mruby/src/class.c at master · tmash06/mruby · GitHub

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** class.c - Class class

** See Copyright Notice in mruby.h

#include <ctype.h>

#include <stdarg.h>

#include "mruby.h"

#include "mruby/array.h"

#include "mruby/class.h"

#include "mruby/numeric.h"

#include "mruby/proc.h"

#include "mruby/string.h"

#include "mruby/variable.h"

#include "mruby/error.h"

#include "mruby/data.h"

KHASH_DEFINE(mt, mrb_sym, struct RProc*, 1, kh_int_hash_func, kh_int_hash_equal)

void

mrb_gc_mark_mt(mrb_state *mrb, struct RClass *c)

{

khiter_t k;

khash_t(mt) *h = c->mt;

if (!h) return;

for (k = kh_begin(h); k != kh_end(h); k++) {

if (kh_exist(h, k)){

struct RProc *m = kh_value(h, k);

if (m) {

mrb_gc_mark(mrb, (struct RBasic*)m);

}

size_t

mrb_gc_mark_mt_size(mrb_state *mrb, struct RClass *c)

{

khash_t(mt) *h = c->mt;

if (!h) return 0;

return kh_size(h);

}

void

mrb_gc_free_mt(mrb_state *mrb, struct RClass *c)

{

kh_destroy(mt, mrb, c->mt);

}

static void

name_class(mrb_state *mrb, struct RClass *c, mrb_sym name)

{

mrb_obj_iv_set(mrb, (struct RObject*)c,

mrb_intern_lit(mrb, "__classid__"), mrb_symbol_value(name));

}

static void

setup_class(mrb_state *mrb, struct RClass *outer, struct RClass *c, mrb_sym id)

{

name_class(mrb, c, id);

mrb_obj_iv_set(mrb, (struct RObject*)outer, id, mrb_obj_value(c));

if (outer != mrb->object_class) {

mrb_obj_iv_set(mrb, (struct RObject*)c, mrb_intern_lit(mrb, "__outer__"),

mrb_obj_value(outer));

}

#define make_metaclass(mrb, c) prepare_singleton_class((mrb), (struct RBasic*)(c))

static void

prepare_singleton_class(mrb_state *mrb, struct RBasic *o)

{

struct RClass *sc, *c;

if (o->c->tt == MRB_TT_SCLASS) return;

sc = (struct RClass*)mrb_obj_alloc(mrb, MRB_TT_SCLASS, mrb->class_class);

sc->mt = 0;

sc->iv = 0;

if (o->tt == MRB_TT_CLASS) {

c = (struct RClass*)o;

if (!c->super) {

sc->super = mrb->class_class;

}

else {

sc->super = c->super->c;

}

else if (o->tt == MRB_TT_SCLASS) {

c = (struct RClass*)o;

while (c->super->tt == MRB_TT_ICLASS)

c = c->super;

make_metaclass(mrb, c->super);

sc->super = c->super->c;

}

else {

sc->super = o->c;

}

o->c = sc;

mrb_field_write_barrier(mrb, (struct RBasic*)o, (struct RBasic*)sc);

mrb_field_write_barrier(mrb, (struct RBasic*)sc, (struct RBasic*)o);

mrb_obj_iv_set(mrb, (struct RObject*)sc, mrb_intern_lit(mrb, "__attached__"), mrb_obj_value(o));

}

static struct RClass *

class_from_sym(mrb_state *mrb, struct RClass *klass, mrb_sym id)

{

mrb_value c = mrb_const_get(mrb, mrb_obj_value(klass), id);

mrb_check_type(mrb, c, MRB_TT_CLASS);

return mrb_class_ptr(c);

}

static struct RClass *

module_from_sym(mrb_state *mrb, struct RClass *klass, mrb_sym id)

{

mrb_value c = mrb_const_get(mrb, mrb_obj_value(klass), id);

mrb_check_type(mrb, c, MRB_TT_MODULE);

return mrb_class_ptr(c);

