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<?php

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// +----------------------------------------------------------------------+

// | PHP Version 4                                                        |

// +----------------------------------------------------------------------+

// | Copyright (c) 1997-2003 The PHP Group                                |

// +----------------------------------------------------------------------+

// | This source file is subject to version 2.02 of the PHP license,      |

// | that is bundled with this package in the file LICENSE, and is        |

// | available at through the world-wide-web at                           |

// | http://www.php.net/license/2_02.txt.                                 |

// | If you did not receive a copy of the PHP license and are unable to   |

// | obtain it through the world-wide-web, please send a note to          |

// | license@php.net so we can mail you a copy immediately.               |

// +----------------------------------------------------------------------+

// | Authors: Martin Jansen <mj@php.net>                                  |

// |                                                                      |

// +----------------------------------------------------------------------+

//

// $Id: RSS.php,v 1.1 2005-04-18 16:13:31 jpm Exp $

//

require_once 'XML/Parser.php';

/**

* RSS parser class.

*

* This class is a parser for Resource Description Framework (RDF) Site

* Summary (RSS) documents. For more information on RSS see the

* website of the RSS working group (http://www.purl.org/rss/).

*

* @author Martin Jansen <mj@php.net>

* @version $Revision: 1.1 $

* @access  public

*/

class XML_RSS extends XML_Parser

{

    // {{{ properties

    /**

     * @var string

     */

    var $insideTag = '';

    /**

     * @var string

     */

    var $activeTag = '';

    /**

     * @var array

     */

    var $channel = array();

    /**

     * @var array

     */

    var $items = array();

    /**

     * @var array

     */

    var $item = array();

    /**

     * @var array

     */

    var $image = array();

    /**

     * @var array

     */

    var $textinput = array();

    /**

     * @var array

     */

    var $textinputs = array();

    /**

     * @var array

     */

    var $parentTags = array('CHANNEL', 'ITEM', 'IMAGE', 'TEXTINPUT');

    /**

     * @var array

     */

    var $channelTags = array('TITLE', 'LINK', 'DESCRIPTION', 'IMAGE',

                              'ITEMS', 'TEXTINPUT');

    /**

     * @var array

     */

    var $itemTags = array('TITLE', 'LINK', 'DESCRIPTION', 'PUBDATE');

    /**

     * @var array

     */

    var $imageTags = array('TITLE', 'URL', 'LINK');

    var $textinputTags = array('TITLE', 'DESCRIPTION', 'NAME', 'LINK');

    /**

     * List of allowed module tags

     *

     * Currently Dublin Core Metadata and the blogChannel RSS module

     * are supported.

     *

     * @var array

     */

    var $moduleTags = array('DC:TITLE', 'DC:CREATOR', 'DC:SUBJECT', 'DC:DESCRIPTION',

                            'DC:PUBLISHER', 'DC:CONTRIBUTOR', 'DC:DATE', 'DC:TYPE',

                            'DC:FORMAT', 'DC:IDENTIFIER', 'DC:SOURCE', 'DC:LANGUAGE',

                            'DC:RELATION', 'DC:COVERAGE', 'DC:RIGHTS',

                            'BLOGCHANNEL:BLOGROLL', 'BLOGCHANNEL:MYSUBSCRIPTIONS',

                            'BLOGCHANNEL:MYSUBSCRIPTIONS', 'BLOGCHANNEL:CHANGES');

    // }}}

    // {{{ Constructor

    /**

     * Constructor

     *

     * @access public

     * @param mixed File pointer or name of the RDF file.

