libguile/keywords.c

   1 /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004, 2006, 2008, 2009, 2011 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 License
   5  * as published by the Free Software Foundation; either version 3 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * 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
  16  * 02110-1301 USA
  17  */
  18
  19
  20 \f
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <string.h>
  26
  27 #include "libguile/_scm.h"
  28 #include "libguile/async.h"
  29 #include "libguile/ports.h"
  30 #include "libguile/root.h"
  31 #include "libguile/smob.h"
  32 #include "libguile/hashtab.h"
  33
  34 #include "libguile/validate.h"
  35 #include "libguile/keywords.h"
  36 #include "libguile/strings.h"
  37
  38 \f
  39
  40 static SCM keyword_obarray;
  41
  42 scm_t_bits scm_tc16_keyword;
  43
  44 #define KEYWORDP(X)     (SCM_SMOB_PREDICATE (scm_tc16_keyword, (X)))
  45 #define KEYWORDSYM(X)   (SCM_SMOB_OBJECT (X))
  46
  47 static int
  48 keyword_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED)
  49 {
  50   scm_puts_unlocked ("#:", port);
  51   scm_display (KEYWORDSYM (exp), port);
  52   return 1;
  53 }
  54
  55 SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0,
  56             (SCM obj),
  57             "Return @code{#t} if the argument @var{obj} is a keyword, else\n"
  58             "@code{#f}.")
  59 #define FUNC_NAME s_scm_keyword_p
  60 {
  61   return scm_from_bool (KEYWORDP (obj));
  62 }
  63 #undef FUNC_NAME
  64
  65 SCM_DEFINE (scm_symbol_to_keyword, "symbol->keyword", 1, 0, 0,
  66             (SCM symbol),
  67             "Return the keyword with the same name as @var{symbol}.")
  68 #define FUNC_NAME s_scm_symbol_to_keyword
  69 {
  70   SCM keyword;
  71
  72   SCM_ASSERT_TYPE (scm_is_symbol (symbol), symbol, 0, NULL, "symbol");
  73
  74   SCM_CRITICAL_SECTION_START;
  75   /* njrev: NEWSMOB and hashq_set_x can raise errors */
  76   keyword = scm_hashq_ref (keyword_obarray, symbol, SCM_BOOL_F);
  77   if (scm_is_false (keyword))
  78     {
  79       SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol));
  80       scm_hashq_set_x (keyword_obarray, symbol, keyword);
  81     }
  82   SCM_CRITICAL_SECTION_END;
  83   return keyword;
  84 }
  85 #undef FUNC_NAME
  86
  87 SCM_DEFINE (scm_keyword_to_symbol, "keyword->symbol", 1, 0, 0,
  88             (SCM keyword),
  89             "Return the symbol with the same name as @var{keyword}.")
  90 #define FUNC_NAME s_scm_keyword_to_symbol
  91 {
  92   scm_assert_smob_type (scm_tc16_keyword, keyword);
  93   return KEYWORDSYM (keyword);
  94 }
  95 #undef FUNC_NAME
  96
  97 int
  98 scm_is_keyword (SCM val)
  99 {
 100   return KEYWORDP (val);
 101 }
 102
 103 SCM
 104 scm_from_locale_keyword (const char *name)
 105 {
 106   return scm_symbol_to_keyword (scm_from_locale_symbol (name));
 107 }
 108
 109 SCM
 110 scm_from_locale_keywordn (const char *name, size_t len)
 111 {
 112   return scm_symbol_to_keyword (scm_from_locale_symboln (name, len));
 113 }
 114
 115 SCM
 116 scm_from_latin1_keyword (const char *name)
 117 {
 118   return scm_symbol_to_keyword (scm_from_latin1_symbol (name));
 119 }
 120
 121 SCM
 122 scm_from_utf8_keyword (const char *name)
 123 {
 124   return scm_symbol_to_keyword (scm_from_utf8_symbol (name));
 125 }
 126
 127 /* njrev: critical sections reviewed so far up to here */
 128 void
 129 scm_init_keywords ()
 130 {
 131   scm_tc16_keyword = scm_make_smob_type ("keyword", 0);
 132   scm_set_smob_print (scm_tc16_keyword, keyword_print);
 133
 134   keyword_obarray = scm_c_make_hash_table (0);
 135 #include "libguile/keywords.x"
 136 }
 137
 138
 139 /*
 140   Local Variables:
 141   c-file-style: "gnu"
 142   End:
 143 */