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191 lines
6.7 KiB
C
191 lines
6.7 KiB
C
/* Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
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gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
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#include "libguile/_scm.h"
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#include "libguile/root.h"
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#include "libguile/smob.h"
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#include "libguile/validate.h"
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#include "libguile/macros.h"
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long scm_tc16_macro;
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SCM_DEFINE (scm_makacro, "procedure->syntax", 1, 0, 0,
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(SCM code),
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"Returns a @dfn{macro} which, when a symbol defined to this value\n"
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"appears as the first symbol in an expression, returns the result\n"
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"of applying @var{code} to the expression and the environment.")
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#define FUNC_NAME s_scm_makacro
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{
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SCM_VALIDATE_PROC (1,code);
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SCM_RETURN_NEWSMOB (scm_tc16_macro, SCM_UNPACK (code));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_makmacro, "procedure->macro", 1, 0, 0,
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(SCM code),
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"Returns a @dfn{macro} which, when a symbol defined to this value\n"
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"appears as the first symbol in an expression, evaluates the result\n"
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"of applying @var{code} to the expression and the environment.\n"
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"The value returned from @var{code} which has been passed to\n"
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"@code{procedure->memoizing-macro} replaces the form passed to\n"
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"@var{code}. For example:\n\n"
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"@example\n"
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"(define trace\n"
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" (procedure->macro\n"
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" (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n"
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"(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n"
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"@end example\n")
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#define FUNC_NAME s_scm_makmacro
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{
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SCM_VALIDATE_PROC (1,code);
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SCM_RETURN_NEWSMOB (scm_tc16_macro | (1L << 16), SCM_UNPACK (code));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_makmmacro, "procedure->memoizing-macro", 1, 0, 0,
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(SCM code),
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"Returns a @dfn{macro} which, when a symbol defined to this value\n"
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"appears as the first symbol in an expression, evaluates the result\n"
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"of applying @var{proc} to the expression and the environment.\n"
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"The value returned from @var{proc} which has been passed to\n"
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"@code{procedure->memoizing-macro} replaces the form passed to\n"
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"@var{proc}. For example:\n\n"
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"@example\n"
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"(define trace\n"
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" (procedure->macro\n"
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" (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n"
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"(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n"
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"@end example\n")
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#define FUNC_NAME s_scm_makmmacro
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{
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SCM_VALIDATE_PROC (1,code);
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SCM_RETURN_NEWSMOB (scm_tc16_macro | (2L << 16), SCM_UNPACK (code));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_macro_p, "macro?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} if @var{obj} is a regular macro, a memoizing macro or a\n"
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"syntax transformer.")
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#define FUNC_NAME s_scm_macro_p
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{
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return SCM_BOOL(SCM_NIMP (obj) && SCM_TYP16 (obj) == scm_tc16_macro);
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}
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#undef FUNC_NAME
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SCM_SYMBOL (scm_sym_syntax, "syntax");
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SCM_SYMBOL (scm_sym_macro, "macro");
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SCM_SYMBOL (scm_sym_mmacro, "macro!");
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SCM_DEFINE (scm_macro_type, "macro-type", 1, 0, 0,
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(SCM m),
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"Return one of the symbols @code{syntax}, @code{macro} or @code{macro!},\n"
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"depending on whether @var{obj} is a syntax tranformer, a regular macro,\n"
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"or a memoizing macro, respectively. If @var{obj} is not a macro,\n"
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"@code{#f} is returned.")
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#define FUNC_NAME s_scm_macro_type
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{
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if (!(SCM_NIMP (m) && SCM_TYP16 (m) == scm_tc16_macro))
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return SCM_BOOL_F;
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switch (SCM_CELL_WORD_0 (m) >> 16)
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{
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case 0: return scm_sym_syntax;
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case 1: return scm_sym_macro;
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case 2: return scm_sym_mmacro;
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default: scm_wrong_type_arg (FUNC_NAME, 1, m);
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}
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_macro_name, "macro-name", 1, 0, 0,
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(SCM m),
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"")
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#define FUNC_NAME s_scm_macro_name
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{
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SCM_VALIDATE_SMOB (1,m,macro);
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return scm_procedure_name (SCM_CDR (m));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_macro_transformer, "macro-transformer", 1, 0, 0,
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(SCM m),
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"")
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#define FUNC_NAME s_scm_macro_transformer
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{
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SCM_VALIDATE_SMOB (1,m,macro);
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return SCM_CLOSUREP (SCM_CDR (m)) ? SCM_CDR (m) : SCM_BOOL_F;
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}
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#undef FUNC_NAME
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SCM
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scm_make_synt (const char *name, SCM (*macroizer) (), SCM (*fcn)() )
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{
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SCM symcell = scm_sysintern (name, SCM_UNDEFINED);
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SCM transformer = scm_make_subr_opt (name, scm_tc7_subr_2, fcn, 0);
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SCM_SETCDR (symcell, macroizer (transformer));
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return SCM_CAR (symcell);
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}
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void
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scm_init_macros ()
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{
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scm_tc16_macro = scm_make_smob_type_mfpe ("macro", 0,
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scm_markcdr, NULL, NULL, NULL);
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#include "libguile/macros.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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