lex_token.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 __TINYLEXTOKEN_H
#define __TINYLEXTOKEN_H

#include <stdio.h>
#include <string.h>

#include "lex_util.h"

namespace TinyXPath
{

class lex_token 
{
   char * cp_value;
   lexico l_enum;
   lex_token * ltp_next, * ltp_prev;
public :
   lex_token (lexico l_in_enum, const _byte_ * bp_in_value, unsigned u_in_size)
   {
      l_enum = l_in_enum;
      cp_value = new char [u_in_size + 1];
      if (u_in_size)
         memcpy (cp_value, bp_in_value, u_in_size);
      cp_value [u_in_size] = 0;
      ltp_next = NULL;
      ltp_prev = NULL;
   }
   void v_set_next (lex_token * ltp_in_next)
   {
      ltp_next = ltp_in_next;
   }
   void v_set_prev (lex_token * ltp_in_prev)
   {
      ltp_prev = ltp_in_prev;
   }
   ~ lex_token ()
   {
      if (cp_value)
         delete [] cp_value;
   }

   lex_token * ltp_get_next () const
   {
      return ltp_next;
   }

   lex_token * ltp_get_prev () const
   {
      return ltp_prev;
   }

   lex_token * ltp_get_next (int i_nb)
   {
      lex_token * ltp_ret;
      int i;

      ltp_ret = this;
      for (i = 0; i < i_nb; i++)
      {
         if (! ltp_ret)
            return NULL;
         ltp_ret = ltp_ret -> ltp_get_next ();
         if (! ltp_ret || ! ltp_ret -> o_is_valid ())
            return NULL;
      }
      return ltp_ret;
   }

   lexico lex_get_value () const
   {
      return l_enum;
   }

   void v_set (lexico lex_in, const char * cp_repre)
   {
      unsigned u_length;

      l_enum = lex_in;
      delete [] cp_value;
      u_length = strlen (cp_repre);
      cp_value = new char [u_length + 1];
      strcpy (cp_value, cp_repre);
   }

   const char * cp_get_literal ()
   {
      return cp_value;
   }

   bool o_is_valid () const {return (l_enum != lex_null);}
} ;

}

#endif

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