Import guile-1.8 as multiple upstream tarball component

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

diff --git a/guile18/libguile/properties.c b/guile18/libguile/properties.c
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+++ b/guile18/libguile/properties.c
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+/* Copyright (C) 1995,1996,2000,2001, 2003, 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/hashtab.h"
+#include "libguile/alist.h"
+#include "libguile/root.h"
+#include "libguile/weaks.h"
+#include "libguile/validate.h"
+#include "libguile/eval.h"
+
+#include "libguile/properties.h"
+\f
+
+/* {Properties}
+ */
+
+SCM_DEFINE (scm_primitive_make_property, "primitive-make-property", 1, 0, 0,
+           (SCM not_found_proc),
+           "Create a @dfn{property token} that can be used with\n"
+           "@code{primitive-property-ref} and @code{primitive-property-set!}.\n"
+           "See @code{primitive-property-ref} for the significance of\n"
+           "@var{not_found_proc}.")
+#define FUNC_NAME s_scm_primitive_make_property
+{
+  if (not_found_proc != SCM_BOOL_F)
+    SCM_VALIDATE_PROC (SCM_ARG1, not_found_proc);
+  return scm_cons (not_found_proc, SCM_EOL);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_primitive_property_ref, "primitive-property-ref", 2, 0, 0,
+           (SCM prop, SCM obj),
+           "Return the property @var{prop} of @var{obj}.\n"
+           "\n"
+           "When no value has yet been associated with @var{prop} and\n"
+           "@var{obj}, the @var{not-found-proc} from @var{prop} is used.  A\n"
+           "call @code{(@var{not-found-proc} @var{prop} @var{obj})} is made\n"
+           "and the result set as the property value.  If\n"
+           "@var{not-found-proc} is @code{#f} then @code{#f} is the\n"
+           "property value.")
+#define FUNC_NAME s_scm_primitive_property_ref
+{
+  SCM h;
+
+  SCM_VALIDATE_CONS (SCM_ARG1, prop);
+
+  h = scm_hashq_get_handle (scm_properties_whash, obj);
+  if (scm_is_true (h))
+    {
+      SCM assoc = scm_assq (prop, SCM_CDR (h));
+      if (scm_is_true (assoc))
+       return SCM_CDR (assoc);
+    }
+
+  if (scm_is_false (SCM_CAR (prop)))
+    return SCM_BOOL_F;
+  else
+    {
+      SCM val = scm_call_2 (SCM_CAR (prop), prop, obj);
+      if (scm_is_false (h))
+       h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL);
+      SCM_SETCDR (h, scm_acons (prop, val, SCM_CDR (h)));
+      return val;
+    }
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_primitive_property_set_x, "primitive-property-set!", 3, 0, 0,
+           (SCM prop, SCM obj, SCM val),
+           "Set the property @var{prop} of @var{obj} to @var{val}.")
+#define FUNC_NAME s_scm_primitive_property_set_x
+{
+  SCM h, assoc;
+  SCM_VALIDATE_CONS (SCM_ARG1, prop);
+  h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL);
+  assoc = scm_assq (prop, SCM_CDR (h));
+  if (SCM_NIMP (assoc))
+    SCM_SETCDR (assoc, val);
+  else
+    {
+      assoc = scm_acons (prop, val, SCM_CDR (h));
+      SCM_SETCDR (h, assoc);
+    }
+  return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_primitive_property_del_x, "primitive-property-del!", 2, 0, 0,
+           (SCM prop, SCM obj),
+           "Remove any value associated with @var{prop} and @var{obj}.")
+#define FUNC_NAME s_scm_primitive_property_del_x
+{
+  SCM h;
+  SCM_VALIDATE_CONS (SCM_ARG1, prop);
+  h = scm_hashq_get_handle (scm_properties_whash, obj);
+  if (scm_is_true (h))
+    SCM_SETCDR (h, scm_assq_remove_x (SCM_CDR (h), prop));
+  return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+
+void
+scm_init_properties ()
+{
+  scm_properties_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
+#include "libguile/properties.x"
+}
+
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/