libguile/keywords.c

   1 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004 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
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16  */
  17
  18
  19 \f
  20
  21 #include <string.h>
  22
  23 #include "libguile/_scm.h"
  24 #include "libguile/ports.h"
  25 #include "libguile/root.h"
  26 #include "libguile/smob.h"
  27 #include "libguile/hashtab.h"
  28
  29 #include "libguile/validate.h"
  30 #include "libguile/keywords.h"
  31 #include "libguile/strings.h"
  32
  33 \f
  34
  35 scm_t_bits scm_tc16_keyword;
  36
  37 #define KEYWORDP(X)     (SCM_SMOB_PREDICATE (scm_tc16_keyword, (X)))
  38 #define KEYWORDSYM(X)   (SCM_SMOB_OBJECT (X))
  39
  40 static int
  41 keyword_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED)
  42 {
  43   scm_puts ("#:", port);
  44   scm_display (KEYWORDSYM (exp), port);
  45   return 1;
  46 }
  47
  48 SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0,
  49             (SCM obj),
  50             "Return @code{#t} if the argument @var{obj} is a keyword, else\n"
  51             "@code{#f}.")
  52 #define FUNC_NAME s_scm_keyword_p
  53 {
  54   return scm_from_bool (KEYWORDP (obj));
  55 }
  56 #undef FUNC_NAME
  57
  58 SCM_DEFINE (scm_symbol_to_keyword, "symbol->keyword", 1, 0, 0,
  59             (SCM symbol),
  60             "Return the keyword with the same name as @var{symbol}.")
  61 #define FUNC_NAME s_scm_symbol_to_keyword
  62 {
  63   SCM keyword;
  64
  65   SCM_ASSERT_TYPE (scm_is_symbol (symbol), symbol, 0, NULL, "symbol");
  66
  67   SCM_DEFER_INTS;
  68   keyword = scm_hashq_ref (scm_keyword_obarray, symbol, SCM_BOOL_F);
  69   if (scm_is_false (keyword))
  70     {
  71       SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol));
  72       scm_hashq_set_x (scm_keyword_obarray, symbol, keyword);
  73     }
  74   SCM_ALLOW_INTS;
  75   return keyword;
  76 }
  77 #undef FUNC_NAME
  78
  79 SCM_DEFINE (scm_keyword_to_symbol, "keyword->symbol", 1, 0, 0,
  80             (SCM keyword),
  81             "Return the symbol with the same name as @var{keyword}.")
  82 #define FUNC_NAME s_scm_keyword_to_symbol
  83 {
  84   scm_assert_smob_type (scm_tc16_keyword, keyword);
  85   return KEYWORDSYM (keyword);
  86 }
  87 #undef FUNC_NAME
  88
  89 int
  90 scm_is_keyword (SCM val)
  91 {
  92   return KEYWORDP (val);
  93 }
  94
  95 SCM
  96 scm_from_locale_keyword (const char *str)
  97 {
  98   return scm_symbol_to_keyword (scm_from_locale_symbol (str));
  99 }
 100
 101 SCM
 102 scm_from_locale_keywordn (const char *str, size_t len)
 103 {
 104   return scm_symbol_to_keyword (scm_from_locale_symboln (str, len));
 105 }
 106
 107
 108 void
 109 scm_init_keywords ()
 110 {
 111   scm_tc16_keyword = scm_make_smob_type ("keyword", 0);
 112   scm_set_smob_mark (scm_tc16_keyword, scm_markcdr);
 113   scm_set_smob_print (scm_tc16_keyword, keyword_print);
 114
 115   scm_keyword_obarray = scm_c_make_hash_table (0);
 116 #include "libguile/keywords.x"
 117 }
 118
 119
 120 /*
 121   Local Variables:
 122   c-file-style: "gnu"
 123   End:
 124 */