| 1 | /* Copyright (C) 1995, 1996, 2000, 2001, 2006, 2008, 2009, 2010, 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 "libguile/_scm.h" |
| 26 | |
| 27 | #include "libguile/validate.h" |
| 28 | #include "libguile/boolean.h" |
| 29 | #include "libguile/tags.h" |
| 30 | |
| 31 | #include "verify.h" |
| 32 | |
| 33 | \f |
| 34 | |
| 35 | /* |
| 36 | * These compile-time tests verify the properties needed for the |
| 37 | * efficient test macros defined in boolean.h, which are defined in |
| 38 | * terms of the SCM_MATCHES_BITS_IN_COMMON macro. |
| 39 | * |
| 40 | * See the comments preceeding the definitions of SCM_BOOL_F and |
| 41 | * SCM_MATCHES_BITS_IN_COMMON in tags.h for more information. |
| 42 | */ |
| 43 | verify (SCM_BITS_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \ |
| 44 | (SCM_BOOL_F_BITS, SCM_BOOL_T_BITS)); |
| 45 | verify (SCM_BITS_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \ |
| 46 | (SCM_ELISP_NIL_BITS, SCM_BOOL_F_BITS)); |
| 47 | verify (SCM_BITS_DIFFER_IN_EXACTLY_ONE_BIT_POSITION \ |
| 48 | (SCM_ELISP_NIL_BITS, SCM_EOL_BITS)); |
| 49 | verify (SCM_BITS_DIFFER_IN_EXACTLY_TWO_BIT_POSITIONS \ |
| 50 | (SCM_ELISP_NIL_BITS, SCM_BOOL_F_BITS, SCM_BOOL_T_BITS, \ |
| 51 | SCM_XXX_ANOTHER_BOOLEAN_DONT_USE_0)); |
| 52 | verify (SCM_BITS_DIFFER_IN_EXACTLY_TWO_BIT_POSITIONS \ |
| 53 | (SCM_ELISP_NIL_BITS, SCM_BOOL_F_BITS, SCM_EOL_BITS, \ |
| 54 | SCM_XXX_ANOTHER_LISP_FALSE_DONT_USE)); |
| 55 | |
| 56 | SCM_DEFINE (scm_not, "not", 1, 0, 0, |
| 57 | (SCM x), |
| 58 | "Return @code{#t} iff @var{x} is false, else return @code{#f}.") |
| 59 | #define FUNC_NAME s_scm_not |
| 60 | { |
| 61 | return scm_from_bool (scm_is_false (x)); |
| 62 | } |
| 63 | #undef FUNC_NAME |
| 64 | |
| 65 | SCM_DEFINE (scm_nil_p, "nil?", 1, 0, 0, |
| 66 | (SCM x), |
| 67 | "Return @code{#t} iff @var{x} is nil, else return @code{#f}.") |
| 68 | #define FUNC_NAME s_scm_nil_p |
| 69 | { |
| 70 | return scm_from_bool (scm_is_lisp_false (x)); |
| 71 | } |
| 72 | #undef FUNC_NAME |
| 73 | |
| 74 | SCM_DEFINE (scm_boolean_p, "boolean?", 1, 0, 0, |
| 75 | (SCM obj), |
| 76 | "Return @code{#t} iff @var{obj} is @code{#t} or false.") |
| 77 | #define FUNC_NAME s_scm_boolean_p |
| 78 | { |
| 79 | return scm_from_bool (scm_is_bool (obj)); |
| 80 | } |
| 81 | #undef FUNC_NAME |
| 82 | |
| 83 | int |
| 84 | scm_to_bool (SCM x) |
| 85 | { |
| 86 | if (scm_is_false (x)) |
| 87 | return 0; |
| 88 | else if (scm_is_eq (x, SCM_BOOL_T)) |
| 89 | return 1; |
| 90 | else |
| 91 | scm_wrong_type_arg (NULL, 0, x); |
| 92 | } |
| 93 | |
| 94 | /* We keep this primitive as a function in addition to the same-named macro |
| 95 | because some applications (e.g., GNU LilyPond 2.13.9) expect it to be a |
| 96 | function. */ |
| 97 | #undef scm_is_bool |
| 98 | int |
| 99 | scm_is_bool (SCM obj) |
| 100 | { |
| 101 | /* This must match the macro definition of `scm_is_bool ()'. */ |
| 102 | return scm_is_bool_or_nil (obj); |
| 103 | } |
| 104 | |
| 105 | \f |
| 106 | void |
| 107 | scm_init_boolean () |
| 108 | { |
| 109 | #include "libguile/boolean.x" |
| 110 | } |
| 111 | |
| 112 | |
| 113 | /* |
| 114 | Local Variables: |
| 115 | c-file-style: "gnu" |
| 116 | End: |
| 117 | */ |