libguile/keywords.c

   1 /* Copyright (C) 1995,1996,1997,1998, 1999, 2000 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, Inc., 59 Temple Place, Suite 330,
  16  * Boston, MA 02111-1307 USA
  17  *
  18  * As a special exception, the Free Software Foundation gives permission
  19  * for additional uses of the text contained in its release of GUILE.
  20  *
  21  * The exception is that, if you link the GUILE library with other files
  22  * to produce an executable, this does not by itself cause the
  23  * resulting executable to be covered by the GNU General Public License.
  24  * Your use of that executable is in no way restricted on account of
  25  * linking the GUILE library code into it.
  26  *
  27  * This exception does not however invalidate any other reasons why
  28  * the executable file might be covered by the GNU General Public License.
  29  *
  30  * This exception applies only to the code released by the
  31  * Free Software Foundation under the name GUILE.  If you copy
  32  * code from other Free Software Foundation releases into a copy of
  33  * GUILE, as the General Public License permits, the exception does
  34  * not apply to the code that you add in this way.  To avoid misleading
  35  * anyone as to the status of such modified files, you must delete
  36  * this exception notice from them.
  37  *
  38  * If you write modifications of your own for GUILE, it is your choice
  39  * whether to permit this exception to apply to your modifications.
  40  * If you do not wish that, delete this exception notice.  */
  41
  42 /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
  43    gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
  44
  45 \f
  46
  47 #include <stdio.h>
  48 #include "libguile/_scm.h"
  49 #include "libguile/ports.h"
  50 #include "libguile/root.h"
  51 #include "libguile/smob.h"
  52 #include "libguile/vectors.h"
  53
  54 #include "libguile/validate.h"
  55 #include "libguile/keywords.h"
  56 \f
  57
  58 static int
  59 prin_keyword (SCM exp,SCM port,scm_print_state *pstate)
  60 {
  61   scm_puts ("#:", port);
  62   scm_puts(1 + SCM_CHARS (SCM_CDR (exp)), port);
  63   return 1;
  64 }
  65
  66 int scm_tc16_keyword;
  67
  68
  69 SCM_DEFINE (scm_make_keyword_from_dash_symbol, "make-keyword-from-dash-symbol", 1, 0, 0,
  70             (SCM symbol),
  71             "Make a keyword object from a @var{symbol} that starts with a dash.")
  72 #define FUNC_NAME s_scm_make_keyword_from_dash_symbol
  73 {
  74   SCM vcell;
  75
  76   SCM_ASSERT (SCM_SYMBOLP (symbol)
  77               && ('-' == SCM_SYMBOL_CHARS(symbol)[0]),
  78               symbol, SCM_ARG1, FUNC_NAME);
  79
  80   SCM_DEFER_INTS;
  81   vcell = scm_sym2ovcell_soft (symbol, scm_keyword_obarray);
  82   if (SCM_FALSEP (vcell))
  83     {
  84       SCM keyword;
  85       SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol));
  86       scm_intern_symbol (scm_keyword_obarray, symbol);
  87       vcell = scm_sym2ovcell_soft (symbol, scm_keyword_obarray);
  88       SCM_SETCDR (vcell, keyword);
  89     }
  90   SCM_ALLOW_INTS;
  91   return SCM_CDR (vcell);
  92 }
  93 #undef FUNC_NAME
  94
  95 SCM
  96 scm_c_make_keyword (char *s)
  97 {
  98   SCM vcell;
  99   char *buf = scm_must_malloc (strlen (s) + 2, "keyword");
 100   buf[0] = '-';
 101   strcpy (buf + 1, s);
 102   vcell = scm_sysintern0 (buf);
 103   scm_must_free (buf);
 104   return scm_make_keyword_from_dash_symbol (SCM_CAR (vcell));
 105 }
 106
 107 SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0,
 108             (SCM obj),
 109             "Returns @code{#t} if the argument @var{obj} is a keyword, else @code{#f}.")
 110 #define FUNC_NAME s_scm_keyword_p
 111 {
 112   return SCM_BOOL(SCM_KEYWORDP (obj));
 113 }
 114 #undef FUNC_NAME
 115
 116
 117 SCM_DEFINE (scm_keyword_dash_symbol, "keyword-dash-symbol", 1, 0, 0,
 118             (SCM keyword),
 119             "Return the dash symbol for @var{keyword}.\n"
 120             "This is the inverse of @code{make-keyword-from-dash-symbol}.")
 121 #define FUNC_NAME s_scm_keyword_dash_symbol
 122 {
 123   SCM_VALIDATE_KEYWORD (1,keyword);
 124   return SCM_CDR (keyword);
 125 }
 126 #undef FUNC_NAME
 127
 128
 129
 130 void
 131 scm_init_keywords ()
 132 {
 133   scm_tc16_keyword = scm_make_smob_type_mfpe ("keyword", 0,
 134                                              scm_markcdr, NULL, prin_keyword, NULL);
 135
 136   scm_keyword_obarray = scm_make_vector (SCM_MAKINUM (256), SCM_EOL);
 137 #include "libguile/keywords.x"
 138 }
 139
 140
 141 /*
 142   Local Variables:
 143   c-file-style: "gnu"
 144   End:
 145 */