Class: Megatron::Helper

Inherits:
BlockHelpers::Base
  • Object
show all
Defined in:
lib/megatron/helper.rb

Class Method Summary collapse

Class Method Details

.inherited(klass) ⇒ Object 



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# File 'lib/megatron/helper.rb', line 5

def inherited(klass)
  # Define the helper method
  # e.g. for a class:
  #   class HelloHelper < BlockHelpers::Base
  #     #.....
  #   end
  #
  # then we define a helper method 'hello_helper'
  #
  method_name = klass.name.split('::').last.underscore
  klass.parent.class_eval %(
    def #{method_name}(*args, &block)
      # Get the current helper object which has all the normal helper methods
      if self.is_a?(BlockHelpers::Base) 
        top_level_helper = self.helper
        parent_block_helper = self
      else
        top_level_helper = self
        parent_block_helper = nil
      end
      
      # We need to save the current helper and parent block helper in the class so that
      # it's visible to the renderer's 'initialize' method...
      #{klass.name}.current_helper = top_level_helper
      #{klass.name}.current_parent_block_helper = parent_block_helper
      renderer = #{klass.name}.new(*args)
      # ...then set them anyway on the renderer so that renderer methods can use it
      renderer.send(:helper=, top_level_helper)
      renderer.send(:parent=, parent_block_helper)
      body = block ? capture(renderer, &block) : nil
      processed_body = renderer.display(body)
      if processed_body
        # If concat is the old rails/merb version with 2 args...
        if top_level_helper.method(:concat).arity == 2
          concat processed_body, binding
        # ...otherwise call with one arg
        else
          concat processed_body
        end
        
      end
      renderer
    end
  )
end