| 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 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 <string.h> |
| 48 | |
| 49 | #include "libguile/_scm.h" |
| 50 | #include "libguile/ports.h" |
| 51 | #include "libguile/root.h" |
| 52 | #include "libguile/smob.h" |
| 53 | #include "libguile/hashtab.h" |
| 54 | |
| 55 | #include "libguile/validate.h" |
| 56 | #include "libguile/keywords.h" |
| 57 | \f |
| 58 | |
| 59 | scm_bits_t scm_tc16_keyword; |
| 60 | |
| 61 | static int |
| 62 | keyword_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
| 63 | { |
| 64 | SCM symbol = SCM_KEYWORDSYM (exp); |
| 65 | |
| 66 | scm_puts ("#:", port); |
| 67 | scm_print_symbol_name (SCM_SYMBOL_CHARS (symbol) + 1, |
| 68 | SCM_SYMBOL_LENGTH (symbol) - 1, |
| 69 | port); |
| 70 | scm_remember_upto_here_1 (symbol); |
| 71 | return 1; |
| 72 | } |
| 73 | |
| 74 | SCM_DEFINE (scm_make_keyword_from_dash_symbol, "make-keyword-from-dash-symbol", 1, 0, 0, |
| 75 | (SCM symbol), |
| 76 | "Make a keyword object from a @var{symbol} that starts with a dash.") |
| 77 | #define FUNC_NAME s_scm_make_keyword_from_dash_symbol |
| 78 | { |
| 79 | SCM keyword; |
| 80 | |
| 81 | SCM_ASSERT (SCM_SYMBOLP (symbol) |
| 82 | && ('-' == SCM_SYMBOL_CHARS(symbol)[0]), |
| 83 | symbol, SCM_ARG1, FUNC_NAME); |
| 84 | |
| 85 | SCM_DEFER_INTS; |
| 86 | keyword = scm_hashq_ref (scm_keyword_obarray, symbol, SCM_BOOL_F); |
| 87 | if (SCM_FALSEP (keyword)) |
| 88 | { |
| 89 | SCM_NEWSMOB (keyword, scm_tc16_keyword, SCM_UNPACK (symbol)); |
| 90 | scm_hashq_set_x (scm_keyword_obarray, symbol, keyword); |
| 91 | } |
| 92 | SCM_ALLOW_INTS; |
| 93 | return keyword; |
| 94 | } |
| 95 | #undef FUNC_NAME |
| 96 | |
| 97 | SCM |
| 98 | scm_c_make_keyword (char *s) |
| 99 | { |
| 100 | char *buf = scm_must_malloc (strlen (s) + 2, "keyword"); |
| 101 | SCM symbol; |
| 102 | |
| 103 | buf[0] = '-'; |
| 104 | strcpy (buf + 1, s); |
| 105 | symbol = scm_str2symbol (buf); |
| 106 | scm_must_free (buf); |
| 107 | scm_done_free (strlen (s) + 2); |
| 108 | |
| 109 | return scm_make_keyword_from_dash_symbol (symbol); |
| 110 | } |
| 111 | |
| 112 | SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0, |
| 113 | (SCM obj), |
| 114 | "Return @code{#t} if the argument @var{obj} is a keyword, else\n" |
| 115 | "@code{#f}.") |
| 116 | #define FUNC_NAME s_scm_keyword_p |
| 117 | { |
| 118 | return SCM_BOOL (SCM_KEYWORDP (obj)); |
| 119 | } |
| 120 | #undef FUNC_NAME |
| 121 | |
| 122 | |
| 123 | SCM_DEFINE (scm_keyword_dash_symbol, "keyword-dash-symbol", 1, 0, 0, |
| 124 | (SCM keyword), |
| 125 | "Return the dash symbol for @var{keyword}.\n" |
| 126 | "This is the inverse of @code{make-keyword-from-dash-symbol}.") |
| 127 | #define FUNC_NAME s_scm_keyword_dash_symbol |
| 128 | { |
| 129 | SCM_VALIDATE_KEYWORD (1, keyword); |
| 130 | return SCM_KEYWORDSYM (keyword); |
| 131 | } |
| 132 | #undef FUNC_NAME |
| 133 | |
| 134 | |
| 135 | |
| 136 | void |
| 137 | scm_init_keywords () |
| 138 | { |
| 139 | scm_tc16_keyword = scm_make_smob_type ("keyword", 0); |
| 140 | scm_set_smob_mark (scm_tc16_keyword, scm_markcdr); |
| 141 | scm_set_smob_print (scm_tc16_keyword, keyword_print); |
| 142 | |
| 143 | scm_keyword_obarray = scm_c_make_hash_table (256); |
| 144 | #ifndef SCM_MAGIC_SNARFER |
| 145 | #include "libguile/keywords.x" |
| 146 | #endif |
| 147 | } |
| 148 | |
| 149 | |
| 150 | /* |
| 151 | Local Variables: |
| 152 | c-file-style: "gnu" |
| 153 | End: |
| 154 | */ |