}

struct RClass*

mrb_class_outer_module(mrb_state *mrb, struct RClass *c)

{

mrb_value outer;

outer = mrb_obj_iv_get(mrb, (struct RObject*)c, mrb_intern_lit(mrb, "__outer__"));

if (mrb_nil_p(outer)) return 0;

return mrb_class_ptr(outer);

}

static struct RClass*

define_module(mrb_state *mrb, mrb_sym name, struct RClass *outer)

{

struct RClass *m;

if (mrb_const_defined_at(mrb, outer, name)) {

return module_from_sym(mrb, outer, name);

}

m = mrb_module_new(mrb);

setup_class(mrb, outer, m, name);

return m;

}

struct RClass*

mrb_define_module_id(mrb_state *mrb, mrb_sym name)

{

return define_module(mrb, name, mrb->object_class);

}

struct RClass*

mrb_define_module(mrb_state *mrb, const char *name)

{

return define_module(mrb, mrb_intern_cstr(mrb, name), mrb->object_class);

}

struct RClass*

mrb_vm_define_module(mrb_state *mrb, mrb_value outer, mrb_sym id)

{

return define_module(mrb, id, mrb_class_ptr(outer));

}

struct RClass *

mrb_define_module_under(mrb_state *mrb, struct RClass *outer, const char *name)

{

mrb_sym id = mrb_intern_cstr(mrb, name);

struct RClass * c = define_module(mrb, id, outer);

setup_class(mrb, outer, c, id);

return c;

}

static struct RClass*

define_class(mrb_state *mrb, mrb_sym name, struct RClass *super, struct RClass *outer)

{

struct RClass * c;

if (mrb_const_defined_at(mrb, outer, name)) {

c = class_from_sym(mrb, outer, name);

if (super && mrb_class_real(c->super) != super) {

mrb_raisef(mrb, E_TYPE_ERROR, "superclass mismatch for Class %S (%S not %S)",

mrb_sym2str(mrb, name),

mrb_obj_value(c->super), mrb_obj_value(super));

}

return c;

}

c = mrb_class_new(mrb, super);

setup_class(mrb, outer, c, name);

return c;

}

struct RClass*

mrb_define_class_id(mrb_state *mrb, mrb_sym name, struct RClass *super)

{

if (!super) {

mrb_warn(mrb, "no super class for `%S', Object assumed", mrb_sym2str(mrb, name));

}

return define_class(mrb, name, super, mrb->object_class);

}

struct RClass*

mrb_define_class(mrb_state *mrb, const char *name, struct RClass *super)

{

return mrb_define_class_id(mrb, mrb_intern_cstr(mrb, name), super);

}

struct RClass*

mrb_vm_define_class(mrb_state *mrb, mrb_value outer, mrb_value super, mrb_sym id)

{

struct RClass *s;

struct RClass *c;

if (!mrb_nil_p(super)) {

if (mrb_type(super) != MRB_TT_CLASS) {

mrb_raisef(mrb, E_TYPE_ERROR, "superclass must be a Class (%S given)", super);

}

s = mrb_class_ptr(super);

}

else {

s = 0;

}

switch (mrb_type(outer)) {

case MRB_TT_CLASS:

case MRB_TT_MODULE:

break;

default:

mrb_raisef(mrb, E_TYPE_ERROR, "%S is not a class/module", outer);

break;

}

c = define_class(mrb, id, s, mrb_class_ptr(outer));

mrb_funcall(mrb, mrb_obj_value(mrb_class_real(c->super)), "inherited", 1, mrb_obj_value(c));

return c;

}

mrb_bool

mrb_class_defined(mrb_state *mrb, const char *name)

{

mrb_value sym = mrb_check_intern_cstr(mrb, name);

if (mrb_nil_p(sym)) {

return FALSE;

}

return mrb_const_defined(mrb, mrb_obj_value(mrb->object_class), mrb_symbol(sym));

