Module: Spy::Instance::API::Internal

Defined in:
lib/spy/instance/api/internal.rb

Overview

The API we expose internally to our collaborators

Instance Method Summary collapse

Instance Method Details

#attach_to(target) ⇒ Object

TODO: Not sure if this is the best place for this

Defines the spy on the target object



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# File 'lib/spy/instance/api/internal.rb', line 11

def attach_to(target)
  spy = self
  target.class_eval do
    define_method spy.original.name do |*args, &block|
      spy.call(self, *args, &block)
    end
    send(spy.visibility, spy.original.name)
  end
end

#call(receiver, *args, &block) ⇒ Object

Call the spied method using the given receiver and arguments.

receiver is required to allow calling of UnboundMethods such as instance methods defined on a Class



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# File 'lib/spy/instance/api/internal.rb', line 25

def call(receiver, *args, &block)
  # TODO - abstract the method call into an object and cache this in
  #   method using an instance variable instead of a local variable.
  #   This will let us be a bit more elegant about how we do before/after
  #   callbacks. We can also merge MethodCall with this responsibility so
  #   it isn't just a data struct
  is_active = if @conditional_filters.any?
                mc = build_method_call(receiver, *args, &block)
                @conditional_filters.all? {|f| f.call(mc)}
              else
                true
              end

  return call_original(receiver, *args, &block) if !is_active

  if @before_callbacks.any?
    mc = build_method_call(receiver, *args, &block)
    @before_callbacks.each {|f| f.call(mc)}
  end

  if @around_procs.any?
    mc = build_method_call(receiver, *args, &block)

    # Procify the original call
    # Still return the result from it
    result = nil
    original_proc = Proc.new do
      result = call_and_record(receiver, args, { :record => mc }, &block)
    end

    # Keep wrapping the original proc with each around_proc
    @around_procs.reduce(original_proc) do |p, wrapper|
      Proc.new { wrapper.call(mc, &p) }
    end.call
  else
    result = call_and_record(receiver, args, &block)
  end

  if @after_callbacks.any?
    mc = @call_history.last
    @after_callbacks.each {|f| f.call(mc)}
  end

  result
end