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/* Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
#include "_scm.h"
#include "smob.h"
#include "validate.h"
#include "macros.h"
long scm_tc16_macro;
SCM_DEFINE (scm_makacro, "procedure->syntax", 1, 0, 0,
(SCM code),
"Returns a @dfn{macro} which, when a symbol defined to this value\n"
"appears as the first symbol in an expression, returns the result\n"
"of applying @var{code} to the expression and the environment.")
#define FUNC_NAME s_scm_makacro
{
SCM_VALIDATE_PROC (1,code);
SCM_RETURN_NEWSMOB (scm_tc16_macro, code);
}
#undef FUNC_NAME
SCM_DEFINE (scm_makmacro, "procedure->macro", 1, 0, 0,
(SCM code),
"Returns a @dfn{macro} which, when a symbol defined to this value\n"
"appears as the first symbol in an expression, evaluates the result\n"
"of applying @var{code} to the expression and the environment.\n"
"The value returned from @var{code} which has been passed to\n"
"@code{procedure->memoizing-macro} replaces the form passed to\n"
"@var{code}. For example:\n\n"
"@example\n"
"(define trace\n"
" (procedure->macro\n"
" (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n"
"(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n"
"@end example\n")
#define FUNC_NAME s_scm_makmacro
{
SCM_VALIDATE_PROC (1,code);
SCM_RETURN_NEWSMOB (scm_tc16_macro | (1L << 16), code);
}
#undef FUNC_NAME
SCM_DEFINE (scm_makmmacro, "procedure->memoizing-macro", 1, 0, 0,
(SCM code),
"Returns a @dfn{macro} which, when a symbol defined to this value\n"
"appears as the first symbol in an expression, evaluates the result\n"
"of applying @var{proc} to the expression and the environment.\n"
"The value returned from @var{proc} which has been passed to\n"
"@code{procedure->memoizing-macro} replaces the form passed to\n"
"@var{proc}. For example:\n\n"
"@example\n"
"(define trace\n"
" (procedure->macro\n"
" (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n"
"(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n"
"@end example\n")
#define FUNC_NAME s_scm_makmmacro
{
SCM_VALIDATE_PROC (1,code);
SCM_RETURN_NEWSMOB (scm_tc16_macro | (2L << 16), code);
}
#undef FUNC_NAME
SCM_DEFINE (scm_macro_p, "macro?", 1, 0, 0,
(SCM obj),
"Return @code{#t} if @var{obj} is a regular macro, a memoizing macro or a\n"
"syntax transformer.")
#define FUNC_NAME s_scm_macro_p
{
return SCM_BOOL(SCM_NIMP (obj) && SCM_TYP16 (obj) == scm_tc16_macro);
}
#undef FUNC_NAME
SCM_SYMBOL (scm_sym_syntax, "syntax");
SCM_SYMBOL (scm_sym_macro, "macro");
SCM_SYMBOL (scm_sym_mmacro, "macro!");
SCM_DEFINE (scm_macro_type, "macro-type", 1, 0, 0,
(SCM m),
"Return one of the symbols @code{syntax}, @code{macro} or @code{macro!},\n"
"depending on whether @var{obj} is a syntax tranformer, a regular macro,\n"
"or a memoizing macro, respectively. If @var{obj} is not a macro,\n"
"@code{#f} is returned.")
#define FUNC_NAME s_scm_macro_type
{
if (!(SCM_NIMP (m) && SCM_TYP16 (m) == scm_tc16_macro))
return SCM_BOOL_F;
switch ((int) (SCM_CARBITS (m) >> 16))
{
case 0: return scm_sym_syntax;
case 1: return scm_sym_macro;
case 2: return scm_sym_mmacro;
default: scm_wrong_type_arg (FUNC_NAME, 1, m);
}
}
#undef FUNC_NAME
SCM_DEFINE (scm_macro_name, "macro-name", 1, 0, 0,
(SCM m),
"")
#define FUNC_NAME s_scm_macro_name
{
SCM_VALIDATE_SMOB (1,m,macro);
return scm_procedure_name (SCM_CDR (m));
}
#undef FUNC_NAME
SCM_DEFINE (scm_macro_transformer, "macro-transformer", 1, 0, 0,
(SCM m),
"")
#define FUNC_NAME s_scm_macro_transformer
{
SCM_VALIDATE_SMOB (1,m,macro);
return SCM_CLOSUREP (SCM_CDR (m)) ? SCM_CDR (m) : SCM_BOOL_F;
}
#undef FUNC_NAME
SCM
scm_make_synt (const char *name, SCM (*macroizer) (), SCM (*fcn)() )
{
SCM symcell = scm_sysintern (name, SCM_UNDEFINED);
SCM transformer = scm_make_subr_opt (name, scm_tc7_subr_2, fcn, 0);
SCM_SETCDR (symcell, macroizer (transformer));
return SCM_CAR (symcell);
}
void
scm_init_macros ()
{
scm_tc16_macro = scm_make_smob_type_mfpe ("macro", 0,
scm_markcdr, NULL, NULL, NULL);
#include "macros.x"
}
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