Class: Expo

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

Defined Under Namespace

Classes: Proxy

Constant Summary collapse

CALL_ORDER = 
[:aside, :expose, :sub_expo, :collection]
TRIVIAL_PRESENTER = 
Class.new do
  def present(object)
    object
  end
end.new

Instance Method Summary collapse

Constructor Details

#initialize(presenter = nil, &block) ⇒ Expo

Returns a new instance of Expo.



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# File 'lib/expo.rb', line 10

def initialize(presenter=nil, &block)
  @presenter = presenter
  @block = block
  @message_map = {}
  @subs = {}
  @collections = {}
  @inner_calls = []
  @id = self.object_id
end

Instance Method Details

#aside(*messages) ⇒ Object 



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# File 'lib/expo.rb', line 65

def aside(*messages)
  array, hash = parse_arguments(messages)
  @context.merge!(hasherize(array) {|msg| @preso.send(msg) })
  hash.each do |k,v|
    @context[v] = @preso.send(k)
  end
  nil
end

#collection(key, collection, item_expo) ⇒ Object 



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# File 'lib/expo.rb', line 89

def collection(key, collection, item_expo)
  @inner_calls << {
    method: :collection_inner,
    args: [key, collection, item_expo],
    block: nil
  }
  nil
end

#expo(object, context = {}) ⇒ Object 



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# File 'lib/expo.rb', line 33

def expo(object, context={})

  @object = object
  @context = context
  if object.nil?
    return nil
  end
  @preso = Proxy.new(
    object,
    (@presenter || TRIVIAL_PRESENTER).present(object)
  )
  if !@block
    return {}
  end
  block_return = self.instance_exec @object, context, &@block
  @inner_calls.each do |call|
    self.send(call[:method], *call[:args], &call[:block])
  end
  exposition = {}
  @message_map.each do |k,v|
    exposition[v] = @preso.send(k)
  end
  exposition.merge!(@subs)
  exposition.merge!(@collections)
  self.reset
  if block_return
    exposition.merge(block_return)
  else
    exposition
  end
end

#expo_collection(objects, context = {}) ⇒ Object 



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# File 'lib/expo.rb', line 20

def expo_collection(objects, context={})
  objects.map.with_index do |object, index|
    Expo.new(@presenter, &@block).expo(object, context.merge({index: index}))
  end
end

#expose(*messages) ⇒ Object 



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# File 'lib/expo.rb', line 74

def expose(*messages)
  array, hash = parse_arguments(messages)
  @message_map.merge!(hasherize(array).merge(hash))
  nil
end

#reset ⇒ Object 



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# File 'lib/expo.rb', line 26

def reset
  @message_map = {}
  @subs = {}
  @collections = {}
  @inner_calls = []
end

#sub_expo(key, object, sub_expo_passed) ⇒ Object 



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# File 'lib/expo.rb', line 80

def sub_expo(key, object, sub_expo_passed)
  @inner_calls << {
    method: :sub_expo_inner,
    args: [key, object, sub_expo_passed],
    block: nil
  }
  nil
end