1 /* Copyright (C) 1995,1996,1997,1998,2000,2001,2002 Free Software Foundation, Inc.
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)
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.
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
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
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.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
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.
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. */
45 #include "libguile/_scm.h"
46 #include "libguile/alist.h" /* for SCM_EXTEND_ENV (well...) */
47 #include "libguile/eval.h"
48 #include "libguile/ports.h"
49 #include "libguile/print.h"
50 #include "libguile/root.h"
51 #include "libguile/smob.h"
53 #include "libguile/validate.h"
54 #include "libguile/macros.h"
56 scm_t_bits scm_tc16_macro
;
60 macro_print (SCM macro
, SCM port
, scm_print_state
*pstate
)
62 SCM code
= SCM_MACRO_CODE (macro
);
63 if (!SCM_CLOSUREP (code
)
64 || SCM_FALSEP (scm_procedure_p (SCM_PRINT_CLOSURE
))
65 || SCM_FALSEP (scm_printer_apply (SCM_PRINT_CLOSURE
,
66 macro
, port
, pstate
)))
68 if (!SCM_CLOSUREP (code
))
69 scm_puts ("#<primitive-", port
);
71 scm_puts ("#<", port
);
73 if (SCM_MACRO_TYPE (macro
) == 0)
74 scm_puts ("syntax", port
);
75 #if SCM_ENABLE_DEPRECATED == 1
76 if (SCM_MACRO_TYPE (macro
) == 1)
77 scm_puts ("macro", port
);
79 if (SCM_MACRO_TYPE (macro
) == 2)
80 scm_puts ("macro!", port
);
82 scm_iprin1 (scm_macro_name (macro
), port
, pstate
);
84 if (SCM_CLOSUREP (code
) && SCM_PRINT_SOURCE_P
)
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
);
91 scm_iprin1 (src
, port
, pstate
);
101 SCM_DEFINE (scm_makacro
, "procedure->syntax", 1, 0, 0,
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"
107 #define FUNC_NAME s_scm_makacro
109 SCM_VALIDATE_PROC (1, code
);
110 SCM_RETURN_NEWSMOB (scm_tc16_macro
, SCM_UNPACK (code
));
115 #if SCM_ENABLE_DEPRECATED == 1
117 SCM_DEFINE (scm_makmacro
, "procedure->macro", 1, 0, 0,
119 "Return a @dfn{macro} which, when a symbol defined to this value\n"
120 "appears as the first symbol in an expression, evaluates the\n"
121 "result of applying @var{code} to the expression and the\n"
122 "environment. For example:\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"
130 #define FUNC_NAME s_scm_makmacro
132 scm_c_issue_deprecation_warning
133 ("The function procedure->macro is deprecated, and so are"
134 " non-memoizing macros in general. Use memoizing macros"
135 " or r5rs macros instead.");
137 SCM_VALIDATE_PROC (1, code
);
138 SCM_RETURN_NEWSMOB (scm_tc16_macro
| (1L << 16), SCM_UNPACK (code
));
145 SCM_DEFINE (scm_makmmacro
, "procedure->memoizing-macro", 1, 0, 0,
147 "Return a @dfn{macro} which, when a symbol defined to this value\n"
148 "appears as the first symbol in an expression, evaluates the\n"
149 "result of applying @var{code} to the expression and the\n"
151 "@code{procedure->memoizing-macro} is the same as\n"
152 "@code{procedure->macro}, except that the expression returned by\n"
153 "@var{code} replaces the original macro expression in the memoized\n"
154 "form of the containing code.")
155 #define FUNC_NAME s_scm_makmmacro
157 SCM_VALIDATE_PROC (1, code
);
158 SCM_RETURN_NEWSMOB (scm_tc16_macro
| (2L << 16), SCM_UNPACK (code
));
163 SCM_DEFINE (scm_macro_p
, "macro?", 1, 0, 0,
165 "Return @code{#t} if @var{obj} is a regular macro, a memoizing macro or a\n"
166 "syntax transformer.")
167 #define FUNC_NAME s_scm_macro_p
169 return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_macro
, obj
));
174 SCM_SYMBOL (scm_sym_syntax
, "syntax");
175 #if SCM_ENABLE_DEPRECATED == 1
176 SCM_SYMBOL (scm_sym_macro
, "macro");
178 SCM_SYMBOL (scm_sym_mmacro
, "macro!");
180 SCM_DEFINE (scm_macro_type
, "macro-type", 1, 0, 0,
182 "Return one of the symbols @code{syntax}, @code{macro} or\n"
183 "@code{macro!}, depending on whether @var{m} is a syntax\n"
184 "transformer, a regular macro, or a memoizing macro,\n"
185 "respectively. If @var{m} is not a macro, @code{#f} is\n"
187 #define FUNC_NAME s_scm_macro_type
189 if (!SCM_TYP16_PREDICATE (scm_tc16_macro
, m
))
191 switch (SCM_MACRO_TYPE (m
))
193 case 0: return scm_sym_syntax
;
194 #if SCM_ENABLE_DEPRECATED == 1
195 case 1: return scm_sym_macro
;
197 case 2: return scm_sym_mmacro
;
198 default: scm_wrong_type_arg (FUNC_NAME
, 1, m
);
204 SCM_DEFINE (scm_macro_name
, "macro-name", 1, 0, 0,
206 "Return the name of the macro @var{m}.")
207 #define FUNC_NAME s_scm_macro_name
209 SCM_VALIDATE_SMOB (1, m
, macro
);
210 return scm_procedure_name (SCM_PACK (SCM_SMOB_DATA (m
)));
215 SCM_DEFINE (scm_macro_transformer
, "macro-transformer", 1, 0, 0,
217 "Return the transformer of the macro @var{m}.")
218 #define FUNC_NAME s_scm_macro_transformer
220 SCM_VALIDATE_SMOB (1, m
, macro
);
221 return ((SCM_CLOSUREP (SCM_PACK (SCM_SMOB_DATA (m
)))) ?
222 SCM_PACK(SCM_SMOB_DATA (m
)) : SCM_BOOL_F
);
227 scm_make_synt (const char *name
, SCM (*macroizer
) (), SCM (*fcn
)() )
229 SCM var
= scm_c_define (name
, SCM_UNDEFINED
);
230 SCM transformer
= scm_c_make_subr (name
, scm_tc7_subr_2
, fcn
);
231 SCM_VARIABLE_SET (var
, macroizer (transformer
));
232 return SCM_UNSPECIFIED
;
238 scm_tc16_macro
= scm_make_smob_type ("macro", 0);
239 scm_set_smob_mark (scm_tc16_macro
, scm_markcdr
);
240 scm_set_smob_print (scm_tc16_macro
, macro_print
);
241 #include "libguile/macros.x"