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 #ifdef __GNUG__
  17     #pragma implementation "reader.h"
  18 #endif
  19
  20 // For compilers that support precompilation, includes "wx/wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/wx.h"
  29 #endif
  30
  31 #include "wx/txtstrm.h"
  32 #include "reader.h"
  33
  34
  35 // ==========================================================================
  36 // LifeReader
  37 // ==========================================================================
  38
  39 #define LIFE_CHECKVAL( msg )                                        \
  40     if (!m_ok)                                                      \
  41     {                                                               \
  42         wxMessageBox( msg, _("Error"), wxICON_EXCLAMATION | wxOK ); \
  43         return;                                                     \
  44     }
  45
  46 LifeReader::LifeReader(wxInputStream& is)
  47 {
  48     wxBufferedInputStream buff_is(is);
  49     wxTextInputStream     text_is(buff_is);
  50     wxString              line, rest;
  51
  52     // check stream
  53     m_ok = is.IsOk();
  54     LIFE_CHECKVAL(_("Couldn't read any data"));
  55
  56     // read signature
  57     m_ok = text_is.ReadLine().Contains(wxT("#Life 1.05"));
  58     LIFE_CHECKVAL(_("Error reading signature. Not a Life pattern?"));
  59
  60     // read description
  61     m_description = wxEmptyString;
  62     line = text_is.ReadLine();
  63     while (buff_is.IsOk() && line.StartsWith(wxT("#D"), &rest))
  64     {
  65         m_description += rest.Trim(false);
  66         m_description += wxT("\n");
  67         line = text_is.ReadLine();
  68     }
  69
  70     m_ok = buff_is.IsOk();
  71     LIFE_CHECKVAL(_("Unexpected EOF while reading description"));
  72
  73     // read rules
  74     m_ok = line.StartsWith(wxT("#N"));
  75     LIFE_CHECKVAL(_("Sorry, non-conway rules not supported yet"));
  76
  77     // read shape
  78     while (buff_is.IsOk())
  79     {
  80         line = ( text_is.ReadLine() ).Trim();
  81
  82         if (!line.empty())
  83         {
  84             if (line.StartsWith(wxT("#P "), &rest))
  85                 m_shape.Add(rest);
  86             else
  87                 m_shape.Add(line);
  88         }
  89     }
  90 }
  91