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/async.h"
  25 #include "libguile/ports.h"
  26 #include "libguile/root.h"
  27 #include "libguile/smob.h"
  28 #include "libguile/hashtab.h"
  29
  30 #include "libguile/validate.h"
  31 #include "libguile/keywords.h"
  32 #include "libguile/strings.h"
  33
  34 \f
  35
  36 scm_t_bits scm_tc16_keyword;
  37
  38 #define KEYWORDP(X)     (SCM_SMOB_PREDICATE (scm_tc16_keyword, (X)))
  39 #define KEYWORDSYM(X)   (SCM_SMOB_OBJECT (X))
  40
  41 static int
  42 keyword_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED)
  43 {
  44   scm_puts ("#:", port);
  45   scm_display (KEYWORDSYM (exp), port);
  46   return 1;
  47 }
  48
  49 SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0,
  50             (SCM obj),
  51             "Return @code{#t} if the argument @var{obj} is a keyword, else\n"
  52             "@code{#f}.")
  53 #define FUNC_NAME s_scm_keyword_p
  54 {
  55   return scm_from_bool (KEYWORDP (obj));
  56 }
  57 #undef FUNC_NAME
  58
  59 SCM_DEFINE (scm_symbol_to_keyword, "symbol->keyword", 1, 0, 0,
  60             (SCM symbol),
  61             "Return the keyword with the same name as @var{symbol}.")
  62 #define FUNC_NAME s_scm_symbol_to_keyword
  63 {
  64   SCM keyword;
  65
  66   SCM_ASSERT_TYPE (scm_is_symbol (symbol), symbol, 0, NULL, "symbol");
  67
  68   SCM_CRITICAL_SECTION_START;
  69   keyword = scm_hashq_ref (scm_keyword_obarray, symbol, SCM_BOOL_F);
  70   if (scm_is_false (keyword))
  71     {
  72       SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol));
  73       scm_hashq_set_x (scm_keyword_obarray, symbol, keyword);
  74     }
  75   SCM_CRITICAL_SECTION_END;
  76   return keyword;
  77 }
  78 #undef FUNC_NAME
  79
  80 SCM_DEFINE (scm_keyword_to_symbol, "keyword->symbol", 1, 0, 0,
  81             (SCM keyword),
  82             "Return the symbol with the same name as @var{keyword}.")
  83 #define FUNC_NAME s_scm_keyword_to_symbol
  84 {
  85   scm_assert_smob_type (scm_tc16_keyword, keyword);
  86   return KEYWORDSYM (keyword);
  87 }
  88 #undef FUNC_NAME
  89
  90 int
  91 scm_is_keyword (SCM val)
  92 {
  93   return KEYWORDP (val);
  94 }
  95
  96 SCM
  97 scm_from_locale_keyword (const char *str)
  98 {
  99   return scm_symbol_to_keyword (scm_from_locale_symbol (str));
 100 }
 101
 102 SCM
 103 scm_from_locale_keywordn (const char *str, size_t len)
 104 {
 105   return scm_symbol_to_keyword (scm_from_locale_symboln (str, len));
 106 }
 107
 108
 109 void
 110 scm_init_keywords ()
 111 {
 112   scm_tc16_keyword = scm_make_smob_type ("keyword", 0);
 113   scm_set_smob_mark (scm_tc16_keyword, scm_markcdr);
 114   scm_set_smob_print (scm_tc16_keyword, keyword_print);
 115
 116   scm_keyword_obarray = scm_c_make_hash_table (0);
 117 #include "libguile/keywords.x"
 118 }
 119
 120
 121 /*
 122   Local Variables:
 123   c-file-style: "gnu"
 124   End:
 125 */