Core extension library

Rake extensions to Module.

A Module is a collection of methods and constants. The methods in a module may be instance methods or module methods. Instance methods appear as methods in a class when the module is included, module methods do not. Conversely, module methods may be called without creating an encapsulating object, while instance methods may not. (See Module#module_function)

In the descriptions that follow, the parameter sym refers to a symbol, which is either a quoted string or a Symbol (such as :name).

module Mod
  include Math
  CONST = 1
  def meth
    #  ...
  end
end
Mod.class              #=> Module
Mod.constants          #=> [:CONST, :PI, :E]
Mod.instance_methods   #=> [:meth]
Methods
#
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C
F
I
M
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P
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T
Y
Class Public methods
Module.constants → array Module.constants(inherited) → array

In the first form, returns an array of the names of all constants accessible from the point of call. This list includes the names of all modules and classes defined in the global scope.

Module.constants.first(4)
   # => [:ARGF, :ARGV, :ArgumentError, :Array]

Module.constants.include?(:SEEK_SET)   # => false

class IO
  Module.constants.include?(:SEEK_SET) # => true
end

The second form calls the instance method constants.

Source: show 

static VALUE
rb_mod_s_constants(int argc, VALUE *argv, VALUE mod)
{
    const NODE *cref = rb_vm_cref();
    VALUE klass;
    VALUE cbase = 0;
    void *data = 0;

    if (argc > 0 || mod != rb_cModule) {
        return rb_mod_constants(argc, argv, mod);
    }

    while (cref) {
        klass = cref->nd_clss;
        if (!(cref->flags & NODE_FL_CREF_PUSHED_BY_EVAL) &&
            !NIL_P(klass)) {
            data = rb_mod_const_at(cref->nd_clss, data);
            if (!cbase) {
                cbase = klass;
            }
        }
        cref = cref->nd_next;
    }

    if (cbase) {
        data = rb_mod_const_of(cbase, data);
    }
    return rb_const_list(data);
}
Module.nesting → array

Returns the list of Modules nested at the point of call.

module M1
  module M2
    $a = Module.nesting
  end
end
$a           #=> [M1::M2, M1]
$a[0].name   #=> "M1::M2"

Source: show 

static VALUE
rb_mod_nesting(void)
{
    VALUE ary = rb_ary_new();
    const NODE *cref = rb_vm_cref();

    while (cref && cref->nd_next) {
        VALUE klass = cref->nd_clss;
        if (!(cref->flags & NODE_FL_CREF_PUSHED_BY_EVAL) &&
            !NIL_P(klass)) {
            rb_ary_push(ary, klass);
        }
        cref = cref->nd_next;
    }
    return ary;
}
Module.new → mod Module.new {|mod| block } → mod

Creates a new anonymous module. If a block is given, it is passed the module object, and the block is evaluated in the context of this module using module_eval.

fred = Module.new do
  def meth1
    "hello"
  end
  def meth2
    "bye"
  end
end
a = "my string"
a.extend(fred)   #=> "my string"
a.meth1          #=> "hello"
a.meth2          #=> "bye"

Assign the module to a constant (name starting uppercase) if you want to treat it like a regular module.

Source: show 

static VALUE
rb_mod_initialize(VALUE module)
{
    if (rb_block_given_p()) {
        rb_mod_module_exec(1, &module, module);
    }
    return Qnil;
}
Instance Public methods
mod < other → true, false, or nil

Returns true if mod is a subclass of other. Returns nil if there's no relationship between the two. (Think of the relationship in terms of the class definition: “class A<B” implies “A<B”).

Source: show 

static VALUE
rb_mod_lt(VALUE mod, VALUE arg)
{
    if (mod == arg) return Qfalse;
    return rb_class_inherited_p(mod, arg);
}
mod <= other → true, false, or nil

Returns true if mod is a subclass of other or is the same as other. Returns nil if there's no relationship between the two. (Think of the relationship in terms of the class definition: “class A<B” implies “A<B”).

