| 1 | /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, |
| 2 | * 2006, 2008, 2009, 2011, 2013, 2015 Free Software Foundation, Inc. |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public License |
| 6 | * as published by the Free Software Foundation; either version 3 of |
| 7 | * the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 17 | * 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | |
| 21 | \f |
| 22 | #ifdef HAVE_CONFIG_H |
| 23 | # include <config.h> |
| 24 | #endif |
| 25 | |
| 26 | #include <string.h> |
| 27 | #include <stdarg.h> |
| 28 | |
| 29 | #include "libguile/_scm.h" |
| 30 | #include "libguile/async.h" |
| 31 | #include "libguile/ports.h" |
| 32 | #include "libguile/root.h" |
| 33 | #include "libguile/smob.h" |
| 34 | #include "libguile/hashtab.h" |
| 35 | |
| 36 | #include "libguile/validate.h" |
| 37 | #include "libguile/keywords.h" |
| 38 | #include "libguile/strings.h" |
| 39 | |
| 40 | \f |
| 41 | |
| 42 | static SCM keyword_obarray; |
| 43 | |
| 44 | #define SCM_KEYWORDP(x) (SCM_HAS_TYP7 (x, scm_tc7_keyword)) |
| 45 | #define SCM_KEYWORD_SYMBOL(x) (SCM_CELL_OBJECT_1 (x)) |
| 46 | |
| 47 | SCM_DEFINE (scm_keyword_p, "keyword?", 1, 0, 0, |
| 48 | (SCM obj), |
| 49 | "Return @code{#t} if the argument @var{obj} is a keyword, else\n" |
| 50 | "@code{#f}.") |
| 51 | #define FUNC_NAME s_scm_keyword_p |
| 52 | { |
| 53 | return scm_from_bool (SCM_KEYWORDP (obj)); |
| 54 | } |
| 55 | #undef FUNC_NAME |
| 56 | |
| 57 | SCM_DEFINE (scm_symbol_to_keyword, "symbol->keyword", 1, 0, 0, |
| 58 | (SCM symbol), |
| 59 | "Return the keyword with the same name as @var{symbol}.") |
| 60 | #define FUNC_NAME s_scm_symbol_to_keyword |
| 61 | { |
| 62 | SCM keyword; |
| 63 | |
| 64 | SCM_ASSERT_TYPE (scm_is_symbol (symbol), symbol, 0, NULL, "symbol"); |
| 65 | |
| 66 | SCM_CRITICAL_SECTION_START; |
| 67 | /* Note: `scm_cell' and `scm_hashq_set_x' can raise an out-of-memory |
| 68 | error. */ |
| 69 | keyword = scm_hashq_ref (keyword_obarray, symbol, SCM_BOOL_F); |
| 70 | if (scm_is_false (keyword)) |
| 71 | { |
| 72 | keyword = scm_cell (scm_tc7_keyword, SCM_UNPACK (symbol)); |
| 73 | scm_hashq_set_x (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_VALIDATE_KEYWORD (1, keyword); |
| 86 | return SCM_KEYWORD_SYMBOL (keyword); |
| 87 | } |
| 88 | #undef FUNC_NAME |
| 89 | |
| 90 | int |
| 91 | scm_is_keyword (SCM val) |
| 92 | { |
| 93 | return SCM_KEYWORDP (val); |
| 94 | } |
| 95 | |
| 96 | SCM |
| 97 | scm_from_locale_keyword (const char *name) |
| 98 | { |
| 99 | return scm_symbol_to_keyword (scm_from_locale_symbol (name)); |
| 100 | } |
| 101 | |
| 102 | SCM |
| 103 | scm_from_locale_keywordn (const char *name, size_t len) |
| 104 | { |
| 105 | return scm_symbol_to_keyword (scm_from_locale_symboln (name, len)); |
| 106 | } |
