-/* 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, 675 Mass Ave, Cambridge, MA 02139, 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.
- */
-\f
-
-#include <stdio.h>
-#include "_scm.h"
-#include "genio.h"
-#include "smob.h"
-
-#include "variable.h"
-\f
-
-static scm_sizet free_var SCM_P ((SCM obj));
-
-static scm_sizet
-free_var (obj)
- SCM obj;
-{
- return 0;
-}
-
-
-
-static int prin_var SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
-
-static int
-prin_var (exp, port, pstate)
- SCM exp;
- SCM port;
- scm_print_state *pstate;
-{
- scm_gen_puts (scm_regular_string, "#<variable ", port);
- scm_intprint(exp, 16, port);
- {
- SCM val_cell;
- val_cell = SCM_CDR(exp);
- if (SCM_CAR (val_cell) != SCM_UNDEFINED)
- {
- scm_gen_puts (scm_regular_string, " name: ", port);
- scm_iprin1 (SCM_CAR (val_cell), port, pstate);
- }
- scm_gen_puts (scm_regular_string, " binding: ", port);
- scm_iprin1 (SCM_CDR (val_cell), port, pstate);
- }
- scm_gen_putc('>', port);
- return 1;
-}
-
-
-static SCM scm_markvar SCM_P ((SCM ptr));
-
-static SCM
-scm_markvar (ptr)
- SCM ptr;
-{
- if (SCM_GC8MARKP (ptr))
- return SCM_BOOL_F;
- SCM_SETGC8MARK (ptr);
- return SCM_CDR (ptr);
-}
-
-int scm_tc16_variable;
-static scm_smobfuns variable_smob = {scm_markvar, free_var, prin_var, 0};
-\f
-
-static SCM anonymous_variable_sym;
-
-
-static SCM make_vcell_variable SCM_P ((SCM vcell));
-
-static SCM
-make_vcell_variable (vcell)
- SCM vcell;
-{
- SCM answer;
- SCM_NEWCELL(answer);
- SCM_REDEFER_INTS;
- SCM_SETCAR (answer, scm_tc16_variable);
- SCM_SETCDR (answer, vcell);
- SCM_REALLOW_INTS;
- return answer;
-}
-
-SCM_PROC(s_make_variable, "make-variable", 1, 1, 0, scm_make_variable);
-
-SCM
-scm_make_variable (init, name_hint)
- SCM init;
- SCM name_hint;
-{
- SCM val_cell;
-
- if (name_hint == SCM_UNDEFINED)
- name_hint = anonymous_variable_sym;
-
- SCM_NEWCELL(val_cell);
- SCM_DEFER_INTS;
- SCM_SETCAR (val_cell, name_hint);
- SCM_SETCDR (val_cell, init);
- SCM_ALLOW_INTS;
- return make_vcell_variable (val_cell);
-}
-
-
-SCM_PROC(s_make_undefined_variable, "make-undefined-variable", 0, 1, 0, scm_make_undefined_variable);
-
-SCM
-scm_make_undefined_variable (name_hint)
- SCM name_hint;
-{
- SCM vcell;
-
- if (name_hint == SCM_UNDEFINED)
- name_hint = anonymous_variable_sym;
-
- SCM_NEWCELL (vcell);
- SCM_DEFER_INTS;
- SCM_SETCAR (vcell, name_hint);
- SCM_SETCDR (vcell, SCM_UNDEFINED);
- SCM_ALLOW_INTS;
- return make_vcell_variable (vcell);
-}
-
-
-SCM_PROC(s_variable_p, "variable?", 1, 0, 0, scm_variable_p);
-
-SCM
-scm_variable_p (obj)
- SCM obj;
-{
- return ( (SCM_NIMP(obj) && SCM_VARIABLEP (obj))
- ? SCM_BOOL_T
- : SCM_BOOL_F);
-}
-
-
-SCM_PROC(s_variable_ref, "variable-ref", 1, 0, 0, scm_variable_ref);
-
-SCM
-scm_variable_ref (var)
- SCM var;
-{
- SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP(var), var, SCM_ARG1, s_variable_ref);
- return SCM_CDR (SCM_CDR (var));
-}
-
-
-
-SCM_PROC(s_variable_set_x, "variable-set!", 2, 0, 0, scm_variable_set_x);
-
-SCM
-scm_variable_set_x (var, val)
- SCM var;
- SCM val;
-{
- SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_set_x);
- SCM_SETCDR (SCM_CDR (var), val);
- return SCM_UNSPECIFIED;
-}
-
-
-SCM_PROC(s_builtin_variable, "builtin-variable", 1, 0, 0, scm_builtin_variable);
-
-SCM
