1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240
|
/* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
#include <stdio.h>
#include "_scm.h"
#include "eq.h"
#include "genio.h"
#include "smob.h"
#include "variable.h"
static int prin_var SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
static int
prin_var (exp, port, pstate)
SCM exp;
SCM port;
scm_print_state *pstate;
{
scm_puts ("#<variable ", port);
scm_intprint(exp, 16, port);
{
SCM val_cell;
val_cell = SCM_CDR(exp);
if (SCM_CAR (val_cell) != SCM_UNDEFINED)
{
scm_puts (" name: ", port);
scm_iprin1 (SCM_CAR (val_cell), port, pstate);
}
scm_puts (" binding: ", port);
scm_iprin1 (SCM_CDR (val_cell), port, pstate);
}
scm_putc('>', port);
return 1;
}
static SCM scm_markvar SCM_P ((SCM ptr));
static SCM
scm_markvar (ptr)
SCM ptr;
{
return SCM_CDR (ptr);
}
static SCM var_equal SCM_P ((SCM var1, SCM var2));
static SCM
var_equal (var1, var2)
SCM var1;
SCM var2;
{
return scm_equal_p (SCM_CDR (var1), SCM_CDR (var2));
}
int scm_tc16_variable;
static SCM anonymous_variable_sym;
static SCM make_vcell_variable SCM_P ((SCM vcell));
static SCM
make_vcell_variable (vcell)
SCM vcell;
{
SCM_RETURN_NEWSMOB (scm_tc16_variable, vcell);
}
SCM_PROC(s_make_variable, "make-variable", 1, 1, 0, scm_make_variable);
SCM
scm_make_variable (init, name_hint)
SCM init;
SCM name_hint;
{
SCM val_cell;
if (name_hint == SCM_UNDEFINED)
name_hint = anonymous_variable_sym;
SCM_NEWCELL(val_cell);
SCM_DEFER_INTS;
SCM_SETCAR (val_cell, name_hint);
SCM_SETCDR (val_cell, init);
SCM_ALLOW_INTS;
return make_vcell_variable (val_cell);
}
SCM_PROC(s_make_undefined_variable, "make-undefined-variable", 0, 1, 0, scm_make_undefined_variable);
SCM
scm_make_undefined_variable (name_hint)
SCM name_hint;
{
SCM vcell;
if (name_hint == SCM_UNDEFINED)
name_hint = anonymous_variable_sym;
SCM_NEWCELL (vcell);
SCM_DEFER_INTS;
SCM_SETCAR (vcell, name_hint);
SCM_SETCDR (vcell, SCM_UNDEFINED);
SCM_ALLOW_INTS;
return make_vcell_variable (vcell);
}
SCM_PROC(s_variable_p, "variable?", 1, 0, 0, scm_variable_p);
SCM
scm_variable_p (obj)
SCM obj;
{
return ( (SCM_NIMP(obj) && SCM_VARIABLEP (obj))
? SCM_BOOL_T
: SCM_BOOL_F);
}
SCM_PROC(s_variable_ref, "variable-ref", 1, 0, 0, scm_variable_ref);
SCM
scm_variable_ref (var)
SCM var;
{
SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP(var), var, SCM_ARG1, s_variable_ref);
return SCM_CDR (SCM_CDR (var));
}
SCM_PROC(s_variable_set_x, "variable-set!", 2, 0, 0, scm_variable_set_x);
SCM
scm_variable_set_x (var, val)
SCM var;
SCM val;
{
SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_set_x);
SCM_SETCDR (SCM_CDR (var), val);
return SCM_UNSPECIFIED;
}
SCM_PROC(s_builtin_variable, "builtin-variable", 1, 0, 0, scm_builtin_variable);
SCM
scm_builtin_variable (name)
SCM name;
{
SCM vcell;
SCM var_slot;
SCM_ASSERT (SCM_NIMP (name) && SCM_SYMBOLP (name), name, SCM_ARG1, s_builtin_variable);
vcell = scm_sym2vcell (name, SCM_BOOL_F, SCM_BOOL_T);
if (vcell == SCM_BOOL_F)
return SCM_BOOL_F;
scm_intern_symbol (scm_symhash_vars, name);
var_slot = scm_sym2ovcell (name, scm_symhash_vars);
SCM_DEFER_INTS;
if ( SCM_IMP (SCM_CDR (var_slot))
|| (SCM_VARVCELL (var_slot) != vcell))
SCM_SETCDR (var_slot, make_vcell_variable (vcell));
SCM_ALLOW_INTS;
return SCM_CDR (var_slot);
}
SCM_PROC(s_variable_bound_p, "variable-bound?", 1, 0, 0, scm_variable_bound_p);
SCM
scm_variable_bound_p (var)
SCM var;
{
SCM_ASSERT (SCM_NIMP(var) && SCM_VARIABLEP (var), var, SCM_ARG1, s_variable_bound_p);
return (SCM_UNBNDP (SCM_CDR (SCM_VARVCELL (var)))
? SCM_BOOL_F
: SCM_BOOL_T);
}
void
scm_init_variable ()
{
scm_tc16_variable = scm_make_smob_type_mfpe ("variable", 0,
scm_markvar, NULL, prin_var, var_equal);
anonymous_variable_sym = SCM_CAR (scm_sysintern ("anonymous-variable", SCM_UNDEFINED));
#include "variable.x"
}
|