class Smartdown::Engine

Attributes

flow[R]

Public Class Methods

new(flow, initial_state = {}) click to toggle source
# File lib/smartdown/engine.rb, line 10
def initialize(flow, initial_state = {})
  @flow = flow
  @initial_state = initial_state
end

Public Instance Methods

build_start_state() click to toggle source
# 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() click to toggle source
# File lib/smartdown/engine.rb, line 23
def default_predicates
  {}.merge(@initial_state)
end
evaluate_node(state) click to toggle source
# 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) click to toggle source
# 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