Source: show 

VALUE
rb_class_inherited_p(VALUE mod, VALUE arg)
{
    VALUE start = mod;

    if (mod == arg) return Qtrue;
    if (!CLASS_OR_MODULE_P(arg) && !RB_TYPE_P(arg, T_ICLASS)) {
        rb_raise(rb_eTypeError, "compared with non class/module");
    }
    arg = RCLASS_ORIGIN(arg);
    while (mod) {
        if (RCLASS_M_TBL(mod) == RCLASS_M_TBL(arg))
            return Qtrue;
        mod = RCLASS_SUPER(mod);
    }
    /* not mod < arg; check if mod > arg */
    while (arg) {
        if (RCLASS_M_TBL(arg) == RCLASS_M_TBL(start))
            return Qfalse;
        arg = RCLASS_SUPER(arg);
    }
    return Qnil;
}
module <=> other_module → -1, 0, +1, or nil

Comparison—Returns -1, 0, +1 or nil depending on whether module includes other_module, they are the same, or if module is included by other_module. This is the basis for the tests in Comparable.

Returns nil if module has no relationship with other_module, if other_module is not a module, or if the two values are incomparable.

Source: show 

static VALUE
rb_mod_cmp(VALUE mod, VALUE arg)
{
    VALUE cmp;

    if (mod == arg) return INT2FIX(0);
    if (!CLASS_OR_MODULE_P(arg)) {
        return Qnil;
    }

    cmp = rb_class_inherited_p(mod, arg);
    if (NIL_P(cmp)) return Qnil;
    if (cmp) {
        return INT2FIX(-1);
    }
    return INT2FIX(1);
}
obj == other → true or false obj.equal?(other) → true or false obj.eql?(other) → true or false

Equality — At the Object level, == returns true only if obj and other are the same object. Typically, this method is overridden in descendant classes to provide class-specific meaning.

Unlike ==, the equal? method should never be overridden by subclasses as it is used to determine object identity (that is, a.equal?(b) if and only if a is the same object as b):

obj = "a"
other = obj.dup

a == other      #=> true
a.equal? other  #=> false
a.equal? a      #=> true

The eql? method returns true if obj and other refer to the same hash key. This is used by Hash to test members for equality. For objects of class Object, eql? is synonymous with ==. Subclasses normally continue this tradition by aliasing eql? to their overridden == method, but there are exceptions. Numeric types, for example, perform type conversion across ==, but not across eql?, so:

1 == 1.0     #=> true
1.eql? 1.0   #=> false

Source: show 

VALUE
rb_obj_equal(VALUE obj1, VALUE obj2)
{
    if (obj1 == obj2) return Qtrue;
    return Qfalse;
}
mod === obj → true or false

Case Equality—Returns true if anObject is an instance of mod or one of mod's descendants. Of limited use for modules, but can be used in case statements to classify objects by class.

Source: show 

static VALUE
rb_mod_eqq(VALUE mod, VALUE arg)
{
    return rb_obj_is_kind_of(arg, mod);
}
mod > other → true, false, or nil

Returns true if mod is an ancestor of other. Returns nil if there's no relationship between the two. (Think of the relationship in terms of the class definition: “class A<B” implies “B>A”).

Source: show 

static VALUE
rb_mod_gt(VALUE mod, VALUE arg)
{
    if (mod == arg) return Qfalse;
    return rb_mod_ge(mod, arg);
}
mod >= other → true, false, or nil

Returns true if mod is an ancestor of other, or the two modules are the same. Returns nil if there's no relationship between the two. (Think of the relationship in terms of the class definition: “class A<B” implies “B>A”).

Source: show 

static VALUE
rb_mod_ge(VALUE mod, VALUE arg)
{
    if (!CLASS_OR_MODULE_P(arg)) {
        rb_raise(rb_eTypeError, "compared with non class/module");
    }

    return rb_class_inherited_p(arg, mod);
}
mod.ancestors → array

Returns a list of modules included in mod (including mod itself).

module Mod
  include Math
  include Comparable
end

Mod.ancestors    #=> [Mod, Comparable, Math]
Math.ancestors   #=> [Math]

Source: show 

VALUE
rb_mod_ancestors(VALUE mod)
{
    VALUE p, ary = rb_ary_new();

    for (p = mod; p; p = RCLASS_SUPER(p)) {
	if (FL_TEST(p, FL_SINGLETON))
	    continue;
	if (BUILTIN_TYPE(p) == T_ICLASS) {
	    rb_ary_push(ary, RBASIC(p)->klass);
	}
	else if (p == RCLASS_ORIGIN(p)) {
	    rb_ary_push(ary, p);
	}
    }
    return ary;
}
mod.autoload(module, filename) → nil

Registers filename to be loaded (using Kernel::require) the first time that module (which may be a String or a symbol) is accessed in the namespace of mod.

module A
end
A.autoload(:B, "b")
A::B.doit            # autoloads "b"

