module Cucumber::LanguageSupport::LanguageMethods

def add_hook(phase, hook)
  hooks[phase.to_sym] << hook
  hook
end

def add_transform(transform)
  transforms.unshift transform
  transform
end

def after(scenario)
  execute_after(scenario)
  end_scenario
end

def after_configuration(configuration)
  hooks[:after_configuration].each do |hook|
    hook.invoke('AfterConfiguration', configuration)
  end
end

def around(scenario)
  execute_around(scenario) do
    yield
  end
end

def available_step_definition(regexp_source, file_colon_line)
  available_step_definition_hash[StepDefinitionLight.new(regexp_source, file_colon_line)] = nil
end

def available_step_definition_hash
  @available_step_definition_hash ||= {}
end

def before(scenario)
  begin_scenario(scenario)
  execute_before(scenario)
end

def clear_hooks
  @hooks = nil
end

def execute_after(scenario)
  hooks_for(:after, scenario).reverse_each do |hook|
    invoke(hook, 'After', scenario, true)
  end
end

def execute_after_step(scenario)
  hooks_for(:after_step, scenario).each do |hook|
    invoke(hook, 'AfterStep', scenario)
  end
end

def execute_around(scenario, &block)
  hooks_for(:around, scenario).reverse.inject(block) do |blk, hook|
    proc do
      invoke(hook, 'Around', scenario, true) do
        blk.call(scenario)
      end
    end
  end.call
end

def execute_before(scenario)
  hooks_for(:before, scenario).each do |hook|
    invoke(hook, 'Before', scenario, true)
  end
end

def execute_transforms(args)
  args.map do |arg|
    matching_transform = transforms.detect {|transform| transform.match(arg) }
    matching_transform ? matching_transform.invoke(arg) : arg
  end
end

def hooks
  @hooks ||= Hash.new{|h,k| h[k] = []}
end

def hooks_for(phase, scenario) #:nodoc:
  hooks[phase.to_sym].select{|hook| scenario.accept_hook?(hook)}
end

def invoke(hook, location, scenario, exception_fails_scenario, &block)
  begin
    hook.invoke(location, scenario, &block)
  rescue Exception => exception
    if exception_fails_scenario
      scenario.fail!(exception)
    else
      raise
    end
  end
end

def invoked_step_definition(regexp_source, file_colon_line)
  invoked_step_definition_hash[StepDefinitionLight.new(regexp_source, file_colon_line)] = nil
end

def invoked_step_definition_hash
  @invoked_step_definition_hash ||= {}
end

def transforms
  @transforms ||= []
end

def unmatched_step_definitions
  available_step_definition_hash.keys - invoked_step_definition_hash.keys
end