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" | |
48 | #include "smob.h" | |
49 | ||
b6791b2e | 50 | #include "validate.h" |
99027e3c MD |
51 | #include "macros.h" |
52 | ||
53 | long scm_tc16_macro; | |
54 | ||
a1ec6916 | 55 | SCM_DEFINE (scm_makacro, "procedure->syntax", 1, 0, 0, |
1bbd0b84 | 56 | (SCM code), |
07f7f249 GB |
57 | "Returns a @dfn{macro} which, when a symbol defined to this value\n" |
58 | "appears as the first symbol in an expression, returns the result\n" | |
59 | "of applying @var{code} to the expression and the environment.") | |
1bbd0b84 | 60 | #define FUNC_NAME s_scm_makacro |
99027e3c | 61 | { |
3b3b36dd | 62 | SCM_VALIDATE_PROC (1,code); |
23a62151 | 63 | SCM_RETURN_NEWSMOB (scm_tc16_macro, code); |
99027e3c | 64 | } |
1bbd0b84 | 65 | #undef FUNC_NAME |
99027e3c MD |
66 | |
67 | ||
3b3b36dd | 68 | SCM_DEFINE (scm_makmacro, "procedure->macro", 1, 0, 0, |
1bbd0b84 | 69 | (SCM code), |
07f7f249 GB |
70 | "Returns a @dfn{macro} which, when a symbol defined to this value\n" |
71 | "appears as the first symbol in an expression, evaluates the result\n" | |
72 | "of applying @var{code} to the expression and the environment.\n" | |
73 | "The value returned from @var{code} which has been passed to\n" | |
74 | "@code{procedure->memoizing-macro} replaces the form passed to\n" | |
75 | "@var{code}. For example:\n\n" | |
76 | "@example\n" | |
77 | "(define trace\n" | |
78 | " (procedure->macro\n" | |
79 | " (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n" | |
80 | "(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n" | |
81 | "@end example\n") | |
1bbd0b84 | 82 | #define FUNC_NAME s_scm_makmacro |
99027e3c | 83 | { |
3b3b36dd | 84 | SCM_VALIDATE_PROC (1,code); |
23a62151 | 85 | SCM_RETURN_NEWSMOB (scm_tc16_macro | (1L << 16), code); |
99027e3c | 86 | } |
1bbd0b84 | 87 | #undef FUNC_NAME |
99027e3c MD |
88 | |
89 | ||
3b3b36dd | 90 | SCM_DEFINE (scm_makmmacro, "procedure->memoizing-macro", 1, 0, 0, |
1bbd0b84 | 91 | (SCM code), |
07f7f249 GB |
92 | "Returns a @dfn{macro} which, when a symbol defined to this value\n" |
93 | "appears as the first symbol in an expression, evaluates the result\n" | |
94 | "of applying @var{proc} to the expression and the environment.\n" | |
95 | "The value returned from @var{proc} which has been passed to\n" | |
96 | "@code{procedure->memoizing-macro} replaces the form passed to\n" | |
97 | "@var{proc}. For example:\n\n" | |
98 | "@example\n" | |
99 | "(define trace\n" | |
100 | " (procedure->macro\n" | |
101 | " (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n" | |
102 | "(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n" | |
103 | "@end example\n") | |
1bbd0b84 | 104 | #define FUNC_NAME s_scm_makmmacro |
99027e3c | 105 | { |
3b3b36dd | 106 | SCM_VALIDATE_PROC (1,code); |
23a62151 | 107 | SCM_RETURN_NEWSMOB (scm_tc16_macro | (2L << 16), code); |
99027e3c | 108 | } |
1bbd0b84 | 109 | #undef FUNC_NAME |
99027e3c MD |
110 | |
111 | ||