Source: show 

static VALUE
rb_mod_autoload(VALUE mod, VALUE sym, VALUE file)
{
    ID id = rb_to_id(sym);

    FilePathValue(file);
    rb_autoload(mod, id, RSTRING_PTR(file));
    return Qnil;
}
mod.autoload?(name) → String or nil

Returns filename to be loaded if name is registered as autoload in the namespace of mod.

module A
end
A.autoload(:B, "b")
A.autoload?(:B)            #=> "b"

Source: show 

static VALUE
rb_mod_autoload_p(VALUE mod, VALUE sym)
{
    ID id = rb_check_id(&sym);
    if (!id) {
        return Qnil;
    }
    return rb_autoload_p(mod, id);
}
mod.class_eval(string [, filename [, lineno]]) → obj

Evaluates the string or block in the context of mod, except that when a block is given, constant/class variable lookup is not affected. This can be used to add methods to a class. module_eval returns the result of evaluating its argument. The optional filename and lineno parameters set the text for error messages.

class Thing
end
a = %q{def hello() "Hello there!" end}
Thing.module_eval(a)
puts Thing.new.hello()
Thing.module_eval("invalid code", "dummy", 123)

produces:

Hello there!
dummy:123:in `module_eval': undefined local variable
    or method `code' for Thing:Class

Source: show 

VALUE
rb_mod_module_eval(int argc, VALUE *argv, VALUE mod)
{
    return specific_eval(argc, argv, mod, mod);
}
mod.class_exec(arg...) {|var...| block } → obj

Evaluates the given block in the context of the class/module. The method defined in the block will belong to the receiver.

class Thing
end
Thing.class_exec{
  def hello() "Hello there!" end
}
puts Thing.new.hello()

produces:

Hello there!

Source: show 

VALUE
rb_mod_module_exec(int argc, VALUE *argv, VALUE mod)
{
    return yield_under(mod, mod, rb_ary_new4(argc, argv));
}
obj.class_variable_defined?(symbol) → true or false

Returns true if the given class variable is defined in obj.

class Fred
  @@foo = 99
end
Fred.class_variable_defined?(:@@foo)    #=> true
Fred.class_variable_defined?(:@@bar)    #=> false

Source: show 

static VALUE
rb_mod_cvar_defined(VALUE obj, VALUE iv)
{
    ID id = rb_check_id(&iv);

    if (!id) {
        if (rb_is_class_name(iv)) {
            return Qfalse;
        }
        else {
            rb_name_error_str(iv, "`%"PRIsVALUE"' is not allowed as a class variable name",
                              QUOTE(iv));
        }
    }
    if (!rb_is_class_id(id)) {
        rb_name_error(id, "`%"PRIsVALUE"' is not allowed as a class variable name",
                      QUOTE_ID(id));
    }
    return rb_cvar_defined(obj, id);
}
mod.class_variable_get(symbol) → obj

Returns the value of the given class variable (or throws a NameError exception). The @@ part of the variable name should be included for regular class variables

class Fred
  @@foo = 99
end
Fred.class_variable_get(:@@foo)     #=> 99

Source: show 

static VALUE
rb_mod_cvar_get(VALUE obj, VALUE iv)
{
    ID id = rb_check_id(&iv);

    if (!id) {
        if (rb_is_class_name(iv)) {
            rb_name_error_str(iv, "uninitialized class variable %"PRIsVALUE" in %"PRIsVALUE"",
                              iv, rb_class_name(obj));
        }
        else {
            rb_name_error_str(iv, "`%"PRIsVALUE"' is not allowed as a class variable name",
                              QUOTE(iv));
        }
    }
    if (!rb_is_class_id(id)) {
        rb_name_error(id, "`%"PRIsVALUE"' is not allowed as a class variable name",
                      QUOTE_ID(id));
    }
    return rb_cvar_get(obj, id);
}
obj.class_variable_set(symbol, obj) → obj

Sets the class variable names by symbol to object.

class Fred
  @@foo = 99
  def foo
    @@foo
  end
end
Fred.class_variable_set(:@@foo, 101)     #=> 101
Fred.new.foo                             #=> 101

Source: show 

static VALUE
rb_mod_cvar_set(VALUE obj, VALUE iv, VALUE val)
{
    ID id = rb_to_id(iv);

    if (!rb_is_class_id(id)) {
        rb_name_error(id, "`%"PRIsVALUE"' is not allowed as a class variable name",
                      QUOTE_ID(id));
    }
    rb_cvar_set(obj, id, val);
    return val;
}
mod.class_variables(inherit=true) → array

