| 1 | /* Copyright (C) 1995,1996,1998,2000,2001,2003,2004, 2006, 2008, 2009, 2010, 2011, 2012 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 | |
| 27 | #include "libguile/alist.h" |
| 28 | #include "libguile/eval.h" |
| 29 | #include "libguile/procs.h" |
| 30 | #include "libguile/gsubr.h" |
| 31 | #include "libguile/smob.h" |
| 32 | #include "libguile/root.h" |
| 33 | #include "libguile/vectors.h" |
| 34 | #include "libguile/weak-table.h" |
| 35 | #include "libguile/programs.h" |
| 36 | |
| 37 | #include "libguile/validate.h" |
| 38 | #include "libguile/procprop.h" |
| 39 | \f |
| 40 | |
| 41 | SCM_GLOBAL_SYMBOL (scm_sym_system_procedure, "system-procedure"); |
| 42 | SCM_GLOBAL_SYMBOL (scm_sym_name, "name"); |
| 43 | |
| 44 | static SCM overrides; |
| 45 | |
| 46 | static SCM arity_overrides; |
| 47 | |
| 48 | int |
| 49 | scm_i_procedure_arity (SCM proc, int *req, int *opt, int *rest) |
| 50 | { |
| 51 | SCM o; |
| 52 | |
| 53 | o = scm_weak_table_refq (arity_overrides, proc, SCM_BOOL_F); |
| 54 | |
| 55 | if (scm_is_true (o)) |
| 56 | { |
| 57 | *req = scm_to_int (scm_car (o)); |
| 58 | *opt = scm_to_int (scm_cadr (o)); |
| 59 | *rest = scm_is_true (scm_caddr (o)); |
| 60 | return 1; |
| 61 | } |
| 62 | |
| 63 | while (!SCM_PROGRAM_P (proc)) |
| 64 | { |
| 65 | if (SCM_STRUCTP (proc)) |
| 66 | { |
| 67 | if (!SCM_STRUCT_APPLICABLE_P (proc)) |
| 68 | return 0; |
| 69 | proc = SCM_STRUCT_PROCEDURE (proc); |
| 70 | } |
| 71 | else if (SCM_HAS_TYP7 (proc, scm_tc7_smob)) |
| 72 | { |
| 73 | if (!SCM_SMOB_APPLICABLE_P (proc)) |
| 74 | return 0; |
| 75 | if (!scm_i_program_arity (SCM_SMOB_DESCRIPTOR (proc).apply_trampoline, |
| 76 | req, opt, rest)) |
| 77 | return 0; |
| 78 | |
| 79 | /* The trampoline gets the smob too, which users don't |
| 80 | see. */ |
| 81 | *req -= 1; |
| 82 | |
| 83 | return 1; |
| 84 | } |
| 85 | else |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | return scm_i_program_arity (proc, req, opt, rest); |
| 90 | } |
| 91 | |
| 92 | SCM_DEFINE (scm_set_procedure_minimum_arity_x, "set-procedure-minimum-arity!", |
| 93 | 4, 0, 0, (SCM proc, SCM req, SCM opt, SCM rest), |
| 94 | "") |
| 95 | #define FUNC_NAME s_scm_set_procedure_minimum_arity_x |
| 96 | { |
| 97 | int t SCM_UNUSED; |
| 98 | |
| 99 | SCM_VALIDATE_PROC (1, proc); |
| 100 | SCM_VALIDATE_INT_COPY (2, req, t); |
| 101 | SCM_VALIDATE_INT_COPY (3, opt, t); |
| 102 | SCM_VALIDATE_BOOL (4, rest); |
| 103 | |
| 104 | scm_weak_table_putq_x (arity_overrides, proc, scm_list_3 (req, opt, rest)); |
| 105 | return SCM_UNDEFINED; |
| 106 | } |
| 107 | #undef FUNC_NAME |
| 108 | |
| 109 | SCM_DEFINE (scm_procedure_minimum_arity, "procedure-minimum-arity", 1, 0, 0, |
| 110 | (SCM proc), |
| 111 | "Return the \"minimum arity\" of a procedure.\n\n" |
| 112 | "If the procedure has only one arity, that arity is returned\n" |
| 113 | "as a list of three values: the number of required arguments,\n" |
| 114 | "the number of optional arguments, and a boolean indicating\n" |
| 115 | "whether or not the procedure takes rest arguments.\n\n" |
| 116 | "For a case-lambda procedure, the arity returned is the one\n" |
| 117 | "with the lowest minimum number of arguments, and the highest\n" |
| 118 | "maximum number of arguments.\n\n" |
| 119 | "If it was not possible to determine the arity of the procedure,\n" |
