606 lines
19 KiB
PHP
606 lines
19 KiB
PHP
<?php
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/**
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* Project: MagpieRSS: a simple RSS integration tool
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* File: rss_parse.inc - parse an RSS or Atom feed
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* return as a simple object.
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*
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* Handles RSS 0.9x, RSS 2.0, RSS 1.0, and Atom 0.3
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*
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* The lastest version of MagpieRSS can be obtained from:
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* http://magpierss.sourceforge.net
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*
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* For questions, help, comments, discussion, etc., please join the
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* Magpie mailing list:
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* magpierss-general@lists.sourceforge.net
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*
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* @author Kellan Elliott-McCrea <kellan@protest.net>
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* @version 0.7a
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* @license GPL
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*
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*/
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define('RSS', 'RSS');
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define('ATOM', 'Atom');
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require_once (MAGPIE_DIR . 'rss_utils.inc');
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/**
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* Hybrid parser, and object, takes RSS as a string and returns a simple object.
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*
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* see: rss_fetch.inc for a simpler interface with integrated caching support
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*
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*/
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class MagpieRSS {
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var $parser;
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var $current_item = array(); // item currently being parsed
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var $items = array(); // collection of parsed items
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var $channel = array(); // hash of channel fields
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var $textinput = array();
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var $image = array();
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var $feed_type;
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var $feed_version;
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var $encoding = ''; // output encoding of parsed rss
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var $_source_encoding = ''; // only set if we have to parse xml prolog
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var $ERROR = "";
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var $WARNING = "";
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// define some constants
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var $_CONTENT_CONSTRUCTS = array('content', 'summary', 'info', 'title', 'tagline', 'copyright');
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var $_KNOWN_ENCODINGS = array('UTF-8', 'US-ASCII', 'ISO-8859-1');
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// parser variables, useless if you're not a parser, treat as private
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var $stack = array(); // parser stack
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var $inchannel = false;
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var $initem = false;
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var $incontent = false; // if in Atom <content mode="xml"> field
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var $intextinput = false;
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var $inimage = false;
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var $current_namespace = false;
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/**
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* Set up XML parser, parse source, and return populated RSS object..
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*
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* @param string $source string containing the RSS to be parsed
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*
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* NOTE: Probably a good idea to leave the encoding options alone unless
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* you know what you're doing as PHP's character set support is
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* a little weird.
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*
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* NOTE: A lot of this is unnecessary but harmless with PHP5
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*
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*
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* @param string $output_encoding output the parsed RSS in this character
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* set defaults to ISO-8859-1 as this is PHP's
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* default.
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*
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* NOTE: might be changed to UTF-8 in future
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* versions.
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*
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* @param string $input_encoding the character set of the incoming RSS source.
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* Leave blank and Magpie will try to figure it
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* out.
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*
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*
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* @param bool $detect_encoding if false Magpie won't attempt to detect
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* source encoding. (caveat emptor)
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*
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*/
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function MagpieRSS ($source, $output_encoding='UTF-8',
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$input_encoding=null, $detect_encoding=true)
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{
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# if PHP xml isn't compiled in, die
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#
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if (!function_exists('xml_parser_create')) {
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$this->error( "Failed to load PHP's XML Extension. " .
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"http://www.php.net/manual/en/ref.xml.php",
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E_USER_ERROR );
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}
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list($parser, $source) = $this->create_parser($source,
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$output_encoding, $input_encoding, $detect_encoding);
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if (!is_resource($parser)) {
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$this->error( "Failed to create an instance of PHP's XML parser. " .
