Commit | Line | Data |
---|---|---|
99027e3c MD |
1 | /* Copyright (C) 1995,1996,1997,1998 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. */ | |
1bbd0b84 GB |
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 | ||
99027e3c MD |
45 | \f |
46 | ||
47 | #include "_scm.h" | |
ba11fd4c | 48 | #include "root.h" |
99027e3c MD |
49 | #include "smob.h" |
50 | ||
b6791b2e | 51 | #include "validate.h" |
99027e3c MD |
52 | #include "macros.h" |
53 | ||
54 | long scm_tc16_macro; | |
55 | ||
a1ec6916 | 56 | SCM_DEFINE (scm_makacro, "procedure->syntax", 1, 0, 0, |
1bbd0b84 | 57 | (SCM code), |
07f7f249 GB |
58 | "Returns a @dfn{macro} which, when a symbol defined to this value\n" |
59 | "appears as the first symbol in an expression, returns the result\n" | |
60 | "of applying @var{code} to the expression and the environment.") | |
1bbd0b84 | 61 | #define FUNC_NAME s_scm_makacro |
99027e3c | 62 | { |
3b3b36dd | 63 | SCM_VALIDATE_PROC (1,code); |
54778cd3 | 64 | SCM_RETURN_NEWSMOB (scm_tc16_macro, SCM_UNPACK (code)); |
99027e3c | 65 | } |
1bbd0b84 | 66 | #undef FUNC_NAME |
99027e3c MD |
67 | |
68 | ||
3b3b36dd | 69 | SCM_DEFINE (scm_makmacro, "procedure->macro", 1, 0, 0, |
1bbd0b84 | 70 | (SCM code), |
07f7f249 GB |
71 | "Returns a @dfn{macro} which, when a symbol defined to this value\n" |
72 | "appears as the first symbol in an expression, evaluates the result\n" | |
73 | "of applying @var{code} to the expression and the environment.\n" | |
74 | "The value returned from @var{code} which has been passed to\n" | |
75 | "@code{procedure->memoizing-macro} replaces the form passed to\n" | |
76 | "@var{code}. For example:\n\n" | |
77 | "@example\n" | |
78 | "(define trace\n" | |
79 | " (procedure->macro\n" | |
80 | " (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n" | |
81 | "(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n" | |
82 | "@end example\n") | |
1bbd0b84 | 83 | #define FUNC_NAME s_scm_makmacro |
99027e3c | 84 | { |
3b3b36dd | 85 | SCM_VALIDATE_PROC (1,code); |
54778cd3 | 86 | SCM_RETURN_NEWSMOB (scm_tc16_macro | (1L << 16), SCM_UNPACK (code)); |
99027e3c | 87 | } |
1bbd0b84 | 88 | #undef FUNC_NAME |
99027e3c MD |
89 | |
90 | ||
3b3b36dd | 91 | SCM_DEFINE (scm_makmmacro, "procedure->memoizing-macro", 1, 0, 0, |
1bbd0b84 | 92 | (SCM code), |
07f7f249 GB |
93 | "Returns a @dfn{macro} which, when a symbol defined to this value\n" |
94 | "appears as the first symbol in an expression, evaluates the result\n" | |
95 | "of applying @var{proc} to the expression and the environment.\n" | |
96 | "The value returned from @var{proc} which has been passed to\n" | |
97 | "@code{procedure->memoizing-macro} replaces the form passed to\n" | |
98 | "@var{proc}. For example:\n\n" | |
99 | "@example\n" | |
100 | "(define trace\n" | |
101 | " (procedure->macro\n" | |
102 | " (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n" | |
103 | "(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n" | |
104 | "@end example\n") | |
1bbd0b84 | 105 | #define FUNC_NAME s_scm_makmmacro |
99027e3c | 106 | { |
3b3b36dd | 107 | SCM_VALIDATE_PROC (1,code); |
54778cd3 | 108 | SCM_RETURN_NEWSMOB (scm_tc16_macro | (2L << 16), SCM_UNPACK (code)); |
99027e3c | 109 | } |
