Class: Orthoses::DelegateClass

Inherits:
Object
  • Object
show all
Defined in:
lib/orthoses/delegate_class.rb

Defined Under Namespace

Modules: Hook

Instance Method Summary collapse

Constructor Details

#initialize(loader) ⇒ DelegateClass

Returns a new instance of DelegateClass.



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# File 'lib/orthoses/delegate_class.rb', line 11

def initialize(loader)
  @loader = loader
end

Instance Method Details

#call ⇒ Object 



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# File 'lib/orthoses/delegate_class.rb', line 15

def call
  require 'delegate'
  ::Class.prepend(Hook)

  inherited = CallTracer.new

  delegate_class_super_map = {}
  delegate_class_tracer = TracePoint.new(:return) do |tp|
    return_value = tp.return_value
    superclass = tp.binding.local_variable_get(:superclass)
    delegate_class_super_map[return_value] = superclass
  end

  store = delegate_class_tracer.enable(target: method(:DelegateClass)) do
    inherited.trace(Hook.instance_method(:inherited)) do
      @loader.call
    end
  end

  store["Class"].body.delete("prepend Orthoses::DelegateClass::Hook")

  inherited.captures.each do |capture|
    superclass = capture.method.receiver
    if delegate_to_class = delegate_class_super_map[superclass]
      subclass = capture.argument[:subclass]
      subclass_name = Utils.module_name(subclass)
      next unless subclass_name

      delegate_to_class_name = Utils.module_name(delegate_to_class)
      next unless delegate_to_class_name

      header = "class #{subclass_name} < ::#{delegate_to_class_name}#{temporary_type_params(delegate_to_class_name)}"
      store[subclass_name].header = header
    end
  end

  store
end

#temporary_type_params(name) ⇒ Object 



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# File 'lib/orthoses/delegate_class.rb', line 54

def temporary_type_params(name)
  Utils.known_type_params(name)&.then do |params|
    if params.empty?
      nil
    else
      "[#{params.map { :untyped }.join(', ')}]"
    end
  end
end