| 1 | /* Copyright (C) 1995,1996,2000,2001, 2003, 2006, 2008, 2009 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public License |
| 5 | * as published by the Free Software Foundation; either version 3 of |
| 6 | * the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 16 | * 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | \f |
| 21 | #ifdef HAVE_CONFIG_H |
| 22 | # include <config.h> |
| 23 | #endif |
| 24 | |
| 25 | #include "libguile/_scm.h" |
| 26 | #include "libguile/hashtab.h" |
| 27 | #include "libguile/alist.h" |
| 28 | #include "libguile/root.h" |
| 29 | #include "libguile/weaks.h" |
| 30 | #include "libguile/validate.h" |
| 31 | #include "libguile/eval.h" |
| 32 | |
| 33 | #include "libguile/properties.h" |
| 34 | \f |
| 35 | |
| 36 | /* {Properties} |
| 37 | */ |
| 38 | |
| 39 | static SCM properties_whash; |
| 40 | |
| 41 | SCM_DEFINE (scm_primitive_make_property, "primitive-make-property", 1, 0, 0, |
| 42 | (SCM not_found_proc), |
| 43 | "Create a @dfn{property token} that can be used with\n" |
| 44 | "@code{primitive-property-ref} and @code{primitive-property-set!}.\n" |
| 45 | "See @code{primitive-property-ref} for the significance of\n" |
| 46 | "@var{not_found_proc}.") |
| 47 | #define FUNC_NAME s_scm_primitive_make_property |
| 48 | { |
| 49 | if (not_found_proc != SCM_BOOL_F) |
| 50 | SCM_VALIDATE_PROC (SCM_ARG1, not_found_proc); |
| 51 | return scm_cons (not_found_proc, SCM_EOL); |
| 52 | } |
| 53 | #undef FUNC_NAME |
| 54 | |
| 55 | |
| 56 | SCM_DEFINE (scm_primitive_property_ref, "primitive-property-ref", 2, 0, 0, |
| 57 | (SCM prop, SCM obj), |
| 58 | "Return the property @var{prop} of @var{obj}.\n" |
| 59 | "\n" |
| 60 | "When no value has yet been associated with @var{prop} and\n" |
| 61 | "@var{obj}, the @var{not-found-proc} from @var{prop} is used. A\n" |
| 62 | "call @code{(@var{not-found-proc} @var{prop} @var{obj})} is made\n" |
| 63 | "and the result set as the property value. If\n" |
| 64 | "@var{not-found-proc} is @code{#f} then @code{#f} is the\n" |
| 65 | "property value.") |
| 66 | #define FUNC_NAME s_scm_primitive_property_ref |
| 67 | { |
| 68 | SCM h; |
| 69 | |
| 70 | SCM_VALIDATE_CONS (SCM_ARG1, prop); |
| 71 | |
| 72 | h = scm_hashq_get_handle (properties_whash, obj); |
| 73 | if (scm_is_true (h)) |
| 74 | { |
| 75 | SCM assoc = scm_assq (prop, SCM_CDR (h)); |
| 76 | if (scm_is_true (assoc)) |
| 77 | return SCM_CDR (assoc); |
| 78 | } |
| 79 | |
| 80 | if (scm_is_false (SCM_CAR (prop))) |
| 81 | return SCM_BOOL_F; |
| 82 | else |
| 83 | { |
| 84 | SCM val = scm_call_2 (SCM_CAR (prop), prop, obj); |
| 85 | if (scm_is_false (h)) |
| 86 | h = scm_hashq_create_handle_x (properties_whash, obj, SCM_EOL); |
| 87 | SCM_SETCDR (h, scm_acons (prop, val, SCM_CDR (h))); |
| 88 | return val; |
| 89 | } |
| 90 | } |
| 91 | #undef FUNC_NAME |
| 92 | |
| 93 | |
| 94 | SCM_DEFINE (scm_primitive_property_set_x, "primitive-property-set!", 3, 0, 0, |
| 95 | (SCM prop, SCM obj, SCM val), |
| 96 | "Set the property @var{prop} of @var{obj} to @var{val}.") |
| 97 | #define FUNC_NAME s_scm_primitive_property_set_x |
| 98 | { |
| 99 | SCM h, assoc; |
| 100 | SCM_VALIDATE_CONS (SCM_ARG1, prop); |
| 101 | h = scm_hashq_create_handle_x (properties_whash, obj, SCM_EOL); |
| 102 | assoc = scm_assq (prop, SCM_CDR (h)); |
| 103 | if (SCM_NIMP (assoc)) |
| 104 | SCM_SETCDR (assoc, val); |
| 105 | else |
| 106 | { |
| 107 | assoc = scm_acons (prop, val, SCM_CDR (h)); |
| 108 | SCM_SETCDR (h, assoc); |
| 109 | } |
| 110 | return SCM_UNSPECIFIED; |
| 111 | } |
| 112 | #undef FUNC_NAME |
| 113 | |
| 114 | |
| 115 | SCM_DEFINE (scm_primitive_property_del_x, "primitive-property-del!", 2, 0, 0, |
| 116 | (SCM prop, SCM obj), |
| 117 | "Remove any value associated with @var{prop} and @var{obj}.") |
| 118 | #define FUNC_NAME s_scm_primitive_property_del_x |
| 119 | { |
| 120 | SCM h; |
| 121 | SCM_VALIDATE_CONS (SCM_ARG1, prop); |
| 122 | h = scm_hashq_get_handle (properties_whash, obj); |
| 123 | if (scm_is_true (h)) |
| 124 | SCM_SETCDR (h, scm_assq_remove_x (SCM_CDR (h), prop)); |
| 125 | return SCM_UNSPECIFIED; |
| 126 | } |
| 127 | #undef FUNC_NAME |
| 128 | |
| 129 | |
| 130 | void |
| 131 | scm_init_properties () |
| 132 | { |
| 133 | properties_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED); |
| 134 | #include "libguile/properties.x" |
| 135 | } |
| 136 | |
| 137 | |
| 138 | /* |
| 139 | Local Variables: |
| 140 | c-file-style: "gnu" |
| 141 | End: |
| 142 | */ |