-scm_builtin_variable (name)
- SCM name;
-{
- SCM vcell;
- SCM var_slot;
-
- SCM_ASSERT (SCM_NIMP (name) && SCM_SYMBOLP (name), name, SCM_ARG1, s_builtin_variable);
- vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T);
- if (vcell == SCM_BOOL_F)
- return SCM_BOOL_F;
-
- scm_intern_symbol (scm_symhash_vars, name);
- var_slot = scm_sym2ovcell (name, scm_symhash_vars);
-
- SCM_DEFER_INTS;
- if ( SCM_IMP (SCM_CDR (var_slot))
- || (SCM_VARVCELL (var_slot) != vcell))
- SCM_SETCDR (var_slot, make_vcell_variable (vcell));
- SCM_ALLOW_INTS;
-
- return SCM_CDR (var_slot);
-}
-
-
-SCM_PROC(s_variable_bound_p, "variable-bound?", 1, 0, 0, scm_variable_bound_p);
-
-SCM
-scm_variable_bound_p (var)
- SCM var;
-{
- SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_bound_p);
- return (SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var)))
- ? SCM_BOOL_F
- : SCM_BOOL_T);
-}
-
-
-
-
-void
-scm_init_variable ()
-{
- scm_tc16_variable = scm_newsmob (&variable_smob);
- anonymous_variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED));
-#include "variable.x"
-}
-
+/* Copyright (C) 1995,1996,1997,1998,2000,2001 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. */
+
+/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
+ gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
+
+\f
+
+#include "libguile/_scm.h"
+#include "libguile/eq.h"
+#include "libguile/ports.h"
+#include "libguile/root.h"
+#include "libguile/smob.h"
+#include "libguile/deprecation.h"
+
+#include "libguile/validate.h"
+#include "libguile/variable.h"
+\f
+scm_t_bits scm_tc16_variable;
+
+static int
+variable_print (SCM exp, SCM port, scm_print_state *pstate)
+{
+ scm_puts ("#<variable ", port);
+ scm_intprint (SCM_UNPACK (exp), 16, port);
+ scm_puts (" binding: ", port);
+ scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate);
+ scm_putc('>', port);
+ return 1;
+}
+
+static SCM
+variable_equalp (SCM var1, SCM var2)
+{
+ return scm_equal_p (SCM_VARIABLE_REF (var1), SCM_VARIABLE_REF (var2));
+}
+\f
+
+#if SCM_ENABLE_VCELLS
+SCM_SYMBOL (sym_huh, "???");
+#endif
+
+static SCM
+make_variable (SCM init)
+{
+#if !SCM_ENABLE_VCELLS
+ SCM_RETURN_NEWSMOB (scm_tc16_variable, SCM_UNPACK (init));
+#else
+ SCM_RETURN_NEWSMOB (scm_tc16_variable, scm_cons (sym_huh, init));
+#endif
+}
+
+SCM_DEFINE (scm_make_variable, "make-variable", 1, 0, 0,
+ (SCM init),
+ "Return a variable initialized to value @var{init}.\n")
+#define FUNC_NAME s_scm_make_variable
+{
+ return make_variable (init);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_make_undefined_variable, "make-undefined-variable", 0, 0, 0,
+ (),
+ "Return a variable that is initially unbound.\n")
+#define FUNC_NAME s_scm_make_undefined_variable
+{
+ return make_variable (SCM_UNDEFINED);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_variable_p, "variable?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} iff @var{obj} is a variable object, else\n"
+ "return @code{#f}\n")
+#define FUNC_NAME s_scm_variable_p
+{
+ return SCM_BOOL (SCM_VARIABLEP (obj));
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_variable_ref, "variable-ref", 1, 0, 0,
+ (SCM var),
+ "Dereference @var{var} and return its value.\n"
+ "@var{var} must be a variable object; see @code{make-variable}\n"
+ "and @code{make-undefined-variable}.")
