demos/life/reader.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        reader.cpp
   3 // Purpose:     Life! pattern reader (writer coming soon)
   4 // Author:      Guillermo Rodriguez Garcia, <guille@iies.es>
   5 // Modified by:
   6 // Created:     Jan/2000
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000, Guillermo Rodriguez Garcia
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ==========================================================================
  13 // headers, declarations, constants
  14 // ==========================================================================
  15
  16 // For compilers that support precompilation, includes "wx/wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20     #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/wx.h"
  25 #endif
  26
  27 #include "wx/txtstrm.h"
  28 #include "reader.h"
  29
  30
  31 // ==========================================================================
  32 // LifeReader
  33 // ==========================================================================
  34
  35 #define LIFE_CHECKVAL( msg )                                        \
  36     if (!m_ok)                                                      \
  37     {                                                               \
  38         wxMessageBox( msg, _("Error"), wxICON_EXCLAMATION | wxOK ); \
  39         return;                                                     \
  40     }
  41
  42 LifeReader::LifeReader(wxInputStream& is)
  43 {
  44     wxBufferedInputStream buff_is(is);
  45     wxTextInputStream     text_is(buff_is);
  46     wxString              line, rest;
  47
  48     // check stream
  49     m_ok = is.IsOk();
  50     LIFE_CHECKVAL(_("Couldn't read any data"));
  51
  52     // read signature
  53     m_ok = text_is.ReadLine().Contains(wxT("#Life 1.05"));
  54     LIFE_CHECKVAL(_("Error reading signature. Not a Life pattern?"));
  55
  56     // read description
  57     m_description = wxEmptyString;
  58     line = text_is.ReadLine();
  59     while (buff_is.IsOk() && line.StartsWith(wxT("#D"), &rest))
  60     {
  61         m_description += rest.Trim(false);
  62         m_description += wxT("\n");
  63         line = text_is.ReadLine();
  64     }
  65
  66     m_ok = buff_is.IsOk();
  67     LIFE_CHECKVAL(_("Unexpected EOF while reading description"));
  68
  69     // read rules
  70     m_ok = line.StartsWith(wxT("#N"));
  71     LIFE_CHECKVAL(_("Sorry, non-conway rules not supported yet"));
  72
  73     // read shape
  74     while (buff_is.IsOk())
  75     {
  76         line = ( text_is.ReadLine() ).Trim();
  77
  78         if (!line.empty())
  79         {
  80             if (line.StartsWith(wxT("#P "), &rest))
  81                 m_shape.Add(rest);
  82             else
  83                 m_shape.Add(line);
  84         }
  85     }
  86 }
  87