mruby/src/kernel.c at master · drjolo/mruby · GitHub

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** kernel.c - Kernel module

** See Copyright Notice in mruby.h

#include "mruby.h"

#include "mruby/array.h"

#include "mruby/class.h"

#include "mruby/proc.h"

#include "mruby/string.h"

#include "mruby/variable.h"

#include "error.h"

typedef enum {

NOEX_PUBLIC = 0x00,

NOEX_NOSUPER = 0x01,

NOEX_PRIVATE = 0x02,

NOEX_PROTECTED = 0x04,

NOEX_MASK = 0x06,

NOEX_BASIC = 0x08,

NOEX_UNDEF = NOEX_NOSUPER,

NOEX_MODFUNC = 0x12,

NOEX_SUPER = 0x20,

NOEX_VCALL = 0x40,

NOEX_RESPONDS = 0x80

} mrb_method_flag_t;

int

mrb_obj_basic_to_s_p(mrb_state *mrb, mrb_value obj)

{

struct RProc *me = mrb_method_search(mrb, mrb_class(mrb, obj), mrb_intern2(mrb, "to_s", 4));

if (me && MRB_PROC_CFUNC_P(me) && (me->body.func == mrb_any_to_s))

return TRUE;

return FALSE;

}

/* 15.3.1.3.17 */

* call-seq:

* obj.inspect -> string

* Returns a string containing a human-readable representation of

* obj. If not overridden and no instance variables, uses the

* <code>to_s</code> method to generate the string.

* obj. If not overridden, uses the <code>to_s</code> method to

* generate the string.

* [ 1, 2, 3..4, 'five' ].inspect #=> "[1, 2, 3..4, \"five\"]"

* Time.new.inspect #=> "2008-03-08 19:43:39 +0900"

mrb_value

mrb_obj_inspect(mrb_state *mrb, mrb_value obj)

{

if ((mrb_type(obj) == MRB_TT_OBJECT) && mrb_obj_basic_to_s_p(mrb, obj)) {

return mrb_obj_iv_inspect(mrb, mrb_obj_ptr(obj));

}

return mrb_any_to_s(mrb, obj);

}

/* 15.3.1.3.1 */

/* 15.3.1.3.10 */

/* 15.3.1.3.11 */

* call-seq:

* obj == other -> true or false

* obj.equal?(other) -> true or false

* obj.eql?(other) -> true or false

* Equality---At the <code>Object</code> level, <code>==</code> returns

* <code>true</code> only if obj and other are the

* same object. Typically, this method is overridden in descendant

* classes to provide class-specific meaning.

* Unlike <code>==</code>, the <code>equal?</code> method should never be

* overridden by subclasses: it is used to determine object identity

* (that is, <code>a.equal?(b)</code> iff <code>a</code> is the same

* object as <code>b</code>).

* The <code>eql?</code> method returns <code>true</code> if

* obj and anObject have the same value. Used by

* <code>Hash</code> to test members for equality. For objects of

* class <code>Object</code>, <code>eql?</code> is synonymous with

* <code>==</code>. Subclasses normally continue this tradition, but

* there are exceptions. <code>Numeric</code> types, for example,

* perform type conversion across <code>==</code>, but not across

* <code>eql?</code>, so:

* 1 == 1.0 #=> true

* 1.eql? 1.0 #=> false

static mrb_value

mrb_obj_equal_m(mrb_state *mrb, mrb_value self)

{

mrb_value arg;

mrb_bool eql_p;

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

eql_p = mrb_obj_equal(mrb, self, arg);

return mrb_bool_value(eql_p);

}

static mrb_value

mrb_obj_not_equal_m(mrb_state *mrb, mrb_value self)

{

mrb_value arg;

mrb_bool eql_p;

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

eql_p = mrb_equal(mrb, self, arg);

return mrb_bool_value(!eql_p);

}

/* 15.3.1.3.2 */

* call-seq:

* obj === other -> true or false

* Case Equality---For class <code>Object</code>, effectively the same

* as calling <code>#==</code>, but typically overridden by descendants

* to provide meaningful semantics in <code>case</code> statements.

static mrb_value

mrb_equal_m(mrb_state *mrb, mrb_value self)

{

mrb_value arg;

mrb_bool equal_p;

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

equal_p = mrb_equal(mrb, self, arg);

return mrb_bool_value(equal_p);

}

/* 15.3.1.3.3 */

/* 15.3.1.3.33 */

* Document-method: __id__

* Document-method: object_id

* call-seq:

* obj.__id__ -> fixnum

* obj.object_id -> fixnum

* Returns an integer identifier for obj. The same number will

* be returned on all calls to <code>id</code> for a given object, and

* no two active objects will share an id.

