--- /dev/null
+<?php
+/*
+ * atomlib.php - Atom Syndication Format PHP Library
+ *
+ * Project: http://code.google.com/p/phpatomlib/
+ *
+ * Author: Elias Torres <elias@torrez.us>
+ * Version: 0.4
+ *
+ */
+
+class AtomFeed {
+ var $links = array();
+ var $categories = array();
+
+ var $entries = array();
+}
+
+class AtomEntry {
+ var $links = array();
+ var $categories = array();
+}
+
+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;
+
+ function AtomParser() {
+
+ $this->feed = new AtomFeed();
+ $this->current = null;
+ $this->map_attrs_func = create_function('$k,$v', 'return "$k=\"$v\"";');
+ $this->map_xmlns_func = create_function('$p,$n', '$xd = "xmlns"; if(strlen($n[0])>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());
+
+ $parser = xml_parser_create_ns();
+ xml_set_object($parser, $this);
+ xml_set_element_handler($parser, "start_element", "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($parser, "cdata");
+ xml_set_default_handler($parser, "_default");
+ xml_set_start_namespace_decl_handler($parser, "start_ns");
+ xml_set_end_namespace_decl_handler($parser, "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))) {
+ trigger_error(sprintf(__('XML error: %s at line %d')."\n",
+ xml_error_string(xml_get_error_code($xml_parser)),
+ xml_get_current_line_number($xml_parser)));
+ $ret = false;
+ break;
+ }
+ }
+ fclose($fp);
+
+ xml_parser_free($parser);
+
+ restore_error_handler();
+
+ return $ret;
+ }
+
+ function start_element($parser, $name, $attrs) {
+
+ $tag = array_pop(split(":", $name));
+
+ switch($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) {
+
+ $tag = array_pop(split(":", $name));
+
+ $ccount = count($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 = split(":", $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 == $mapping) {
+ return true;
+ }
+ }
+ }
+ return false;
+ }
+
+ function xml_escape($string)
+ {
+ return str_replace(array('&','"',"'",'<','>'),
+ array('&','"',''','<','>'),
+ $string );
+ }
+}
+
+?>
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