-/* Copyright (C) 2000 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"
-#include "libguile/eval.h"
-#include "libguile/feature.h"
-#include "libguile/gc.h"
-#include "libguile/numbers.h"
-#include "libguile/ports.h"
-#include "libguile/root.h"
-#include "libguile/strings.h"
-#include "libguile/struct.h"
-#include "libguile/validate.h"
-
-#include "libguile/values.h"
-
-static SCM values_vtable;
-
-#define SCM_VALUESP(x) (SCM_STRUCTP (x)\
- && SCM_EQ_P (scm_struct_vtable (x), values_vtable))
-
-static SCM
-print_values (SCM obj, SCM pwps)
-{
- SCM values = scm_struct_ref (obj, SCM_INUM0);
- SCM port = SCM_PORT_WITH_PS_PORT (pwps);
- scm_print_state *ps = SCM_PRINT_STATE (SCM_PORT_WITH_PS_PS (pwps));
-
- while (SCM_CONSP (values))
- {
- scm_iprin1 (SCM_CAR (values), port, ps);
- values = SCM_CDR (values);
- if (SCM_CONSP (values))
- scm_newline (port);
- }
- return SCM_UNSPECIFIED;
-}
-
-SCM_DEFINE (scm_values, "values", 0, 0, 1,
- (SCM args),
- "Delivers all of its arguments to its continuation. Except for\n"
- "continuations created by the @code{call-with-values} procedure,\n"
- "all continuations take exactly one value. The effect of\n"
- "passing no value or more than one value to continuations that\n"
- "were not created by @code{call-with-values} is unspecified.")
-#define FUNC_NAME s_scm_values
-{
- long n;
- SCM result;
-
- SCM_VALIDATE_LIST_COPYLEN (1, args, n);
- if (n == 1)
- result = SCM_CAR (args);
- else
- {
- result = scm_make_struct (values_vtable, SCM_INUM0,
- scm_cons (args, SCM_EOL));
- }
-
- return result;
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_call_with_values, "call-with-values", 2, 0, 0,
- (SCM producer, SCM consumer),
- "Calls its @var{producer} argument with no values and a\n"
- "continuation that, when passed some values, calls the\n"
- "@var{consumer} procedure with those values as arguments. The\n"
- "continuation for the call to @var{consumer} is the continuation\n"
- "of the call to @code{call-with-values}.\n\n"
- "@example\n"
- "(call-with-values (lambda () (values 4 5))\n"
- " (lambda (a b) b))\n"
- " ==> 5\n\n"
- "@end example\n"
- "@example\n"
- "(call-with-values * -) ==> -1\n"
- "@end example")
-#define FUNC_NAME s_scm_call_with_values
-{
- SCM product;
-
- SCM_VALIDATE_PROC (1, producer);
- SCM_VALIDATE_PROC (2, consumer);
-
- product = scm_apply (producer, SCM_EOL, SCM_EOL);
- if (SCM_VALUESP (product))
- product = scm_struct_ref (product, SCM_INUM0);
- else
- product = scm_cons (product, SCM_EOL);
- return scm_apply (consumer, product, SCM_EOL);
-}
-#undef FUNC_NAME
-
-void
-scm_init_values (void)
-{
- SCM print = scm_make_subr ("%print-values", scm_tc7_subr_2, print_values);
-
- values_vtable
- = scm_permanent_object (scm_make_vtable_vtable (scm_makfrom0str ("pr"),
- SCM_INUM0, SCM_EOL));
- SCM_SET_STRUCT_PRINTER (values_vtable, print);
-
- scm_add_feature ("values");
-
-#ifndef SCM_MAGIC_SNARFER
-#include "libguile/values.x"
-#endif
-}
-
-/*
- Local Variables:
- c-file-style: "gnu"
- End:
-*/
+/* Copyright (C) 2000, 2001, 2006, 2008, 2009, 2011, 2012 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libguile/_scm.h"
+#include "libguile/eval.h"
+#include "libguile/feature.h"
+#include "libguile/gc.h"
+#include "libguile/numbers.h"
+#include "libguile/ports.h"
+#include "libguile/root.h"
+#include "libguile/strings.h"
+#include "libguile/struct.h"
+#include "libguile/validate.h"
+
+#include "libguile/values.h"
+
+SCM scm_values_vtable;
+
+/* OBJ must be a values object containing exactly two values.