* <code>Object#object_id</code> is a different concept from the

* <code>:name</code> notation, which returns the symbol id of

* <code>name</code>. Replaces the deprecated <code>Object#id</code>.

static mrb_value

mrb_obj_id_m(mrb_state *mrb, mrb_value self)

{

return mrb_fixnum_value(mrb_obj_id(self));

}

/* 15.3.1.3.4 */

/* 15.3.1.3.44 */

* call-seq:

* obj.send(symbol [, args...]) -> obj

* obj.__send__(symbol [, args...]) -> obj

* Invokes the method identified by _symbol_, passing it any

* arguments specified. You can use <code>__send__</code> if the name

* +send+ clashes with an existing method in _obj_.

* class Klass

* def hello(*args)

* "Hello " + args.join(' ')

* end

* k = Klass.new

* k.send :hello, "gentle", "readers" #=> "Hello gentle readers"

static mrb_value

mrb_f_send(mrb_state *mrb, mrb_value self)

{

mrb_sym name;

mrb_value block, *argv;

int argc;

mrb_get_args(mrb, "n*&", &name, &argv, &argc, &block);

return mrb_funcall_with_block(mrb,self, name, argc, argv, block);

}

/* 15.3.1.2.2 */

/* 15.3.1.2.5 */

/* 15.3.1.3.6 */

/* 15.3.1.3.25 */

* call-seq:

* block_given? -> true or false

* iterator? -> true or false

* Returns <code>true</code> if <code>yield</code> would execute a

* block in the current context. The <code>iterator?</code> form

* is mildly deprecated.

* def try

* if block_given?

* yield

* else

* "no block"

* end

* try #=> "no block"

* try { "hello" } #=> "hello"

* try do "hello" end #=> "hello"

static mrb_value

mrb_f_block_given_p_m(mrb_state *mrb, mrb_value self)

{

mrb_callinfo *ci = mrb->ci;

mrb_value *bp;

mrb_bool given_p;

bp = mrb->stbase + ci->stackidx + 1;

ci--;

if (ci <= mrb->cibase) {

given_p = 0;

}

else {

/* block_given? called within block; check upper scope */

if (ci->proc->env && ci->proc->env->stack) {

given_p = !(ci->proc->env->stack == mrb->stbase ||

mrb_nil_p(ci->proc->env->stack[1]));

}

else {

if (ci->argc > 0) {

bp += ci->argc;

}

given_p = !mrb_nil_p(*bp);

}

return mrb_bool_value(given_p);

}

/* 15.3.1.3.7 */

* call-seq:

* obj.class -> class

* Returns the class of obj. This method must always be

* called with an explicit receiver, as <code>class</code> is also a

* reserved word in Ruby.

* 1.class #=> Fixnum

* self.class #=> Object

static mrb_value

mrb_obj_class_m(mrb_state *mrb, mrb_value self)

{

return mrb_obj_value(mrb_obj_class(mrb, self));

}

struct RClass*

mrb_singleton_class_clone(mrb_state *mrb, mrb_value obj)

{

struct RClass *klass = mrb_basic_ptr(obj)->c;

if (klass->tt != MRB_TT_SCLASS)

return klass;

else {

/* copy singleton(unnamed) class */

struct RClass *clone = (struct RClass*)mrb_obj_alloc(mrb, klass->tt, mrb->class_class);

if ((mrb_type(obj) == MRB_TT_CLASS) ||

(mrb_type(obj) == MRB_TT_SCLASS)) { /* BUILTIN_TYPE(obj) == T_CLASS */

clone->c = clone;