Returns an array of the names of class variables in mod. This includes the names of class variables in any included modules, unless the inherit parameter is set to false.

class One
  @@var1 = 1
end
class Two < One
  @@var2 = 2
end
One.class_variables          #=> [:@@var1]
Two.class_variables          #=> [:@@var2, :@@var1]
Two.class_variables(false)   #=> [:@@var2]

Source: show 

VALUE
rb_mod_class_variables(int argc, VALUE *argv, VALUE mod)
{
    VALUE inherit;
    st_table *tbl;

    if (argc == 0) {
	inherit = Qtrue;
    }
    else {
	rb_scan_args(argc, argv, "01", &inherit);
    }
    if (RTEST(inherit)) {
	tbl = mod_cvar_of(mod, 0);
    }
    else {
	tbl = mod_cvar_at(mod, 0);
    }
    return cvar_list(tbl);
}
mod.const_defined?(sym, inherit=true) → true or false

Checks for a constant with the given name in mod If inherit is set, the lookup will also search the ancestors (and Object if mod is a Module.)

Returns whether or not a definition is found:

Math.const_defined? "PI"   #=> true
IO.const_defined? :SYNC   #=> true
IO.const_defined? :SYNC, false   #=> false

Source: show 

static VALUE
rb_mod_const_defined(int argc, VALUE *argv, VALUE mod)
{
    VALUE name, recur;
    ID id;

    if (argc == 1) {
        name = argv[0];
        recur = Qtrue;
    }
    else {
        rb_scan_args(argc, argv, "11", &name, &recur);
    }
    if (!(id = rb_check_id(&name))) {
        if (rb_is_const_name(name)) {
            return Qfalse;
        }
        else {
            rb_name_error_str(name, "wrong constant name %"PRIsVALUE,
                              QUOTE(name));
        }
    }
    if (!rb_is_const_id(id)) {
        rb_name_error(id, "wrong constant name %"PRIsVALUE,
                      QUOTE_ID(id));
    }
    return RTEST(recur) ? rb_const_defined(mod, id) : rb_const_defined_at(mod, id);
}
mod.const_get(sym, inherit=true) → obj mod.const_get(str, inherit=true) → obj

Checks for a constant with the given name in mod If inherit is set, the lookup will also search the ancestors (and Object if mod is a Module.)

The value of the constant is returned if a definition is found, otherwise a NameError is raised.

Math.const_get(:PI)   #=> 3.14159265358979

This method will recursively look up constant names if a namespaced class name is provided. For example:

module Foo; class Bar; end end
Object.const_get 'Foo::Bar'

The inherit flag is respected on each lookup. For example:

module Foo
  class Bar
    VAL = 10
  end

  class Baz < Bar; end
end

Object.const_get 'Foo::Baz::VAL'         # => 10
Object.const_get 'Foo::Baz::VAL', false  # => NameError

Source: show 

static VALUE
rb_mod_const_get(int argc, VALUE *argv, VALUE mod)
{
    VALUE name, recur;
    rb_encoding *enc;
    const char *pbeg, *p, *path, *pend;
    ID id;
    int nestable = 1;

    if (argc == 1) {
        name = argv[0];
        recur = Qtrue;
    }
    else {
        rb_scan_args(argc, argv, "11", &name, &recur);
    }

    if (SYMBOL_P(name)) {
        name = rb_sym_to_s(name);
        nestable = 0;
    }

    name = rb_check_string_type(name);
    Check_Type(name, T_STRING);

    enc = rb_enc_get(name);
    path = RSTRING_PTR(name);

    if (!rb_enc_asciicompat(enc)) {
        rb_raise(rb_eArgError, "invalid class path encoding (non ASCII)");
    }

    pbeg = p = path;
    pend = path + RSTRING_LEN(name);

    if (p >= pend || !*p) {
      wrong_name:
        rb_raise(rb_eNameError, "wrong constant name %"PRIsVALUE,
                 QUOTE(name));
    }

    if (p + 2 < pend && p[0] == ':' && p[1] == ':') {
        if (!nestable) goto wrong_name;
        mod = rb_cObject;
        p += 2;
        pbeg = p;
    }

    while (p < pend) {
        VALUE part;
        long len, beglen;

        while (p < pend && *p != ':') p++;

        if (pbeg == p) goto wrong_name;

        id = rb_check_id_cstr(pbeg, len = p-pbeg, enc);
        beglen = pbeg-path;