}

struct RClass *

mrb_class_get_under(mrb_state *mrb, struct RClass *outer, const char *name)

{

return class_from_sym(mrb, outer, mrb_intern_cstr(mrb, name));

}

struct RClass *

mrb_class_get(mrb_state *mrb, const char *name)

{

return mrb_class_get_under(mrb, mrb->object_class, name);

}

struct RClass *

mrb_module_get_under(mrb_state *mrb, struct RClass *outer, const char *name)

{

return module_from_sym(mrb, outer, mrb_intern_cstr(mrb, name));

}

struct RClass *

mrb_module_get(mrb_state *mrb, const char *name)

{

return mrb_module_get_under(mrb, mrb->object_class, name);

}

/*!

* Defines a class under the namespace of \a outer.

* \param outer a class which contains the new class.

* \param id name of the new class

* \param super a class from which the new class will derive.

* NULL means \c Object class.

* \return the created class

* \throw TypeError if the constant name \a name is already taken but

* the constant is not a \c Class.

* \throw NameError if the class is already defined but the class can not

* be reopened because its superclass is not \a super.

* \post top-level constant named \a name refers the returned class.

* \note if a class named \a name is already defined and its superclass is

* \a super, the function just returns the defined class.

struct RClass *

mrb_define_class_under(mrb_state *mrb, struct RClass *outer, const char *name, struct RClass *super)

{

mrb_sym id = mrb_intern_cstr(mrb, name);

struct RClass * c;

#if 0

if (!super) {

mrb_warn(mrb, "no super class for `%S::%S', Object assumed",

mrb_obj_value(outer), mrb_sym2str(mrb, id));

}

#endif

c = define_class(mrb, id, super, outer);

setup_class(mrb, outer, c, id);

return c;

}

void

mrb_define_method_raw(mrb_state *mrb, struct RClass *c, mrb_sym mid, struct RProc *p)

{

khash_t(mt) *h = c->mt;

khiter_t k;

if (!h) h = c->mt = kh_init(mt, mrb);

k = kh_put(mt, mrb, h, mid);

kh_value(h, k) = p;

if (p) {

mrb_field_write_barrier(mrb, (struct RBasic *)c, (struct RBasic *)p);

}

void

mrb_define_method_id(mrb_state *mrb, struct RClass *c, mrb_sym mid, mrb_func_t func, mrb_aspec aspec)

{

struct RProc *p;

int ai = mrb_gc_arena_save(mrb);

p = mrb_proc_new_cfunc(mrb, func);

p->target_class = c;

mrb_define_method_raw(mrb, c, mid, p);

mrb_gc_arena_restore(mrb, ai);

}

void

mrb_define_method(mrb_state *mrb, struct RClass *c, const char *name, mrb_func_t func, mrb_aspec aspec)

{

mrb_define_method_id(mrb, c, mrb_intern_cstr(mrb, name), func, aspec);

}

void

mrb_define_method_vm(mrb_state *mrb, struct RClass *c, mrb_sym name, mrb_value body)

{

khash_t(mt) *h = c->mt;

khiter_t k;

struct RProc *p;

if (!h) h = c->mt = kh_init(mt, mrb);

k = kh_put(mt, mrb, h, name);

p = mrb_proc_ptr(body);

kh_value(h, k) = p;

if (p) {

mrb_field_write_barrier(mrb, (struct RBasic *)c, (struct RBasic *)p);

}

static mrb_value

check_type(mrb_state *mrb, mrb_value val, enum mrb_vtype t, const char *c, const char *m)

{

mrb_value tmp;

tmp = mrb_check_convert_type(mrb, val, t, c, m);

if (mrb_nil_p(tmp)) {

mrb_raisef(mrb, E_TYPE_ERROR, "expected %S", mrb_str_new_cstr(mrb, c));

}

return tmp;

}

static mrb_value

to_str(mrb_state *mrb, mrb_value val)

