libguile/keywords.c

   1 /* Copyright (C) 1995,1996,1997,1998, 1999 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 /* This global is only kept for backward compatibility.
  69    Will be removed in next release.  */
  70 int scm_tc16_kw;
  71
  72
  73 SCM_DEFINE (scm_make_keyword_from_dash_symbol, "make-keyword-from-dash-symbol", 1, 0, 0,
  74             (SCM symbol),
  75             "Return a keyword object from SYMBOL that starts with `-' (a dash).")
  76 #define FUNC_NAME s_scm_make_keyword_from_dash_symbol
  77 {
  78   SCM vcell;
  79
  80   SCM_ASSERT (SCM_SYMBOLP (symbol)
  81               && ('-' == SCM_CHARS(symbol)[0]),
  82               symbol, SCM_ARG1, FUNC_NAME);
  83
  84   SCM_DEFER_INTS;
  85   vcell = scm_sym2ovcell_soft (symbol, scm_keyword_obarray);
  86   if (SCM_FALSEP (vcell))
  87     {
  88       SCM keyword;
  89       SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol));
  90       scm_intern_symbol (scm_keyword_obarray, symbol);
  91       vcell = scm_sym2ovcell_soft (symbol, scm_keyword_obarray);
  92       SCM_SETCDR (vcell, keyword);
  93     }
  94   SCM_ALLOW_INTS;
  95   return SCM_CDR (vcell);
  96 }
  97 #undef FUNC_NAME
  98
  99 SCM
 100 scm_c_make_keyword (char *s)
 101 {
 102   SCM vcell;
 103   char *buf = scm_must_malloc (strlen (s) + 2, "keyword");
 104   buf[0] = '-';
 105   strcpy (buf + 1, s);
 106   vcell = scm_sysintern0 (buf);
 107   scm_must_free (buf);
 108   return scm_make_keyword_from_dash_symbol (SCM_CAR (vcell));
 109 }
 110
 111 SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0,
 112             (SCM obj),
 113             "Returns #t if the argument OBJ is a keyword, else #f.")
 114 #define FUNC_NAME s_scm_keyword_p
 115 {
 116   return SCM_BOOL(SCM_KEYWORDP (obj));
 117 }
 118 #undef FUNC_NAME
 119
 120
 121 SCM_DEFINE (scm_keyword_dash_symbol, "keyword-dash-symbol", 1, 0, 0,
 122             (SCM keyword),
 123             "Return KEYWORD as a dash symbol.\n"
 124             "This is the inverse of `make-keyword-from-dash-symbol'.\n")
 125 #define FUNC_NAME s_scm_keyword_dash_symbol
 126 {
 127   SCM_VALIDATE_KEYWORD (1,keyword);
 128   return SCM_CDR (keyword);
 129 }
 130 #undef FUNC_NAME
 131
 132
 133
 134 void
 135 scm_init_keywords ()
 136 {
 137   scm_tc16_keyword = scm_make_smob_type_mfpe ("keyword", 0,
 138                                              scm_markcdr, NULL, prin_keyword, NULL);
 139   scm_tc16_kw = scm_tc16_keyword;
 140   scm_keyword_obarray = scm_make_vector (SCM_MAKINUM (256), SCM_EOL);
 141 #include "libguile/keywords.x"
 142 }
 143
 144
 145 /*
 146   Local Variables:
 147   c-file-style: "gnu"
 148   End:
 149 */