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 



5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
 
# 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)
      ActiveSupport::Notifications.instrument "#{method_name}.megatron" do
        # 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
  )
end