{

return check_type(mrb, val, MRB_TT_STRING, "String", "to_str");

}

static mrb_value

to_ary(mrb_state *mrb, mrb_value val)

{

return check_type(mrb, val, MRB_TT_ARRAY, "Array", "to_ary");

}

static mrb_value

to_hash(mrb_state *mrb, mrb_value val)

{

return check_type(mrb, val, MRB_TT_HASH, "Hash", "to_hash");

}

retrieve arguments from mrb_state.

mrb_get_args(mrb, format, ...)

returns number of arguments parsed.

format specifiers:

string mruby type C type note

----------------------------------------------------------------------------------------------

o: Object [mrb_value]

C: class/module [mrb_value]

S: String [mrb_value]

A: Array [mrb_value]

H: Hash [mrb_value]

s: String [char*,int] Receive two arguments.

z: String [char*] NUL terminated string.

a: Array [mrb_value*,mrb_int] Receive two arguments.

f: Float [mrb_float]

i: Integer [mrb_int]

b: Boolean [mrb_bool]

n: Symbol [mrb_sym]

d: Data [void*,mrb_data_type const] 2nd argument will be used to check data type so it won't be modified

&: Block [mrb_value]

*: rest argument [mrb_value*,int] Receive the rest of the arguments as an array.

|: optional Next argument of '|' and later are optional.

?: optional given [mrb_bool] true if preceding argument (optional) is given.

int

mrb_get_args(mrb_state *mrb, const char *format, ...)

{

char c;

int i = 0;

mrb_value *sp = mrb->c->stack + 1;

va_list ap;

int argc = mrb->c->ci->argc;

mrb_bool opt = 0;

mrb_bool given = 1;

va_start(ap, format);

if (argc < 0) {

struct RArray *a = mrb_ary_ptr(mrb->c->stack[1]);

argc = a->len;

sp = a->ptr;

}

while ((c = *format++)) {

switch (c) {

case '|': case '*': case '&': case '?':

break;

default:

if (argc <= i) {

if (opt) {

given = 0;

}

else {

mrb_raise(mrb, E_ARGUMENT_ERROR, "wrong number of arguments");

}

break;

}

switch (c) {

case 'o':

{

mrb_value *p;

p = va_arg(ap, mrb_value*);

if (i < argc) {

*p = *sp++;

i++;

}

break;

case 'C':

{

mrb_value *p;

p = va_arg(ap, mrb_value*);

if (i < argc) {

mrb_value ss;

ss = *sp++;

switch (mrb_type(ss)) {

case MRB_TT_CLASS:

case MRB_TT_MODULE:

case MRB_TT_SCLASS:

break;

default:

mrb_raisef(mrb, E_TYPE_ERROR, "%S is not class/module", ss);

break;

}

*p = ss;

i++;

}

break;

case 'S':

{

mrb_value *p;

p = va_arg(ap, mrb_value*);

if (i < argc) {

*p = to_str(mrb, *sp++);

i++;

}

break;

case 'A':

{

mrb_value *p;

p = va_arg(ap, mrb_value*);

if (i < argc) {

*p = to_ary(mrb, *sp++);

i++;

}

break;

case 'H':

{

mrb_value *p;

p = va_arg(ap, mrb_value*);

if (i < argc) {

*p = to_hash(mrb, *sp++);

i++;

}

break;

case 's':

{

mrb_value ss;

char **ps = 0;

int *pl = 0;

ps = va_arg(ap, char**);

pl = va_arg(ap, int*);

if (i < argc) {

ss = to_str(mrb, *sp++);

*ps = RSTRING_PTR(ss);

*pl = RSTRING_LEN(ss);

i++;

}

break;

case 'z':

{

mrb_value ss;

char **ps;

ps = va_arg(ap, char**);

if (i < argc) {

ss = to_str(mrb, *sp++);

*ps = mrb_string_value_cstr(mrb, &ss);

i++;

}

break;

case 'a':

