Class: BehaviorFactory

Inherits:
Object show all
Defined in:
lib/gamebox/core/behavior_factory.rb

Overview

BehaviorFactory is in charge of creating all behaviors and placing them in an Actor. Everything you want an Actor to do is part of a Behavior. Actors are stupid buckets of data. Behaviors can be created by:

has_behavior in an Actor's class definition
or by dynamically creating one at runtime via another behavior.

Instance Method Summary collapse

Instance Method Details

#add_behavior(actor, behavior_name, opts = {}) ⇒ Object

Build a behavior.

add_behavior(actor, :shootable) or add_behavior(actor, :shootable, :range=>3)
this will create a new instance of Shootable and pass :range=>3 to it



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# File 'lib/gamebox/core/behavior_factory.rb', line 11

def add_behavior(actor, behavior_name, opts = {})
  raise "nil actor" if actor.nil?
  raise "nil behavior definition" if behavior_name.nil?

  behavior_definition = Behavior.definitions[behavior_name]

  raise "unknown behavior #{behavior_name}" unless behavior_definition
  context = actor.this_object_context
  context.in_subcontext do |behavioral_context|
    behavioral_context[:behavior].tap do |behavior|
      reqs = behavior_definition.required_injections
      if reqs
        reqs.each do |req|
          object = context[req]
          behavior.define_singleton_method req do
            components[req] 
          end
          components = behavior.send :components
          components[req] = object
        end
      end

      helpers = behavior_definition.helpers_block
      if helpers
        helpers_module = Module.new &helpers
        behavior.extend helpers_module
      end

      behavior.define_singleton_method :react_to, behavior_definition.react_to_block if behavior_definition.react_to_block

      deps = behavior_definition.required_behaviors
      if deps
        deps.each do |beh|
          add_behavior actor, beh unless actor.has_behavior?(beh)
        end
      end

      behavior.opts = opts
      behavior.instance_eval &behavior_definition.setup_block if behavior_definition.setup_block

      if behavior_definition.remove_block
        behavior.define_singleton_method :remove, behavior_definition.remove_block 
        behavior.reacts_with :remove
      end

      actor.add_behavior behavior_name, behavior
    end
  end
end