|| scm_is_false (scm_printer_apply (SCM_PRINT_CLOSURE,
macro, port, pstate)))
{
+ scm_puts ("#<", port);
+
+ if (SCM_MACRO_TYPE (macro) < 4 && SCM_MACRO_IS_EXTENDED (macro))
+ scm_puts ("extended-", port);
+
if (!SCM_CLOSUREP (code) && !SCM_PROGRAM_P (code))
- scm_puts ("#<primitive-", port);
- else
- scm_puts ("#<", port);
+ scm_puts ("primitive-", port);
if (SCM_MACRO_TYPE (macro) == 0)
scm_puts ("syntax", port);
scm_puts ("macro!", port);
if (SCM_MACRO_TYPE (macro) == 3)
scm_puts ("builtin-macro!", port);
+ if (SCM_MACRO_TYPE (macro) == 4)
+ scm_puts ("syncase-macro", port);
scm_putc (' ', port);
scm_iprin1 (scm_macro_name (macro), port, pstate);
scm_iprin1 (src, port, pstate);
}
+ if (SCM_MACRO_IS_EXTENDED (macro))
+ {
+ scm_putc (' ', port);
+ scm_write (SCM_SMOB_OBJECT_2 (macro), port);
+ scm_putc (' ', port);
+ scm_write (SCM_SMOB_OBJECT_3 (macro), port);
+ }
+
scm_putc ('>', port);
}
return 1;
}
+static SCM
+macro_mark (SCM macro)
+{
+ if (SCM_MACRO_IS_EXTENDED (macro))
+ { scm_gc_mark (SCM_SMOB_OBJECT_2 (macro));
+ scm_gc_mark (SCM_SMOB_OBJECT_3 (macro));
+ }
+ return SCM_SMOB_OBJECT (macro);
+}
+
static SCM
makmac (SCM code, scm_t_bits flags)
{
#endif
+SCM_DEFINE (scm_make_syncase_macro, "make-syncase-macro", 2, 0, 0,
+ (SCM type, SCM binding),
+ "Return a @dfn{macro} that requires expansion by syntax-case.\n"
+ "While users should not call this function, it is useful to know\n"
+ "that syntax-case macros are represented as Guile primitive macros.")
+#define FUNC_NAME s_scm_make_syncase_macro
+{
+ SCM z;
+ SCM_VALIDATE_SYMBOL (1, type);
+
+ SCM_NEWSMOB3 (z, scm_tc16_macro, SCM_UNPACK (binding), SCM_UNPACK (type),
+ SCM_UNPACK (binding));
+ SCM_SET_SMOB_FLAGS (z, 4 | SCM_F_MACRO_EXTENDED);
+ return z;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_make_extended_syncase_macro, "make-extended-syncase-macro", 3, 0, 0,
+ (SCM m, SCM type, SCM binding),
+ "Extend a core macro @var{m} with a syntax-case binding.")
+#define FUNC_NAME s_scm_make_extended_syncase_macro
+{
+ SCM z;
+ SCM_VALIDATE_SMOB (1, m, macro);
+ SCM_VALIDATE_SYMBOL (2, type);
+
+ SCM_NEWSMOB3 (z, scm_tc16_macro, SCM_SMOB_DATA (m), SCM_UNPACK (type),
+ SCM_UNPACK (binding));
+ SCM_SET_SMOB_FLAGS (z, SCM_SMOB_FLAGS (m) | SCM_F_MACRO_EXTENDED);
+ return z;
+}
+#undef FUNC_NAME
+
+
SCM_DEFINE (scm_macro_p, "macro?", 1, 0, 0,
(SCM obj),
#endif
SCM_SYMBOL (scm_sym_mmacro, "macro!");
SCM_SYMBOL (scm_sym_bimacro, "builtin-macro!");
+SCM_SYMBOL (scm_sym_syncase_macro, "syncase-macro");
SCM_DEFINE (scm_macro_type, "macro-type", 1, 0, 0,
(SCM m),
- "Return one of the symbols @code{syntax}, @code{macro} or\n"
- "@code{macro!}, depending on whether @var{m} is a syntax\n"
- "transformer, a regular macro, or a memoizing macro,\n"
- "respectively. If @var{m} is not a macro, @code{#f} is\n"
- "returned.")
+ "Return one of the symbols @code{syntax}, @code{macro},\n"
+ "@code{macro!}, or @code{syntax-case}, depending on whether\n"
+ "@var{m} is a syntax transformer, a regular macro, a memoizing\n"
+ "macro, or a syntax-case macro, respectively. If @var{m} is\n"
+ "not a macro, @code{#f} is returned.")
#define FUNC_NAME s_scm_macro_type
{
if (!SCM_SMOB_PREDICATE (scm_tc16_macro, m))
#endif
case 2: return scm_sym_mmacro;
case 3: return scm_sym_bimacro;
+ case 4: return scm_sym_syncase_macro;
default: scm_wrong_type_arg (FUNC_NAME, 1, m);
}
}
#define FUNC_NAME s_scm_macro_name
{
SCM_VALIDATE_SMOB (1, m, macro);
- return scm_procedure_name (SCM_PACK (SCM_SMOB_DATA (m)));
+ if (scm_is_true (scm_procedure_p (SCM_SMOB_OBJECT (m))))
+ return scm_procedure_name (SCM_SMOB_OBJECT (m));
+ return SCM_BOOL_F;
}
#undef FUNC_NAME
}
#undef FUNC_NAME
+SCM_DEFINE (scm_syncase_macro_type, "syncase-macro-type", 1, 0, 0,
+ (SCM m),
+ "Return the type of the macro @var{m}.")