{

mrb_value aa;

struct RArray *a;

mrb_value **pb;

mrb_int *pl;

pb = va_arg(ap, mrb_value**);

pl = va_arg(ap, mrb_int*);

if (i < argc) {

aa = to_ary(mrb, *sp++);

a = mrb_ary_ptr(aa);

*pb = a->ptr;

*pl = a->len;

i++;

}

break;

case 'f':

{

mrb_float *p;

p = va_arg(ap, mrb_float*);

if (i < argc) {

switch (mrb_type(*sp)) {

case MRB_TT_FLOAT:

*p = mrb_float(*sp);

break;

case MRB_TT_FIXNUM:

*p = (mrb_float)mrb_fixnum(*sp);

break;

case MRB_TT_STRING:

mrb_raise(mrb, E_TYPE_ERROR, "String can't be coerced into Float");

break;

default:

{

mrb_value tmp;

tmp = mrb_convert_type(mrb, *sp, MRB_TT_FLOAT, "Float", "to_f");

*p = mrb_float(tmp);

}

break;

}

sp++;

i++;

}

break;

case 'i':

{

mrb_int *p;

p = va_arg(ap, mrb_int*);

if (i < argc) {

switch (mrb_type(*sp)) {

case MRB_TT_FIXNUM:

*p = mrb_fixnum(*sp);

break;

case MRB_TT_FLOAT:

{

mrb_float f = mrb_float(*sp);

if (!FIXABLE(f)) {

mrb_raise(mrb, E_RANGE_ERROR, "float too big for int");

}

*p = (mrb_int)f;

}

break;

default:

*p = mrb_fixnum(mrb_Integer(mrb, *sp));

break;

}

sp++;

i++;

}

break;

case 'b':

{

mrb_bool *boolp = va_arg(ap, mrb_bool*);

if (i < argc) {

mrb_value b = *sp++;

*boolp = mrb_test(b);

i++;

}

break;

case 'n':

{

mrb_sym *symp;

symp = va_arg(ap, mrb_sym*);

if (i < argc) {

mrb_value ss;

ss = *sp++;

if (mrb_type(ss) == MRB_TT_SYMBOL) {

*symp = mrb_symbol(ss);

}

else if (mrb_string_p(ss)) {

*symp = mrb_intern_str(mrb, to_str(mrb, ss));

}

else {

mrb_value obj = mrb_funcall(mrb, ss, "inspect", 0);

mrb_raisef(mrb, E_TYPE_ERROR, "%S is not a symbol", obj);

}

i++;

}

break;

case 'd':

{

void** datap;

struct mrb_data_type const* type;

datap = va_arg(ap, void**);

type = va_arg(ap, struct mrb_data_type const*);

if (i < argc) {

*datap = mrb_data_get_ptr(mrb, *sp++, type);

++i;

}

break;

case '&':

{

mrb_value *p, *bp;

p = va_arg(ap, mrb_value*);

if (mrb->c->ci->argc < 0) {

bp = mrb->c->stack + 2;

}

else {

bp = mrb->c->stack + mrb->c->ci->argc + 1;

}

*p = *bp;

}

break;

case '|':

opt = 1;

break;

case '?':

{

mrb_bool *p;

p = va_arg(ap, mrb_bool*);

*p = given;

}

break;

case '*':

{

mrb_value **var;

int *pl;

var = va_arg(ap, mrb_value**);

pl = va_arg(ap, int*);

if (argc > i) {

*pl = argc-i;

if (*pl > 0) {

*var = sp;

}

i = argc;

sp += *pl;

}

else {

*pl = 0;

*var = NULL;

}

break;

default:

mrb_raisef(mrb, E_ARGUMENT_ERROR, "invalid argument specifier %S", mrb_str_new(mrb, &c, 1));

break;

}

if (!c && argc > i) {

mrb_raise(mrb, E_ARGUMENT_ERROR, "wrong number of arguments");

}

va_end(ap);

return i;

