Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / libguile / variable.c

diff --git a/guile18/libguile/variable.c b/guile18/libguile/variable.c
new file mode 100644 (file)
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+++ b/guile18/libguile/variable.c
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+/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2006, 2008 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 2.1 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
+ */
+
+
+\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#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
+
+void
+scm_i_variable_print (SCM exp, SCM port, scm_print_state *pstate)
+{
+  scm_puts ("#<variable ", port);
+  scm_uintprint (SCM_UNPACK (exp), 16, port);
+  scm_puts (" value: ", port);
+  scm_iprin1 (SCM_VARIABLE_REF (exp), port, pstate);
+  scm_putc('>', port);
+}
+
+\f
+
+static SCM
+make_variable (SCM init)
+{
+  return scm_cell (scm_tc7_variable, SCM_UNPACK (init));
+}
+
+SCM_DEFINE (scm_make_variable, "make-variable", 1, 0, 0, 
+            (SCM init),
+            "Return a variable initialized to value @var{init}.")
+#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.")
+#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}.")
+#define FUNC_NAME s_scm_variable_p
+{
+  return scm_from_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_list_1 (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.")
+#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.")
+#define FUNC_NAME s_scm_variable_bound_p
+{
+  SCM_VALIDATE_VARIABLE (1, var);
+  return scm_from_bool (SCM_VARIABLE_REF (var) != SCM_UNDEFINED);
+}
+#undef FUNC_NAME
+
+
+void
+scm_init_variable ()
+{
+#include "libguile/variable.x"
+}
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/