<?php
// a more general XML parser

require_once 'PEAR.php';

class XMLAttribute {
    
    var $name;
    var $value = null;

    function &XMLAttribute($name, $value) {
        $this->name = $name;
        $this->value = $value;
    }
}

class XMLNode {

    var $name;
    var $attributes = array();
    var $content;
    var $children;
    var $parent = null;

    function &XMLNode($name, $attributes) {
        $this->name = $name;
        foreach ($attributes as $name=>$value) {
            $this->attributes[$name] = 
                new XMLAttribute($name, $value);
        }
        $this->children = array();
    }
    function setContent(&$data) {
        $this->content = $data;
    }

    function &addChild(&$child) {
        $child->setParent($this);
        $this->children[] =& $child;
        return $this->children[count($this->children) - 1];    
    }

    function setParent(&$parent) {
        $this->parent =& $parent;
    }
}

class XMLParser {

    var $parser;
    var $root;
    var $last = null;

    function XMLParser() {
        $this->parser = xml_parser_create();
        xml_set_object($this->parser, $this);
        xml_set_element_handler($this->parser, 'start', 'end');
        xml_set_character_data_handler($this->parser, 'cdata');
    }

    function parse($xml) {
        xml_parse($this->parser, $xml);
    }

    function start($parser, $name, $attrs) {
        $tag = trim($name);
        $node = new XMLNode($tag, $attrs);
        if (is_null($this->last)) {
            $this->root =& $node;
        } else {
            $this->last->addChild(&$node);
        }
        $this->last =& $node;
        
    }

    function end($parser, $name) {
        $this->last =& $this->last->parent;
    }

    function cdata($parser, $data) {
        if (!is_null($this->last))
            $this->last->setContent(trim($data));
    }

    function &getRoot() {
        return $this->root;
    }
}

class Transformer {

    var $root;

    function Transformer($root) {
        $this->root = $root;
    }

    function toHTML() {
        return $this->_toTable($this->root);
    }

    function _toTable($node) {
        $out = "<table border='1' cellspacing='0' cellpadding='5' width='100%'>\n".
                "<tr bgcolor='#ffaaaa' align='center'>\n".
                "<th colspan='2' >".$node->name."</th>\n</tr>\n<tr valign='top'>\n".
                "<th bgcolor='#ffccff' width='20%'>Attributes</th>\n".
                "<td bgcolor='#ffffff'>\n";
        if (empty($node->attributes)) {
            $out .= "&nbsp;\n";
        } else {
            foreach ($node->attributes as $attr) {
                $out .= "<b>{$attr->name}</b> = {$attr->value}<br>\n";
            }
        }
        $out .= "</td>\n</tr>\n<tr>\n<th bgcolor='#ffccff' width='20%'>Content:</th>\n".
                "<td bgcolor='#ffffff'>";
        $out .= (trim($node->content)) ? $node->content : '&nbsp;';
        $out .= "</td>\n</tr>\n<tr valign='top'>\n".
                "<th bgcolor='#ffccff' width='20%'>ChildNodes:</th>\n".
                "<td bgcolor='#ffffff'>\n";
        foreach ($node->children as $child) {
            $out .= $this->_toTable($child)."\n";
        }
        $out .= "</td>\n</tr>\n</table>\n";
        return $out;
    }
}


$xml_file = 'presentations/slides/sdphp/data/sdphp_talks.xml';
//$xml_file = '../data/sdphp_talks.xml';
$xmldoc = implode('', file($xml_file));

$parser = new XMLParser();
$parser->parse($xmldoc);
$root = $parser->getRoot();

$transf = new Transformer($root);

echo $transf->toHTML();

?>