| 107 | |
| 108 | SCM |
| 109 | scm_from_latin1_keyword (const char *name) |
| 110 | { |
| 111 | return scm_symbol_to_keyword (scm_from_latin1_symbol (name)); |
| 112 | } |
| 113 | |
| 114 | SCM |
| 115 | scm_from_utf8_keyword (const char *name) |
| 116 | { |
| 117 | return scm_symbol_to_keyword (scm_from_utf8_symbol (name)); |
| 118 | } |
| 119 | |
| 120 | SCM_SYMBOL (scm_keyword_argument_error, "keyword-argument-error"); |
| 121 | |
| 122 | void |
| 123 | scm_c_bind_keyword_arguments (const char *subr, SCM rest, |
| 124 | scm_t_keyword_arguments_flags flags, ...) |
| 125 | { |
| 126 | va_list va; |
| 127 | |
| 128 | if (SCM_UNLIKELY (!(flags & SCM_ALLOW_NON_KEYWORD_ARGUMENTS) |
| 129 | && scm_ilength (rest) % 2 != 0)) |
| 130 | scm_error (scm_keyword_argument_error, |
| 131 | subr, "Odd length of keyword argument list", |
| 132 | SCM_EOL, SCM_BOOL_F); |
| 133 | |
| 134 | while (scm_is_pair (rest)) |
| 135 | { |
| 136 | SCM kw_or_arg = SCM_CAR (rest); |
| 137 | SCM tail = SCM_CDR (rest); |
| 138 | |
| 139 | if (scm_is_keyword (kw_or_arg) && scm_is_pair (tail)) |
| 140 | { |
| 141 | SCM kw; |
| 142 | SCM *arg_p; |
| 143 | |
| 144 | va_start (va, flags); |
| 145 | for (;;) |
| 146 | { |
| 147 | kw = va_arg (va, SCM); |
| 148 | if (SCM_UNBNDP (kw)) |
| 149 | { |
| 150 | /* KW_OR_ARG is not in the list of expected keywords. */ |
| 151 | if (!(flags & SCM_ALLOW_OTHER_KEYS)) |
| 152 | scm_error_scm (scm_keyword_argument_error, |
| 153 | scm_from_locale_string (subr), |
| 154 | scm_from_latin1_string |
| 155 | ("Unrecognized keyword"), |
| 156 | SCM_EOL, scm_list_1 (kw_or_arg)); |
| 157 | break; |
| 158 | } |
| 159 | arg_p = va_arg (va, SCM *); |
| 160 | if (scm_is_eq (kw_or_arg, kw)) |
| 161 | { |
| 162 | /* We found the matching keyword. Store the |
| 163 | associated value and break out of the loop. */ |
| 164 | *arg_p = SCM_CAR (tail); |
| 165 | break; |
| 166 | } |
| 167 | } |
| 168 | va_end (va); |
| 169 | |
| 170 | /* Advance REST. */ |
| 171 | rest = SCM_CDR (tail); |
| 172 | } |
| 173 | else |
| 174 | { |
| 175 | /* The next argument is not a keyword, or is a singleton |
| 176 | keyword at the end of REST. */ |
| 177 | if (!(flags & SCM_ALLOW_NON_KEYWORD_ARGUMENTS)) |
| 178 | scm_error_scm (scm_keyword_argument_error, |
| 179 | scm_from_locale_string (subr), |
| 180 | scm_from_latin1_string ("Invalid keyword"), |
| 181 | SCM_EOL, scm_list_1 (kw_or_arg)); |
| 182 | |
| 183 | /* Advance REST. */ |
| 184 | rest = tail; |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | void |
| 190 | scm_init_keywords () |
| 191 | { |
| 192 | keyword_obarray = scm_c_make_hash_table (0); |
| 193 | #include "libguile/keywords.x" |
| 194 | } |
| 195 | |
| 196 | |
| 197 | /* |
| 198 | Local Variables: |
| 199 | c-file-style: "gnu" |
| 200 | End: |
| 201 | */ |