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"http://www.php.net/manual/en/ref.xml.php",
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E_USER_ERROR );
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}
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$this->parser = $parser;
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# pass in parser, and a reference to this object
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# setup handlers
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#
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xml_set_object( $this->parser, $this );
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xml_set_element_handler($this->parser,
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'feed_start_element', 'feed_end_element' );
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xml_set_character_data_handler( $this->parser, 'feed_cdata' );
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$status = xml_parse( $this->parser, $source );
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if (! $status ) {
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$errorcode = xml_get_error_code( $this->parser );
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if ( $errorcode != XML_ERROR_NONE ) {
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$xml_error = xml_error_string( $errorcode );
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$error_line = xml_get_current_line_number($this->parser);
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$error_col = xml_get_current_column_number($this->parser);
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$errormsg = "$xml_error at line $error_line, column $error_col";
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$this->error( $errormsg );
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}
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}
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xml_parser_free( $this->parser );
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$this->normalize();
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}
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function feed_start_element($p, $element, &$attrs) {
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$el = $element = strtolower($element);
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$attrs = array_change_key_case($attrs, CASE_LOWER);
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// check for a namespace, and split if found
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$ns = false;
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if ( strpos( $element, ':' ) ) {
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list($ns, $el) = split( ':', $element, 2);
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}
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if ( $ns and $ns != 'rdf' ) {
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$this->current_namespace = $ns;
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}
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# if feed type isn't set, then this is first element of feed
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# identify feed from root element
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#
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if (!isset($this->feed_type) ) {
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if ( $el == 'rdf' ) {
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$this->feed_type = RSS;
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$this->feed_version = '1.0';
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}
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elseif ( $el == 'rss' ) {
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$this->feed_type = RSS;
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$this->feed_version = $attrs['version'];
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}
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elseif ( $el == 'feed' ) {
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$this->feed_type = ATOM;
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$this->feed_version = $attrs['version'];
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$this->inchannel = true;
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}
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return;
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}
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if ( $el == 'channel' )
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{
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$this->inchannel = true;
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}
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elseif ($el == 'item' or $el == 'entry' )
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{
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$this->initem = true;
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if ( isset($attrs['rdf:about']) ) {
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$this->current_item['about'] = $attrs['rdf:about'];
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}
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}
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// if we're in the default namespace of an RSS feed,
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// record textinput or image fields
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elseif (
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$this->feed_type == RSS and
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$this->current_namespace == '' and
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$el == 'textinput' )
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{
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$this->intextinput = true;
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}
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elseif (
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$this->feed_type == RSS and
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$this->current_namespace == '' and
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$el == 'image' )
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{
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$this->inimage = true;
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}
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# handle atom content constructs
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elseif ( $this->feed_type == ATOM and in_array($el, $this->_CONTENT_CONSTRUCTS) )
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{
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// avoid clashing w/ RSS mod_content
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if ($el == 'content' ) {
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$el = 'atom_content';
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}
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$this->incontent = $el;
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}
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// if inside an Atom content construct (e.g. content or summary) field treat tags as text
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elseif ($this->feed_type == ATOM and $this->incontent )
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{
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// if tags are inlined, then flatten
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$attrs_str = join(' ',
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array_map('map_attrs',
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array_keys($attrs),
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array_values($attrs) ) );
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$this->append_content( "<$element $attrs_str>" );
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array_unshift( $this->stack, $el );
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}
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// Atom support many links per containging element.
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// Magpie treats link elements of type rel='alternate'
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// as being equivalent to RSS's simple link element.
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//
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elseif ($this->feed_type == ATOM and $el == 'link' )
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{
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if ( isset($attrs['rel']) and $attrs['rel'] == 'alternate' )
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{
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$link_el = 'link';
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}
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else {
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$link_el = 'link_' . $attrs['rel'];
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}
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$this->append($link_el, $attrs['href']);
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}
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// set stack[0] to current element
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else {
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array_unshift($this->stack, $el);
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}
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}
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function feed_cdata ($p, $text) {
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if ($this->feed_type == ATOM and $this->incontent)
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{
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$this->append_content( $text );
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}
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else {
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$current_el = join('_', array_reverse($this->stack));
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$this->append($current_el, $text);
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}
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}
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function feed_end_element ($p, $el) {
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$el = strtolower($el);
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if ( $el == 'item' or $el == 'entry' )
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{
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$this->items[] = $this->current_item;
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$this->current_item = array();
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$this->initem = false;
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}
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elseif ($this->feed_type == RSS and $this->current_namespace == '' and $el == 'textinput' )
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{
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$this->intextinput = false;
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}
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elseif ($this->feed_type == RSS and $this->current_namespace == '' and $el == 'image' )
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{
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$this->inimage = false;
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}
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elseif ($this->feed_type == ATOM and in_array($el, $this->_CONTENT_CONSTRUCTS) )
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{
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$this->incontent = false;
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}
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elseif ($el == 'channel' or $el == 'feed' )