        if (p < pend && p[0] == ':') {
            if (!nestable) goto wrong_name;
            if (p + 2 >= pend || p[1] != ':') goto wrong_name;
            p += 2;
            pbeg = p;
        }

        if (!RB_TYPE_P(mod, T_MODULE) && !RB_TYPE_P(mod, T_CLASS)) {
            rb_raise(rb_eTypeError, "%"PRIsVALUE" does not refer to class/module",
                     QUOTE(name));
        }

        if (!id) {
            if (!ISUPPER(*pbeg) || !rb_enc_symname2_p(pbeg, len, enc)) {
                part = rb_str_subseq(name, beglen, len);
                rb_name_error_str(part, "wrong constant name %"PRIsVALUE,
                                  QUOTE(part));
            }
            else if (!rb_method_basic_definition_p(CLASS_OF(mod), id_const_missing)) {
                id = rb_intern3(pbeg, len, enc);
            }
            else {
                part = rb_str_subseq(name, beglen, len);
                rb_name_error_str(part, "uninitialized constant %"PRIsVALUE"%"PRIsVALUE,
                                  rb_str_subseq(name, 0, beglen),
                                  QUOTE(part));
            }
        }
        if (!rb_is_const_id(id)) {
            rb_name_error(id, "wrong constant name %"PRIsVALUE,
                          QUOTE_ID(id));
        }
        mod = RTEST(recur) ? rb_const_get(mod, id) : rb_const_get_at(mod, id);
    }

    return mod;
}
const_missing(const_name)

Check for deprecated uses of top level (i.e. in Object) uses of Rake class names. If someone tries to reference the constant name, display a warning and return the proper object. Using the –classic-namespace command line option will define these constants in Object and avoid this handler.

Also aliased as: rake_original_const_missing

Source: show | on GitHub 

# File lib/rake/ext/module.rb, line 21
def const_missing(const_name)
  case const_name
  when :Task
    Rake.application.const_warning(const_name)
    Rake::Task
  when :FileTask
    Rake.application.const_warning(const_name)
    Rake::FileTask
  when :FileCreationTask
    Rake.application.const_warning(const_name)
    Rake::FileCreationTask
  when :RakeApp
    Rake.application.const_warning(const_name)
    Rake::Application
  else
    rake_original_const_missing(const_name)
  end
end
mod.const_set(sym, obj) → obj

Sets the named constant to the given object, returning that object. Creates a new constant if no constant with the given name previously existed.

Math.const_set("HIGH_SCHOOL_PI", 22.0/7.0)   #=> 3.14285714285714
Math::HIGH_SCHOOL_PI - Math::PI              #=> 0.00126448926734968

Source: show 

static VALUE
rb_mod_const_set(VALUE mod, VALUE name, VALUE value)
{
    ID id = rb_to_id(name);

    if (!rb_is_const_id(id)) {
        rb_name_error(id, "wrong constant name %"PRIsVALUE,
                      QUOTE_ID(id));
    }
    rb_const_set(mod, id, value);
    return value;
}
mod.constants(inherit=true) → array

Returns an array of the names of the constants accessible in mod. This includes the names of constants in any included modules (example at start of section), unless the inherit parameter is set to false.

IO.constants.include?(:SYNC)        #=> true
IO.constants(false).include?(:SYNC) #=> false

Also see Module::const_defined?.

Source: show 

VALUE
rb_mod_constants(int argc, VALUE *argv, VALUE mod)
{
    VALUE inherit;
    st_table *tbl;

    if (argc == 0) {
	inherit = Qtrue;
    }
    else {
	rb_scan_args(argc, argv, "01", &inherit);
    }
    if (RTEST(inherit)) {
	tbl = rb_mod_const_of(mod, 0);
    }
    else {
	tbl = rb_mod_const_at(mod, 0);
    }
    return rb_const_list(tbl);
}
mod.freeze → mod

Prevents further modifications to mod.

This method returns self.

