Class: ConfigLeaf::Wrapper

Inherits:
Object
  • Object
show all
Defined in:
lib/config_leaf/wrapper.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(owner, &block) ⇒ Wrapper

If passed a block, the Wrapper will #instance_eval it automatically.

Parameters:

  • owner (Object) —

    Object to redirect the public methods of.



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# File 'lib/config_leaf/wrapper.rb', line 15

def initialize(owner, &block)
  @_owner = owner

  metaclass = class << self; self; end

  (@_owner.public_methods - Object.public_instance_methods).each do |target_method|
    redirection_method = target_method.to_s.chomp('=').to_sym

    metaclass.class_eval do
      define_method redirection_method do |*args, &inner_block|
        if @_owner.respond_to? "#{redirection_method}=" and (args.any? or not @_owner.respond_to? redirection_method)
          # Has a setter and we are passing argument(s) or if we haven't got a corresponding getter.
          @_owner.send "#{redirection_method}=", *args, &inner_block
        elsif @_owner.respond_to? redirection_method
          # We have a getter or general method
          @_owner.send redirection_method, *args, &inner_block
        else
          # Should never reach here, but let's be paranoid.
          raise NoMethodError, "#{@_owner} does not have a public method, ##{redirection_method}"
        end
      end
    end
  end

  instance_eval &block if block_given?

  if instance_variables != [:@_owner]
    altered = instance_variables - [:@_owner]
    raise "Instance variable#{altered.one? ? '' : 's'} #{altered.join ", "} set in ConfigLeaf scope"
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args, &block) ⇒ Object (private)

Raises:

  • (NoMethodError) 


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# File 'lib/config_leaf/wrapper.rb', line 48

def method_missing(meth, *args, &block)
  raise NoMethodError, "#{_owner} does not have either public method, ##{meth} or ##{meth}="
end

Instance Attribute Details

#_owner ⇒ Object (readonly)

Returns Object that the Wrapper object is redirecting to.

Returns:

  • (Object) —

    Object that the Wrapper object is redirecting to.



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# File 'lib/config_leaf/wrapper.rb', line 5

def _owner
  @_owner
end