}

else {

clone->c = mrb_singleton_class_clone(mrb, mrb_obj_value(klass));

}

clone->super = klass->super;

if (klass->iv) {

mrb_iv_copy(mrb, mrb_obj_value(clone), mrb_obj_value(klass));

mrb_obj_iv_set(mrb, (struct RObject*)clone, mrb_intern2(mrb, "__attached__", 12), obj);

}

if (klass->mt) {

clone->mt = kh_copy(mt, mrb, klass->mt);

}

else {

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

}

clone->tt = MRB_TT_SCLASS;

return clone;

}

static void

init_copy(mrb_state *mrb, mrb_value dest, mrb_value obj)

{

switch (mrb_type(obj)) {

case MRB_TT_OBJECT:

case MRB_TT_CLASS:

case MRB_TT_MODULE:

case MRB_TT_SCLASS:

case MRB_TT_HASH:

case MRB_TT_DATA:

mrb_iv_copy(mrb, dest, obj);

break;

default:

break;

}

mrb_funcall(mrb, dest, "initialize_copy", 1, obj);

}

/* 15.3.1.3.8 */

* call-seq:

* obj.clone -> an_object

* Produces a shallow copy of obj---the instance variables of

* obj are copied, but not the objects they reference. Copies

* the frozen state of obj. See also the discussion

* under <code>Object#dup</code>.

* class Klass

* attr_accessor :str

* end

* s1 = Klass.new #=> #<Klass:0x401b3a38>

* s1.str = "Hello" #=> "Hello"

* s2 = s1.clone #=> #<Klass:0x401b3998 @str="Hello">

* s2.str[1,4] = "i" #=> "i"

* s1.inspect #=> "#<Klass:0x401b3a38 @str=\"Hi\">"

* s2.inspect #=> "#<Klass:0x401b3998 @str=\"Hi\">"

* This method may have class-specific behavior. If so, that

* behavior will be documented under the #+initialize_copy+ method of

* the class.

* Some Class(True False Nil Symbol Fixnum Float) Object cannot clone.

mrb_value

mrb_obj_clone(mrb_state *mrb, mrb_value self)

{

struct RObject *p;

mrb_value clone;

if (mrb_special_const_p(self)) {

mrb_raisef(mrb, E_TYPE_ERROR, "can't clone %S", self);

}

p = (struct RObject*)mrb_obj_alloc(mrb, mrb_type(self), mrb_obj_class(mrb, self));

p->c = mrb_singleton_class_clone(mrb, self);

clone = mrb_obj_value(p);

init_copy(mrb, clone, self);

return clone;

}

/* 15.3.1.3.9 */

* call-seq:

* obj.dup -> an_object

* Produces a shallow copy of obj---the instance variables of

* obj are copied, but not the objects they reference.

* <code>dup</code> copies the frozen state of obj. See also

* the discussion under <code>Object#clone</code>. In general,

* <code>clone</code> and <code>dup</code> may have different semantics

* in descendant classes. While <code>clone</code> is used to duplicate

* an object, including its internal state, <code>dup</code> typically

* uses the class of the descendant object to create the new instance.

* This method may have class-specific behavior. If so, that

* behavior will be documented under the #+initialize_copy+ method of

* the class.

mrb_value

mrb_obj_dup(mrb_state *mrb, mrb_value obj)

{

struct RBasic *p;

mrb_value dup;

if (mrb_special_const_p(obj)) {

mrb_raisef(mrb, E_TYPE_ERROR, "can't dup %S", obj);

}

p = mrb_obj_alloc(mrb, mrb_type(obj), mrb_obj_class(mrb, obj));

dup = mrb_obj_value(p);

init_copy(mrb, dup, obj);

return dup;

}

static mrb_value

mrb_obj_extend(mrb_state *mrb, int argc, mrb_value *argv, mrb_value obj)

{

int i;

if (argc == 0) {

mrb_raise(mrb, E_ARGUMENT_ERROR, "wrong number of arguments (at least 1)");

}

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

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

}

while (argc--) {

mrb_funcall(mrb, argv[argc], "extend_object", 1, obj);

mrb_funcall(mrb, argv[argc], "extended", 1, obj);

}

return obj;

}

/* 15.3.1.3.13 */

* call-seq:

* obj.extend(module, ...) -> obj

* Adds to _obj_ the instance methods from each module given as a

* parameter.

