libxslt._pike

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/* Copyright (C) 2000-2004  Thomas Bopp, Thorsten Hampel, Ludger Merkens
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 * $Id: libxslt.pike,v 1.3 2009/05/18 20:25:24 astra Exp $
 */
inherit "/kernel/module";
#include <macros.h>
#include <database.h>
//! This is the libxslt module - the run() function is used to
//! transform given xml code with a xsl stylesheet.
//! sleece was here!
class libxslt : public module{
public:






private  object parser = xslt.Parser();
private  Thread.Mutex xsltMutex = Thread.Mutex();


/**
 * callback function to find a stylesheet.
 *  
 * @param string uri - the uri to locate the stylesheet
 * @return the stylesheet content or zero.
 */
protected:
 int match_stylesheet(string uri)
{
    if ( search(uri, "steam:") == 0 )
   return 1;
    return 0;
}

public:

protected:
 object open_stylesheet(string uri)
{
    sscanf(uri, "steam:/%s", uri);
    return _FILEPATH->path_to_object(uri);
}

public:

protected:
 string|int
read_stylesheet(object obj, string language, int position)
{
    if ( objectp(obj) ) {
   LOG("Stylesheet content found !");
   string contstr = obj->get_content(language);
   LOG("length="+strlen(contstr) + " of " + obj->get_object_id());
   return contstr;
    }
    LOG("No Stylesheet given for reading");
    return 0;
}

public:

protected:
 void
close_stylesheet(object obj)
{
}

public:

/**
 * Run the conversion and return the html code or whatever.
 *  
 * @param string xml - the xml code.
 * @param string|object xsl - the xsl stylesheet for transformation.
 * @param mapping vars - the variables passed to the stylesheet as params.
 * @return the transformed xml code.
 */
string run(string xml, object|string xsl, mapping params)
{
    string    html;
    mapping vars = copy_value(params);

    if ( !stringp(xml) || strlen(xml) == 0 )
   steam_error("Failed to transform xml - xml is empty.");
    
    if ( !objectp(xsl) )
      MESSAGE("No Stylesheet param !");

    object lock = xsltMutex->lock();
    mixed err = catch {
   mapping cfgs = _Server->get_configs();
   foreach ( indices(cfgs), string cfg) {
     if(stringp(cfg))
       {
         if ( intp(cfgs[cfg]) ) 
           cfgs[cfg] = sprintf("%d", cfgs[cfg]);
         else if ( !stringp(cfgs[cfg]) )
           continue;
         vars[replace(cfg, ":", "_")] = (string)cfgs[cfg];
         m_delete(cfgs, cfg);
       }
   }
   foreach( indices(vars), string index) {
     if ( (stringp(vars[index]) && search(vars[index], "\0") >= 0 ) ||
          !stringp(vars[index]) && !intp(vars[index]) )
       vars[index] = 0;
     else if ( intp(vars[index]) )
       vars[index] = (string)vars[index];
     else {
       vars[index] = replace(vars[index], 
                             ({ "ä", "ö", "ü", "Ä", "Ö", "Ü", "ß", "\""}),
                             ({ "%e4", "%f6", "%fc", "%c4", "%d6", "%dc",
                                "%df", "\\\"" }));
     }
   }
   
   parser->set_variables(vars);
   
   object stylesheet;
   if ( !stringp(vars["language"]) ) {
     //werror("No language defined - setting english !\n");
     vars["language"] = "english";
   }
   if ( objectp(xsl) ) {
     string lang = vars["language"];
     stylesheet = xsl->get_stylesheet(lang);
   }
   else if ( stringp(xsl) ) {
     stylesheet = xslt.Stylesheet();
     
     stylesheet->set_language(vars["language"]);
     stylesheet->set_include_callbacks(match_stylesheet,
                                       open_stylesheet,
                                       read_stylesheet,
                                       close_stylesheet);
     stylesheet->set_content(xsl);
   }
   else 
     error("xslt: Invalid run argument for XSL-Stylesheet !");
   
   parser->set_xml_data(xml);
   html = parser->run(stylesheet);
      };
    destruct(lock);
    if ( arrayp(err) || objectp(err) ) {
   FATAL("Error while processing xml !\n"+PRINT_BT(err));
   
   THROW("LibXSLT (version="+parser->get_version()+
         ") xsl: Error while processing xsl ("
              +(objectp(xsl)?xsl->get_identifier()+" #"+xsl->get_object_id():
           "no stylesheet")+" ):\n" + 
         err[0] + "\n", E_ERROR);
    }
    else if ( err )
      FATAL("Error running xslt: %O", err);
    return html;
}

string get_identifier() { return "libxslt"; }
string get_version() { return parser->get_version(); }



};