+#define FUNC_NAME s_scm_variable_ref
+{
+ SCM val;
+ SCM_VALIDATE_VARIABLE (1, var);
+ val = SCM_VARIABLE_REF (var);
+ if (val == SCM_UNDEFINED)
+ SCM_MISC_ERROR ("variable is unbound: ~S", SCM_LIST1 (var));
+ return val;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_variable_set_x, "variable-set!", 2, 0, 0,
+ (SCM var, SCM val),
+ "Set the value of the variable @var{var} to @var{val}.\n"
+ "@var{var} must be a variable object, @var{val} can be any\n"
+ "value. Return an unspecified value.\n")
+#define FUNC_NAME s_scm_variable_set_x
+{
+ SCM_VALIDATE_VARIABLE (1, var);
+ SCM_VARIABLE_SET (var, val);
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_variable_bound_p, "variable-bound?", 1, 0, 0,
+ (SCM var),
+ "Return @code{#t} iff @var{var} is bound to a value.\n"
+ "Throws an error if @var{var} is not a variable object.\n")
+#define FUNC_NAME s_scm_variable_bound_p
+{
+ SCM_VALIDATE_VARIABLE (1, var);
+ return SCM_BOOL (SCM_VARIABLE_REF (var) != SCM_UNDEFINED);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_variable_set_name_hint, "variable-set-name-hint!", 2, 0, 0,
+ (SCM var, SCM hint),
+ "Do not use this function.")
+#define FUNC_NAME s_scm_variable_set_name_hint
+{
+ SCM_VALIDATE_VARIABLE (1, var);
+ SCM_VALIDATE_SYMBOL (2, hint);
+#if SCM_ENABLE_VCELLS
+ SCM_SETCAR (SCM_SMOB_DATA (var), hint);
+#endif
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+#if SCM_ENABLE_VCELLS
+
+SCM_DEFINE (scm_builtin_variable, "builtin-variable", 1, 0, 0,
+ (SCM name),
+ "Return the built-in variable with the name @var{name}.\n"
+ "@var{name} must be a symbol (not a string).\n"
+ "Then use @code{variable-ref} to access its value.\n")
+#define FUNC_NAME s_scm_builtin_variable
+{
+ SCM_VALIDATE_SYMBOL (1,name);
+ scm_c_issue_deprecation_warning ("`builtin-variable' is deprecated. "
+ "Use module system operations instead.");
+ return scm_sym2var (name, SCM_BOOL_F, SCM_BOOL_T);
+}
+#undef FUNC_NAME
+
+#endif /* SCM_ENABLE_VCELLS */
+
+void
+scm_init_variable ()
+{
+ scm_tc16_variable = scm_make_smob_type ("variable", 0);
+ scm_set_smob_mark (scm_tc16_variable, scm_markcdr);
+ scm_set_smob_print (scm_tc16_variable, variable_print);
+ scm_set_smob_equalp (scm_tc16_variable, variable_equalp);
+
+#ifndef SCM_MAGIC_SNARFER
+#include "libguile/variable.x"
+#endif
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff