xpath_expression.h

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/*
www.sourceforge.net/projects/tinyxpath
Copyright (c) 2002-2004 Yves Berquin (yvesb@users.sourceforge.net)

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this software.

Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must
not claim that you wrote the original software. If you use this
software in a product, an acknowledgment in the product documentation
would be appreciated but is not required.

2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original software.

3. This notice may not be removed or altered from any source
distribution.
*/

#ifndef __EXPR_H
#define __EXPR_H

#include "tinyxpath_conf.h"
#include "tinyxml.h"
#include "node_set.h"

namespace TinyXPath
{

typedef enum {e_bool, e_string, e_int, e_double, e_node_set, e_invalid} e_expression_type;

class expression_result
{
protected : 
    TIXML_STRING S_content;
   #ifdef TINYXPATH_DEBUG

       TIXML_STRING S_comment;
   #endif

    bool o_content;
    int i_content;
    double d_content;
   node_set ns_set;

public :
    e_expression_type e_type;
    expression_result ()
    {
        e_type = e_invalid;
      o_content = false;
      i_content = 0;
      d_content = 0.0;
    }
    expression_result (const expression_result & er_2)
    {
      * this = er_2;
    }

   expression_result & operator = (const expression_result & er_2)
   {
        e_type = er_2 . e_type;
      switch (e_type)
      {
         case e_bool :
            o_content = er_2 . o_content;
            break;
         case e_int :
            i_content = er_2 . i_content;
            break;
         case e_string :
            S_content = er_2 . S_content;
            break;
         case e_double :
            d_content = er_2 . d_content;
            break;
         case e_node_set :
            ns_set = er_2 . ns_set;
            break;
      }
      #ifdef TINYXPATH_DEBUG
         S_comment = er_2 . S_comment;
      #endif
      return * this;
   }
    void v_set_bool (bool o_in)
    {
        e_type = e_bool;
        o_content = o_in;
    }
    void v_set_int (int i_in)
    {
        e_type = e_int;
        i_content = i_in;
    }
    void v_set_string (const char * cp_in)
    {
        e_type = e_string;
        S_content = cp_in;
    }
    void v_set_string (TIXML_STRING S_in)
    {
        e_type = e_string;
        S_content = S_in;
    }
    void v_set_double (double d_in)
    {
        e_type = e_double;
        d_content = d_in;
    }
    void v_set_comment (const char * cp_in)
    {
      #ifdef TINYXPATH_DEBUG
           S_comment = cp_in;
      #endif
    }
    int i_get_int ();
    TIXML_STRING S_get_string ();
    const char * cp_get_string ()
    {
        assert (e_type == e_string);
        return S_content . c_str ();
    }   
    bool o_get_bool ();
    double d_get_double ();
    void v_set_node_set (node_set * nsp_source)
    {
        e_type = e_node_set;
      ns_set = * nsp_source;
    }
    void v_set_node_set (TiXmlNode * XNp_root)
    {
        e_type = e_node_set;
      ns_set . v_copy_node_children (XNp_root);
    }
    void v_set_node_set (TiXmlNode * XNp_root, const char * cp_lookup)
    {
        e_type = e_node_set;
      ns_set . v_copy_node_children (XNp_root, cp_lookup);
    }
    void v_set_node_set_recursive (TiXmlNode * XNp_root)
    {
        e_type = e_node_set;
      ns_set . v_copy_selected_node_recursive (XNp_root);
    }
    void v_set_node_set_recursive (TiXmlNode * XNp_root, const char * cp_lookup)
    {
        e_type = e_node_set;
      ns_set . v_copy_selected_node_recursive (XNp_root, cp_lookup);
    }
    void v_set_node_set ()
   {
      e_type = e_node_set;
   }
   node_set * nsp_get_node_set ()
   {
      return & ns_set;
   }
   #ifdef TINYXPATH_DEBUG
      void v_dump ();
   #endif
} ;

}

#endif

---