}

static struct RClass*

boot_defclass(mrb_state *mrb, struct RClass *super)

{

struct RClass *c;

c = (struct RClass*)mrb_obj_alloc(mrb, MRB_TT_CLASS, mrb->class_class);

if (super) {

c->super = super;

mrb_field_write_barrier(mrb, (struct RBasic*)c, (struct RBasic*)super);

}

else {

c->super = mrb->object_class;

}

c->mt = kh_init(mt, mrb);

return c;

}

void

mrb_include_module(mrb_state *mrb, struct RClass *c, struct RClass *m)

{

struct RClass *ins_pos;

ins_pos = c;

while (m) {

struct RClass *p = c, *ic;

int superclass_seen = 0;

if (c->mt == m->mt) {

mrb_raise(mrb, E_ARGUMENT_ERROR, "cyclic include detected");

}

while (p) {

if (c != p && p->tt == MRB_TT_CLASS) {

superclass_seen = 1;

}

else if (p->mt == m->mt){

if (p->tt == MRB_TT_ICLASS && !superclass_seen) {

ins_pos = p;

}

goto skip;

}

p = p->super;

}

ic = (struct RClass*)mrb_obj_alloc(mrb, MRB_TT_ICLASS, mrb->class_class);

if (m->tt == MRB_TT_ICLASS) {

ic->c = m->c;

}

else {

ic->c = m;

}

ic->mt = m->mt;

ic->iv = m->iv;

ic->super = ins_pos->super;

ins_pos->super = ic;

mrb_field_write_barrier(mrb, (struct RBasic*)ins_pos, (struct RBasic*)ic);

ins_pos = ic;

skip:

m = m->super;

}

static mrb_value

mrb_mod_append_features(mrb_state *mrb, mrb_value mod)

{

mrb_value klass;

mrb_check_type(mrb, mod, MRB_TT_MODULE);

mrb_get_args(mrb, "C", &klass);

mrb_include_module(mrb, mrb_class_ptr(klass), mrb_class_ptr(mod));

return mod;

}

static mrb_value

mrb_mod_include(mrb_state *mrb, mrb_value klass)

{

mrb_value *argv;

int argc, i;

mrb_get_args(mrb, "*", &argv, &argc);

for (i=0; i<argc; i++) {

mrb_check_type(mrb, argv[i], MRB_TT_MODULE);

}

while (argc--) {

mrb_funcall(mrb, argv[argc], "append_features", 1, klass);

mrb_funcall(mrb, argv[argc], "included", 1, klass);

}

return klass;

}

/* 15.2.2.4.28 */

* call-seq:

* mod.include?(module) -> true or false

* Returns <code>true</code> if module is included in

* mod or one of mod's ancestors.

* module A

* end

* class B

* include A

* end

* class C < B

* end

* B.include?(A) #=> true

* C.include?(A) #=> true

* A.include?(A) #=> false

static mrb_value

mrb_mod_include_p(mrb_state *mrb, mrb_value mod)

{

mrb_value mod2;

struct RClass *c = mrb_class_ptr(mod);

mrb_get_args(mrb, "C", &mod2);

mrb_check_type(mrb, mod2, MRB_TT_MODULE);

while (c) {

if (c->tt == MRB_TT_ICLASS) {

if (c->c == mrb_class_ptr(mod2)) return mrb_true_value();

}

c = c->super;

}

return mrb_false_value();

}

static mrb_value

mrb_mod_ancestors(mrb_state *mrb, mrb_value self)

{

mrb_value result;

struct RClass *c = mrb_class_ptr(self);

result = mrb_ary_new(mrb);

mrb_ary_push(mrb, result, mrb_obj_value(c));

c = c->super;

while (c) {

if (c->tt == MRB_TT_ICLASS) {

mrb_ary_push(mrb, result, mrb_obj_value(c->c));

}

else if (c->tt != MRB_TT_SCLASS) {

mrb_ary_push(mrb, result, mrb_obj_value(c));

