<?php

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/**

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* Atom Syndication Format PHP Library

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*

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* @package AtomLib

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* @link http://code.google.com/p/phpatomlib/

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*

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* @author Elias Torres <elias@torrez.us>

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* @version 0.4

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* @since 2.3.0

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*/

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/**

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* Structure that store common Atom Feed Properties

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*

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* @package AtomLib

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*/

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class AtomFeed {

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/**

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* Stores Links

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* @var array

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* @access public

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*/

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var $links = array();

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/**

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* Stores Categories

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* @var array

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* @access public

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*/

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var $categories = array();

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/**

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* Stores Entries

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*

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* @var array

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* @access public

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*/

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var $entries = array();

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}

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/**

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* Structure that store Atom Entry Properties

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*

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* @package AtomLib

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*/

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class AtomEntry {

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/**

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* Stores Links

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* @var array

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* @access public

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*/

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var $links = array();

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/**

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* Stores Categories

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* @var array

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* @access public

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*/

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var $categories = array();

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}

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/**

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* AtomLib Atom Parser API

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*

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* @package AtomLib

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*/

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class AtomParser {

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var $NS = 'http://www.w3.org/2005/Atom';

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var $ATOM_CONTENT_ELEMENTS = array('content','summary','title','subtitle','rights');

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var $ATOM_SIMPLE_ELEMENTS = array('id','updated','published','draft');

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var $debug = false;

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var $depth = 0;

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var $indent = 2;

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var $in_content;

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var $ns_contexts = array();

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var $ns_decls = array();

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var $content_ns_decls = array();

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var $content_ns_contexts = array();

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var $is_xhtml = false;

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var $is_html = false;

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var $is_text = true;

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var $skipped_div = false;

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var $FILE = "php://input";

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var $feed;

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var $current;

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/**

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* PHP5 constructor.

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*/

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function __construct() {

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$this->feed = new AtomFeed();

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$this->current = null;

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$this->map_attrs_func = array( __CLASS__, 'map_attrs' );

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$this->map_xmlns_func = array( __CLASS__, 'map_xmlns' );

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}

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/**

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* PHP4 constructor.

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*/

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public function AtomParser() {

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self::__construct();

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}

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/**

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* Map attributes to key="val"

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*

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* @param string $k Key

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* @param string $v Value

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* @return string

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*/

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public static function map_attrs($k, $v) {

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return "$k=\"$v\"";

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}

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/**

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* Map XML namespace to string.

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*

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* @param indexish $p XML Namespace element index

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* @param array $n Two-element array pair. [ 0 => {namespace}, 1 => {url} ]

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* @return string 'xmlns="{url}"' or 'xmlns:{namespace}="{url}"'

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*/

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public static function map_xmlns($p, $n) {

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$xd = "xmlns";

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if( 0 < strlen($n[0]) ) {

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$xd .= ":{$n[0]}";

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}

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return "{$xd}=\"{$n[1]}\"";

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}

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function _p($msg) {

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if($this->debug) {

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print str_repeat(" ", $this->depth * $this->indent) . $msg ."\n";

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}

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}

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function error_handler($log_level, $log_text, $error_file, $error_line) {

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$this->error = $log_text;

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}

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function parse() {

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set_error_handler(array(&$this, 'error_handler'));

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array_unshift($this->ns_contexts, array());

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if ( ! function_exists( 'xml_parser_create_ns' ) ) {

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trigger_error( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );

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return false;

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}

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$parser = xml_parser_create_ns();

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xml_set_object($parser, $this);

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xml_set_element_handler($parser, "start_element", "end_element");

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xml_parser_set_option($parser,XML_OPTION_CASE_FOLDING,0);

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xml_parser_set_option($parser,XML_OPTION_SKIP_WHITE,0);

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xml_set_character_data_handler($parser, "cdata");

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xml_set_default_handler($parser, "_default");

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xml_set_start_namespace_decl_handler($parser, "start_ns");

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xml_set_end_namespace_decl_handler($parser, "end_ns");

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$this->content = '';

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$ret = true;

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$fp = fopen($this->FILE, "r");

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while ($data = fread($fp, 4096)) {

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if($this->debug) $this->content .= $data;

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if(!xml_parse($parser, $data, feof($fp))) {

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/* translators: 1: Error message, 2: Line number. */

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trigger_error(sprintf(__('XML Error: %1$s at line %2$s')."\n",

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xml_error_string(xml_get_error_code($parser)),

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xml_get_current_line_number($parser)));

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$ret = false;

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break;

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}

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}

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fclose($fp);

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xml_parser_free($parser);

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unset($parser);

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restore_error_handler();

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return $ret;

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}

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function start_element($parser, $name, $attrs) {

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$name_parts = explode(":", $name);

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$tag = array_pop($name_parts);

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switch($name) {

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case $this->NS . ':feed':

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$this->current = $this->feed;

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break;

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case $this->NS . ':entry':

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$this->current = new AtomEntry();

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break;

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};

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$this->_p("start_element('$name')");

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#$this->_p(print_r($this->ns_contexts,true));

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#$this->_p('current(' . $this->current . ')');

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array_unshift($this->ns_contexts, $this->ns_decls);

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$this->depth++;

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if(!empty($this->in_content)) {

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$this->content_ns_decls = array();

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if($this->is_html || $this->is_text)

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trigger_error("Invalid content in element found. Content must not be of type text or html if it contains markup.");

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$attrs_prefix = array();

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// resolve prefixes for attributes

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foreach($attrs as $key => $value) {

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$with_prefix = $this->ns_to_prefix($key, true);

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$attrs_prefix[$with_prefix[1]] = $this->xml_escape($value);