Source: show 

static VALUE
rb_mod_freeze(VALUE mod)
{
    rb_class_name(mod);
    return rb_obj_freeze(mod);
}
mod.include?(module) → true or false

Returns true 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

Source: show 

VALUE
rb_mod_include_p(VALUE mod, VALUE mod2)
{
    VALUE p;

    Check_Type(mod2, T_MODULE);
    for (p = RCLASS_SUPER(mod); p; p = RCLASS_SUPER(p)) {
	if (BUILTIN_TYPE(p) == T_ICLASS) {
	    if (RBASIC(p)->klass == mod2) return Qtrue;
	}
    }
    return Qfalse;
}
mod.included_modules → array

Returns the list of modules included in mod.

module Mixin
end

module Outer
  include Mixin
end

Mixin.included_modules   #=> []
Outer.included_modules   #=> [Mixin]

Source: show 

VALUE
rb_mod_included_modules(VALUE mod)
{
    VALUE ary = rb_ary_new();
    VALUE p;
    VALUE origin = RCLASS_ORIGIN(mod);

    for (p = RCLASS_SUPER(mod); p; p = RCLASS_SUPER(p)) {
	if (p != origin && BUILTIN_TYPE(p) == T_ICLASS) {
	    VALUE m = RBASIC(p)->klass;
	    if (RB_TYPE_P(m, T_MODULE))
		rb_ary_push(ary, m);
	}
    }
    return ary;
}
inspect()
Alias for: to_s
mod.instance_method(symbol) → unbound_method

Returns an UnboundMethod representing the given instance method in mod.

class Interpreter
  def do_a() print "there, "; end
  def do_d() print "Hello ";  end
  def do_e() print "!\n";     end
  def do_v() print "Dave";    end
  Dispatcher = {
    "a" => instance_method(:do_a),
    "d" => instance_method(:do_d),
    "e" => instance_method(:do_e),
    "v" => instance_method(:do_v)
  }
  def interpret(string)
    string.each_char {|b| Dispatcher[b].bind(self).call }
  end
end

interpreter = Interpreter.new
interpreter.interpret('dave')

produces:

Hello there, Dave!

Source: show 

static VALUE
rb_mod_instance_method(VALUE mod, VALUE vid)
{
    ID id = rb_check_id(&vid);
    if (!id) {
        rb_method_name_error(mod, vid);
    }
    return mnew(mod, Qundef, id, rb_cUnboundMethod, FALSE);
}
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 false, 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

Source: show 

VALUE
rb_class_instance_methods(int argc, VALUE *argv, VALUE mod)
{
    return class_instance_method_list(argc, argv, mod, 0, ins_methods_i);
}
mod.method_defined?(symbol) → true or false

Returns true if the named method is defined by mod (or its included modules and, if mod is a class, its ancestors). Public and protected methods are matched.

module A
  def method1()  end
end
class B
  def method2()  end
end
class C < B
  include A
  def method3()  end
end

A.method_defined? :method1    #=> true
C.method_defined? "method1"   #=> true
C.method_defined? "method2"   #=> true
C.method_defined? "method3"   #=> true
C.method_defined? "method4"   #=> false

Source: show 

static VALUE
rb_mod_method_defined(VALUE mod, VALUE mid)
{
    ID id = rb_check_id(&mid);
    if (!id || !rb_method_boundp(mod, id, 1)) {
        return Qfalse;
    }
    return Qtrue;

}
mod.module_eval {|| block } → obj

Evaluates the string or block in the context of mod, except that when a block is given, constant/class variable lookup is not affected. This can be used to add methods to a class. module_eval returns the result of evaluating its argument. The optional filename and lineno parameters set the text for error messages.

class Thing
end
a = %q{def hello() "Hello there!" end}
Thing.module_eval(a)
puts Thing.new.hello()
Thing.module_eval("invalid code", "dummy", 123)

produces:

Hello there!
dummy:123:in `module_eval': undefined local variable
    or method `code' for Thing:Class

Source: show 

VALUE
rb_mod_module_eval(int argc, VALUE *argv, VALUE mod)
{
    return specific_eval(argc, argv, mod, mod);
}
mod.module_exec(arg...) {|var...| block } → obj

Evaluates the given block in the context of the class/module. The method defined in the block will belong to the receiver.

class Thing
end
Thing.class_exec{
  def hello() "Hello there!" end
}
puts Thing.new.hello()

produces:

Hello there!

Source: show 

VALUE
rb_mod_module_exec(int argc, VALUE *argv, VALUE mod)
{
    return yield_under(mod, mod, rb_ary_new4(argc, argv));
}
mod.name → string

Returns the name of the module mod. Returns nil for anonymous modules.

