summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--libguile/lang.c140
-rw-r--r--libguile/lang.h71
2 files changed, 211 insertions, 0 deletions
diff --git a/libguile/lang.c b/libguile/lang.c
new file mode 100644
index 000000000..9f7d6fdcc
--- /dev/null
+++ b/libguile/lang.c
@@ -0,0 +1,140 @@
+/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
+ *
+ * This program 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 2, or (at your option)
+ * any later version.
+ *
+ * This program 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 this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
+ *
+ * As a special exception, the Free Software Foundation gives permission
+ * for additional uses of the text contained in its release of GUILE.
+ *
+ * The exception is that, if you link the GUILE library with other files
+ * to produce an executable, this does not by itself cause the
+ * resulting executable to be covered by the GNU General Public License.
+ * Your use of that executable is in no way restricted on account of
+ * linking the GUILE library code into it.
+ *
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ *
+ * This exception applies only to the code released by the
+ * Free Software Foundation under the name GUILE. If you copy
+ * code from other Free Software Foundation releases into a copy of
+ * GUILE, as the General Public License permits, the exception does
+ * not apply to the code that you add in this way. To avoid misleading
+ * anyone as to the status of such modified files, you must delete
+ * this exception notice from them.
+ *
+ * If you write modifications of your own for GUILE, it is your choice
+ * whether to permit this exception to apply to your modifications.
+ * If you do not wish that, delete this exception notice. */
+
+
+#include "_scm.h"
+
+#include "eval.h"
+#include "macros.h"
+
+#include "lang.h"
+
+
+
+/* {Multi-language support}
+ */
+
+/* Representation of pairs:
+ *
+ * Since we're going to share data with Scheme, we use EOL instead of nil
+ * in all data structures.
+ */
+
+SCM_PROC (s_nil_cons, "nil-cons", 2, 0, 0, scm_nil_cons);
+
+SCM
+scm_nil_cons (SCM x, SCM y)
+{
+ register SCM z;
+ SCM_NEWCELL (z);
+ SCM_SETCAR (z, x);
+ SCM_SETCDR (z, SCM_NIL2EOL (y, y));
+ return z;
+}
+
+
+SCM_PROC (s_nil_car, "nil-car", 1, 0, 0, scm_nil_car);
+
+SCM
+scm_nil_car (SCM x)
+{
+ if (SCM_NILP (x))
+ return scm_nil;
+ SCM_ASSERT (SCM_NIMP (x) && SCM_CONSP (x), x, SCM_ARG1, s_nil_car);
+ return SCM_CAR (x);
+}
+
+SCM_PROC (s_nil_cdr, "nil-cdr", 1, 0, 0, scm_nil_cdr);
+
+SCM
+scm_nil_cdr (SCM x)
+{
+ if (SCM_NILP (x))
+ return scm_nil;
+ SCM_ASSERT (SCM_NIMP (x) && SCM_CONSP (x), x, SCM_ARG1, s_nil_cdr);
+ return SCM_EOL2NIL (SCM_CDR (x), x);
+}
+
+SCM_PROC (s_null, "null", 1, 0, 0, scm_null);
+
+SCM
+scm_null (SCM x)
+{
+ return (SCM_NILP (x) || SCM_NULLP (x) || SCM_FALSEP (x)) ? scm_t : scm_nil;
+}
+
+SCM
+scm_m_while (SCM exp, SCM env)
+{
+ register SCM x = exp = SCM_CDR (exp);
+ SCM z = scm_eval_car (x, env);
+ while (!SCM_NILP (z) && SCM_NFALSEP (z))
+ {
+ while (SCM_NNULLP (x = SCM_CDR (x)))
+ {
+ if (SCM_NIMP (SCM_CAR (x)))
+ (*scm_ceval_ptr) (SCM_CAR (x), env);
+ }
+ z = scm_eval_car (x = exp, env);
+ }
+ return scm_nil;
+}
+
+SCM_PROC1 (s_nil_eq, "nil-eq", scm_tc7_rpsubr, scm_nil_eq);
+
+SCM
+scm_nil_eq (SCM x, SCM y)
+{
+ return (((x==y)
+ || (SCM_NILP (x) && (SCM_NULLP (y) || SCM_FALSEP (y)))
+ || (SCM_NILP (y) && (SCM_NULLP (x) || SCM_FALSEP (x))))
+ ? scm_t
+ : scm_nil);
+}
+
+
+
+void
+scm_init_lang ()
+{
+#include "lang.x"
+ scm_make_synt ("nil-while", scm_makacro, scm_m_while);
+}
diff --git a/libguile/lang.h b/libguile/lang.h
new file mode 100644
index 000000000..83485c247
--- /dev/null
+++ b/libguile/lang.h
@@ -0,0 +1,71 @@
+/* classes: h_files */
+
+#ifndef LANGH
+#define LANGH
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+ *
+ * This program 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 2, or (at your option)
+ * any later version.
+ *
+ * This program 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 this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
+ *
+ * As a special exception, the Free Software Foundation gives permission
+ * for additional uses of the text contained in its release of GUILE.
+ *
+ * The exception is that, if you link the GUILE library with other files
+ * to produce an executable, this does not by itself cause the
+ * resulting executable to be covered by the GNU General Public License.
+ * Your use of that executable is in no way restricted on account of
+ * linking the GUILE library code into it.
+ *
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ *
+ * This exception applies only to the code released by the
+ * Free Software Foundation under the name GUILE. If you copy
+ * code from other Free Software Foundation releases into a copy of
+ * GUILE, as the General Public License permits, the exception does
+ * not apply to the code that you add in this way. To avoid misleading
+ * anyone as to the status of such modified files, you must delete
+ * this exception notice from them.
+ *
+ * If you write modifications of your own for GUILE, it is your choice
+ * whether to permit this exception to apply to your modifications.
+ * If you do not wish that, delete this exception notice. */
+
+
+#include "libguile/__scm.h"
+
+
+
+extern SCM scm_nil;
+extern SCM scm_t;
+
+#define SCM_NILP(x) ((x) == scm_nil)
+#define SCM_NILNULLP(x) (SCM_NILP (x) || SCM_NULLP (x))
+#define SCM_NIL2EOL(x, tmp) ((tmp = (x)) == scm_nil ? SCM_EOL : tmp)
+#define SCM_EOL2NIL(x, tmp) (SCM_NULLP (tmp = (x)) ? scm_nil : tmp)
+#define SCM_EOL_IFY(x, tmp) (tmp = (x), SCM_NILP (tmp) ? SCM_EOL : tmp)
+#define SCM_NIL_IFY(x, tmp) (tmp = (x), SCM_NILP (tmp) ? scm_nil : tmp)
+
+
+
+extern SCM scm_nil_cons (SCM x, SCM y);
+extern SCM scm_nil_car (SCM x);
+extern SCM scm_nil_cdr (SCM x);
+extern SCM scm_null (SCM x);
+extern SCM scm_m_while (SCM exp, SCM env);
+extern SCM scm_nil_eq (SCM x, SCM y);
+extern void scm_init_lang SCM_P ((void));
+
+#endif /* PAIRSH */