}

c = c->super;

}

return result;

}

static mrb_value

mrb_mod_extend_object(mrb_state *mrb, mrb_value mod)

{

mrb_value obj;

mrb_check_type(mrb, mod, MRB_TT_MODULE);

mrb_get_args(mrb, "o", &obj);

mrb_include_module(mrb, mrb_class_ptr(mrb_singleton_class(mrb, obj)), mrb_class_ptr(mod));

return mod;

}

static mrb_value

mrb_mod_included_modules(mrb_state *mrb, mrb_value self)

{

mrb_value result;

struct RClass *c = mrb_class_ptr(self);

result = mrb_ary_new(mrb);

while (c) {

if (c->tt == MRB_TT_ICLASS) {

mrb_ary_push(mrb, result, mrb_obj_value(c->c));

}

c = c->super;

}

return result;

}

mrb_value mrb_class_instance_method_list(mrb_state*, mrb_bool, struct RClass*, int);

/* 15.2.2.4.33 */

* call-seq:

* mod.instance_methods(include_super=true) -> array

* Returns an array containing the names of the public and protected instance

* methods in the receiver. For a module, these are the public and protected methods;

* for a class, they are the instance (not singleton) methods. With no

* argument, or with an argument that is <code>false</code>, the

* instance methods in mod are returned, otherwise the methods

* in mod and mod's superclasses are returned.

* module A

* def method1() end

* end

* class B

* def method2() end

* end

* class C < B

* def method3() end

* end

* A.instance_methods #=> [:method1]

* B.instance_methods(false) #=> [:method2]

* C.instance_methods(false) #=> [:method3]

* C.instance_methods(true).length #=> 43

static mrb_value

mrb_mod_instance_methods(mrb_state *mrb, mrb_value mod)

{

struct RClass *c = mrb_class_ptr(mod);

mrb_bool recur = TRUE;

mrb_get_args(mrb, "|b", &recur);

return mrb_class_instance_method_list(mrb, recur, c, 0);

}

mrb_value mrb_yield_internal(mrb_state *mrb, mrb_value b, int argc, mrb_value *argv, mrb_value self, struct RClass *c);

/* 15.2.2.4.35 */

* call-seq:

* mod.class_eval {| | block } -> obj

* mod.module_eval {| | block } -> obj

* Evaluates block in the context of _mod_. This can

* be used to add methods to a class. <code>module_eval</code> returns

* the result of evaluating its argument.

mrb_value

mrb_mod_module_eval(mrb_state *mrb, mrb_value mod)

{

mrb_value a, b;

struct RClass *c;

if (mrb_get_args(mrb, "|S&", &a, &b) == 1) {

mrb_raise(mrb, E_NOTIMP_ERROR, "module_eval/class_eval with string not implemented");

}

c = mrb_class_ptr(mod);

return mrb_yield_internal(mrb, b, 0, 0, mod, c);

}

mrb_value

mrb_mod_dummy_visibility(mrb_state *mrb, mrb_value mod)

{

return mod;

}

mrb_value

mrb_singleton_class(mrb_state *mrb, mrb_value v)

{

struct RBasic *obj;

switch (mrb_type(v)) {

case MRB_TT_FALSE:

if (mrb_nil_p(v))

return mrb_obj_value(mrb->nil_class);

return mrb_obj_value(mrb->false_class);

case MRB_TT_TRUE:

return mrb_obj_value(mrb->true_class);

case MRB_TT_CPTR:

return mrb_obj_value(mrb->object_class);

case MRB_TT_SYMBOL:

case MRB_TT_FIXNUM:

case MRB_TT_FLOAT:

mrb_raise(mrb, E_TYPE_ERROR, "can't define singleton");

return mrb_nil_value(); /* not reached */

default:

break;

}

obj = mrb_basic_ptr(v);

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mruby/src/class.c at master · tmash06/mruby · GitHub

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