+ scm_i_extract_values_2 puts those two values into *p1 and *p2. */
+void
+scm_i_extract_values_2 (SCM obj, SCM *p1, SCM *p2)
+{
+ SCM values;
+
+ SCM_ASSERT_TYPE (SCM_VALUESP (obj), obj, SCM_ARG1,
+ "scm_i_extract_values_2", "values");
+ values = scm_struct_ref (obj, SCM_INUM0);
+ if (scm_ilength (values) != 2)
+ scm_wrong_type_arg_msg
+ ("scm_i_extract_values_2", SCM_ARG1, obj,
+ "a values object containing exactly two values");
+ *p1 = SCM_CAR (values);
+ *p2 = SCM_CADR (values);
+}
+
+static SCM
+print_values (SCM obj, SCM pwps)
+{
+ SCM values = scm_struct_ref (obj, SCM_INUM0);
+ SCM port = SCM_PORT_WITH_PS_PORT (pwps);
+ scm_print_state *ps = SCM_PRINT_STATE (SCM_PORT_WITH_PS_PS (pwps));
+
+ scm_puts ("#<values ", port);
+ scm_iprin1 (values, port, ps);
+ scm_puts (">", port);
+
+ return SCM_UNSPECIFIED;
+}
+
+size_t
+scm_c_nvalues (SCM obj)
+{
+ if (SCM_LIKELY (SCM_VALUESP (obj)))
+ return scm_ilength (scm_struct_ref (obj, SCM_INUM0));
+ else
+ return 1;
+}
+
+SCM
+scm_c_value_ref (SCM obj, size_t idx)
+{
+ if (SCM_LIKELY (SCM_VALUESP (obj)))
+ {
+ SCM values = scm_struct_ref (obj, SCM_INUM0);
+ size_t i = idx;
+ while (SCM_LIKELY (scm_is_pair (values)))
+ {
+ if (i == 0)
+ return SCM_CAR (values);
+ values = SCM_CDR (values);
+ i--;
+ }
+ }
+ else if (idx == 0)
+ return obj;
+
+ scm_error (scm_out_of_range_key,
+ "scm_c_value_ref",
+ "Too few values in ~S to access index ~S",
+ scm_list_2 (obj, scm_from_size_t (idx)),
+ scm_list_1 (scm_from_size_t (idx)));
+}
+
+SCM_DEFINE (scm_values, "values", 0, 0, 1,
+ (SCM args),
+ "Delivers all of its arguments to its continuation. Except for\n"
+ "continuations created by the @code{call-with-values} procedure,\n"
+ "all continuations take exactly one value. The effect of\n"
+ "passing no value or more than one value to continuations that\n"
+ "were not created by @code{call-with-values} is unspecified.")
+#define FUNC_NAME s_scm_values
+{
+ long n;
+ SCM result;
+
+ SCM_VALIDATE_LIST_COPYLEN (1, args, n);
+ if (n == 1)
+ result = SCM_CAR (args);
+ else
+ result = scm_c_make_struct (scm_values_vtable, 0, 1, SCM_UNPACK (args));
+
+ return result;
+}
+#undef FUNC_NAME
+
+SCM
+scm_c_values (SCM *base, size_t nvalues)
+{
+ SCM ret, *walk;
+
+ if (nvalues == 1)
+ return *base;
+
+ for (ret = SCM_EOL, walk = base + nvalues - 1; walk >= base; walk--)
+ ret = scm_cons (*walk, ret);
+
+ return scm_values (ret);
+}
+
+void
+scm_init_values (void)
+{
+ SCM print = scm_c_define_gsubr ("%print-values", 2, 0, 0, print_values);
+
+ scm_values_vtable = scm_make_vtable (scm_from_locale_string ("pr"), print);
+
+ scm_add_feature ("values");
+
+#include "libguile/values.x"
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff