RiosState.cpp

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// $Id: RiosState.cpp 1186 2019-07-12 17:49:59Z mueller $
// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright 2006-2018 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
// 
// Revision History: 
// Date         Rev Version  Comment
// 2018-12-21  1090   1.0.1  use constructor delegation
// 2011-01-30   357   1.0    Adopted from CTBioState
// 2006-04-16     -   -      Last change on CTBioState
// ---------------------------------------------------------------------------
 
#include "RiosState.hpp"
 
using namespace std;
 
//------------------------------------------+-----------------------------------
// all method definitions in namespace Retro
namespace Retro {
 
 
RiosState::RiosState(ios& stream)
  : fStream(stream),
    fOldFlags(fStream.flags()),
    fOldPrecision(-1),
    fOldFill(0),
    fCtype(0)
{}
 
//------------------------------------------+-----------------------------------
 
RiosState::RiosState(ios& stream, const char* form, int prec)
  : RiosState(stream)
{
  SetFormat(form, prec);
}
 
//------------------------------------------+-----------------------------------
 
RiosState::~RiosState()
{
  fStream.flags(fOldFlags);
  if (fOldPrecision >= 0) fStream.precision(fOldPrecision);
  if (fOldFill      != 0) fStream.fill(fOldFill);
}
 
//------------------------------------------+-----------------------------------
 
void RiosState::SetFormat(const char* form, int prec)
{
  bool    b_plus      = false;
  bool    b_minus     = false;
  bool    b_point     = false;
  bool    b_dollar    = false;
  bool    b_internal  = false;
  char    c_ctype     = 0;
  char    c_fill      = 0;
  char    c;
 
  if (form == nullptr) form = "";           // allow null as format
 
  for (c = *form++; ; c = *form++) {
    if (c == '+') { b_plus   = true; continue;}
    if (c == '-') { b_minus  = true; continue;}
    if (c == '.') { b_point  = true; continue;}
    if (c == '$') { b_dollar = true; continue;}
    break;
  }
 
  if (c != 0 && isalpha(c)) { c_ctype = c; c = *form++; }
  if (c != 0) c_fill = c;
 
  if (prec >= 0) {
    int i_old_precision = fStream.precision(prec);
    if (fOldPrecision < 0) fOldPrecision = i_old_precision;
  }
  if (c_fill != 0) {
    char c_old_fill = fStream.fill(c_fill);
    if (fOldFill == 0) fOldFill = c_old_fill;
  }
 
  fCtype = c_ctype;
 
  switch(c_ctype) {
    case 'd':
        b_internal = !b_minus & (c_fill == '0');
        fStream.setf(ios::dec,ios::basefield);
        break;
    case 'o':
        b_internal = !b_minus & (c_fill == '0');
        fStream.setf(ios::oct,ios::basefield);
        break;
    case 'x':
    case 'X':
        b_internal = !b_minus & (c_fill == '0');
        fStream.setf(ios::hex,ios::basefield);
        if (isupper(c_ctype)) fStream.setf(ios::uppercase);
        break;
    case 'g':
    case 'G':
        b_internal = !b_minus & (c_fill == '0');
        fStream.setf(ios_base::fmtflags(0),ios::floatfield);
        if (isupper(c_ctype)) fStream.setf(ios::uppercase);
        break;
    case 'f':
        b_internal = !b_minus & (c_fill == '0');
        fStream.setf(ios::fixed,ios::floatfield);
        break;
    case 'e':
    case 'E':
        b_internal = !b_minus & (c_fill == '0');
        fStream.setf(ios::scientific,ios::floatfield);
        if (isupper(c_ctype)) fStream.setf(ios::uppercase);
        break;
    case 's':
    case 'p':
    case 'c':
        break;
  }
 
  {
    ios_base::fmtflags l_flags = ios_base::fmtflags(0);
    if (b_plus)   l_flags |= ios::showpos;
    if (b_point)  l_flags |= ios::showpoint;
    if (b_dollar) l_flags |= ios::showbase;
    fStream.setf(l_flags);
    fStream.setf(b_internal ? ios::internal : 
                   (b_minus ? ios::left : ios::right), ios::adjustfield);
  }
}
 
} // end namespace Retro