Class: Ceres::Writer

Inherits:
Object
  • Object
show all
Defined in:
lib/ceres/writer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attribute, &block) ⇒ Writer

Returns a new instance of Writer.



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# File 'lib/ceres/writer.rb', line 6

def initialize(attribute, &block)
  @attribute = attribute
  @block = block
end

Instance Attribute Details

#attribute ⇒ Object (readonly)

Returns the value of attribute attribute.



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# File 'lib/ceres/writer.rb', line 3

def attribute
  @attribute
end

#block ⇒ Object (readonly)

Returns the value of attribute block.



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# File 'lib/ceres/writer.rb', line 4

def block
  @block
end

Instance Method Details

#apply(klass) ⇒ Object 



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# File 'lib/ceres/writer.rb', line 46

def apply(klass)
  if allow_writer_optimisation?
    name = self.name

    klass.instance_exec { attr_writer name }
  else
    name = "#{@attribute.name}=".to_sym
    writer = self.to_proc

    klass.instance_exec { define_method(name, &writer) }
  end
end

#name ⇒ Object 



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# File 'lib/ceres/writer.rb', line 11

def name
  @attribute.name
end

#target ⇒ Object 



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# File 'lib/ceres/writer.rb', line 15

def target
  @attribute.target
end

#to_proc ⇒ Object 



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# File 'lib/ceres/writer.rb', line 23

def to_proc
  target = self.target
  variable = self.variable
  block = self.block

  if target
    if block
      proc do |v|
        t = instance_variable_get(target)
        t.instance_variable_set(variable, t.instance_exec(v, &block))
      end
    else
      proc { |v| instance_variable_get(target).instance_variable_set(variable, v) }
    end
  else
    if block
      proc { |v| instance_variable_set(variable, instance_exec(v, &block)) }
    else
      proc { |v| instance_variable_set(variable, v) }
    end
  end
end

#variable ⇒ Object 



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# File 'lib/ceres/writer.rb', line 19

def variable
  @attribute.variable
end