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7888309be8
SCM_NEGATE_BOOL, SCM_BOOLP): Deprecated by moving into "deprecated.h". Replaced all uses with scm_is_false, scm_is_true, scm_from_bool, and scm_is_bool, respectively.
249 lines
7 KiB
C
249 lines
7 KiB
C
/* Copyright (C) 1995,1996,1997,1998,2000,2001,2002,2003 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "libguile/_scm.h"
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#include "libguile/alist.h" /* for SCM_EXTEND_ENV (well...) */
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#include "libguile/eval.h"
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#include "libguile/ports.h"
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#include "libguile/print.h"
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#include "libguile/root.h"
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#include "libguile/smob.h"
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#include "libguile/deprecation.h"
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#include "libguile/validate.h"
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#include "libguile/macros.h"
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scm_t_bits scm_tc16_macro;
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static int
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macro_print (SCM macro, SCM port, scm_print_state *pstate)
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{
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SCM code = SCM_MACRO_CODE (macro);
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if (!SCM_CLOSUREP (code)
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|| scm_is_false (scm_procedure_p (SCM_PRINT_CLOSURE))
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|| scm_is_false (scm_printer_apply (SCM_PRINT_CLOSURE,
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macro, port, pstate)))
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{
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if (!SCM_CLOSUREP (code))
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scm_puts ("#<primitive-", port);
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else
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scm_puts ("#<", port);
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if (SCM_MACRO_TYPE (macro) == 0)
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scm_puts ("syntax", port);
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#if SCM_ENABLE_DEPRECATED == 1
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if (SCM_MACRO_TYPE (macro) == 1)
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scm_puts ("macro", port);
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#endif
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if (SCM_MACRO_TYPE (macro) == 2)
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scm_puts ("macro!", port);
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if (SCM_MACRO_TYPE (macro) == 3)
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scm_puts ("builtin-macro!", port);
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scm_putc (' ', port);
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scm_iprin1 (scm_macro_name (macro), port, pstate);
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if (SCM_CLOSUREP (code) && SCM_PRINT_SOURCE_P)
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{
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SCM formals = SCM_CLOSURE_FORMALS (code);
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SCM env = SCM_ENV (code);
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SCM xenv = SCM_EXTEND_ENV (formals, SCM_EOL, env);
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SCM src = scm_i_unmemocopy_body (SCM_CODE (code), xenv);
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scm_putc (' ', port);
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scm_iprin1 (src, port, pstate);
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}
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scm_putc ('>', port);
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}
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return 1;
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}
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static SCM
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makmac (SCM code, scm_t_bits flags)
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{
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SCM z;
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SCM_NEWSMOB (z, scm_tc16_macro, SCM_UNPACK (code));
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SCM_SET_SMOB_FLAGS (z, flags);
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return z;
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}
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/* Return a mmacro that is known to be one of guile's built in macros. */
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SCM
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scm_i_makbimacro (SCM code)
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#define FUNC_NAME "scm_i_makbimacro"
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{
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SCM_VALIDATE_PROC (1, code);
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return makmac (code, 3);
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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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"Return 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\n"
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"result of applying @var{code} to the expression and the\n"
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"environment.\n\n"
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"@code{procedure->memoizing-macro} is the same as\n"
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"@code{procedure->macro}, except that the expression returned by\n"
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"@var{code} replaces the original macro expression in the memoized\n"
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"form of the containing code.")
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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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return makmac (code, 2);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_makacro, "procedure->syntax", 1, 0, 0,
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(SCM code),
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"Return 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\n"
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"result of applying @var{code} to the expression and the\n"
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"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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return makmac (code, 0);
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}
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#undef FUNC_NAME
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#if SCM_ENABLE_DEPRECATED == 1
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SCM_DEFINE (scm_makmacro, "procedure->macro", 1, 0, 0,
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(SCM code),
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"Return 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\n"
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"result of applying @var{code} to the expression and the\n"
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"environment. For example:\n"
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"\n"
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"@lisp\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 lisp")
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#define FUNC_NAME s_scm_makmacro
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{
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scm_c_issue_deprecation_warning
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("The function procedure->macro is deprecated, and so are"
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" non-memoizing macros in general. Use memoizing macros"
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" or r5rs macros instead.");
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SCM_VALIDATE_PROC (1, code);
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return makmac (code, 1);
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}
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#undef FUNC_NAME
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#endif
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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_from_bool (SCM_SMOB_PREDICATE (scm_tc16_macro, obj));
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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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#if SCM_ENABLE_DEPRECATED == 1
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SCM_SYMBOL (scm_sym_macro, "macro");
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#endif
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SCM_SYMBOL (scm_sym_mmacro, "macro!");
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SCM_SYMBOL (scm_sym_bimacro, "builtin-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\n"
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"@code{macro!}, depending on whether @var{m} is a syntax\n"
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"transformer, a regular macro, or a memoizing macro,\n"
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"respectively. If @var{m} is not a macro, @code{#f} is\n"
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"returned.")
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#define FUNC_NAME s_scm_macro_type
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{
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if (!SCM_SMOB_PREDICATE (scm_tc16_macro, m))
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return SCM_BOOL_F;
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switch (SCM_MACRO_TYPE (m))
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{
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case 0: return scm_sym_syntax;
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#if SCM_ENABLE_DEPRECATED == 1
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case 1: return scm_sym_macro;
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#endif
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case 2: return scm_sym_mmacro;
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case 3: return scm_sym_bimacro;
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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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"Return the name of the macro @var{m}.")
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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_PACK (SCM_SMOB_DATA (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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"Return the transformer of the macro @var{m}.")
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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_PACK (SCM_SMOB_DATA (m)))) ?
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SCM_PACK(SCM_SMOB_DATA (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 var = scm_c_define (name, SCM_UNDEFINED);
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SCM transformer = scm_c_make_subr (name, scm_tc7_subr_2, fcn);
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SCM_VARIABLE_SET (var, macroizer (transformer));
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return SCM_UNSPECIFIED;
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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 ("macro", 0);
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scm_set_smob_mark (scm_tc16_macro, scm_markcdr);
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scm_set_smob_print (scm_tc16_macro, macro_print);
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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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