/******************************************************************************

 *

 * 

 *

 *

 * Copyright (C) 1997-2015 by Dimitri van Heesch.

 *

 * Permission to use, copy, modify, and distribute this software and its

 * documentation under the terms of the GNU General Public License is hereby 

 * granted. No representations are made about the suitability of this software 

 * for any purpose. It is provided "as is" without express or implied warranty.

 * See the GNU General Public License for more details.

 *

 * Documents produced by Doxygen are derivative works derived from the

 * input used in their production; they are not affected by this license.

 *

 */

#include <stdlib.h>

#include "cppvalue.h"

#include "constexp.h"

CPPValue parseOctal()

{

  long val = 0;

  for (const char *p = g_strToken.data(); *p != 0; p++)

  {

    if (*p >= '0' && *p <= '7') val = val * 8 + *p - '0';

  }

  return CPPValue(val);

}

CPPValue parseDecimal()

{

  long val = 0;

  for (const char *p = g_strToken.data(); *p != 0; p++)

  {

    if (*p >= '0' && *p <= '9') val = val * 10 + *p - '0';

  }

  return CPPValue(val);

}

CPPValue parseHexadecimal()

{

  long val = 0;

  for (const char *p = g_strToken.data(); *p != 0; p++)

  {

    if      (*p >= '0' && *p <= '9') val = val * 16 + *p - '0';

    else if (*p >= 'a' && *p <= 'f') val = val * 16 + *p - 'a' + 10;

    else if (*p >= 'A' && *p <= 'F') val = val * 16 + *p - 'A' + 10;

  }

  //printf("parseHexadecimal %s->%x\n",g_strToken.data(),val);

  return CPPValue(val);

}

CPPValue parseCharacter() // does not work for '\n' and the alike 

{

  if (g_strToken[1]=='\\')

  {

    switch(g_strToken[2])

    {

      case 'n':  return CPPValue((long)'\n');

      case 't':  return CPPValue((long)'\t');

      case 'v':  return CPPValue((long)'\v');

      case 'b':  return CPPValue((long)'\b');

      case 'r':  return CPPValue((long)'\r');

      case 'f':  return CPPValue((long)'\f');

      case 'a':  return CPPValue((long)'\a');

      case '\\': return CPPValue((long)'\\');

      case '?':  return CPPValue((long)'\?');

      case '\'': return CPPValue((long)'\'');

      case '"':  return CPPValue((long)'"');

      case '0':  // fall through

      case '1':  // fall through

      case '2':  // fall through

      case '3':  // fall through

      case '4':  // fall through

      case '5':  // fall through

      case '6':  // fall through

      case '7':  // fall through

                 return parseOctal();

      case 'x': 

      case 'X':  return parseHexadecimal();

      default:   printf("Invalid escape sequence %s found!\n",g_strToken.data()); 

                 return CPPValue(0L); 

    }

  }

  return CPPValue((long)g_strToken[1]);

}

CPPValue parseFloat()

{

  return CPPValue(atof(g_strToken));

}