* module Mod

* def hello

* "Hello from Mod.\n"

* end

* class Klass

* def hello

* "Hello from Klass.\n"

* end

* k = Klass.new

* k.hello #=> "Hello from Klass.\n"

* k.extend(Mod) #=> #<Klass:0x401b3bc8>

* k.hello #=> "Hello from Mod.\n"

mrb_value

mrb_obj_extend_m(mrb_state *mrb, mrb_value self)

{

mrb_value *argv;

int argc;

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

return mrb_obj_extend(mrb, argc, argv, self);

}

/* 15.3.1.3.15 */

* call-seq:

* obj.hash -> fixnum

* Generates a <code>Fixnum</code> hash value for this object. This

* function must have the property that <code>a.eql?(b)</code> implies

* <code>a.hash == b.hash</code>. The hash value is used by class

* <code>Hash</code>. Any hash value that exceeds the capacity of a

* <code>Fixnum</code> will be truncated before being used.

mrb_value

mrb_obj_hash(mrb_state *mrb, mrb_value self)

{

return mrb_fixnum_value(mrb_obj_id(self));

}

/* 15.3.1.3.16 */

mrb_value

mrb_obj_init_copy(mrb_state *mrb, mrb_value self)

{

mrb_value orig;

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

if (mrb_obj_equal(mrb, self, orig)) return self;

if ((mrb_type(self) != mrb_type(orig)) || (mrb_obj_class(mrb, self) != mrb_obj_class(mrb, orig))) {

mrb_raise(mrb, E_TYPE_ERROR, "initialize_copy should take same class object");

}

return self;

}

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

/* 15.3.1.3.18 */

* call-seq:

* obj.instance_eval {| | block } -> obj

* Evaluates the given block,within the context of the receiver (_obj_).

* In order to set the context, the variable +self+ is set to _obj_ while

* the code is executing, giving the code access to _obj_'s

* instance variables. In the version of <code>instance_eval</code>

* that takes a +String+, the optional second and third

* parameters supply a filename and starting line number that are used

* when reporting compilation errors.

* class KlassWithSecret

* def initialize

* @secret = 99

* end

* k = KlassWithSecret.new

* k.instance_eval { @secret } #=> 99

mrb_value

mrb_obj_instance_eval(mrb_state *mrb, mrb_value self)

{

mrb_value a, b;

mrb_value cv;

struct RClass *c;

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

mrb_raise(mrb, E_NOTIMP_ERROR, "instance_eval with string not implemented");

}

switch (mrb_type(self)) {

case MRB_TT_SYMBOL:

case MRB_TT_FIXNUM:

case MRB_TT_FLOAT:

c = 0;

break;

default:

cv = mrb_singleton_class(mrb, self);

c = mrb_class_ptr(cv);

break;

}

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

}

int

mrb_obj_is_instance_of(mrb_state *mrb, mrb_value obj, struct RClass* c)

{

if (mrb_obj_class(mrb, obj) == c) return TRUE;

return FALSE;

}

/* 15.3.1.3.19 */

* call-seq:

* obj.instance_of?(class) -> true or false

* Returns <code>true</code> if obj is an instance of the given

* class. See also <code>Object#kind_of?</code>.

static mrb_value

obj_is_instance_of(mrb_state *mrb, mrb_value self)

{

mrb_value arg;

mrb_bool instance_of_p;

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

instance_of_p = mrb_obj_is_instance_of(mrb, self, mrb_class_ptr(arg));

return mrb_bool_value(instance_of_p);

}

static void

check_iv_name(mrb_state *mrb, mrb_sym id)

{

const char *s;

size_t len;

s = mrb_sym2name_len(mrb, id, &len);

if (len < 2 || !(s[0] == '@' && s[1] != '@')) {

mrb_name_error(mrb, id, "`%S' is not allowed as an instance variable name", mrb_sym2str(mrb, id));

}

/* 15.3.1.3.20 */

* call-seq:

* obj.instance_variable_defined?(symbol) -> true or false

* Returns <code>true</code> if the given instance variable is

* defined in obj.

