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Edit File: atomlib.php
<?php /** * Atom Syndication Format PHP Library * * @package AtomLib * @link http://code.google.com/p/phpatomlib/ * * @author Elias Torres <elias@torrez.us> * @version 0.4 * @since 2.3.0 */ /** * Structure that store common Atom Feed Properties * * @package AtomLib */ class AtomFeed { /** * Stores Links * @var array * @access public */ var $links = array(); /** * Stores Categories * @var array * @access public */ var $categories = array(); /** * Stores Entries * * @var array * @access public */ var $entries = array(); } /** * Structure that store Atom Entry Properties * * @package AtomLib */ class AtomEntry { /** * Stores Links * @var array * @access public */ var $links = array(); /** * Stores Categories * @var array * @access public */ var $categories = array(); } /** * AtomLib Atom Parser API * * @package AtomLib */ class AtomParser { var $NS = 'http://www.w3.org/2005/Atom'; var $ATOM_CONTENT_ELEMENTS = array('content','summary','title','subtitle','rights'); var $ATOM_SIMPLE_ELEMENTS = array('id','updated','published','draft'); var $debug = false; var $depth = 0; var $indent = 2; var $in_content; var $ns_contexts = array(); var $ns_decls = array(); var $content_ns_decls = array(); var $content_ns_contexts = array(); var $is_xhtml = false; var $is_html = false; var $is_text = true; var $skipped_div = false; var $FILE = "php://input"; var $feed; var $current; var $map_attrs_func; var $map_xmlns_func; var $error; var $content; /** * PHP5 constructor. */ function __construct() { $this->feed = new AtomFeed(); $this->current = null; $this->map_attrs_func = array( __CLASS__, 'map_attrs' ); $this->map_xmlns_func = array( __CLASS__, 'map_xmlns' ); } /** * PHP4 constructor. */ public function AtomParser() { self::__construct(); } /** * Map attributes to key="val" * * @param string $k Key * @param string $v Value * @return string */ public static function map_attrs($k, $v) { return "$k=\"$v\""; } /** * Map XML namespace to string. * * @param indexish $p XML Namespace element index * @param array $n Two-element array pair. [ 0 => {namespace}, 1 => {url} ] * @return string 'xmlns="{url}"' or 'xmlns:{namespace}="{url}"' */ public static function map_xmlns($p, $n) { $xd = "xmlns"; if( 0 < strlen($n[0]) ) { $xd .= ":{$n[0]}"; } return "{$xd}=\"{$n[1]}\""; } function _p($msg) { if($this->debug) { print str_repeat(" ", $this->depth * $this->indent) . $msg ."\n"; } } function error_handler($log_level, $log_text, $error_file, $error_line) { $this->error = $log_text; } function parse() { set_error_handler(array(&$this, 'error_handler')); array_unshift($this->ns_contexts, array()); if ( ! function_exists( 'xml_parser_create_ns' ) ) { trigger_error( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) ); return false; } $parser = xml_parser_create_ns(); xml_set_element_handler($parser, array($this, "start_element"), array($this, "end_element")); xml_parser_set_option($parser,XML_OPTION_CASE_FOLDING,0); xml_parser_set_option($parser,XML_OPTION_SKIP_WHITE,0); xml_set_character_data_handler($parser, array($this, "cdata")); xml_set_default_handler($parser, array($this, "_default")); xml_set_start_namespace_decl_handler($parser, array($this, "start_ns")); xml_set_end_namespace_decl_handler($parser, array($this, "end_ns")); $this->content = ''; $ret = true; $fp = fopen($this->FILE, "r"); while ($data = fread($fp, 4096)) { if($this->debug) $this->content .= $data; if(!xml_parse($parser, $data, feof($fp))) { /* translators: 1: Error message, 2: Line number. */ trigger_error(sprintf(__('XML Error: %1$s at line %2$s')."\n", xml_error_string(xml_get_error_code($parser)), xml_get_current_line_number($parser))); $ret = false; break; } } fclose($fp); xml_parser_free($parser); unset($parser); restore_error_handler(); return $ret; } function start_element($parser, $name, $attrs) { $name_parts = explode(":", $name); $tag = array_pop($name_parts); switch($name) { case $this->NS . ':feed': $this->current = $this->feed; break; case $this->NS . ':entry': $this->current = new AtomEntry(); break; }; $this->_p("start_element('$name')"); #$this->_p(print_r($this->ns_contexts,true)); #$this->_p('current(' . $this->current . ')'); array_unshift($this->ns_contexts, $this->ns_decls); $this->depth++; if(!empty($this->in_content)) { $this->content_ns_decls = array(); if($this->is_html || $this->is_text) trigger_error("Invalid content in element found. Content must not be of type text or html if it contains markup."); $attrs_prefix = array(); // resolve prefixes for attributes foreach($attrs as $key => $value) { $with_prefix = $this->ns_to_prefix($key, true); $attrs_prefix[$with_prefix[1]] = $this->xml_escape($value); } $attrs_str = join(' ', array_map($this->map_attrs_func, array_keys($attrs_prefix), array_values($attrs_prefix))); if(strlen($attrs_str) > 0) { $attrs_str = " " . $attrs_str; } $with_prefix = $this->ns_to_prefix($name); if(!