libguile/kw.c

   1 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, the Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of GUILE.
  19  *
  20  * The exception is that, if you link the GUILE library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking the GUILE library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by the
  30  * Free Software Foundation under the name GUILE.  If you copy
  31  * code from other Free Software Foundation releases into a copy of
  32  * GUILE, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from them.
  36  *
  37  * If you write modifications of your own for GUILE, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  41 \f
  42
  43 #include <stdio.h>
  44 #include "_scm.h"
  45 #include "genio.h"
  46 #include "mbstrings.h"
  47 #include "smob.h"
  48
  49 #include "kw.h"
  50 \f
  51
  52
  53 static scm_sizet free_kw SCM_P ((SCM obj));
  54
  55 static scm_sizet
  56 free_kw (obj)
  57      SCM obj;
  58 {
  59   return 0;
  60 }
  61
  62
  63 static int prin_kw SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
  64
  65 static int
  66 prin_kw (exp, port, pstate)
  67      SCM exp;
  68      SCM port;
  69      scm_print_state *pstate;
  70 {
  71   scm_gen_puts (scm_regular_string, ":", port);
  72   scm_gen_puts((SCM_MB_STRINGP(SCM_CDR (exp))
  73                 ? scm_mb_string
  74                 : scm_regular_string),
  75                1 + SCM_CHARS (SCM_CDR (exp)),
  76                port);
  77   return 1;
  78 }
  79
  80 int scm_tc16_kw;
  81
  82 static scm_smobfuns kw_smob = {scm_markcdr, free_kw, prin_kw, 0};
  83
  84
  85
  86 SCM_PROC (s_make_keyword_from_dash_symbol, "make-keyword-from-dash-symbol", 1, 0, 0, scm_make_keyword_from_dash_symbol);
  87
  88 SCM
  89 scm_make_keyword_from_dash_symbol (symbol)
  90      SCM symbol;
  91 {
  92   SCM vcell;
  93
  94   SCM_ASSERT (SCM_NIMP (symbol) && SCM_SYMBOLP(symbol) && ('-' == SCM_CHARS(symbol)[0]),
  95           symbol, SCM_ARG1, s_make_keyword_from_dash_symbol);
  96
  97
  98   SCM_DEFER_INTS;
  99   vcell = scm_sym2ovcell_soft (symbol, scm_kw_obarray);
 100   if (vcell == SCM_BOOL_F)
 101     {
 102       SCM kw;
 103       SCM_NEWCELL(kw);
 104       SCM_SETCAR (kw, (SCM)scm_tc16_kw);
 105       SCM_SETCDR (kw, symbol);
 106       scm_intern_symbol (scm_kw_obarray, symbol);
 107       vcell = scm_sym2ovcell_soft (symbol, scm_kw_obarray);
 108       SCM_SETCDR (vcell, kw);
 109     }
 110   SCM_ALLOW_INTS;
 111   return SCM_CDR (vcell);
 112 }
 113
 114 SCM_PROC(s_keyword_p, "keyword?", 1, 0, 0, scm_keyword_p);
 115
 116 SCM
 117 scm_keyword_p (obj)
 118      SCM obj;
 119 {
 120   return ( (SCM_NIMP(obj) && SCM_KEYWORDP (obj))
 121           ? SCM_BOOL_T
 122           : SCM_BOOL_F);
 123 }
 124
 125
 126
 127 SCM_PROC(s_keyword_dash_symbol, "keyword-dash-symbol", 1, 0, 0, scm_keyword_dash_symbol);
 128
 129 SCM
 130 scm_keyword_dash_symbol (kw)
 131      SCM kw;
 132 {
 133   SCM_ASSERT (SCM_NIMP (kw) && SCM_KEYWORDP (kw), kw, SCM_ARG1, s_keyword_dash_symbol);
 134   return SCM_CDR (kw);
 135 }
 136
 137
 138
 139
 140
 141 void
 142 scm_init_kw ()
 143 {
 144   scm_tc16_kw = scm_newsmob (&kw_smob);
 145   scm_kw_obarray = scm_make_vector (SCM_MAKINUM (256), SCM_EOL, SCM_UNDEFINED);
 146 #include "kw.x"
 147 }
 148