a1ec6916 | 112 | SCM_DEFINE (scm_macro_p, "macro?", 1, 0, 0, |
1bbd0b84 | 113 | (SCM obj), |
b380b885 MD |
114 | "Return @code{#t} if @var{obj} is a regular macro, a memoizing macro or a\n" |
115 | "syntax transformer.") | |
1bbd0b84 | 116 | #define FUNC_NAME s_scm_macro_p |
99027e3c | 117 | { |
1bbd0b84 | 118 | return SCM_BOOL(SCM_NIMP (obj) && SCM_TYP16 (obj) == scm_tc16_macro); |
99027e3c | 119 | } |
1bbd0b84 | 120 | #undef FUNC_NAME |
99027e3c MD |
121 | |
122 | ||
123 | SCM_SYMBOL (scm_sym_syntax, "syntax"); | |
124 | SCM_SYMBOL (scm_sym_macro, "macro"); | |
125 | SCM_SYMBOL (scm_sym_mmacro, "macro!"); | |
126 | ||
a1ec6916 | 127 | SCM_DEFINE (scm_macro_type, "macro-type", 1, 0, 0, |
1bbd0b84 | 128 | (SCM m), |
b380b885 MD |
129 | "Return one of the symbols @code{syntax}, @code{macro} or @code{macro!},\n" |
130 | "depending on whether @var{obj} is a syntax tranformer, a regular macro,\n" | |
131 | "or a memoizing macro, respectively. If @var{obj} is not a macro,\n" | |
132 | "@code{#f} is returned.") | |
1bbd0b84 | 133 | #define FUNC_NAME s_scm_macro_type |
99027e3c MD |
134 | { |
135 | if (!(SCM_NIMP (m) && SCM_TYP16 (m) == scm_tc16_macro)) | |
136 | return SCM_BOOL_F; | |
413cb56f | 137 | switch ((int) (SCM_CARBITS (m) >> 16)) |
99027e3c MD |
138 | { |
139 | case 0: return scm_sym_syntax; | |
140 | case 1: return scm_sym_macro; | |
141 | case 2: return scm_sym_mmacro; | |
1bbd0b84 | 142 | default: scm_wrong_type_arg (FUNC_NAME, 1, m); |
99027e3c MD |
143 | } |
144 | } | |
1bbd0b84 | 145 | #undef FUNC_NAME |
99027e3c MD |
146 | |
147 | ||
a1ec6916 | 148 | SCM_DEFINE (scm_macro_name, "macro-name", 1, 0, 0, |
1bbd0b84 | 149 | (SCM m), |
b380b885 | 150 | "") |
1bbd0b84 | 151 | #define FUNC_NAME s_scm_macro_name |
99027e3c | 152 | { |
3b3b36dd | 153 | SCM_VALIDATE_SMOB (1,m,macro); |
99027e3c MD |
154 | return scm_procedure_name (SCM_CDR (m)); |
155 | } | |
1bbd0b84 | 156 | #undef FUNC_NAME |
99027e3c MD |
157 | |
158 | ||
a1ec6916 | 159 | SCM_DEFINE (scm_macro_transformer, "macro-transformer", 1, 0, 0, |
1bbd0b84 | 160 | (SCM m), |
b380b885 | 161 | "") |
1bbd0b84 | 162 | #define FUNC_NAME s_scm_macro_transformer |
99027e3c | 163 | { |
3b3b36dd | 164 | SCM_VALIDATE_SMOB (1,m,macro); |
99027e3c MD |
165 | return SCM_CLOSUREP (SCM_CDR (m)) ? SCM_CDR (m) : SCM_BOOL_F; |
166 | } | |
1bbd0b84 | 167 | #undef FUNC_NAME |
99027e3c MD |
168 | |
169 | SCM | |
1bbd0b84 | 170 | scm_make_synt (const char *name, SCM (*macroizer) (), SCM (*fcn)() ) |
99027e3c MD |
171 | { |
172 | SCM symcell = scm_sysintern (name, SCM_UNDEFINED); | |
26cfa3be MD |
173 | SCM transformer = scm_make_subr_opt (name, scm_tc7_subr_2, fcn, 0); |
174 | SCM_SETCDR (symcell, macroizer (transformer)); | |
99027e3c MD |
175 | return SCM_CAR (symcell); |
176 | } | |
177 | ||
178 | void | |
179 | scm_init_macros () | |
180 | { | |
23a62151 MD |
181 | scm_tc16_macro = scm_make_smob_type_mfpe ("macro", 0, |
182 | scm_markcdr, NULL, NULL, NULL); | |
99027e3c MD |
183 | #include "macros.x" |
184 | } |