* class Fred

* def initialize(p1, p2)

* @a, @b = p1, p2

* end

* fred = Fred.new('cat', 99)

* fred.instance_variable_defined?(:@a) #=> true

* fred.instance_variable_defined?("@b") #=> true

* fred.instance_variable_defined?("@c") #=> false

mrb_value

mrb_obj_ivar_defined(mrb_state *mrb, mrb_value self)

{

mrb_sym mid;

mrb_bool defined_p;

mrb_get_args(mrb, "n", &mid);

check_iv_name(mrb, mid);

defined_p = mrb_obj_iv_defined(mrb, mrb_obj_ptr(self), mid);

return mrb_bool_value(defined_p);

}

/* 15.3.1.3.21 */

* call-seq:

* obj.instance_variable_get(symbol) -> obj

* Returns the value of the given instance variable, or nil if the

* instance variable is not set. The <code>@</code> part of the

* variable name should be included for regular instance

* variables. Throws a <code>NameError</code> exception if the

* supplied symbol is not valid as an instance variable name.

* class Fred

* def initialize(p1, p2)

* @a, @b = p1, p2

* end

* fred = Fred.new('cat', 99)

* fred.instance_variable_get(:@a) #=> "cat"

* fred.instance_variable_get("@b") #=> 99

mrb_value

mrb_obj_ivar_get(mrb_state *mrb, mrb_value self)

{

mrb_sym id;

mrb_get_args(mrb, "n", &id);

check_iv_name(mrb, id);

return mrb_iv_get(mrb, self, id);

}

/* 15.3.1.3.22 */

* call-seq:

* obj.instance_variable_set(symbol, obj) -> obj

* Sets the instance variable names by symbol to

* object, thereby frustrating the efforts of the class's

* author to attempt to provide proper encapsulation. The variable

* did not have to exist prior to this call.

* class Fred

* def initialize(p1, p2)

* @a, @b = p1, p2

* end

* fred = Fred.new('cat', 99)

* fred.instance_variable_set(:@a, 'dog') #=> "dog"

* fred.instance_variable_set(:@c, 'cat') #=> "cat"

* fred.inspect #=> "#<Fred:0x401b3da8 @a=\"dog\", @b=99, @c=\"cat\">"

mrb_value

mrb_obj_ivar_set(mrb_state *mrb, mrb_value self)

{

mrb_sym id;

mrb_value val;

mrb_get_args(mrb, "no", &id, &val);

check_iv_name(mrb, id);

mrb_iv_set(mrb, self, id, val);

return val;

}

/* 15.3.1.3.24 */

/* 15.3.1.3.26 */

* call-seq:

* obj.is_a?(class) -> true or false

* obj.kind_of?(class) -> true or false

* Returns <code>true</code> if class is the class of

* obj, or if class is one of the superclasses of

* obj or modules included in obj.

* module M; end

* class A

* include M

* end

* class B < A; end

* class C < B; end

* b = B.new

* b.instance_of? A #=> false

* b.instance_of? B #=> true

* b.instance_of? C #=> false

* b.instance_of? M #=> false

* b.kind_of? A #=> true

* b.kind_of? B #=> true

* b.kind_of? C #=> false

* b.kind_of? M #=> true

mrb_value

mrb_obj_is_kind_of_m(mrb_state *mrb, mrb_value self)

{

mrb_value arg;

mrb_bool kind_of_p;

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

kind_of_p = mrb_obj_is_kind_of(mrb, self, mrb_class_ptr(arg));

return mrb_bool_value(kind_of_p);

}

static void

method_entry_loop(mrb_state *mrb, struct RClass* klass, mrb_value ary)

{

khint_t i;

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

if (!h) return;

for (i=0;i<kh_end(h);i++) {

if (kh_exist(h, i)) {

mrb_ary_push(mrb, ary, mrb_symbol_value(kh_key(h,i)));

