/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016 Jan Nieuwenhuizen
*
* This file is part of Mes.
*
* 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.
*
* 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 Mes. If not, see .
*/
SCM caar (SCM x) {return car (car (x));}
SCM cadr (SCM x) {return car (cdr (x));}
SCM cdar (SCM x) {return cdr (car (x));}
SCM cddr (SCM x) {return cdr (cdr (x));}
SCM caaar (SCM x) {return car (car (car (x)));}
SCM caadr (SCM x) {return car (car (cdr (x)));}
SCM caddr (SCM x) {return car (cdr (cdr (x)));}
SCM cdadr (SCM x) {return cdr (car (cdr (x)));}
SCM cadar (SCM x) {return car (cdr (car (x)));}
SCM cddar (SCM x) {return cdr (cdr (car (x)));}
SCM cdddr (SCM x) {return cdr (cdr (cdr (x)));}
SCM cadddr (SCM x) {return car (cdr (cdr (cdr (x))));}
SCM
length (SCM x)
{
int n = 0;
while (x != cell_nil)
{
n++;
x = cdr (x);
}
return make_number (n);
}
SCM
last_pair (SCM x)
{
while (x != cell_nil && cdr (x) != cell_nil)
x = cdr (x);
return x;
}
SCM
list (SCM x) ///((arity . n))
{
return x;
}
SCM
list_ref (SCM x, SCM k)
{
assert (TYPE (x) == PAIR);
assert (TYPE (k) == NUMBER);
int n = VALUE (k);
while (n-- && CDR (x) != cell_nil) x = CDR (x);
return x != cell_nil ? car (x) : cell_undefined;
}
SCM
vector_to_list (SCM v)
{
SCM x = cell_nil;
for (int i = 0; i < LENGTH (v); i++) {
SCM e = VECTOR (v)+i;
if (TYPE (e) == REF) e = g_cells[e].ref;
x = append2 (x, cons (e, cell_nil));
}
return x;
}
SCM
builtin_exit (SCM x)
{
assert (TYPE (x) == NUMBER);
exit (VALUE (x));
}