Source: show 

VALUE
rb_mod_name(VALUE mod)
{
    int permanent;
    VALUE path = classname(mod, &permanent);

    if (!NIL_P(path)) return rb_str_dup(path);
    return path;
}
mod.private_class_method(symbol, ...) → mod

Makes existing class methods private. Often used to hide the default constructor new.

class SimpleSingleton  # Not thread safe
  private_class_method :new
  def SimpleSingleton.create(*args, &block)
    @me = new(*args, &block) if ! @me
    @me
  end
end

Source: show 

static VALUE
rb_mod_private_method(int argc, VALUE *argv, VALUE obj)
{
    set_method_visibility(rb_singleton_class(obj), argc, argv, NOEX_PRIVATE);
    return obj;
}
mod.private_constant(symbol, ...) => mod

Makes a list of existing constants private.

Source: show 

VALUE
rb_mod_private_constant(int argc, VALUE *argv, VALUE obj)
{
    set_const_visibility(obj, argc, argv, CONST_PRIVATE);
    return obj;
}
mod.private_instance_methods(include_super=true) → array

Returns a list of the private instance methods defined in mod. If the optional parameter is not false, the methods of any ancestors are included.

module Mod
  def method1()  end
  private :method1
  def method2()  end
end
Mod.instance_methods           #=> [:method2]
Mod.private_instance_methods   #=> [:method1]

Source: show 

VALUE
rb_class_private_instance_methods(int argc, VALUE *argv, VALUE mod)
{
    return class_instance_method_list(argc, argv, mod, 0, ins_methods_priv_i);
}
mod.private_method_defined?(symbol) → true or false

Returns true if the named private method is defined by _ mod_ (or its included modules and, if mod is a class, its ancestors).

module A
  def method1()  end
end
class B
  private
  def method2()  end
end
class C < B
  include A
  def method3()  end
end

A.method_defined? :method1            #=> true
C.private_method_defined? "method1"   #=> false
C.private_method_defined? "method2"   #=> true
C.method_defined? "method2"           #=> false

Source: show 

static VALUE
rb_mod_private_method_defined(VALUE mod, VALUE mid)
{
    return check_definition(mod, mid, NOEX_PRIVATE);
}
mod.protected_instance_methods(include_super=true) → array

Returns a list of the protected instance methods defined in mod. If the optional parameter is not false, the methods of any ancestors are included.

Source: show 

VALUE
rb_class_protected_instance_methods(int argc, VALUE *argv, VALUE mod)
{
    return class_instance_method_list(argc, argv, mod, 0, ins_methods_prot_i);
}
mod.protected_method_defined?(symbol) → true or false

Returns true if the named protected method is defined by mod (or its included modules and, if mod is a class, its ancestors).

module A
  def method1()  end
end
class B
  protected
  def method2()  end
end
class C < B
  include A
  def method3()  end
end

A.method_defined? :method1              #=> true
C.protected_method_defined? "method1"   #=> false
C.protected_method_defined? "method2"   #=> true
C.method_defined? "method2"             #=> true

Source: show 

static VALUE
rb_mod_protected_method_defined(VALUE mod, VALUE mid)
{
    return check_definition(mod, mid, NOEX_PROTECTED);
}
psych_yaml_as(url)
Also aliased as: yaml_as

Source: show | on GitHub 

# File ext/psych/lib/psych/core_ext.rb, line 21
def psych_yaml_as url
  return if caller[0].end_with?('rubytypes.rb')
  if $VERBOSE
    warn "#{caller[0]}: yaml_as is deprecated, please use yaml_tag"
  end
  Psych.add_tag(url, self)
end
mod.public_class_method(symbol, ...) → mod

Makes a list of existing class methods public.

Source: show 

static VALUE
rb_mod_public_method(int argc, VALUE *argv, VALUE obj)
{
    set_method_visibility(rb_singleton_class(obj), argc, argv, NOEX_PUBLIC);
    return obj;
}
mod.public_constant(symbol, ...) => mod

Makes a list of existing constants public.

Source: show 

VALUE
rb_mod_public_constant(int argc, VALUE *argv, VALUE obj)
{
    set_const_visibility(obj, argc, argv, CONST_PUBLIC);
    return obj;
}
mod.public_instance_method(symbol) → unbound_method

Similar to instance_method, searches public method only.

Source: show 

static VALUE
rb_mod_public_instance_method(VALUE mod, VALUE vid)
{
    ID id = rb_check_id(&vid);
    if (!id) {
        rb_method_name_error(mod, vid);
    }
    return mnew(mod, Qundef, id, rb_cUnboundMethod, TRUE);
}
mod.public_instance_methods(include_super=true) → array

Returns a list of the public instance methods defined in mod. If the optional parameter is not false, the methods of any ancestors are included.