}

mrb_value

class_instance_method_list(mrb_state *mrb, mrb_bool recur, struct RClass* klass, int obj)

{

mrb_value ary;

struct RClass* oldklass;

ary = mrb_ary_new(mrb);

oldklass = 0;

while (klass && (klass != oldklass)) {

method_entry_loop(mrb, klass, ary);

if ((klass->tt == MRB_TT_ICLASS) ||

(klass->tt == MRB_TT_SCLASS)) {

}

else {

if (!recur) break;

}

oldklass = klass;

klass = klass->super;

}

return ary;

}

mrb_value

mrb_obj_singleton_methods(mrb_state *mrb, mrb_bool recur, mrb_value obj)

{

mrb_value ary;

struct RClass* klass;

klass = mrb_class(mrb, obj);

ary = mrb_ary_new(mrb);

if (klass && (klass->tt == MRB_TT_SCLASS)) {

method_entry_loop(mrb, klass, ary);

klass = klass->super;

}

if (recur) {

while (klass && ((klass->tt == MRB_TT_SCLASS) || (klass->tt == MRB_TT_ICLASS))) {

method_entry_loop(mrb, klass, ary);

klass = klass->super;

}

return ary;

}

mrb_value

mrb_obj_methods(mrb_state *mrb, mrb_bool recur, mrb_value obj, mrb_method_flag_t flag)

{

if (recur)

return class_instance_method_list(mrb, recur, mrb_class(mrb, obj), 0);

else

return mrb_obj_singleton_methods(mrb, recur, obj);

}

/* 15.3.1.3.31 */

* call-seq:

* obj.methods -> array

* Returns a list of the names of methods publicly accessible in

* obj. This will include all the methods accessible in

* obj's ancestors.

* class Klass

* def kMethod()

* end

* k = Klass.new

* k.methods[0..9] #=> [:kMethod, :respond_to?, :nil?, :is_a?,

* # :class, :instance_variable_set,

* # :methods, :extend, :__send__, :instance_eval]

* k.methods.length #=> 42

mrb_value

mrb_obj_methods_m(mrb_state *mrb, mrb_value self)

{

mrb_bool recur = TRUE;

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

return mrb_obj_methods(mrb, recur, self, (mrb_method_flag_t)0); /* everything but private */

}

/* 15.3.1.3.32 */

* call_seq:

* nil.nil? -> true

* <anything_else>.nil? -> false

* Only the object nil responds <code>true</code> to <code>nil?</code>.

mrb_value

mrb_false(mrb_state *mrb, mrb_value self)

{

return mrb_false_value();

}

/* 15.3.1.3.36 */

* call-seq:

* obj.private_methods(all=true) -> array

* Returns the list of private methods accessible to obj. If

* the all parameter is set to <code>false</code>, only those methods

* in the receiver will be listed.

mrb_value

mrb_obj_private_methods(mrb_state *mrb, mrb_value self)

{

mrb_bool recur = TRUE;

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

return mrb_obj_methods(mrb, recur, self, NOEX_PRIVATE); /* private attribute not define */

}

/* 15.3.1.3.37 */

* call-seq:

* obj.protected_methods(all=true) -> array

* Returns the list of protected methods accessible to obj. If

* the all parameter is set to <code>false</code>, only those methods

* in the receiver will be listed.

mrb_value

mrb_obj_protected_methods(mrb_state *mrb, mrb_value self)

{

mrb_bool recur = TRUE;

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

return mrb_obj_methods(mrb, recur, self, NOEX_PROTECTED); /* protected attribute not define */

}

/* 15.3.1.3.38 */

* call-seq:

* obj.public_methods(all=true) -> array

* Returns the list of public methods accessible to obj. If

* the all parameter is set to <code>false</code>, only those methods

* in the receiver will be listed.

mrb_value

mrb_obj_public_methods(mrb_state *mrb, mrb_value self)

{

mrb_bool recur = TRUE;

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

return mrb_obj_methods(mrb, recur, self, NOEX_PUBLIC); /* public attribute not define */

}

/* 15.3.1.2.12 */

/* 15.3.1.3.40 */

* call-seq:

* raise

* raise(string)

* raise(exception [, string])

* With no arguments, raises a <code>RuntimeError</code>

* With a single +String+ argument, raises a

* +RuntimeError+ with the string as a message. Otherwise,

* the first parameter should be the name of an +Exception+

* class (or an object that returns an +Exception+ object when sent

* an +exception+ message). The optional second parameter sets the

* message associated with the exception, and the third parameter is an

* array of callback information. Exceptions are caught by the

* +rescue+ clause of <code>begin...end</code> blocks.