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{
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$this->inchannel = false;
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}
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elseif ($this->feed_type == ATOM and $this->incontent ) {
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// balance tags properly
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// note: i don't think this is actually neccessary
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if ( $this->stack[0] == $el )
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{
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$this->append_content("</$el>");
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}
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else {
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$this->append_content("<$el />");
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}
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array_shift( $this->stack );
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}
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else {
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array_shift( $this->stack );
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}
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$this->current_namespace = false;
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}
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function concat (&$str1, $str2="") {
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if (!isset($str1) ) {
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$str1="";
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}
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$str1 .= $str2;
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}
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function append_content($text) {
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if ( $this->initem ) {
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$this->concat( $this->current_item[ $this->incontent ], $text );
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}
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elseif ( $this->inchannel ) {
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$this->concat( $this->channel[ $this->incontent ], $text );
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}
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}
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// smart append - field and namespace aware
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function append($el, $text) {
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if (!$el) {
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return;
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}
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if ( $this->current_namespace )
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{
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if ( $this->initem ) {
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$this->concat(
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$this->current_item[ $this->current_namespace ][ $el ], $text);
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}
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elseif ($this->inchannel) {
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$this->concat(
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$this->channel[ $this->current_namespace][ $el ], $text );
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}
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elseif ($this->intextinput) {
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$this->concat(
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$this->textinput[ $this->current_namespace][ $el ], $text );
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}
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elseif ($this->inimage) {
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$this->concat(
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$this->image[ $this->current_namespace ][ $el ], $text );
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}
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}
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else {
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if ( $this->initem ) {
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$this->concat(
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$this->current_item[ $el ], $text);
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}
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elseif ($this->intextinput) {
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$this->concat(
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$this->textinput[ $el ], $text );
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}
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elseif ($this->inimage) {
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$this->concat(
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$this->image[ $el ], $text );
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}
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elseif ($this->inchannel) {
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$this->concat(
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$this->channel[ $el ], $text );
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}
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}
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}
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function normalize () {
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// if atom populate rss fields
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if ( $this->is_atom() ) {
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$this->channel['description'] = $this->channel['tagline'];
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for ( $i = 0; $i < count($this->items); $i++) {
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$item = $this->items[$i];
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if ( isset($item['summary']) )
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$item['description'] = $item['summary'];
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if ( isset($item['atom_content']))
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$item['content']['encoded'] = $item['atom_content'];
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$atom_date = (isset($item['issued']) ) ? $item['issued'] : $item['modified'];
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if ( $atom_date ) {
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$epoch = @parse_w3cdtf($atom_date);
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if ($epoch and $epoch > 0) {
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$item['date_timestamp'] = $epoch;
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}
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}
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$this->items[$i] = $item;
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}
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}
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elseif ( $this->is_rss() ) {
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$this->channel['tagline'] = $this->channel['description'];
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for ( $i = 0; $i < count($this->items); $i++) {
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$item = $this->items[$i];
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if ( isset($item['description']))
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$item['summary'] = $item['description'];
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if ( isset($item['content']['encoded'] ) )
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$item['atom_content'] = $item['content']['encoded'];
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if ( $this->is_rss() == '1.0' and isset($item['dc']['date']) ) {
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$epoch = @parse_w3cdtf($item['dc']['date']);
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if ($epoch and $epoch > 0) {
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$item['date_timestamp'] = $epoch;
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}
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}
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elseif ( isset($item['pubdate']) ) {
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$epoch = @strtotime($item['pubdate']);
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if ($epoch > 0) {
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$item['date_timestamp'] = $epoch;
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}
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}
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$this->items[$i] = $item;
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}
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}
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}
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function is_rss () {
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if ( $this->feed_type == RSS ) {
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return $this->feed_version;
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}
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else {
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return false;
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}
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}
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function is_atom() {
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if ( $this->feed_type == ATOM ) {
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return $this->feed_version;
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}
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else {
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return false;
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}
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}
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/**
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* return XML parser, and possibly re-encoded source
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*
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*/
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function create_parser($source, $out_enc, $in_enc, $detect) {
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if ( substr(phpversion(),0,1) == 5) {
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$parser = $this->php5_create_parser($in_enc, $detect);
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}
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else {
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list($parser, $source) = $this->php4_create_parser($source, $in_enc, $detect);
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}
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if ($out_enc) {
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$this->encoding = $out_enc;
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xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, $out_enc);
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}
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return array($parser, $source);
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}
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/**
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* Instantiate an XML parser under PHP5
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*
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* PHP5 will do a fine job of detecting input encoding
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* if passed an empty string as the encoding.
