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726d810a | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc. |
99027e3c MD |
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 | ||
a0599745 | 47 | #include "libguile/_scm.h" |
726d810a DH |
48 | #include "libguile/alist.h" /* for SCM_EXTEND_ENV (well...) */ |
49 | #include "libguile/eval.h" | |
50 | #include "libguile/ports.h" | |
51 | #include "libguile/print.h" | |
a0599745 MD |
52 | #include "libguile/root.h" |
53 | #include "libguile/smob.h" | |
99027e3c | 54 | |
a0599745 MD |
55 | #include "libguile/validate.h" |
56 | #include "libguile/macros.h" | |
99027e3c | 57 | |
92c2555f | 58 | scm_t_bits scm_tc16_macro; |
99027e3c | 59 | |
726d810a DH |
60 | |
61 | static int | |
62 | macro_print (SCM macro, SCM port, scm_print_state *pstate) | |
63 | { | |
64 | SCM code = SCM_MACRO_CODE (macro); | |
65 | if (!SCM_CLOSUREP (code) | |
66 | || SCM_FALSEP (scm_procedure_p (SCM_PRINT_CLOSURE)) | |
67 | || SCM_FALSEP (scm_printer_apply (SCM_PRINT_CLOSURE, | |
68 | macro, port, pstate))) | |
69 | { | |
70 | if (!SCM_CLOSUREP (code)) | |
71 | scm_puts ("#<primitive-", port); | |
72 | else | |
73 | scm_puts ("#<", port); | |
74 | ||
75 | if (SCM_MACRO_TYPE (macro) == 0) | |
76 | scm_puts ("syntax", port); | |
77 | else if (SCM_MACRO_TYPE (macro) == 1) | |
78 | scm_puts ("macro", port); | |
79 | if (SCM_MACRO_TYPE (macro) == 2) | |
80 | scm_puts ("macro!", port); | |
81 | scm_putc (' ', port); | |
82 | scm_iprin1 (scm_macro_name (macro), port, pstate); | |
83 | ||
84 | if (SCM_CLOSUREP (code) && SCM_PRINT_SOURCE_P) | |
85 | { | |
86 | SCM formals = SCM_CLOSURE_FORMALS (code); | |
87 | SCM env = SCM_ENV (code); | |
88 | SCM xenv = SCM_EXTEND_ENV (formals, SCM_EOL, env); | |
89 | SCM src = scm_unmemocopy (SCM_CODE (code), xenv); | |
90 | scm_putc (' ', port); | |
91 | scm_iprin1 (src, port, pstate); | |
92 | } | |
93 | ||
94 | scm_putc ('>', port); | |
95 | } | |
96 | ||
97 | return 1; | |
98 | } | |
99 | ||
100 | ||
a1ec6916 | 101 | SCM_DEFINE (scm_makacro, "procedure->syntax", 1, 0, 0, |
1bbd0b84 | 102 | (SCM code), |
1e6808ea MG |
103 | "Return a @dfn{macro} which, when a symbol defined to this value\n" |
104 | "appears as the first symbol in an expression, returns the\n" | |
105 | "result of applying @var{code} to the expression and the\n" | |
106 | "environment.") | |
1bbd0b84 | 107 | #define FUNC_NAME s_scm_makacro |
99027e3c | 108 | { |
3b3b36dd | 109 | SCM_VALIDATE_PROC (1,code); |
54778cd3 | 110 | SCM_RETURN_NEWSMOB (scm_tc16_macro, SCM_UNPACK (code)); |
99027e3c | 111 | } |
1bbd0b84 | 112 | #undef FUNC_NAME |
99027e3c MD |
113 | |
114 | ||
3b3b36dd | 115 | SCM_DEFINE (scm_makmacro, "procedure->macro", 1, 0, 0, |
1bbd0b84 | 116 | (SCM code), |
1e6808ea MG |