     * @return void

     */

    function XML_RSS($handle = '')

    {

        $this->XML_Parser();

        if (@is_resource($handle)) {

            $this->setInput($handle);

        } elseif ($handle != '') {

            $this->setInputFile($handle);

        } else {

            $this->raiseError('No filename passed.');

        }

    }

    // }}}

    // {{{ startHandler()

    /**

     * Start element handler for XML parser

     *

     * @access private

     * @param  object XML parser object

     * @param  string XML element

     * @param  array  Attributes of XML tag

     * @return void

     */

    function startHandler($parser, $element, $attribs)

    {

        switch ($element) {

            case 'CHANNEL':

            case 'ITEM':

            case 'IMAGE':

            case 'TEXTINPUT':

                $this->insideTag = $element;

                break;

            default:

                $this->activeTag = $element;

        }

    }

    // }}}

    // {{{ endHandler()

    /**

     * End element handler for XML parser

     *

     * If the end of <item>, <channel>, <image> or <textinput>

     * is reached, this function updates the structure array

     * $this->struct[] and adds the field "type" to this array,

     * that defines the type of the current field.

     *

     * @access private

     * @param  object XML parser object

     * @param  string

     * @return void

     */

    function endHandler($parser, $element)

    {

        if ($element == $this->insideTag) {

            $this->insideTag = '';

            $this->struct[] = array_merge(array('type' => strtolower($element)),

                                          $this->last);

        }

        if ($element == 'ITEM') {

            $this->items[] = $this->item;

            $this->item = '';

        }

        if ($element == 'IMAGE') {

            $this->images[] = $this->image;

            $this->image = '';

        }

        if ($element == 'TEXTINPUT') {

            $this->textinputs = $this->textinput;

            $this->textinput = '';

        }

        $this->activeTag = '';

    }

    // }}}

    // {{{ cdataHandler()

    /**

     * Handler for character data

     *

     * @access private

     * @param  object XML parser object

     * @param  string CDATA

     * @return void

     */

    function cdataHandler($parser, $cdata)

    {

        if (in_array($this->insideTag, $this->parentTags)) {

            $tagName = strtolower($this->insideTag);

            $var = $this->{$tagName . 'Tags'};

            if (in_array($this->activeTag, $var) ||

                in_array($this->activeTag, $this->moduleTags)) {

                $this->_add($tagName, strtolower($this->activeTag),

                            $cdata);

            }

        }

    }

    // }}}

    // {{{ defaultHandler()

    /**

     * Default handler for XML parser

     *

     * @access private

     * @param  object XML parser object

     * @param  string CDATA

     * @return void

     */

    function defaultHandler($parser, $cdata)

    {

        return;

    }

    // }}}

    // {{{ _add()

    /**

     * Add element to internal result sets

     *

     * @access private

     * @param  string Name of the result set

     * @param  string Fieldname

     * @param  string Value

     * @return void

     * @see    cdataHandler

     */

    function _add($type, $field, $value)

    {

        if (empty($this->{$type}) || empty($this->{$type}[$field])) {

            $this->{$type}[$field] = $value;

        } else {

            $this->{$type}[$field] .= $value;

        }

        $this->last = $this->{$type};

    }

    // }}}

    // {{{ getStructure()

    /**

     * Get complete structure of RSS file

     *

     * @access public

     * @return array

     */

    function getStructure()

    {

        return (array)$this->struct;

    }

    // }}}

    // {{{ getchannelInfo()

    /**

     * Get general information about current channel

     *

     * This function returns an array containing the information

     * that has been extracted from the <channel>-tag while parsing

     * the RSS file.

     *

     * @access public

     * @return array

     */

    function getChannelInfo()

    {

        return (array)$this->channel;

    }

    // }}}

    // {{{ getItems()

    /**

     * Get items from RSS file

     *

     * This function returns an array containing the set of items

     * that are provided by the RSS file.

     *

     * @access public

     * @return array

     */

    function getItems()

    {

        return (array)$this->items;

    }

    // }}}

    // {{{ getImages()

    /**

     * Get images from RSS file

     *

     * This function returns an array containing the set of images

     * that are provided by the RSS file.

     *

     * @access public

     * @return array

     */

    function getImages()

    {

        return (array)$this->images;

    }

    // }}}

    // {{{ getTextinputs()

    /**

     * Get text input fields from RSS file

     *

     * @access public

     * @return array

     */

    function getTextinputs()

    {

        return (array)$this->textinputs;

    }

    // }}}

}

?>