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Class: Delegator

Inherits:
BasicObject
Defined in:
opal/stdlib/delegate.rb

Direct Known Subclasses

SimpleDelegator

Constant Summary collapse

VERSION = 
'0.2.0'

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(obj) ⇒ Delegator

Pass in the obj to delegate method calls to. All methods supported by obj will be delegated to.

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# File 'opal/stdlib/delegate.rb', line 82
def initialize(obj)
 __setobj__(obj)
end

Class Method Details

.const_missing(n) ⇒ Object

:stopdoc:

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# File 'opal/stdlib/delegate.rb', line 67
def self.const_missing(n)
 ::Object .const_get(n)
end

.delegating_block(mid) ⇒ Object

:nodoc:

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# File 'opal/stdlib/delegate.rb', line 359
def Delegator .delegating_block(mid) # :nodoc:
 ->(*args, &block) do
 target = __getobj__
 target.__send__(mid, *args, &block)
 end.ruby2_keywords 
end

.public_api ⇒ Object

:nodoc:

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# File 'opal/stdlib/delegate.rb', line 256
def self.public_api # :nodoc:
 @delegator_api
end

Instance Method Details

#! ⇒ Object

Delegates ! to the __getobj__

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# File 'opal/stdlib/delegate.rb', line 187
def !
 !__getobj__
end

#!=(obj) ⇒ Object

Returns true if two objects are not considered of equal value.

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# File 'opal/stdlib/delegate.rb', line 171
def !=(obj)
 return false if obj.equal?(self)
 __getobj__ != obj
end

#==(obj) ⇒ Object

Returns true if two objects are considered of equal value.

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# File 'opal/stdlib/delegate.rb', line 163
def ==(obj)
 return true if obj.equal?(self)
 __getobj__ == obj
end

#__getobj__ ⇒ Object

This method must be overridden by subclasses and should return the object method calls are being delegated to.

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# File 'opal/stdlib/delegate.rb', line 195
def __getobj__
 __raise__ ::NotImplementedError, "need to define `__getobj__'"
end

#__setobj__(obj) ⇒ Object

This method must be overridden by subclasses and change the object delegate to obj.

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# File 'opal/stdlib/delegate.rb', line 203
def __setobj__(obj)
 __raise__ ::NotImplementedError, "need to define `__setobj__'"
end

#eql?(obj) ⇒ Boolean

Returns true if two objects are considered of equal value.

Returns:

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# File 'opal/stdlib/delegate.rb', line 179
def eql?(obj)
 return true if obj.equal?(self)
 obj.eql?(__getobj__)
end

#freeze ⇒ Object

:method: freeze Freeze both the object returned by __getobj__ and self.

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# File 'opal/stdlib/delegate.rb', line 245
def freeze
 __getobj__.freeze
 `$freeze_props(self)`
 `$freeze(self)`
end

#frozen? ⇒ Boolean

Returns:

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# File 'opal/stdlib/delegate.rb', line 251
def frozen?
 `(self.$$frozen || false)`
end

#marshal_dump ⇒ Object

Serialization support for the object returned by __getobj__.

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# File 'opal/stdlib/delegate.rb', line 210
def marshal_dump
 ivars = instance_variables.reject { |var| /\A@delegate_/ =~ var }
 [
 :__v2__,
 ivars, ivars.map { |var| instance_variable_get(var) },
 __getobj__
 ]
end

#marshal_load(data) ⇒ Object

Reinitializes delegation from a serialized object.

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# File 'opal/stdlib/delegate.rb', line 222
def marshal_load(data)
 version, vars, values, obj = data
 if version == :__v2__
 vars.each_with_index { |var, i| instance_variable_set(var, values[i]) }
 __setobj__(obj)
 else
 __setobj__(data)
 end
end

#methods(all = true) ⇒ Object

Returns the methods available to this delegate object as the union of this object's and __getobj__ methods.

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# File 'opal/stdlib/delegate.rb', line 138
def methods(all = true)
 __getobj__.methods(all) | super
end

#protected_methods(all = true) ⇒ Object

Returns the methods available to this delegate object as the union of this object's and __getobj__ protected methods.

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# File 'opal/stdlib/delegate.rb', line 154
def protected_methods(all = true)
 __getobj__.protected_methods(all) | super
end

#public_methods(all = true) ⇒ Object

Returns the methods available to this delegate object as the union of this object's and __getobj__ public methods.

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# File 'opal/stdlib/delegate.rb', line 146
def public_methods(all = true)
 __getobj__.public_methods(all) | super
end

#respond_to_missing?(m, include_private) ⇒ Boolean

Checks for a method provided by this the delegate object by forwarding the call through __getobj__.

Returns:

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# File 'opal/stdlib/delegate.rb', line 106
def respond_to_missing?(m, include_private)
 r = true
 target = __getobj__ { r = false }
 r &&= target_respond_to?(target, m, include_private)
 if r && include_private && !target_respond_to?(target, m, false)
 warn "delegator does not forward private method \##{m}", uplevel: 3
 return false
 end
 r
end

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