* raise "Failed to create socket"

* raise ArgumentError, "No parameters", caller

mrb_value

mrb_f_raise(mrb_state *mrb, mrb_value self)

{

mrb_value a[2], exc;

int argc;

argc = mrb_get_args(mrb, "|oo", &a[0], &a[1]);

switch (argc) {

case 0:

mrb_raise(mrb, E_RUNTIME_ERROR, "");

break;

case 1:

a[1] = mrb_check_string_type(mrb, a[0]);

if (!mrb_nil_p(a[1])) {

argc = 2;

a[0] = mrb_obj_value(E_RUNTIME_ERROR);

}

/* fall through */

default:

exc = mrb_make_exception(mrb, argc, a);

mrb_obj_iv_set(mrb, mrb_obj_ptr(exc), mrb_intern2(mrb, "lastpc", 6), mrb_voidp_value(mrb->ci->pc));

mrb_exc_raise(mrb, exc);

break;

}

return mrb_nil_value(); /* not reached */

}

/* 15.3.1.3.41 */

* call-seq:

* obj.remove_instance_variable(symbol) -> obj

* Removes the named instance variable from obj, returning that

* variable's value.

* class Dummy

* attr_reader :var

* def initialize

* @var = 99

* end

* def remove

* remove_instance_variable(:@var)

* end

* d = Dummy.new

* d.var #=> 99

* d.remove #=> 99

* d.var #=> nil

mrb_value

mrb_obj_remove_instance_variable(mrb_state *mrb, mrb_value self)

{

mrb_sym sym;

mrb_value val;

mrb_get_args(mrb, "n", &sym);

check_iv_name(mrb, sym);

val = mrb_iv_remove(mrb, self, sym);

if (mrb_undef_p(val)) {

mrb_name_error(mrb, sym, "instance variable %S not defined", mrb_sym2str(mrb, sym));

}

return val;

}

static inline int

basic_obj_respond_to(mrb_state *mrb, mrb_value obj, mrb_sym id, int pub)

{

return mrb_respond_to(mrb, obj, id);

}

/* 15.3.1.3.43 */

* call-seq:

* obj.respond_to?(symbol, include_private=false) -> true or false

* Returns +true+ if _obj_ responds to the given

* method. Private methods are included in the search only if the

* optional second parameter evaluates to +true+.

* If the method is not implemented,

* as Process.fork on Windows, File.lchmod on GNU/Linux, etc.,

* false is returned.

* If the method is not defined, <code>respond_to_missing?</code>

* method is called and the result is returned.

mrb_value

obj_respond_to(mrb_state *mrb, mrb_value self)

{

mrb_value *argv;

int argc;

mrb_value mid, priv;

mrb_sym id, rtm_id;

mrb_bool respond_to_p = TRUE;

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

mid = argv[0];

if (argc > 1) priv = argv[1];

else priv = mrb_nil_value();

if (mrb_symbol_p(mid)) {

id = mrb_symbol(mid);

}

else {

mrb_value tmp;

if (!mrb_string_p(mid)) {

tmp = mrb_check_string_type(mrb, mid);

if (mrb_nil_p(tmp)) {

tmp = mrb_inspect(mrb, mid);

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

}

tmp = mrb_check_intern_str(mrb, mid);

if (mrb_nil_p(tmp)) {

respond_to_p = FALSE;

}

else {

id = mrb_symbol(tmp);

}

if (respond_to_p) {

respond_to_p = basic_obj_respond_to(mrb, self, id, !mrb_test(priv));

}

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