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}

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$attrs_str = join(' ', array_map($this->map_attrs_func, array_keys($attrs_prefix), array_values($attrs_prefix)));

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if(strlen($attrs_str) > 0) {

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$attrs_str = " " . $attrs_str;

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}

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$with_prefix = $this->ns_to_prefix($name);

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if(!$this->is_declared_content_ns($with_prefix[0])) {

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array_push($this->content_ns_decls, $with_prefix[0]);

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}

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$xmlns_str = '';

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if(count($this->content_ns_decls) > 0) {

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array_unshift($this->content_ns_contexts, $this->content_ns_decls);

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$xmlns_str .= join(' ', array_map($this->map_xmlns_func, array_keys($this->content_ns_contexts[0]), array_values($this->content_ns_contexts[0])));

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if(strlen($xmlns_str) > 0) {

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$xmlns_str = " " . $xmlns_str;

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}

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}

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array_push($this->in_content, array($tag, $this->depth, "<". $with_prefix[1] ."{$xmlns_str}{$attrs_str}" . ">"));

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} else if(in_array($tag, $this->ATOM_CONTENT_ELEMENTS) || in_array($tag, $this->ATOM_SIMPLE_ELEMENTS)) {

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$this->in_content = array();

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$this->is_xhtml = $attrs['type'] == 'xhtml';

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$this->is_html = $attrs['type'] == 'html' || $attrs['type'] == 'text/html';

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$this->is_text = !in_array('type',array_keys($attrs)) || $attrs['type'] == 'text';

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$type = $this->is_xhtml ? 'XHTML' : ($this->is_html ? 'HTML' : ($this->is_text ? 'TEXT' : $attrs['type']));

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if(in_array('src',array_keys($attrs))) {

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$this->current->$tag = $attrs;

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} else {

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array_push($this->in_content, array($tag,$this->depth, $type));

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}

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} else if($tag == 'link') {

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array_push($this->current->links, $attrs);

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} else if($tag == 'category') {

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array_push($this->current->categories, $attrs);

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}

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$this->ns_decls = array();

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}

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function end_element($parser, $name) {

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$name_parts = explode(":", $name);

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$tag = array_pop($name_parts);

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$ccount = count($this->in_content);

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# if we are *in* content, then let's proceed to serialize it

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if(!empty($this->in_content)) {

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# if we are ending the original content element

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# then let's finalize the content

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if($this->in_content[0][0] == $tag &&

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$this->in_content[0][1] == $this->depth) {

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$origtype = $this->in_content[0][2];

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array_shift($this->in_content);

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$newcontent = array();

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foreach($this->in_content as $c) {

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if(count($c) == 3) {

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array_push($newcontent, $c[2]);

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} else {

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if($this->is_xhtml || $this->is_text) {

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array_push($newcontent, $this->xml_escape($c));

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} else {

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array_push($newcontent, $c);

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}

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}

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}

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if(in_array($tag, $this->ATOM_CONTENT_ELEMENTS)) {

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$this->current->$tag = array($origtype, join('',$newcontent));

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} else {

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$this->current->$tag = join('',$newcontent);

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}

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$this->in_content = array();

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} else if($this->in_content[$ccount-1][0] == $tag &&

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$this->in_content[$ccount-1][1] == $this->depth) {

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$this->in_content[$ccount-1][2] = substr($this->in_content[$ccount-1][2],0,-1) . "/>";

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} else {

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# else, just finalize the current element's content

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$endtag = $this->ns_to_prefix($name);

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array_push($this->in_content, array($tag, $this->depth, "</$endtag[1]>"));

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}

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}

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array_shift($this->ns_contexts);

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$this->depth--;

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if($name == ($this->NS . ':entry')) {

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array_push($this->feed->entries, $this->current);

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$this->current = null;

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}

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$this->_p("end_element('$name')");

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}

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function start_ns($parser, $prefix, $uri) {

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$this->_p("starting: " . $prefix . ":" . $uri);

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array_push($this->ns_decls, array($prefix,$uri));

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}

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function end_ns($parser, $prefix) {

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$this->_p("ending: #" . $prefix . "#");

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}

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function cdata($parser, $data) {

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$this->_p("data: #" . str_replace(array("\n"), array("\\n"), trim($data)) . "#");

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if(!empty($this->in_content)) {

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array_push($this->in_content, $data);

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}

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}

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function _default($parser, $data) {

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# when does this gets called?

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}

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function ns_to_prefix($qname, $attr=false) {

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# split 'http://www.w3.org/1999/xhtml:div' into ('http','//www.w3.org/1999/xhtml','div')

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$components = explode(":", $qname);

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# grab the last one (e.g 'div')

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$name = array_pop($components);

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if(!empty($components)) {

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# re-join back the namespace component

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$ns = join(":",$components);

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foreach($this->ns_contexts as $context) {

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foreach($context as $mapping) {

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if($mapping[1] == $ns && strlen($mapping[0]) > 0) {

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return array($mapping, "$mapping[0]:$name");

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}

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}

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}

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}

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if($attr) {

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return array(null, $name);

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} else {

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foreach($this->ns_contexts as $context) {

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foreach($context as $mapping) {

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if(strlen($mapping[0]) == 0) {

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return array($mapping, $name);

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}

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}

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}

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}

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}

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function is_declared_content_ns($new_mapping) {

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foreach($this->content_ns_contexts as $context) {

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foreach($context as $mapping) {

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if($new_mapping == $mapping) {

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return true;

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}

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}

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}

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return false;

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}

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function xml_escape($string)

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{

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return str_replace(array('&','"',"'",'<','>'),

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array('&amp;','&quot;','&apos;','&lt;','&gt;'),

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$string );

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}

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}

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