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