Class: Smartdown::Engine

Inherits:
Object
  • Object
show all
Defined in:
lib/smartdown/engine.rb,
lib/smartdown/engine/state.rb,
lib/smartdown/engine/errors.rb,
lib/smartdown/engine/transition.rb,
lib/smartdown/engine/interpolator.rb,
lib/smartdown/engine/node_presenter.rb,
lib/smartdown/engine/conditional_resolver.rb

Defined Under Namespace

Classes: ConditionalResolver, IndeterminateNextNode, Interpolator, NodePresenter, State, Transition, UndefinedValue

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(flow, initial_state = {}) ⇒ Engine

Returns a new instance of Engine.



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# File 'lib/smartdown/engine.rb', line 10

def initialize(flow, initial_state = {})
  @flow = flow
  @initial_state = initial_state
end

Instance Attribute Details

#flow ⇒ Object (readonly)

Returns the value of attribute flow.



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# File 'lib/smartdown/engine.rb', line 8

def flow
  @flow
end

Instance Method Details

#build_start_state ⇒ Object 



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# File 'lib/smartdown/engine.rb', line 15

def build_start_state
  Smartdown::Engine::State.new(
    default_predicates.merge(
      current_node: flow.name
    )
  )
end

#default_predicates ⇒ Object 



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# File 'lib/smartdown/engine.rb', line 23

def default_predicates
  {}.merge(@initial_state)
end

#evaluate_node(state) ⇒ Object 



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# File 'lib/smartdown/engine.rb', line 53

def evaluate_node(state)
  current_node = flow.node(state.get(:current_node))
  NodePresenter.new.present(current_node, state)
end

#process(unprocessed_responses, test_start_state = nil) ⇒ Object 



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# File 'lib/smartdown/engine.rb', line 27

def process(unprocessed_responses, test_start_state = nil)
  state = test_start_state || build_start_state   

  while !unprocessed_responses.empty? do
    current_node = flow.node(state.get(:current_node))
    break if current_node.is_outcome_page_node?
    
    if current_node.is_start_page_node?
      # If it's a start page node, we've got to do something different because of the preceeding 'y' answer
      answers = unprocessed_responses.shift(1)
    else
      answers = current_node.questions.map do |question|
        question.answer_type.new(unprocessed_responses.shift, question)
      end
      if answers.any?(&:invalid?)
        state = state.put(:current_answers, answers)
        break
      end
    end
    
    transition = Transition.new(state, current_node, answers)
    state = transition.next_state 
  end
  state
end