$this->is_declared_content_ns($with_prefix[0])) { array_push($this->content_ns_decls, $with_prefix[0]); } $xmlns_str = ''; if(count($this->content_ns_decls) > 0) { array_unshift($this->content_ns_contexts, $this->content_ns_decls); $xmlns_str .= join(' ', array_map($this->map_xmlns_func, array_keys($this->content_ns_contexts[0]), array_values($this->content_ns_contexts[0]))); if(strlen($xmlns_str) > 0) { $xmlns_str = " " . $xmlns_str; } } array_push($this->in_content, array($tag, $this->depth, "<". $with_prefix[1] ."{$xmlns_str}{$attrs_str}" . ">")); } else if(in_array($tag, $this->ATOM_CONTENT_ELEMENTS) || in_array($tag, $this->ATOM_SIMPLE_ELEMENTS)) { $this->in_content = array(); $this->is_xhtml = $attrs['type'] == 'xhtml'; $this->is_html = $attrs['type'] == 'html' || $attrs['type'] == 'text/html'; $this->is_text = !in_array('type',array_keys($attrs)) || $attrs['type'] == 'text'; $type = $this->is_xhtml ? 'XHTML' : ($this->is_html ? 'HTML' : ($this->is_text ? 'TEXT' : $attrs['type'])); if(in_array('src',array_keys($attrs))) { $this->current->$tag = $attrs; } else { array_push($this->in_content, array($tag,$this->depth, $type)); } } else if($tag == 'link') { array_push($this->current->links, $attrs); } else if($tag == 'category') { array_push($this->current->categories, $attrs); } $this->ns_decls = array(); } function end_element($parser, $name) { $name_parts = explode(":", $name); $tag = array_pop($name_parts); $ccount = count($this->in_content); # if we are *in* content, then let's proceed to serialize it if(!empty($this->in_content)) { # if we are ending the original content element # then let's finalize the content if($this->in_content[0][0] == $tag && $this->in_content[0][1] == $this->depth) { $origtype = $this->in_content[0][2]; array_shift($this->in_content); $newcontent = array(); foreach($this->in_content as $c) { if(count($c) == 3) { array_push($newcontent, $c[2]); } else { if($this->is_xhtml || $this->is_text) { array_push($newcontent, $this->xml_escape($c)); } else { array_push($newcontent, $c); } } } if(in_array($tag, $this->ATOM_CONTENT_ELEMENTS)) { $this->current->$tag = array($origtype, join('',$newcontent)); } else { $this->current->$tag = join('',$newcontent); } $this->in_content = array(); } else if($this->in_content[$ccount-1][0] == $tag && $this->in_content[$ccount-1][1] == $this->depth) { $this->in_content[$ccount-1][2] = substr($this->in_content[$ccount-1][2],0,-1) . "/>"; } else { # else, just finalize the current element's content $endtag = $this->ns_to_prefix($name); array_push($this->in_content, array($tag, $this->depth, "</$endtag[1]>")); } } array_shift($this->ns_contexts); $this->depth--; if($name == ($this->NS . ':entry')) { array_push($this->feed->entries, $this->current); $this->current = null; } $this->_p("end_element('$name')"); } function start_ns($parser, $prefix, $uri) { $this->_p("starting: " . $prefix . ":" . $uri); array_push($this->ns_decls, array($prefix,$uri)); } function end_ns($parser, $prefix) { $this->_p("ending: #" . $prefix . "#"); } function cdata($parser, $data) { $this->_p("data: #" . str_replace(array("\n"), array("\\n"), trim($data)) . "#"); if(!empty($this->in_content)) { array_push($this->in_content, $data); } } function _default($parser, $data) { # when does this gets called? } function ns_to_prefix($qname, $attr=false) { # split 'http://www.w3.org/1999/xhtml:div' into ('http','//www.w3.org/1999/xhtml','div') $components = explode(":", $qname); # grab the last one (e.g 'div') $name = array_pop($components); if(!empty($components)) { # re-join back the namespace component $ns = join(":",$components); foreach($this->ns_contexts as $context) { foreach($context as $mapping) { if($mapping[1] == $ns && strlen($mapping[0]) > 0) { return array($mapping, "$mapping[0]:$name"); } } } } if($attr) { return array(null, $name); } else { foreach($this->ns_contexts as $context) { foreach($context as $mapping) { if(strlen($mapping[0]) == 0) { return array($mapping, $name); } } } } } function is_declared_content_ns($new_mapping) { foreach($this->content_ns_contexts as $context) { foreach($context as $mapping) { if($new_mapping == $mapping) { return true; } } } return false; } function xml_escape($content) { return str_replace(array('&','"',"'",'<','>'), array('&','"',''','<','>'), $content ); } }