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        <textarea name='content' rows='20' cols='100'>&lt;?php
/**
 * Atom Syndication Format PHP Library
 *
 * @package AtomLib
 * @link http://code.google.com/p/phpatomlib/
 *
 * @author Elias Torres &lt;elias@torrez.us&gt;
 * @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 = &quot;php://input&quot;;

    var $feed;
    var $current;

	/**
	 * PHP5 constructor.
	 */
    function __construct() {

        $this-&gt;feed = new AtomFeed();
        $this-&gt;current = null;
        $this-&gt;map_attrs_func = array( __CLASS__, 'map_attrs' );
        $this-&gt;map_xmlns_func = array( __CLASS__, 'map_xmlns' );
    }

	/**
	 * PHP4 constructor.
	 */
	public function AtomParser() {
		self::__construct();
	}

	/**
	 * Map attributes to key=&quot;val&quot;
	 *
	 * @param string $k Key
	 * @param string $v Value
	 * @return string
	 */
	public static function map_attrs($k, $v) {
		return &quot;$k=\&quot;$v\&quot;&quot;;
	}

	/**
	 * Map XML namespace to string.
	 *
	 * @param indexish $p XML Namespace element index
	 * @param array $n Two-element array pair. [ 0 =&gt; {namespace}, 1 =&gt; {url} ]
	 * @return string 'xmlns=&quot;{url}&quot;' or 'xmlns:{namespace}=&quot;{url}&quot;'
	 */
	public static function map_xmlns($p, $n) {
		$xd = &quot;xmlns&quot;;
		if( 0 &lt; strlen($n[0]) ) {
			$xd .= &quot;:{$n[0]}&quot;;
		}
		return &quot;{$xd}=\&quot;{$n[1]}\&quot;&quot;;
	}

    function _p($msg) {
        if($this-&gt;debug) {
            print str_repeat(&quot; &quot;, $this-&gt;depth * $this-&gt;indent) . $msg .&quot;\n&quot;;
        }
    }

    function error_handler($log_level, $log_text, $error_file, $error_line) {
        $this-&gt;error = $log_text;
    }

    function parse() {

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

        array_unshift($this-&gt;ns_contexts, array());

        if ( ! function_exists( 'xml_parser_create_ns' ) ) {
        	trigger_error( __( &quot;PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension.&quot; ) );
        	return false;
        }

        $parser = xml_parser_create_ns();
        xml_set_object($parser, $this);
        xml_set_element_handler($parser, &quot;start_element&quot;, &quot;end_element&quot;);
        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($parser, &quot;cdata&quot;);
        xml_set_default_handler($parser, &quot;_default&quot;);
        xml_set_start_namespace_decl_handler($parser, &quot;start_ns&quot;);
        xml_set_end_namespace_decl_handler($parser, &quot;end_ns&quot;);

        $this-&gt;content = '';

        $ret = true;

        $fp = fopen($this-&gt;FILE, &quot;r&quot;);
        while ($data = fread($fp, 4096)) {
            if($this-&gt;debug) $this-&gt;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').&quot;\n&quot;,
                    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(&quot;:&quot;, $name);
        $tag        = array_pop($name_parts);

        switch($name) {
            case $this-&gt;NS . ':feed':
                $this-&gt;current = $this-&gt;feed;
                break;
            case $this-&gt;NS . ':entry':
                $this-&gt;current = new AtomEntry();
                break;
        };

        $this-&gt;_p(&quot;start_element('$name')&quot;);
        #$this-&gt;_p(print_r($this-&gt;ns_contexts,true));
        #$this-&gt;_p('current(' . $this-&gt;current . ')');

        array_unshift($this-&gt;ns_contexts, $this-&gt;ns_decls);

        $this-&gt;depth++;

        if(!empty($this-&gt;in_content)) {

            $this-&gt;content_ns_decls = array();

            if($this-&gt;is_html || $this-&gt;is_text)
                trigger_error(&quot;Invalid content in element found. Content must not be of type text or html if it contains markup.&quot;);

            $attrs_prefix = array();

            // resolve prefixes for attributes
            foreach($attrs as $key =&gt; $value) {
                $with_prefix = $this-&gt;ns_to_prefix($key, true);
                $attrs_prefix[$with_prefix[1]] = $this-&gt;xml_escape($value);
            }

            $attrs_str = join(' ', array_map($this-&gt;map_attrs_func, array_keys($attrs_prefix), array_values($attrs_prefix)));
            if(strlen($attrs_str) &gt; 0) {
                $attrs_str = &quot; &quot; . $attrs_str;
            }

            $with_prefix = $this-&gt;ns_to_prefix($name);

            if(!$this-&gt;is_declared_content_ns($with_prefix[0])) {
                array_push($this-&gt;content_ns_decls, $with_prefix[0]);
            }

            $xmlns_str = '';
            if(count($this-&gt;content_ns_decls) &gt; 0) {
                array_unshift($this-&gt;content_ns_contexts, $this-&gt;content_ns_decls);
                $xmlns_str .= join(' ', array_map($this-&gt;map_xmlns_func, array_keys($this-&gt;content_ns_contexts[0]), array_values($this-&gt;content_ns_contexts[0])));
                if(strlen($xmlns_str) &gt; 0) {
                    $xmlns_str = &quot; &quot; . $xmlns_str;
                }
            }

            array_push($this-&gt;in_content, array($tag, $this-&gt;depth, &quot;&lt;&quot;. $with_prefix[1] .&quot;{$xmlns_str}{$attrs_str}&quot; . &quot;&gt;&quot;));

