Module: Marshal

Defined in:
marshal.c

Constant Summary collapse

MAJOR_VERSION =

major version

INT2FIX(MARSHAL_MAJOR)
MINOR_VERSION =

minor version

INT2FIX(MARSHAL_MINOR)

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.dump(obj[, anIO], limit = -1) ⇒ Object

Serializes obj and all descendant objects. If anIO is specified, the serialized data will be written to it, otherwise the data will be returned as a String. If limit is specified, the traversal of subobjects will be limited to that depth. If limit is negative, no checking of depth will be performed.

class Klass
  def initialize(str)
    @str = str
  end
  def say_hello
    @str
  end
end

(produces no output)

o = Klass.new("hello\n")
data = Marshal.dump(o)
obj = Marshal.load(data)
obj.say_hello  #=> "hello\n"

Marshal can't dump following objects:

  • anonymous Class/Module.

  • objects which are related to system (ex: Dir, File::Stat, IO, File, Socket and so on)

  • an instance of MatchData, Data, Method, UnboundMethod, Proc, Thread, ThreadGroup, Continuation

  • objects which define singleton methods


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# File 'marshal.c', line 1053

static VALUE
marshal_dump(int argc, VALUE *argv, VALUE _)
{
    VALUE obj, port, a1, a2;
    int limit = -1;

    port = Qnil;
    rb_scan_args(argc, argv, "12", &obj, &a1, &a2);
    if (argc == 3) {
	if (!NIL_P(a2)) limit = NUM2INT(a2);
	if (NIL_P(a1)) io_needed();
	port = a1;
    }
    else if (argc == 2) {
	if (FIXNUM_P(a1)) limit = FIX2INT(a1);
	else if (NIL_P(a1)) io_needed();
	else port = a1;
    }
    return rb_marshal_dump_limited(obj, port, limit);
}

.load(source[, proc]) ⇒ Object .restore(source[, proc]) ⇒ Object

Returns the result of converting the serialized data in source into a Ruby object (possibly with associated subordinate objects). source may be either an instance of IO or an object that responds to to_str. If proc is specified, each object will be passed to the proc, as the object is being deserialized.

Never pass untrusted data (including user supplied input) to this method. Please see the overview for further details.


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# File 'marshal.c', line 2099

static VALUE
marshal_load(int argc, VALUE *argv, VALUE _)
{
    VALUE port, proc;

    rb_check_arity(argc, 1, 2);
    port = argv[0];
    proc = argc > 1 ? argv[1] : Qnil;
    return rb_marshal_load_with_proc(port, proc);
}

.load(source[, proc]) ⇒ Object .restore(source[, proc]) ⇒ Object

Returns the result of converting the serialized data in source into a Ruby object (possibly with associated subordinate objects). source may be either an instance of IO or an object that responds to to_str. If proc is specified, each object will be passed to the proc, as the object is being deserialized.

Never pass untrusted data (including user supplied input) to this method. Please see the overview for further details.


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# File 'marshal.c', line 2099

static VALUE
marshal_load(int argc, VALUE *argv, VALUE _)
{
    VALUE port, proc;

    rb_check_arity(argc, 1, 2);
    port = argv[0];
    proc = argc > 1 ? argv[1] : Qnil;
    return rb_marshal_load_with_proc(port, proc);
}

Instance Method Details

#dump(obj[, anIO], limit = -1) ⇒ Object (private)

Serializes obj and all descendant objects. If anIO is specified, the serialized data will be written to it, otherwise the data will be returned as a String. If limit is specified, the traversal of subobjects will be limited to that depth. If limit is negative, no checking of depth will be performed.

class Klass
  def initialize(str)
    @str = str
  end
  def say_hello
    @str
  end
end

(produces no output)

o = Klass.new("hello\n")
data = Marshal.dump(o)
obj = Marshal.load(data)
obj.say_hello  #=> "hello\n"

Marshal can't dump following objects:

  • anonymous Class/Module.

  • objects which are related to system (ex: Dir, File::Stat, IO, File, Socket and so on)

  • an instance of MatchData, Data, Method, UnboundMethod, Proc, Thread, ThreadGroup, Continuation

  • objects which define singleton methods


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# File 'marshal.c', line 1053

static VALUE
marshal_dump(int argc, VALUE *argv, VALUE _)
{
    VALUE obj, port, a1, a2;
    int limit = -1;

    port = Qnil;
    rb_scan_args(argc, argv, "12", &obj, &a1, &a2);
    if (argc == 3) {
	if (!NIL_P(a2)) limit = NUM2INT(a2);
	if (NIL_P(a1)) io_needed();
	port = a1;
    }
    else if (argc == 2) {
	if (FIXNUM_P(a1)) limit = FIX2INT(a1);
	else if (NIL_P(a1)) io_needed();
	else port = a1;
    }
    return rb_marshal_dump_limited(obj, port, limit);
}

#load(source[, proc]) ⇒ Object (private) #restore(source[, proc]) ⇒ Object (private)

Returns the result of converting the serialized data in source into a Ruby object (possibly with associated subordinate objects). source may be either an instance of IO or an object that responds to to_str. If proc is specified, each object will be passed to the proc, as the object is being deserialized.

Never pass untrusted data (including user supplied input) to this method. Please see the overview for further details.


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# File 'marshal.c', line 2099

static VALUE
marshal_load(int argc, VALUE *argv, VALUE _)
{
    VALUE port, proc;

    rb_check_arity(argc, 1, 2);
    port = argv[0];
    proc = argc > 1 ? argv[1] : Qnil;
    return rb_marshal_load_with_proc(port, proc);
}

#load(source[, proc]) ⇒ Object (private) #restore(source[, proc]) ⇒ Object (private)

Returns the result of converting the serialized data in source into a Ruby object (possibly with associated subordinate objects). source may be either an instance of IO or an object that responds to to_str. If proc is specified, each object will be passed to the proc, as the object is being deserialized.

Never pass untrusted data (including user supplied input) to this method. Please see the overview for further details.


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# File 'marshal.c', line 2099

static VALUE
marshal_load(int argc, VALUE *argv, VALUE _)
{
    VALUE port, proc;

    rb_check_arity(argc, 1, 2);
    port = argv[0];
    proc = argc > 1 ? argv[1] : Qnil;
    return rb_marshal_load_with_proc(port, proc);
}