<?php
if(!defined("METAL_LIBRARY_XML_RSS_WRITER_CLASS"))
{
    define("METAL_LIBRARY_XML_RSS_WRITER_CLASS",1);

/*
 *
 * Copyright � (C) Manuel Lemos 2002
 *
 * @(#) $Id: rss_writer_class.php,v 1.5 2005/08/20 09:46:06 pachanga Exp $
 *
 */

class rss_writer_class extends xml_writer_class
{
    /*
     * Protected variables
     *
     */
    var $root="";
    var $channel="";
    var $image="";
    var $textinput="";
    var $items=0;
    var $itemsequence="";

    /*
     * Public variables
     *
     */
    var $specification="1.0";
    var $about="";
    var $rssnamespaces=array();
    var $allownoitems=0;
    var $generatedcomment="Generated by: http://www.phpclasses.org/rsswriter";


    /*
     * Protected functions
     *
     */
    Function addrssproperties(&$properties,$parent,&$required,&$optional,$scope)
    {
        $noattributes=array();
        $required_properties=0;
        Reset($properties);
        $end=(GetType($property=Key($properties))!="string");
        for(;!$end;)
        {
            if(IsSet($required[$property]))
            {
                if($required[$property])
                {
                    $this->error=("required ".$scope." property \"".$property."\" is already set");
                    return 0;
                }
                $required[$property]=1;
                $required_properties++;
            }
            else
            {
                if(IsSet($optional[$property]))
                {
                    if($optional[$property])
                    {
                        $this->error=("optional ".$scope." property \"".$property."\" is already set");
                        return 0;
                    }
                    $optional[$property]=1;
                }
                else
                {
                    if(GetType($colon=strpos($property,":",0))=="integer")
                    {
                        $namespace=substr($property,0,$colon);
                        if(!(!strcmp($namespace,"rdf") || IsSet($this->rssnamespaces[$namespace])))
                            $this->error=("the name space of property \"".$property."\" was not declared");
                    }
                    else
                        $this->error=("\"".$property."\" is not a supported ".$scope." property");
                }
            }
            if(!($this->adddatatag($property,$noattributes,$properties[$property],$parent,$path)))
                return 0;
            Next($properties);
            $end=(GetType($property=Key($properties))!="string");
        }
        if($required_properties<count($required))
        {
            Reset($required);
            $end=(GetType($property=Key($required))!="string");
            for(;!$end;)
            {
                if(!($required[$property]))
                {
                    $this->error=("it was not specified the required ".$scope." property \"".$property."\"");
                    return 0;
                }
                Next($required);
                $end=(GetType($property=Key($required))!="string");
            }
        }
        return 1;
    }

    /*
     * Public functions
     *
     */
    Function addchannel(&$properties)
    {
        if(strcmp($this->error,""))
            return 0;
        if(strcmp($this->channel,""))
        {
            $this->error="a channel was already added";
            return 0;
        }
        $channel_attributes=array();
        switch($this->specification)
        {
            case "0.9":
                $root="rdf:RDF";
                $attributes=array("xmlns:rdf"=>"http://www.w3.org/1999/02/22-rdf-syntax-ns#","xmlns"=>"http://my.netscape.com/rdf/simple/0.9/");
                $required=array("description"=>0,"link"=>0,"title"=>0);
                $optional=array();
                break;
            case "0.91":
                $root="rss";
                $attributes=array("version"=>$this->specification);
                $required=array("description"=>0,"language"=>0,"link"=>0,"title"=>0);
                $optional=array("copyright"=>0,"docs"=>0,"lastBuildDate"=>0,"managingEditor"=>0,"pubDate"=>0,"rating"=>0,"webMaster"=>0);
                break;
            case "1.0":
                if(!strcmp($this->about,""))
                {
                    $this->error="it was not specified the about URL attribute";
                    return 0;
                }
                $root="rdf:RDF";
                $attributes=array("xmlns:rdf"=>"http://www.w3.org/1999/02/22-rdf-syntax-ns#","xmlns"=>"http://purl.org/rss/1.0/");
                Reset($this->rssnamespaces);
                $end=(GetType($namespace=Key($this->rssnamespaces))!="string");
                for(;!$end;)
                {
                    if(!strcmp($namespace,"rdf"))
                    {
                        $this->error="the rdf namespace is being redeclared";
                        return 0;
                    }
                    $attributes[("xmlns:".$namespace)]=$this->rssnamespaces[$namespace];
                    Next($this->rssnamespaces);
                    $end=(GetType($namespace=Key($this->rssnamespaces))!="string");
                }
                $channel_attributes=array("rdf:about"=>$this->about);
                $required=array("description"=>0,"link"=>0,"title"=>0);
                $optional=array();
                break;
            default:
                $this->error="it was not specified a supported RSS specification version";
                return 0;
        }
        $this->addtag($root,$attributes,"",$path,1);
        $this->root=$path;
        if(!($this->addtag("channel",$channel_attributes,$this->root,$path,1)))
            return 0;
        if(!($this->addrssproperties($properties,$path,$required,$optional,"channel")))
            return 0;
        $this->channel=$path;
        return 1;
    }