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*
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* All hail libxml2!
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*
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*/
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function php5_create_parser($in_enc, $detect) {
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// by default php5 does a fine job of detecting input encodings
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if(!$detect && $in_enc) {
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return xml_parser_create($in_enc);
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}
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else {
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return xml_parser_create('');
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}
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}
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/**
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* Instaniate an XML parser under PHP4
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*
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* Unfortunately PHP4's support for character encodings
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* and especially XML and character encodings sucks. As
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* long as the documents you parse only contain characters
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* from the ISO-8859-1 character set (a superset of ASCII,
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* and a subset of UTF-8) you're fine. However once you
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* step out of that comfy little world things get mad, bad,
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* and dangerous to know.
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*
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* The following code is based on SJM's work with FoF
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* @see http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
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*
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*/
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function php4_create_parser($source, $in_enc, $detect) {
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if ( !$detect ) {
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return array(xml_parser_create($in_enc), $source);
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}
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if (!$in_enc) {
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if (preg_match('/<?xml.*encoding=[\'"](.*?)[\'"].*?>/m', $source, $m)) {
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$in_enc = strtoupper($m[1]);
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$this->source_encoding = $in_enc;
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}
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else {
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$in_enc = 'UTF-8';
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}
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}
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if ($this->known_encoding($in_enc)) {
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return array(xml_parser_create($in_enc), $source);
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}
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// the dectected encoding is not one of the simple encodings PHP knows
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// attempt to use the iconv extension to
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// cast the XML to a known encoding
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// @see http://php.net/iconv
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if (function_exists('iconv')) {
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$encoded_source = iconv($in_enc,'UTF-8', $source);
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if ($encoded_source) {
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return array(xml_parser_create('UTF-8'), $encoded_source);
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}
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}
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// iconv didn't work, try mb_convert_encoding
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// @see http://php.net/mbstring
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if(function_exists('mb_convert_encoding')) {
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$encoded_source = mb_convert_encoding($source, 'UTF-8', $in_enc );
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if ($encoded_source) {
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return array(xml_parser_create('UTF-8'), $encoded_source);
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}
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}
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// else
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$this->error("Feed is in an unsupported character encoding. ($in_enc) " .
|
|
"You may see strange artifacts, and mangled characters.",
|
|
E_USER_NOTICE);
|
|
|
|
return array(xml_parser_create(), $source);
|
|
}
|
|
|
|
function known_encoding($enc) {
|
|
$enc = strtoupper($enc);
|
|
if ( in_array($enc, $this->_KNOWN_ENCODINGS) ) {
|
|
return $enc;
|
|
}
|
|
else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
function error ($errormsg, $lvl=E_USER_WARNING) {
|
|
// append PHP's error message if track_errors enabled
|
|
if ( isset($php_errormsg) ) {
|
|
$errormsg .= " ($php_errormsg)";
|
|
}
|
|
if ( MAGPIE_DEBUG ) {
|
|
trigger_error( $errormsg, $lvl);
|
|
}
|
|
else {
|
|
error_log( $errormsg, 0);
|
|
}
|
|
|
|
$notices = E_USER_NOTICE|E_NOTICE;
|
|
if ( $lvl&$notices ) {
|
|
$this->WARNING = $errormsg;
|
|
} else {
|
|
$this->ERROR = $errormsg;
|
|
}
|
|
}
|
|
|
|
|
|
} // end class RSS
|
|
|
|
function map_attrs($k, $v) {
|
|
return "$k=\"$v\"";
|
|
}
|
|
|
|
// patch to support medieval versions of PHP4.1.x,
|
|
// courtesy, Ryan Currie, ryan@digibliss.com
|
|
|
|
if (!function_exists('array_change_key_case')) {
|
|
define("CASE_UPPER",1);
|
|
define("CASE_LOWER",0);
|
|
|
|
|
|
function array_change_key_case($array,$case=CASE_LOWER) {
|
|
if ($case=CASE_LOWER) $cmd=strtolower;
|
|
elseif ($case=CASE_UPPER) $cmd=strtoupper;
|
|
foreach($array as $key=>$value) {
|
|
$output[$cmd($key)]=$value;
|
|
}
|
|
return $output;
|
|
}
|
|
|
|
}
|
|
|
|
?>
|