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lisp_reader.cxx Source File
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lisp_reader.cxx

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00001 //  $Id: lisp_reader.cxx,v 1.5 2002/12/28 00:19:53 grumbel Exp $
00002 //
00003 //  Construo - A wire-frame construction game
00004 //  Copyright (C) 2002 Ingo Ruhnke <grumbel@gmx.de>
00005 //
00006 //  This program is free software; you can redistribute it and/or
00007 //  modify it under the terms of the GNU General Public License
00008 //  as published by the Free Software Foundation; either version 2
00009 //  of the License, or (at your option) any later version.
00010 //
00011 //  This program is distributed in the hope that it will be useful,
00012 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 //  GNU General Public License for more details.
00015 //
00016 //  You should have received a copy of the GNU General Public License
00017 //  along with this program; if not, write to the Free Software
00018 //  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00019 
00020 #include "construo_error.hxx"
00021 #include "lisp_reader.hxx"
00022 
00023 LispReader::LispReader (lisp_object_t* l)
00024   : lst (l)
00025 {
00026   //std::cout << "LispReader: " << std::flush;
00027   //lisp_dump(lst, stdout);
00028   //std::cout << std::endl;
00029 }
00030 
00031 lisp_object_t*
00032 LispReader::search_for(const char* name)
00033 {
00034   //std::cout << "LispReader::search_for(" << name << ")" << std::endl;
00035   lisp_object_t* cursor = lst;
00036 
00037   while(!lisp_nil_p(cursor))
00038     {
00039       lisp_object_t* cur = lisp_car(cursor);
00040 
00041       if (!lisp_cons_p(cur) || !lisp_symbol_p (lisp_car(cur)))
00042         {
00043           lisp_dump(cur, stdout);
00044           throw ConstruoError (std::string("LispReader: Read error in search_for ") + name);
00045         }
00046       else
00047         {
00048           if (strcmp(lisp_symbol(lisp_car(cur)), name) == 0)
00049             {
00050               return lisp_cdr(cur);
00051             }
00052         }
00053       
00054       cursor = lisp_cdr (cursor);
00055     }
00056   return 0;
00057 }
00058 
00059 bool
00060 LispReader::read_vector (const char* name, Vector2d* vec)
00061 {
00062   lisp_object_t* obj = search_for (name);
00063   if (obj)
00064     {
00065       vec->x = lisp_real(lisp_car(obj));
00066       vec->y = lisp_real(lisp_car(lisp_cdr(obj)));
00067       return true;
00068     }
00069   return false;
00070 }
00071 
00072 bool
00073 LispReader::read_int (const char* name, int* i)
00074 {
00075   lisp_object_t* obj = search_for (name);
00076   if (obj)
00077     {
00078       *i = lisp_integer(lisp_car(obj));
00079       return true;
00080     }
00081   return false;
00082 }
00083 
00084 bool
00085 LispReader::read_float (const char* name, float* f)
00086 {
00087   lisp_object_t* obj = search_for (name);
00088   if (obj)
00089     {
00090       *f = lisp_real(lisp_car(obj));
00091       return true;
00092     }
00093   return false;
00094 }
00095 
00096 bool
00097 LispReader::read_bool (const char* name, bool* b)
00098 {
00099   lisp_object_t* obj = search_for (name);
00100   if (obj)
00101     {
00102       *b = lisp_boolean(lisp_car(obj));
00103       return true;
00104     }
00105   return false;
00106 }
00107 
00108 /* EOF */

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