    Function additem(&$properties)
    {
        if(strcmp($this->error,""))
            return 0;
        if(!strcmp($this->channel,""))
        {
            $this->error="the channel was not yet added";
            return 0;
        }
        if(strcmp($this->textinput,""))
        {
            $this->error="items can not be added to the channel after defining the textinput";
            return 0;
        }
        $attributes=array();
        switch($this->specification)
        {
            case "0.9":
                $parent=$this->root;
                break;
            case "0.91":
                $parent=$this->channel;
                break;
            case "1.0":
                if(IsSet($properties["link"]))
                    $attributes["rdf:about"]=$properties["link"];
                $parent=$this->root;
                break;
            default:
                $this->error="it was not specified a supported RSS specification version";
                return 0;
        }
        if(!($this->addtag("item",$attributes,$parent,$path,1)))
            return 0;
        $required=array("link"=>0,"title"=>0);
        $optional=array("description"=>0);
        if(!($this->addrssproperties($properties,$path,$required,$optional,"item")))
            return 0;
        if(!strcmp($this->specification,"1.0"))
        {
            if(!strcmp($this->itemsequence,""))
            {
                $attributes=array();
                if(!($this->addtag("items",$attributes,$this->channel,$path,1) && $this->addtag("rdf:Seq",$attributes,$path,$path,1)))
                    return 0;
                $this->itemsequence=$path;
            }
            $attributes=array("rdf:resource"=>$properties["link"]);
            if(!($this->addtag("rdf:li",$attributes,$this->itemsequence,$path,0)))
                return 0;
        }
        $this->items++;
        return 1;
    }

    Function addimage(&$properties)
    {
        if(strcmp($this->error,""))
            return 0;
        if(!strcmp($this->channel,""))
        {
            $this->error="the channel was not yet added";
            return 0;
        }
        if(strcmp($this->image,""))
        {
            $this->error="the channel image was already associated";
            return 0;
        }
        if($this->items!=0)
        {
            $this->error="the image can only be defined before adding the channel items";
            return 0;
        }
        $attributes=array();
        switch($this->specification)
        {
            case "0.9":
                $parent=$this->root;
                break;
            case "0.91":
                $parent=$this->channel;
                break;
            case "1.0":
                if(IsSet($properties["url"]))
                    $attributes["rdf:about"]=$properties["url"];
                $parent=$this->root;
                break;
            default:
                $this->error="it was not specified a supported RSS specification version";
                return 0;
        }
        if(!($this->addtag("image",$attributes,$parent,$path,1)))
            return 0;
        $this->image=$path;
        $required=array("link"=>0,"title"=>0,"url"=>0);
        $optional=array("description"=>0,"width"=>0,"height"=>0);
        if(!($this->addrssproperties($properties,$this->image,$required,$optional,"image")))
            return 0;
        if(!strcmp($this->specification,"1.0"))
        {
            $attributes=array("rdf:resource"=>$properties["url"]);
            return $this->addtag("image",$attributes,$this->channel,$path,0);
        }
        return 1;
    }

    Function addtextinput(&$properties)
    {
        if(strcmp($this->error,""))
            return 0;
        if(!strcmp($this->channel,""))
        {
            $this->error="the channel was not yet added";
            return 0;
        }
        if(strcmp($this->textinput,""))
        {
            $this->error="the channel text input was already associated";
            return 0;
        }
        if($this->items==0 && !$this->allownoitems)
        {
            $this->error="it were not specified any items before defining the channel text input";
            return 0;
        }
        $attributes=array();
        switch($this->specification)
        {
            case "0.9":
                $parent=$this->root;
                break;
            case "0.91":
                $parent=$this->channel;
                break;
            case "1.0":
                if(IsSet($properties["link"]))
                    $attributes["rdf:about"]=$properties["link"];
                $parent=$this->root;
                break;
            default:
                $this->error="it was not specified a supported RSS specification version";
                return 0;
        }
        if(!($this->addtag("textinput",$attributes,$parent,$path,1)))
            return 0;
        $this->textinput=$path;
        $required=array("description"=>0,"link"=>0,"name"=>0,"title"=>0);
        $optional=array();
        if(!($this->addrssproperties($properties,$this->textinput,$required,$optional,"textinput")))
            return 0;
        if(!strcmp($this->specification,"1.0"))
        {
            $attributes=array("rdf:resource"=>$properties["link"]);
            return $this->addtag("textinput",$attributes,$this->channel,$path,0);
        }
        return 1;
    }

    Function writerss(&$output)
    {
        if(strcmp($this->error,""))
            return 0;
        if(!strcmp($this->channel,""))
        {
            $this->error="it was not defined the RSS channel";
            return 0;
        }
        if($this->items==0 && !$this->allownoitems)
        {
            $this->error="it were not defined any RSS channel items";
            return 0;
        }
        switch($this->specification)
        {
            case "0.9":
                $this->dtdtype="PUBLIC";
                $this->dtddefinition="-//Netscape Communications//DTD RSS 0.9//EN";
                $this->dtdurl="http://my.netscape.com/publish/formats/rss-0.9.dtd";
                break;
            case "0.91":
                $this->dtdtype="PUBLIC";
                $this->dtddefinition="-//Netscape Communications//DTD RSS 0.91//EN";
                $this->dtdurl="http://my.netscape.com/publish/formats/rss-0.91.dtd";
                break;
            case "1.0":
                $this->dtdtype="";
                break;
            default:
                $this->error="it was not specified a supported RSS specification version";
                return 0;
        }
        return $this->write($output);
    }
};

}