mes/src/module.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
SCM struct_ref_ (SCM x, long i);
SCM struct_set_x_ (SCM x, long i, SCM e);
SCM cstring_to_symbol (char const *s);
SCM
make_module_type () ///(internal))
{
SCM record_type = cell_symbol_record_type; // FIXME
SCM fields = cell_nil;
fields = cons (cstring_to_symbol ("globals"), fields);
fields = cons (cstring_to_symbol ("locals"), fields);
fields = cons (cstring_to_symbol ("name"), fields);
fields = cons (fields, cell_nil);
fields = cons (cell_symbol_module, fields);
return make_struct (record_type, fields, cell_unspecified);
}
SCM
make_initial_module (SCM a) ///((internal))
{
SCM module_type = make_module_type ();
a = acons (cell_symbol_module, module_type, a);
SCM hashq_type = make_hashq_type ();
a = acons (cell_symbol_hashq_table, hashq_type, a);
SCM name = cons (cstring_to_symbol ("boot"), cell_nil);
SCM globals = make_hash_table_ (0);
SCM locals = cell_nil;
SCM values = cell_nil;
values = cons (globals, values);
values = cons (locals, values);
values = cons (name, values);
values = cons (cell_symbol_module, values);
SCM module = make_struct (module_type, values, cstring_to_symbol ("module-printer"));
r0 = cell_nil;
r0 = cons (CADR (a), r0);
r0 = cons (CAR (a), r0);
m0 = module;
while (TYPE (a) == TPAIR)
{
module_define_x (module, CAAR (a), CDAR (a));
a = CDR (a);
}
return module;
}
SCM
module_printer (SCM module)
{
//module = m0;
fdputs ("#<", g_stdout); display_ (struct_ref_ (module, 2)); fdputc (' ', g_stdout);
fdputs ("name: ", g_stdout); display_ (struct_ref_ (module, 3)); fdputc (' ', g_stdout);
fdputs ("locals: ", g_stdout); display_ (struct_ref_ (module, 4)); fdputc (' ', g_stdout);
SCM table = struct_ref_ (module, 5);
fdputs ("globals:\n ", g_stdout);
display_ (table);
fdputc ('>', g_stdout);
}
SCM
module_variable (SCM module, SCM name)
{
//SCM locals = struct_ref_ (module, 3);
SCM locals = module;
SCM x = assq (name, locals);
if (x == cell_f)
{
module = m0;
SCM globals = struct_ref_ (module, 5);
x = hashq_get_handle (globals, name, cell_f);
}
return x;
}
SCM
module_ref (SCM module, SCM name)
{
SCM x = module_variable (module, name);
if (x == cell_f)
return cell_undefined;
return CDR (x);
}
SCM
module_define_x (SCM module, SCM name, SCM value)
{
module = m0;
SCM globals = struct_ref_ (module, 5);
return hashq_set_x (globals, name, value);
}