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#include <string.h>
#include <mruby.h>
#include <mruby/class.h>
#include <mruby/data.h>
#include <mruby/string.h>
#define NATIVE_TYPES \
char c; \
mrb_float f; \
mrb_int i; \
mrb_sym n; \
char *s; \
struct RClass *C
typedef enum {
ARG_c,
ARG_f,
ARG_i,
ARG_n,
ARG_s,
ARG_C,
ARG_v,
} VFArgumentType;
typedef struct {
VFArgumentType type;
union { NATIVE_TYPES; };
} VFNative;
typedef struct {
VFArgumentType type;
union {
NATIVE_TYPES;
mrb_value v;
};
} VFArgument;
static void
native_free(mrb_state *mrb, void *data)
{
VFNative *native = (VFNative*)data;
if (native->type == ARG_s) mrb_free(mrb, native->s);
mrb_free(mrb, native);
}
static const struct mrb_data_type native_data_type = {
"TestVFormat::Native", native_free
};
static mrb_value
native_initialize(mrb_state *mrb, mrb_value self)
{
VFNative data, *datap;
mrb_value obj;
mrb_get_args(mrb, "o", &obj);
switch (mrb_type(obj)) {
case MRB_TT_FLOAT:
data.f = mrb_float(obj);
data.type = ARG_f;
break;
case MRB_TT_FIXNUM:
data.i = mrb_fixnum(obj);
data.type = ARG_i;
break;
case MRB_TT_SYMBOL:
data.n = mrb_symbol(obj);
data.type = ARG_n;
break;
case MRB_TT_CLASS: case MRB_TT_SCLASS: case MRB_TT_MODULE:
data.C = mrb_class_ptr(obj);
data.type = ARG_C;
break;
case MRB_TT_STRING: {
mrb_int len = RSTRING_LEN(obj);
const char *s = RSTRING_PTR(obj);
if (len == 1) {
/* one byte string is considered char */
data.c = s[0];
data.type = ARG_c;
}
else {
data.s = (char*)mrb_malloc(mrb, len + 1);
memcpy(data.s, s, len);
data.s[len] = '\0';
data.type = ARG_s;
}
break;
}
default: {
mrb_value msg = mrb_str_new_cstr(mrb, "native type for ");
mrb_str_cat_cstr(mrb, msg, mrb_class_name(mrb, mrb_class(mrb, obj)));
mrb_str_cat_cstr(mrb, msg, " is unknown");
mrb_raise(mrb, E_ARGUMENT_ERROR, RSTRING_PTR(msg));
}
}
datap = (VFNative*)mrb_malloc(mrb, sizeof(VFNative));
*datap = data;
mrb_data_init(self, datap, &native_data_type);
return self;
}
static VFArgument*
arg_from_obj(mrb_state *mrb, mrb_value obj, struct RClass *native_class,
VFArgument *vf_arg)
{
if (mrb_obj_is_instance_of(mrb, obj, native_class)) {
const VFNative *native = (VFNative*)DATA_PTR(obj);
*(VFNative*)vf_arg = *native;
}
else {
vf_arg->v = obj;
vf_arg->type = ARG_v;
}
return vf_arg;
}
#define VF_FORMAT_INIT(klass) \
struct RClass *vf_native_class = \
mrb_class_get_under(mrb, mrb_class_ptr(klass), "Native"); \
VFArgument vf_args[2];
#define VF_ARG(args, idx) \
arg_from_obj(mrb, args[idx], vf_native_class, &vf_args[idx])
#define VF_FORMAT0(fmt) mrb_format(mrb, fmt);
#define VF_FORMAT1(fmt, args) \
(VF_ARG(args, 0), VF_FORMAT_TYPED(fmt, 1, vf_args, NULL))
#define VF_FORMAT2(fmt, args) ( \
VF_ARG(args, 0), VF_ARG(args, 1), \
VF_FORMAT2_COND_EXPR(fmt, vf_args, vf_args+1, c) : \
VF_FORMAT2_COND_EXPR(fmt, vf_args, vf_args+1, f) : \
VF_FORMAT2_COND_EXPR(fmt, vf_args, vf_args+1, i) : \
VF_FORMAT2_COND_EXPR(fmt, vf_args, vf_args+1, n) : \
VF_FORMAT2_COND_EXPR(fmt, vf_args, vf_args+1, s) : \
VF_FORMAT2_COND_EXPR(fmt, vf_args, vf_args+1, C) : \
VF_FORMAT2_COND_EXPR(fmt, vf_args, vf_args+1, v) : \
mrb_nil_value() /* not reached */ \
)
#define VF_FORMAT2_COND_EXPR(fmt, a1, a2, t) \
a1->type == ARG_##t ? VF_FORMAT_TYPED(fmt, 2, a2, (a1)->t)
#define VF_FORMAT_TYPED(fmt, n_arg, type_a, v1) \
VF_FORMAT_TYPED_COND_EXPR(fmt, n_arg, type_a, v1, c) : \
VF_FORMAT_TYPED_COND_EXPR(fmt, n_arg, type_a, v1, f) : \
VF_FORMAT_TYPED_COND_EXPR(fmt, n_arg, type_a, v1, i) : \
VF_FORMAT_TYPED_COND_EXPR(fmt, n_arg, type_a, v1, n) : \
VF_FORMAT_TYPED_COND_EXPR(fmt, n_arg, type_a, v1, s) : \
VF_FORMAT_TYPED_COND_EXPR(fmt, n_arg, type_a, v1, C) : \
VF_FORMAT_TYPED_COND_EXPR(fmt, n_arg, type_a, v1, v) : \
mrb_nil_value() /* not reached */
#define VF_FORMAT_TYPED_COND_EXPR(fmt, n_arg, type_a, v1, t) \
(type_a)->type == ARG_##t ? n_arg == 1 ? \
mrb_format(mrb, fmt, (type_a)->t) : mrb_format(mrb, fmt, v1, (type_a)->t)
static mrb_value
vf_s_format(mrb_state *mrb, mrb_value klass)
{
mrb_value fmt_str, args[2];
mrb_int argc = mrb_get_args(mrb, "S|oo", &fmt_str, args, args+1);
const char *fmt = mrb_string_value_cstr(mrb, &fmt_str);
VF_FORMAT_INIT(klass);
switch (argc) {
case 1: return VF_FORMAT0(fmt);
case 2: return VF_FORMAT1(fmt, args);
case 3: return VF_FORMAT2(fmt, args);
default: return mrb_nil_value(); /* not reached */
}
}
void
mrb_init_test_vformat(mrb_state *mrb)
{
struct RClass *vf, *n;
vf = mrb_define_module(mrb, "TestVFormat");
mrb_define_class_method(mrb, vf, "format", vf_s_format, MRB_ARGS_ARG(1,2));
n = mrb_define_class_under(mrb, vf, "Native", mrb->object_class);
MRB_SET_INSTANCE_TT(n, MRB_TT_DATA);
mrb_define_method(mrb, n, "initialize", native_initialize, MRB_ARGS_REQ(1));
mrb_singleton_class(mrb, mrb_obj_value(n));
mrb_define_alias(mrb, n->c, "[]", "new");
}
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