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136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/* Copyright (C) 1995,1996,2000,2001, 2003 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libguile/_scm.h"
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#include "libguile/hashtab.h"
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#include "libguile/alist.h"
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#include "libguile/root.h"
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#include "libguile/weaks.h"
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#include "libguile/validate.h"
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#include "libguile/eval.h"
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#include "libguile/properties.h"
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/* {Properties}
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*/
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SCM_DEFINE (scm_primitive_make_property, "primitive-make-property", 1, 0, 0,
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(SCM not_found_proc),
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"Create a @dfn{property token} that can be used with\n"
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"@code{primitive-property-ref} and @code{primitive-property-set!}.\n"
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"See @code{primitive-property-ref} for the significance of\n"
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"@var{not_found_proc}.")
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#define FUNC_NAME s_scm_primitive_make_property
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{
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if (not_found_proc != SCM_BOOL_F)
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SCM_VALIDATE_PROC (SCM_ARG1, not_found_proc);
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return scm_cons (not_found_proc, SCM_EOL);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_primitive_property_ref, "primitive-property-ref", 2, 0, 0,
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(SCM prop, SCM obj),
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"Return the property @var{prop} of @var{obj}.\n"
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"\n"
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"When no value has yet been associated with @var{prop} and\n"
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"@var{obj}, the @var{not-found-proc} from @var{prop} is used. A\n"
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"call @code{(@var{not-found-proc} @var{prop} @var{obj})} is made\n"
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"and the result set as the property value. If\n"
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"@var{not-found-proc} is @code{#f} then @code{#f} is the\n"
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"property value.")
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#define FUNC_NAME s_scm_primitive_property_ref
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{
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SCM h;
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SCM_VALIDATE_CONS (SCM_ARG1, prop);
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h = scm_hashq_get_handle (scm_properties_whash, obj);
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if (scm_is_true (h))
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{
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SCM assoc = scm_assq (prop, SCM_CDR (h));
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if (scm_is_true (assoc))
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return SCM_CDR (assoc);
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}
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if (scm_is_false (SCM_CAR (prop)))
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return SCM_BOOL_F;
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else
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{
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SCM val = scm_call_2 (SCM_CAR (prop), prop, obj);
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if (scm_is_false (h))
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h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL);
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SCM_SETCDR (h, scm_acons (prop, val, SCM_CDR (h)));
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return val;
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}
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_primitive_property_set_x, "primitive-property-set!", 3, 0, 0,
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(SCM prop, SCM obj, SCM val),
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"Set the property @var{prop} of @var{obj} to @var{val}.")
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#define FUNC_NAME s_scm_primitive_property_set_x
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{
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SCM h, assoc;
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SCM_VALIDATE_CONS (SCM_ARG1, prop);
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h = scm_hashq_create_handle_x (scm_properties_whash, obj, SCM_EOL);
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assoc = scm_assq (prop, SCM_CDR (h));
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if (SCM_NIMP (assoc))
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SCM_SETCDR (assoc, val);
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else
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{
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assoc = scm_acons (prop, val, SCM_CDR (h));
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SCM_SETCDR (h, assoc);
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}
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_primitive_property_del_x, "primitive-property-del!", 2, 0, 0,
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(SCM prop, SCM obj),
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"Remove any value associated with @var{prop} and @var{obj}.")
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#define FUNC_NAME s_scm_primitive_property_del_x
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{
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SCM h;
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SCM_VALIDATE_CONS (SCM_ARG1, prop);
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h = scm_hashq_get_handle (scm_properties_whash, obj);
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if (scm_is_true (h))
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SCM_SETCDR (h, scm_assq_remove_x (SCM_CDR (h), prop));
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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void
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scm_init_properties ()
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{
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scm_properties_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
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#include "libguile/properties.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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