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
xassq (SCM x, SCM a) ///for speed in core only
{
while (a != cell_nil && x != CDAR (a)) a = CDR (a);
return a != cell_nil ? CAR (a) : cell_f;
}
SCM
length (SCM x)
{
int n = 0;
while (x != cell_nil)
{
n++;
if (TYPE (x) != PAIR) return MAKE_NUMBER (-1);
x = cdr (x);
}
return MAKE_NUMBER (n);
}
SCM
list (SCM x) ///((arity . n))
{
return x;
}
SCM
exit_ (SCM x) ///((name . "exit"))
{
assert (TYPE (x) == NUMBER);
exit (VALUE (x));
}
char const*
string_to_cstring (SCM s)
{
static char buf[1024];
char *p = buf;
s = STRING (s);
while (s != cell_nil)
{
*p++ = VALUE (car (s));
s = cdr (s);
}
*p = 0;
return buf;
}
int
error (char const* msg, SCM x)
{
fprintf (stderr, msg);
if (x) stderr_ (x);
fprintf (stderr, "\n");
assert(!msg);
}
SCM
assert_defined (SCM x, SCM e)
{
if (e == cell_undefined) error ("eval: unbound variable: ", x);
return e;
}
SCM
check_formals (SCM f, SCM formals, SCM args)
{
int flen = (TYPE (formals) == NUMBER) ? VALUE (formals) : VALUE (length (formals));
int alen = VALUE (length (args));
if (alen != flen && alen != -1 && flen != -1)
{
char buf[1024];
sprintf (buf, "apply: wrong number of arguments; expected: %d, got: %d: ", flen, alen);
error (buf, f);
}
return cell_unspecified;
}
SCM
check_apply (SCM f, SCM e)
{
char const* type = 0;
if (f == cell_f || f == cell_t) type = "bool";
if (TYPE (f) == CHAR) type = "char";
if (TYPE (f) == NUMBER) type = "number";
if (TYPE (f) == STRING) type = "string";
if (f == cell_unspecified) type = "*unspecified*";
if (f == cell_undefined) type = "*undefined*";
if (type)
{
char buf[1024];
sprintf (buf, "cannot apply: %s:", type);
fprintf (stderr, " [");
stderr_ (e);
fprintf (stderr, "]\n");
error (buf, f);
}
return cell_unspecified;
}
FILE *g_stdin;
int
dump ()
{
r1 = g_symbols;
gc (gc_push_frame ());
char *p = (char*)g_cells;
fputc ('M', stdout);
fputc ('E', stdout);
fputc ('S', stdout);
fputc (g_stack >> 8, stdout);
fputc (g_stack % 256, stdout);
for (int i=0; i<g_free.value * sizeof(scm); i++)
fputc (*p++, stdout);
return 0;
}
SCM
load_env (SCM a) ///((internal))
{
r0 =a;
g_stdin = fopen ("module/mes/read-0.mes", "r");
g_stdin = g_stdin ? g_stdin : fopen (PREFIX "module/mes/read-0.mes", "r");
if (!g_function) r0 = mes_builtins (r0);
r3 = read_input_file_env (r0);
g_stdin = stdin;
return r3;
}
SCM
bload_env (SCM a) ///((internal))
{
g_stdin = fopen ("module/mes/read-0.mo", "r");
g_stdin = g_stdin ? g_stdin : fopen (PREFIX "module/mes/read-0.mo", "r");
char *p = (char*)g_cells;
assert (getchar () == 'M');
assert (getchar () == 'E');
assert (getchar () == 'S');
g_stack = getchar () << 8;
g_stack += getchar ();
int c = getchar ();
while (c != EOF)
{
*p++ = c;
c = getchar ();
}
g_free.value = (p-(char*)g_cells) / sizeof (scm);
gc_peek_frame ();
g_symbols = r1;
g_stdin = stdin;
r0 = mes_builtins (r0);
return r3;
}