cppvalue.cpp 2.29 KB
Newer Older
mueller's avatar
mueller committed
1 2 3 4 5
/******************************************************************************
 *
 * $Id$
 *
 *
dimitri's avatar
dimitri committed
6
 * Copyright (C) 1997-2000 by Dimitri van Heesch.
mueller's avatar
mueller committed
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85
 *
 * 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.
 *
 * All output generated with Doxygen is not covered by this license.
 *
 */

#include <stdlib.h>

#include "cppvalue.h"
#include "constexp.h"

CPPValue parseOctal()
{
  long val = 0;
  for (const char *p = 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 = 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 = 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;
  }
  return CPPValue(val);
}

CPPValue parseCharacter() // does not work for '\n' and the alike 
{
  if (strToken[1]=='\\')
  {
    switch(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':  return parseOctal();
      case 'x': 
      case 'X':  return parseHexadecimal();
      default:   printf("Invalid escape sequence %s found!\n",strToken.data()); 
                 return CPPValue(0L); 
    }
  }
  return CPPValue((long)strToken[1]);
}

CPPValue parseFloat()
{
  return CPPValue(atof(strToken));
}