mes/lib.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
*
* 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 <http://www.gnu.org/licenses/>.
*/
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 *
length (scm *x)
{
int n = 0;
while (x != &scm_nil)
{
n++;
x = cdr (x);
}
return make_number (n);
}
scm *
last_pair (scm *x)
{
while (x != &scm_nil && cdr (x) != &scm_nil)
x = cdr (x);
return x;
}
scm *
list (scm *x) ///((arity . n))
{
return x;
}
scm *
list_ref (scm *x, scm *k)
{
assert (x->type == PAIR);
assert (k->type == NUMBER);
int n = k->value;
while (n-- && x->cdr != &scm_nil) x = x->cdr;
return x != &scm_nil ? x->car : &scm_undefined;
}
scm *
vector_to_list (scm *v)
{
scm *x = &scm_nil;
for (int i = 0; i < v->length; i++) {
scm *e = &v->vector[i];
if (e->type == REF) e = e->ref;
x = append2 (x, cons (e, &scm_nil));
}
return x;
}
scm *
integer_to_char (scm *x)
{
assert (x->type == NUMBER);
return make_char (x->value);
}
scm *
char_to_integer (scm *x)
{
assert (x->type == CHAR);
return make_number (x->value);
}
scm *
builtin_exit (scm *x)
{
assert (x->type == NUMBER);
exit (x->value);
}