| 120 | "@code{#f} is returned.") |
| 121 | #define FUNC_NAME s_scm_procedure_minimum_arity |
| 122 | { |
| 123 | int req, opt, rest; |
| 124 | |
| 125 | if (scm_i_procedure_arity (proc, &req, &opt, &rest)) |
| 126 | return scm_list_3 (scm_from_int (req), |
| 127 | scm_from_int (opt), |
| 128 | scm_from_bool (rest)); |
| 129 | else |
| 130 | return SCM_BOOL_F; |
| 131 | } |
| 132 | #undef FUNC_NAME |
| 133 | |
| 134 | SCM_DEFINE (scm_procedure_properties, "procedure-properties", 1, 0, 0, |
| 135 | (SCM proc), |
| 136 | "Return @var{proc}'s property list.") |
| 137 | #define FUNC_NAME s_scm_procedure_properties |
| 138 | { |
| 139 | SCM ret; |
| 140 | |
| 141 | SCM_VALIDATE_PROC (1, proc); |
| 142 | |
| 143 | ret = scm_weak_table_refq (overrides, proc, SCM_BOOL_F); |
| 144 | |
| 145 | if (scm_is_false (ret)) |
| 146 | { |
| 147 | if (SCM_PROGRAM_P (proc)) |
| 148 | ret = scm_i_program_properties (proc); |
| 149 | else |
| 150 | ret = SCM_EOL; |
| 151 | } |
| 152 | |
| 153 | return ret; |
| 154 | } |
| 155 | #undef FUNC_NAME |
| 156 | |
| 157 | SCM_DEFINE (scm_set_procedure_properties_x, "set-procedure-properties!", 2, 0, 0, |
| 158 | (SCM proc, SCM alist), |
| 159 | "Set @var{proc}'s property list to @var{alist}.") |
| 160 | #define FUNC_NAME s_scm_set_procedure_properties_x |
| 161 | { |
| 162 | SCM_VALIDATE_PROC (1, proc); |
| 163 | |
| 164 | scm_weak_table_putq_x (overrides, proc, alist); |
| 165 | |
| 166 | return SCM_UNSPECIFIED; |
| 167 | } |
| 168 | #undef FUNC_NAME |
| 169 | |
| 170 | SCM_DEFINE (scm_procedure_property, "procedure-property", 2, 0, 0, |
| 171 | (SCM proc, SCM key), |
| 172 | "Return the property of @var{proc} with name @var{key}.") |
| 173 | #define FUNC_NAME s_scm_procedure_property |
| 174 | { |
| 175 | SCM_VALIDATE_PROC (1, proc); |
| 176 | |
| 177 | return scm_assq_ref (scm_procedure_properties (proc), key); |
| 178 | } |
| 179 | #undef FUNC_NAME |
| 180 | |
| 181 | SCM_DEFINE (scm_set_procedure_property_x, "set-procedure-property!", 3, 0, 0, |
| 182 | (SCM proc, SCM key, SCM val), |
| 183 | "In @var{proc}'s property list, set the property named @var{key} to\n" |
| 184 | "@var{val}.") |
| 185 | #define FUNC_NAME s_scm_set_procedure_property_x |
| 186 | { |
| 187 | SCM props; |
| 188 | |
| 189 | SCM_VALIDATE_PROC (1, proc); |
| 190 | |
| 191 | scm_i_pthread_mutex_lock (&scm_i_misc_mutex); |
| 192 | props = scm_weak_table_refq (overrides, proc, SCM_BOOL_F); |
| 193 | if (scm_is_false (props)) |
| 194 | { |
| 195 | if (SCM_PROGRAM_P (proc)) |
| 196 | props = scm_i_program_properties (proc); |
| 197 | else |
| 198 | props = SCM_EOL; |
| 199 | } |
| 200 | scm_weak_table_putq_x (overrides, proc, scm_assq_set_x (props, key, val)); |
| 201 | scm_i_pthread_mutex_unlock (&scm_i_misc_mutex); |
| 202 | |
| 203 | return SCM_UNSPECIFIED; |
| 204 | } |
| 205 | #undef FUNC_NAME |
| 206 | |
| 207 | \f |
| 208 | |
| 209 | |
| 210 | void |
| 211 | scm_init_procprop () |
| 212 | { |
| 213 | overrides = scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY); |
| 214 | arity_overrides = scm_c_make_weak_table (0, SCM_WEAK_TABLE_KIND_KEY); |
| 215 | #include "libguile/procprop.x" |
| 216 | } |
| 217 | |
| 218 | |
| 219 | /* |
| 220 | Local Variables: |
| 221 | c-file-style: "gnu" |
| 222 | End: |
| 223 | */ |