117 | "Return a @dfn{macro} which, when a symbol defined to this value\n" |
118 | "appears as the first symbol in an expression, evaluates the\n" | |
119 | "result of applying @var{code} to the expression and the\n" | |
120 | "environment. The value returned from @var{code} which has been\n" | |
121 | "passed to @code{procedure->memoizing-macro} replaces the form\n" | |
122 | "passed to @var{code}. For example:\n" | |
123 | "\n" | |
124 | "@lisp\n" | |
872e0c72 NJ |
125 | "(define trace\n" |
126 | " (procedure->macro\n" | |
127 | " (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n" | |
128 | "(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n" | |
1e6808ea | 129 | "@end lisp") |
1bbd0b84 | 130 | #define FUNC_NAME s_scm_makmacro |
99027e3c | 131 | { |
3b3b36dd | 132 | SCM_VALIDATE_PROC (1,code); |
54778cd3 | 133 | SCM_RETURN_NEWSMOB (scm_tc16_macro | (1L << 16), SCM_UNPACK (code)); |
99027e3c | 134 | } |
1bbd0b84 | 135 | #undef FUNC_NAME |
99027e3c MD |
136 | |
137 | ||
3b3b36dd | 138 | SCM_DEFINE (scm_makmmacro, "procedure->memoizing-macro", 1, 0, 0, |
1bbd0b84 | 139 | (SCM code), |
1e6808ea MG |
140 | "Return a @dfn{macro} which, when a symbol defined to this value\n" |
141 | "appears as the first symbol in an expression, evaluates the\n" | |
142 | "result of applying @var{proc} to the expression and the\n" | |
143 | "environment. The value returned from @var{proc} which has been\n" | |
144 | "passed to @code{procedure->memoizing-macro} replaces the form\n" | |
145 | "passed to @var{proc}. For example:\n" | |
146 | "\n" | |
147 | "@lisp\n" | |
148 | "(define trace\n" | |
149 | " (procedure->macro\n" | |
150 | " (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n" | |
151 | "(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n" | |
152 | "@end lisp") | |
1bbd0b84 | 153 | #define FUNC_NAME s_scm_makmmacro |
99027e3c | 154 | { |
3b3b36dd | 155 | SCM_VALIDATE_PROC (1,code); |
54778cd3 | 156 | SCM_RETURN_NEWSMOB (scm_tc16_macro | (2L << 16), SCM_UNPACK (code)); |
99027e3c | 157 | } |
1bbd0b84 | 158 | #undef FUNC_NAME |
99027e3c MD |
159 | |
160 | ||
a1ec6916 | 161 | SCM_DEFINE (scm_macro_p, "macro?", 1, 0, 0, |
1bbd0b84 | 162 | (SCM obj), |
b380b885 MD |
163 | "Return @code{#t} if @var{obj} is a regular macro, a memoizing macro or a\n" |
164 | "syntax transformer.") | |
1bbd0b84 | 165 | #define FUNC_NAME s_scm_macro_p |
99027e3c | 166 | { |
e841c3e0 | 167 | return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_macro, obj)); |
99027e3c | 168 | } |
1bbd0b84 | 169 | #undef FUNC_NAME |
99027e3c MD |
170 | |
171 | ||
172 | SCM_SYMBOL (scm_sym_syntax, "syntax"); | |
173 | SCM_SYMBOL (scm_sym_macro, "macro"); | |
174 | SCM_SYMBOL (scm_sym_mmacro, "macro!"); | |
175 | ||
a1ec6916 | 176 | SCM_DEFINE (scm_macro_type, "macro-type", 1, 0, 0, |