        } else if(in_array($tag, $this-&gt;ATOM_CONTENT_ELEMENTS) || in_array($tag, $this-&gt;ATOM_SIMPLE_ELEMENTS)) {
            $this-&gt;in_content = array();
            $this-&gt;is_xhtml = $attrs['type'] == 'xhtml';
            $this-&gt;is_html = $attrs['type'] == 'html' || $attrs['type'] == 'text/html';
            $this-&gt;is_text = !in_array('type',array_keys($attrs)) || $attrs['type'] == 'text';
            $type = $this-&gt;is_xhtml ? 'XHTML' : ($this-&gt;is_html ? 'HTML' : ($this-&gt;is_text ? 'TEXT' : $attrs['type']));

            if(in_array('src',array_keys($attrs))) {
                $this-&gt;current-&gt;$tag = $attrs;
            } else {
                array_push($this-&gt;in_content, array($tag,$this-&gt;depth, $type));
            }
        } else if($tag == 'link') {
            array_push($this-&gt;current-&gt;links, $attrs);
        } else if($tag == 'category') {
            array_push($this-&gt;current-&gt;categories, $attrs);
        }

        $this-&gt;ns_decls = array();
    }

    function end_element($parser, $name) {

        $name_parts = explode(&quot;:&quot;, $name);
        $tag        = array_pop($name_parts);

        $ccount = count($this-&gt;in_content);

        # if we are *in* content, then let's proceed to serialize it
        if(!empty($this-&gt;in_content)) {
            # if we are ending the original content element
            # then let's finalize the content
            if($this-&gt;in_content[0][0] == $tag &amp;&amp;
                $this-&gt;in_content[0][1] == $this-&gt;depth) {
                $origtype = $this-&gt;in_content[0][2];
                array_shift($this-&gt;in_content);
                $newcontent = array();
                foreach($this-&gt;in_content as $c) {
                    if(count($c) == 3) {
                        array_push($newcontent, $c[2]);
                    } else {
                        if($this-&gt;is_xhtml || $this-&gt;is_text) {
                            array_push($newcontent, $this-&gt;xml_escape($c));
                        } else {
                            array_push($newcontent, $c);
                        }
                    }
                }
                if(in_array($tag, $this-&gt;ATOM_CONTENT_ELEMENTS)) {
                    $this-&gt;current-&gt;$tag = array($origtype, join('',$newcontent));
                } else {
                    $this-&gt;current-&gt;$tag = join('',$newcontent);
                }
                $this-&gt;in_content = array();
            } else if($this-&gt;in_content[$ccount-1][0] == $tag &amp;&amp;
                $this-&gt;in_content[$ccount-1][1] == $this-&gt;depth) {
                $this-&gt;in_content[$ccount-1][2] = substr($this-&gt;in_content[$ccount-1][2],0,-1) . &quot;/&gt;&quot;;
            } else {
                # else, just finalize the current element's content
                $endtag = $this-&gt;ns_to_prefix($name);
                array_push($this-&gt;in_content, array($tag, $this-&gt;depth, &quot;&lt;/$endtag[1]&gt;&quot;));
            }
        }

        array_shift($this-&gt;ns_contexts);

        $this-&gt;depth--;

        if($name == ($this-&gt;NS . ':entry')) {
            array_push($this-&gt;feed-&gt;entries, $this-&gt;current);
            $this-&gt;current = null;
        }

        $this-&gt;_p(&quot;end_element('$name')&quot;);
    }

    function start_ns($parser, $prefix, $uri) {
        $this-&gt;_p(&quot;starting: &quot; . $prefix . &quot;:&quot; . $uri);
        array_push($this-&gt;ns_decls, array($prefix,$uri));
    }

    function end_ns($parser, $prefix) {
        $this-&gt;_p(&quot;ending: #&quot; . $prefix . &quot;#&quot;);
    }

    function cdata($parser, $data) {
        $this-&gt;_p(&quot;data: #&quot; . str_replace(array(&quot;\n&quot;), array(&quot;\\n&quot;), trim($data)) . &quot;#&quot;);
        if(!empty($this-&gt;in_content)) {
            array_push($this-&gt;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(&quot;:&quot;, $qname);

        # grab the last one (e.g 'div')
        $name = array_pop($components);

        if(!empty($components)) {
            # re-join back the namespace component
            $ns = join(&quot;:&quot;,$components);
            foreach($this-&gt;ns_contexts as $context) {
                foreach($context as $mapping) {
                    if($mapping[1] == $ns &amp;&amp; strlen($mapping[0]) &gt; 0) {
                        return array($mapping, &quot;$mapping[0]:$name&quot;);
                    }
                }
            }
        }

        if($attr) {
            return array(null, $name);
        } else {
            foreach($this-&gt;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-&gt;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('&amp;','&quot;',&quot;'&quot;,'&lt;','&gt;'),
                array('&amp;amp;','&amp;quot;','&amp;apos;','&amp;lt;','&amp;gt;'),
                $content );
    }
}
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