan Parman
 * @author Geoffrey Sneddon
 * @author Ryan McCue
 * @link http://simplepie.org/ SimplePie
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 */


/**
 * Parses the XML Declaration
 *
 * @package SimplePie
 * @subpackage Parsing
 */
class SimplePie_XML_Declaration_Parser
{
    /**
     * XML Version
     *
     * @access public
     * @var string
     */
    var $version = '1.0';

    /**
     * Encoding
     *
     * @access public
     * @var string
     */
    var $encoding = 'UTF-8';

    /**
     * Standalone
     *
     * @access public
     * @var bool
     */
    var $standalone = false;

    /**
     * Current state of the state machine
     *
     * @access private
     * @var string
     */
    var $state = 'before_version_name';

    /**
     * Input data
     *
     * @access private
     * @var string
     */
    var $data = '';

    /**
     * Input data length (to avoid calling strlen() everytime this is needed)
     *
     * @access private
     * @var int
     */
    var $data_length = 0;

    /**
     * Current position of the pointer
     *
     * @var int
     * @access private
     */
    var $position = 0;

    /**
     * Create an instance of the class with the input data
     *
     * @access public
     * @param string $data Input data
     */
    public function __construct($data)
    {
        $this->data = $data;
        $this->data_length = strlen($this->data);
    }

    /**
     * Parse the input data
     *
     * @access public
     * @return bool true on success, false on failure
     */
    public function parse()
    {
        while ($this->state && $this->state !== 'emit' && $this->has_data())
        {
            $state = $this->state;
            $this->$state();
        }
        $this->data = '';
        if ($this->state === 'emit')
        {
            return true;
        }
        else
        {
            $this->version = '';
            $this->encoding = '';
            $this->standalone = '';
            return false;
        }
    }

    /**
     * Check whether there is data beyond the pointer
     *
     * @access private
     * @return bool true if there is further data, false if not
     */
    public function has_data()
    {
        return (bool) ($this->position < $this->data_length);
    }

    /**
     * Advance past any whitespace
     *
     * @return int Number of whitespace characters passed
     */
    public function skip_whitespace()
    {
        $whitespace = strspn($this->data, "\x09\x0A\x0D\x20", $this->position);
        $this->position += $whitespace;
        return $whitespace;
    }

    /**
     * Read value
     */
    public function get_value()
    {
        $quote = substr($this->data, $this->position, 1);
        if ($quote === '"' || $quote === "'")
        {
            $this->position++;
            $len = strcspn($this->data, $quote, $this->position);
            if ($this->has_data())
            {
                $value = substr($this->data, $this->position, $len);
                $this->position += $len + 1;
                return $value;
            }
        }
        return false;
    }

    public function before_version_name()
    {
        if ($this->skip_whitespace())
        {
            $this->state = 'version_name';
        }
        else
        {
            $this->state = false;
        }
    }

    public function version_name()
    {
        if (substr($this->data, $this->position, 7) === 'version')
        {
            $this->position += 7;
            $this->skip_whitespace();
            $this->state = 'version_equals';
        }
        else
        {
            $this->state = false;
        }
    }

    public function version_equals()
    {
        if (substr($this->data, $this->position, 1) === '=')
        {
            $this->position++;
            $this->skip_whitespace();
            $this->state = 'version_value';
        }
        else
        {
            $this->state = false;
        }
    }

    public function version_value()
    {
        if ($this->version = $this->get_value())
        {
            $this->skip_whitespace();
            if ($this->has_data())
            {
                $this->state = 'encoding_name';
            }
            else
            {
                $this->state = 'emit';
            }
        }
        else
        {
            $this->state = false;
        }
    }

    public function encoding_name()
    {
        if (substr($this->data, $this->position, 8) === 'encoding')
        {
            $this->position += 8;
            $this->skip_whitespace();
            $this->state = 'encoding_equals';
        }
        else
        {
            $this->state = 'standalone_name';
        }
    }

    public function encoding_equals()
    {
        if (substr($this->data, $this->position, 1) === '=')
        {
            $this->position++;
            $this->skip_whitespace();
            $this->state = 'encoding_value';
        }
        else
        {
            $this->state = false;
        }
    }

    public function encoding_value()
    {
        if ($this->encoding = $this->get_value())
        {
            $this->skip_whitespace();
            if ($this->has_data())
            {
                $this->state = 'standalone_name';
            }
            else
            {
                $this->state = 'emit';
            }
        }
        else
        {
            $this->state = false;
        }
    }

    public function standalone_name()
    {
        if (substr($this->data, $this->position, 10) === 'standalone')
        {
            $this->position += 10;
            $this->skip_whitespace();
            $this->state = 'standalone_equals';
        }
        else
        {
            $this->state = false;
        }
    }

    public function standalone_equals()
    {
        if (substr($this->data, $this->position, 1) === '=')
        {
            $this->position++;
            $this->skip_whitespace();
            $this->state = 'standalone_value';
        }
        else
        {
            $this->state = false;
        }
    }

    public function standalone_value()
    {
        if ($standalone = $this->get_value())
        {
            switch ($standalone)
            {
                case 'yes':
                    $this->standalone = true;
                    break;

                case 'no':
                    $this->standalone = false;
                    break;

                default:
                    $this->state = false;
                    return;
            }

            $this->skip_whitespace();
            if ($this->has_data())
            {
                $this->state = false;
            }
            else
            {
                $this->state = 'emit';
            }
        }
        else
        {
            $this->state = false;
        }
    }
}