Class: Module

Inherits:
Object show all
Defined in:
lib/olelo/extensions.rb

Direct Known Subclasses

Olelo::Plugin

Instance Method Summary collapse

Instance Method Details

#attr_reader?(*attrs) ⇒ void

This method returns an undefined value.

Generate accessor method with question mark

Parameters:

  • attrs (String, Symbol...) —

    Attributes to generate setter for



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# File 'lib/olelo/extensions.rb', line 10

def attr_reader?(*attrs)
  attrs.each do |a|
    module_eval "def #{a}?; !!@#{a}; end"
  end
end

#attr_setter(*attrs) ⇒ void

This method returns an undefined value.

Generate attribute setter

A setter accepts an argument to set a value. It acts as a getter without an argument.

Parameters:

  • attrs (String, Symbol...) —

    Attributes to generate setter for

See Also:

  • facets


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# File 'lib/olelo/extensions.rb', line 25

def attr_setter(*attrs)
  code, made = '', []
  attrs.each do |a|
    code << "def #{a}(*a); a.size > 0 ? (@#{a}=a[0]; self) : @#{a} end\n"
    made << a.to_sym
  end
  module_eval(code)
  made
end

#private_constant(*args) ⇒ Object

HACK: private_constant was introduced in 1.9.3



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# File 'lib/olelo/extensions.rb', line 3

def private_constant(*args); end

#redefine_method(name) { ... } ⇒ void

This method returns an undefined value.

Redefine a module method

Replaces alias_method_chain and allows to call overwritten method via super.

Parameters:

Yields:

  • New method block



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# File 'lib/olelo/extensions.rb', line 44

def redefine_method(name, &block)
  if instance_methods(false).any? {|x| x.to_s == name.to_s }
    method = instance_method(name)
    mod = Module.new do
      define_method(name) {|*args| method.bind(self).call(*args) }
    end
    remove_method(name)
    include(mod)
  end
  include(Module.new { define_method(name, &block) })
end