+#define FUNC_NAME s_scm_syncase_macro_type
+{
+ SCM_VALIDATE_SMOB (1, m, macro);
+
+ if (SCM_MACRO_IS_EXTENDED (m))
+ return SCM_SMOB_OBJECT_2 (m);
+ else
+ return SCM_BOOL_F;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_syncase_macro_binding, "syncase-macro-binding", 1, 0, 0,
+ (SCM m),
+ "Return the binding of the macro @var{m}.")
+#define FUNC_NAME s_scm_syncase_macro_binding
+{
+ SCM_VALIDATE_SMOB (1, m, macro);
+
+ if (SCM_MACRO_IS_EXTENDED (m))
+ return SCM_SMOB_OBJECT_3 (m);
+ else
+ return SCM_BOOL_F;
+}
+#undef FUNC_NAME
+
SCM
scm_make_synt (const char *name, SCM (*macroizer) (), SCM (*fcn)() )
{
scm_init_macros ()
{
scm_tc16_macro = scm_make_smob_type ("macro", 0);
- scm_set_smob_mark (scm_tc16_macro, scm_markcdr);
+ scm_set_smob_mark (scm_tc16_macro, macro_mark);
scm_set_smob_print (scm_tc16_macro, macro_print);
#include "libguile/macros.x"
}
#define SCM_ASSYNT(_cond, _msg, _subr) \
if (!(_cond)) scm_misc_error (_subr, _msg, SCM_EOL);
+#define SCM_MACRO_TYPE_BITS (3)
+#define SCM_MACRO_TYPE_MASK ((1<<SCM_MACRO_TYPE_BITS)-1)
+#define SCM_F_MACRO_EXTENDED (1<<SCM_MACRO_TYPE_BITS)
+
#define SCM_MACROP(x) SCM_SMOB_PREDICATE (scm_tc16_macro, (x))
-#define SCM_MACRO_TYPE(m) SCM_SMOB_FLAGS (m)
+#define SCM_MACRO_TYPE(m) (SCM_SMOB_FLAGS (m) & SCM_MACRO_TYPE_MASK)
+#define SCM_MACRO_IS_EXTENDED(m) (SCM_SMOB_FLAGS (m) & SCM_F_MACRO_EXTENDED)
#define SCM_BUILTIN_MACRO_P(x) (SCM_MACROP (x) && SCM_MACRO_TYPE (x) == 3)
+#define SCM_SYNCASE_MACRO_P(x) (SCM_MACROP (x) && SCM_MACRO_TYPE (x) == 4)
#define SCM_MACRO_CODE(m) SCM_SMOB_OBJECT (m)
SCM_API scm_t_bits scm_tc16_macro;
SCM_INTERNAL SCM scm_i_makbimacro (SCM code);
SCM_API SCM scm_makmmacro (SCM code);
SCM_API SCM scm_makacro (SCM code);
+SCM_API SCM scm_make_syncase_macro (SCM type, SCM binding);
+SCM_API SCM scm_make_extended_syncase_macro (SCM builtin, SCM type,
+ SCM binding);
SCM_API SCM scm_macro_p (SCM obj);
SCM_API SCM scm_macro_type (SCM m);
SCM_API SCM scm_macro_name (SCM m);
SCM_API SCM scm_macro_transformer (SCM m);
+SCM_API SCM scm_syncase_macro_type (SCM m);
+SCM_API SCM scm_syncase_macro_binding (SCM m);
SCM_API SCM scm_make_synt (const char *name,
SCM (*macroizer) (SCM),
SCM (*fcn) ());
;;; Keywords are syntactic bindings; variables are value bindings.
(define (module-define-keyword! mod sym type val)
(let ((v (or (module-local-variable mod sym)
- (let ((v (make-variable val)))
+ (let ((v (make-undefined-variable)))
(module-add! mod sym v)
v))))
- (if (or (not (variable-bound? v))
- (not (macro? (variable-ref v))))
- (variable-set! v val))
+ (variable-set! v
+ (if (and (variable-bound? v) (macro? (variable-ref v)))
+ (make-extended-syncase-macro (variable-ref v) type val)
+ (make-syncase-macro type val)))
(set-object-property! v '*sc-expander* (cons type val))))
(define (module-lookup-keyword mod sym)
;; probably should unbind the variable too
(set-object-properties! v (delq p (object-properties v)))))))
-(define sc-expand #f)
-(define sc-expand3 #f)
-(define install-global-transformer #f)
-(define $sc-dispatch #f)
+;;; API provided by psyntax
(define syntax-violation #f)
-(define (annotation? x) #f)
-
(define datum->syntax #f)
(define syntax->datum #f)
-
(define identifier? #f)
(define generate-temporaries #f)
(define bound-identifier=? #f)
(define free-identifier=? #f)
+(define sc-expand #f)
+(define sc-expand3 #f)
+
+;;; Implementation detail of psyntax -- the thing that does expand-time
+;;; dispatch for syntax-case macros
+(define $sc-dispatch #f)
+
+;;; Useless crap I'd like to get rid of
+(define install-global-transformer #f)
+(define (annotation? x) #f)
+
(define andmap
(lambda (f first . rest)
(apply f (cons x xr))
(and (apply f (cons x xr)) (andmap first rest)))))))))
-(define (syncase-error who format-string why what)
- (%start-stack 'syncase-stack
- (lambda ()
- (scm-error 'misc-error who "~A ~S" (list why what) '()))))
-
-;; Until the module system is booted, this will be the current expander.
(primitive-load-path "ice-9/psyntax-pp")
+;; Until the module system is booted, this will be the current expander.
(define %pre-modules-transformer sc-expand)
\f
HCoop / bpt / guile.git / commitdiff