/**************************************************************************
 * 
 * Copyright 2009 VMware, Inc.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 **************************************************************************/

#include <stdlib.h>
#include "sl_pp_process.h"


int
sl_pp_process_line(struct sl_pp_context *context,
                   const struct sl_pp_token_info *input,
                   unsigned int first,
                   unsigned int last)
{
   unsigned int i;
   struct sl_pp_process_state state;
   int line_number = -1;
   int file_number = -1;

   memset(&state, 0, sizeof(state));
   for (i = first; i < last;) {
      switch (input[i].token) {
      case SL_PP_WHITESPACE:
         i++;
         break;

      case SL_PP_IDENTIFIER:
         if (sl_pp_macro_expand(context, input, &i, NULL, &state, 0)) {
            free(state.out);
            return -1;
         }
         break;

      default:
         if (sl_pp_process_out(&state, &input[i])) {
            free(state.out);
            return -1;
         }
         i++;
      }
   }

   if (state.out_len > 0 && state.out[0].token == SL_PP_NUMBER) {
      line_number = state.out[0].data.number;
   } else {
      strcpy(context->error_msg, "expected number after `#line'");
      free(state.out);
      return -1;
   }

   if (state.out_len > 1) {
      if (state.out[1].token == SL_PP_NUMBER) {
         file_number = state.out[1].data.number;
      } else {
         strcpy(context->error_msg, "expected number after line number");
         free(state.out);
         return -1;
      }

      if (state.out_len > 2) {
         strcpy(context->error_msg, "expected end of line after file number");
         free(state.out);
         return -1;
      }
   }

   free(state.out);

   /* TODO: Do something with line and file numbers. */

   return 0;
}