libguile/keywords.c

   1 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004, 2006, 2008 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  16  */
  17
  18
  19 \f
  20 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <string.h>
  25
  26 #include "libguile/_scm.h"
  27 #include "libguile/async.h"
  28 #include "libguile/ports.h"
  29 #include "libguile/root.h"
  30 #include "libguile/smob.h"
  31 #include "libguile/hashtab.h"
  32
  33 #include "libguile/validate.h"
  34 #include "libguile/keywords.h"
  35 #include "libguile/strings.h"
  36
  37 \f
  38
  39 scm_t_bits scm_tc16_keyword;
  40
  41 #define KEYWORDP(X)     (SCM_SMOB_PREDICATE (scm_tc16_keyword, (X)))
  42 #define KEYWORDSYM(X)   (SCM_SMOB_OBJECT (X))
  43
  44 static int
  45 keyword_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED)
  46 {
  47   scm_puts ("#:", port);
  48   scm_display (KEYWORDSYM (exp), port);
  49   return 1;
  50 }
  51
  52 SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0,
  53             (SCM obj),
  54             "Return @code{#t} if the argument @var{obj} is a keyword, else\n"
  55             "@code{#f}.")
  56 #define FUNC_NAME s_scm_keyword_p
  57 {
  58   return scm_from_bool (KEYWORDP (obj));
  59 }
  60 #undef FUNC_NAME
  61
  62 SCM_DEFINE (scm_symbol_to_keyword, "symbol->keyword", 1, 0, 0,
  63             (SCM symbol),
  64             "Return the keyword with the same name as @var{symbol}.")
  65 #define FUNC_NAME s_scm_symbol_to_keyword
  66 {
  67   SCM keyword;
  68
  69   SCM_ASSERT_TYPE (scm_is_symbol (symbol), symbol, 0, NULL, "symbol");
  70
  71   SCM_CRITICAL_SECTION_START;
  72   /* njrev: NEWSMOB and hashq_set_x can raise errors */
  73   keyword = scm_hashq_ref (scm_keyword_obarray, symbol, SCM_BOOL_F);
  74   if (scm_is_false (keyword))
  75     {
  76       SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol));
  77       scm_hashq_set_x (scm_keyword_obarray, symbol, keyword);
  78     }
  79   SCM_CRITICAL_SECTION_END;
  80   return keyword;
  81 }
  82 #undef FUNC_NAME
  83
  84 SCM_DEFINE (scm_keyword_to_symbol, "keyword->symbol", 1, 0, 0,
  85             (SCM keyword),
  86             "Return the symbol with the same name as @var{keyword}.")
  87 #define FUNC_NAME s_scm_keyword_to_symbol
  88 {
  89   scm_assert_smob_type (scm_tc16_keyword, keyword);
  90   return KEYWORDSYM (keyword);
  91 }
  92 #undef FUNC_NAME
  93
  94 int
  95 scm_is_keyword (SCM val)
  96 {
  97   return KEYWORDP (val);
  98 }
  99
 100 SCM
 101 scm_from_locale_keyword (const char *str)
 102 {
 103   return scm_symbol_to_keyword (scm_from_locale_symbol (str));
 104 }
 105
 106 SCM
 107 scm_from_locale_keywordn (const char *str, size_t len)
 108 {
 109   return scm_symbol_to_keyword (scm_from_locale_symboln (str, len));
 110 }
 111
 112 /* njrev: critical sections reviewed so far up to here */
 113 void
 114 scm_init_keywords ()
 115 {
 116   scm_tc16_keyword = scm_make_smob_type ("keyword", 0);
 117   scm_set_smob_mark (scm_tc16_keyword, scm_markcdr);
 118   scm_set_smob_print (scm_tc16_keyword, keyword_print);
 119
 120   scm_keyword_obarray = scm_c_make_hash_table (0);
 121 #include "libguile/keywords.x"
 122 }
 123
 124
 125 /*
 126   Local Variables:
 127   c-file-style: "gnu"
 128   End:
 129 */