Source: show 

VALUE
rb_class_public_instance_methods(int argc, VALUE *argv, VALUE mod)
{
    return class_instance_method_list(argc, argv, mod, 0, ins_methods_pub_i);
}
mod.public_method_defined?(symbol) → true or false

Returns true if the named public method is defined by mod (or its included modules and, if mod is a class, its ancestors).

module A
  def method1()  end
end
class B
  protected
  def method2()  end
end
class C < B
  include A
  def method3()  end
end

A.method_defined? :method1           #=> true
C.public_method_defined? "method1"   #=> true
C.public_method_defined? "method2"   #=> false
C.method_defined? "method2"          #=> true

Source: show 

static VALUE
rb_mod_public_method_defined(VALUE mod, VALUE mid)
{
    return check_definition(mod, mid, NOEX_PUBLIC);
}
rake_extension(method)

Check for an existing method in the current class before extending. IF the method already exists, then a warning is printed and the extension is not added. Otherwise the block is yielded and any definitions in the block will take effect.

Usage:

class String
  rake_extension("xyz") do
    def xyz
      ...
    end
  end
end

Source: show | on GitHub 

# File lib/rake/ext/core.rb, line 20
def rake_extension(method)
  if method_defined?(method)
    $stderr.puts "WARNING: Possible conflict with Rake extension: #{self}##{method} already exists"
  else
    yield
  end
end
rake_original_const_missing(const_name)

Rename the original handler to make it available.

Alias for: const_missing
remove_class_variable(sym) → obj

Removes the definition of the sym, returning that constant's value.

class Dummy
  @@var = 99
  puts @@var
  remove_class_variable(:@@var)
  p(defined? @@var)
end

produces:

99
nil

Source: show 

VALUE
rb_mod_remove_cvar(VALUE mod, VALUE name)
{
    const ID id = rb_check_id(&name);
    st_data_t val, n = id;

    if (!id) {
	if (rb_is_class_name(name)) {
	    rb_name_error_str(name, "class variable %"PRIsVALUE" not defined for %"PRIsVALUE"",
			      name, rb_class_name(mod));
	}
	else {
	    rb_name_error_str(name, "wrong class variable name %"PRIsVALUE"", QUOTE(name));
	}
    }
    if (!rb_is_class_id(id)) {
	rb_name_error(id, "wrong class variable name %"PRIsVALUE"", QUOTE_ID(id));
    }
    if (!OBJ_UNTRUSTED(mod) && rb_safe_level() >= 4)
	rb_raise(rb_eSecurityError, "Insecure: can't remove class variable");
    rb_check_frozen(mod);
    if (RCLASS_IV_TBL(mod) && st_delete(RCLASS_IV_TBL(mod), &n, &val)) {
	return (VALUE)val;
    }
    if (rb_cvar_defined(mod, id)) {
	rb_name_error(id, "cannot remove %"PRIsVALUE" for %"PRIsVALUE"",
		 QUOTE_ID(id), rb_class_name(mod));
    }
    rb_name_error(id, "class variable %"PRIsVALUE" not defined for %"PRIsVALUE"",
		  QUOTE_ID(id), rb_class_name(mod));

    UNREACHABLE;
}
mod.to_s → string

Return a string representing this module or class. For basic classes and modules, this is the name. For singletons, we show information on the thing we're attached to as well.

Also aliased as: inspect

Source: show 

static VALUE
rb_mod_to_s(VALUE klass)
{
    ID id_defined_at;
    VALUE refined_class, defined_at;

    if (FL_TEST(klass, FL_SINGLETON)) {
        VALUE s = rb_usascii_str_new2("#<Class:");
        VALUE v = rb_iv_get(klass, "__attached__");

        if (CLASS_OR_MODULE_P(v)) {
            rb_str_append(s, rb_inspect(v));
        }
        else {
            rb_str_append(s, rb_any_to_s(v));
        }
        rb_str_cat2(s, ">");

        return s;
    }
    refined_class = rb_refinement_module_get_refined_class(klass);
    if (!NIL_P(refined_class)) {
        VALUE s = rb_usascii_str_new2("#<refinement:");

        rb_str_concat(s, rb_inspect(refined_class));
        rb_str_cat2(s, "@");
        CONST_ID(id_defined_at, "__defined_at__");
        defined_at = rb_attr_get(klass, id_defined_at);
        rb_str_concat(s, rb_inspect(defined_at));
        rb_str_cat2(s, ">");
        return s;
    }
    return rb_str_dup(rb_class_name(klass));
}
yaml_as(url)
Alias for: psych_yaml_as