1bbd0b84 | 177 | (SCM m), |
1e6808ea MG |
178 | "Return one of the symbols @code{syntax}, @code{macro} or\n" |
179 | "@code{macro!}, depending on whether @var{m} is a syntax\n" | |
180 | "tranformer, a regular macro, or a memoizing macro,\n" | |
181 | "respectively. If @var{m} is not a macro, @code{#f} is\n" | |
182 | "returned.") | |
1bbd0b84 | 183 | #define FUNC_NAME s_scm_macro_type |
99027e3c | 184 | { |
e841c3e0 | 185 | if (!SCM_TYP16_PREDICATE (scm_tc16_macro, m)) |
99027e3c | 186 | return SCM_BOOL_F; |
726d810a | 187 | switch (SCM_MACRO_TYPE (m)) |
99027e3c MD |
188 | { |
189 | case 0: return scm_sym_syntax; | |
190 | case 1: return scm_sym_macro; | |
191 | case 2: return scm_sym_mmacro; | |
1bbd0b84 | 192 | default: scm_wrong_type_arg (FUNC_NAME, 1, m); |
99027e3c MD |
193 | } |
194 | } | |
1bbd0b84 | 195 | #undef FUNC_NAME |
99027e3c MD |
196 | |
197 | ||
a1ec6916 | 198 | SCM_DEFINE (scm_macro_name, "macro-name", 1, 0, 0, |
1bbd0b84 | 199 | (SCM m), |
88c927e9 | 200 | "Return the name of the macro @var{m}.") |
1bbd0b84 | 201 | #define FUNC_NAME s_scm_macro_name |
99027e3c | 202 | { |
3b3b36dd | 203 | SCM_VALIDATE_SMOB (1,m,macro); |
88c927e9 | 204 | return scm_procedure_name (SCM_PACK (SCM_SMOB_DATA (m))); |
99027e3c | 205 | } |
1bbd0b84 | 206 | #undef FUNC_NAME |
99027e3c MD |
207 | |
208 | ||
a1ec6916 | 209 | SCM_DEFINE (scm_macro_transformer, "macro-transformer", 1, 0, 0, |
1bbd0b84 | 210 | (SCM m), |
88c927e9 | 211 | "Return the transformer of the macro @var{m}.") |
1bbd0b84 | 212 | #define FUNC_NAME s_scm_macro_transformer |
99027e3c | 213 | { |
3b3b36dd | 214 | SCM_VALIDATE_SMOB (1,m,macro); |
88c927e9 MV |
215 | return ((SCM_CLOSUREP (SCM_PACK (SCM_SMOB_DATA (m)))) ? |
216 | SCM_PACK(SCM_SMOB_DATA (m)) : SCM_BOOL_F); | |
99027e3c | 217 | } |
1bbd0b84 | 218 | #undef FUNC_NAME |
99027e3c MD |
219 | |
220 | SCM | |
1bbd0b84 | 221 | scm_make_synt (const char *name, SCM (*macroizer) (), SCM (*fcn)() ) |
99027e3c | 222 | { |
86d31dfe | 223 | SCM var = scm_c_define (name, SCM_UNDEFINED); |
9a441ddb | 224 | SCM transformer = scm_c_make_subr (name, scm_tc7_subr_2, fcn); |
86d31dfe MV |
225 | SCM_VARIABLE_SET (var, macroizer (transformer)); |
226 | return SCM_UNSPECIFIED; | |
99027e3c MD |
227 | } |
228 | ||
229 | void | |
230 | scm_init_macros () | |
231 | { | |
e841c3e0 KN |
232 | scm_tc16_macro = scm_make_smob_type ("macro", 0); |
233 | scm_set_smob_mark (scm_tc16_macro, scm_markcdr); | |
726d810a | 234 | scm_set_smob_print (scm_tc16_macro, macro_print); |
8dc9439f | 235 | #ifndef SCM_MAGIC_SNARFER |
a0599745 | 236 | #include "libguile/macros.x" |
8dc9439f | 237 | #endif |
99027e3c | 238 | } |
89e00824 ML |
239 | |
240 | /* | |
241 | Local Variables: | |
242 | c-file-style: "gnu" | |
243 | End: | |
244 | */ |