1bbd0b84 | 110 | #undef FUNC_NAME |
99027e3c MD |
111 | |
112 | ||
a1ec6916 | 113 | SCM_DEFINE (scm_macro_p, "macro?", 1, 0, 0, |
1bbd0b84 | 114 | (SCM obj), |
b380b885 MD |
115 | "Return @code{#t} if @var{obj} is a regular macro, a memoizing macro or a\n" |
116 | "syntax transformer.") | |
1bbd0b84 | 117 | #define FUNC_NAME s_scm_macro_p |
99027e3c | 118 | { |
1bbd0b84 | 119 | return SCM_BOOL(SCM_NIMP (obj) && SCM_TYP16 (obj) == scm_tc16_macro); |
99027e3c | 120 | } |
1bbd0b84 | 121 | #undef FUNC_NAME |
99027e3c MD |
122 | |
123 | ||
124 | SCM_SYMBOL (scm_sym_syntax, "syntax"); | |
125 | SCM_SYMBOL (scm_sym_macro, "macro"); | |
126 | SCM_SYMBOL (scm_sym_mmacro, "macro!"); | |
127 | ||
a1ec6916 | 128 | SCM_DEFINE (scm_macro_type, "macro-type", 1, 0, 0, |
1bbd0b84 | 129 | (SCM m), |
b380b885 MD |
130 | "Return one of the symbols @code{syntax}, @code{macro} or @code{macro!},\n" |
131 | "depending on whether @var{obj} is a syntax tranformer, a regular macro,\n" | |
132 | "or a memoizing macro, respectively. If @var{obj} is not a macro,\n" | |
133 | "@code{#f} is returned.") | |
1bbd0b84 | 134 | #define FUNC_NAME s_scm_macro_type |
99027e3c MD |
135 | { |
136 | if (!(SCM_NIMP (m) && SCM_TYP16 (m) == scm_tc16_macro)) | |
137 | return SCM_BOOL_F; | |
f1267706 | 138 | switch ((int) (SCM_UNPACK_CAR (m) >> 16)) |
99027e3c MD |
139 | { |
140 | case 0: return scm_sym_syntax; | |
141 | case 1: return scm_sym_macro; | |
142 | case 2: return scm_sym_mmacro; | |
1bbd0b84 | 143 | default: scm_wrong_type_arg (FUNC_NAME, 1, m); |
99027e3c MD |
144 | } |
145 | } | |
1bbd0b84 | 146 | #undef FUNC_NAME |
99027e3c MD |
147 | |
148 | ||
a1ec6916 | 149 | SCM_DEFINE (scm_macro_name, "macro-name", 1, 0, 0, |
1bbd0b84 | 150 | (SCM m), |
b380b885 | 151 | "") |
1bbd0b84 | 152 | #define FUNC_NAME s_scm_macro_name |
99027e3c | 153 | { |
3b3b36dd | 154 | SCM_VALIDATE_SMOB (1,m,macro); |
99027e3c MD |
155 | return scm_procedure_name (SCM_CDR (m)); |
156 | } | |
1bbd0b84 | 157 | #undef FUNC_NAME |
99027e3c MD |
158 | |
159 | ||
a1ec6916 | 160 | SCM_DEFINE (scm_macro_transformer, "macro-transformer", 1, 0, 0, |
1bbd0b84 | 161 | (SCM m), |
b380b885 | 162 | "") |
1bbd0b84 | 163 | #define FUNC_NAME s_scm_macro_transformer |
99027e3c | 164 | { |
3b3b36dd | 165 | SCM_VALIDATE_SMOB (1,m,macro); |
99027e3c MD |
166 | return SCM_CLOSUREP (SCM_CDR (m)) ? SCM_CDR (m) : SCM_BOOL_F; |
167 | } | |
1bbd0b84 | 168 | #undef FUNC_NAME |
99027e3c MD |
169 | |
170 | SCM | |
1bbd0b84 | 171 | scm_make_synt (const char *name, SCM (*macroizer) (), SCM (*fcn)() ) |
99027e3c MD |
172 | { |
173 | SCM symcell = scm_sysintern (name, SCM_UNDEFINED); | |
26cfa3be MD |
174 | SCM transformer = scm_make_subr_opt (name, scm_tc7_subr_2, fcn, 0); |
175 | SCM_SETCDR (symcell, macroizer (transformer)); | |
99027e3c MD |
176 | return SCM_CAR (symcell); |
177 | } | |
178 | ||
179 | void | |
180 | scm_init_macros () | |
181 | { | |
23a62151 MD |
182 | scm_tc16_macro = scm_make_smob_type_mfpe ("macro", 0, |
183 | scm_markcdr, NULL, NULL, NULL); | |
99027e3c MD |
184 | #include "macros.x" |
185 | } | |
89e00824 ML |
186 | |
187 | /* | |
188 | Local Variables: | |
189 | c-file-style: "gnu" | |
190 | End: | |
191 | */ |