Class: Puppet::Pops::Loader::PuppetResourceTypeImplInstantiator

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet/pops/loader/puppet_resource_type_impl_instantiator.rb

Overview

The PuppetResourceTypeImplInstantiator instantiates a Puppet::Pops::ResourceTypeImpl object. given a Puppet Programming language source that when called evaluates the Puppet logic it contains.

Class Method Summary collapse

Class Method Details

.create(loader, typed_name, source_ref, pp_code_string) ⇒ Puppet::Pops::ResourceTypeImpl

Produces an instance of Puppet::Pops::ResourceTypeImpl, or fails with an error if the given puppet source does not produce such an instance when evaluated.


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# File 'lib/puppet/pops/loader/puppet_resource_type_impl_instantiator.rb', line 17

def self.create(loader, typed_name, source_ref, pp_code_string)
  parser = Parser::EvaluatingParser.new()

  # parse and validate
  model = parser.parse_string(pp_code_string, source_ref)
  statements = if model.is_a?(Model::Program)
                 if model.body.is_a?(Model::BlockExpression)
                   model.body.statements
                 else
                   [model.body]
                 end
               else
                 EMPTY_ARRAY
               end
  statements = statements.reject { |s| s.is_a?(Model::Nop) }
  if statements.empty?
    raise ArgumentError, _("The code loaded from %{source_ref} does not create the resource type '%{type_name}' - it is empty") % { source_ref: source_ref, type_name: typed_name.name }
  end

  rname = Resource::ResourceTypeImpl._pcore_type.name
  unless statements.find do |s|
    if s.is_a?(Model::CallMethodExpression)
      functor_expr = s.functor_expr
      functor_expr.is_a?(Model::NamedAccessExpression) &&
        functor_expr.left_expr.is_a?(Model::QualifiedReference) &&
        functor_expr.left_expr.cased_value == rname &&
        functor_expr.right_expr.is_a?(Model::QualifiedName) &&
        functor_expr.right_expr.value == 'new'
    else
      false
    end
  end
    raise ArgumentError, _("The code loaded from %{source_ref} does not create the resource type '%{type_name}' - no call to %{rname}.new found.") % { source_ref: source_ref, type_name: typed_name.name, rname: rname }
  end

  unless statements.size == 1
    raise ArgumentError, _("The code loaded from %{source_ref} must contain only the creation of resource type '%{type_name}' - it has additional logic.") % { source_ref: source_ref, type_name: typed_name.name }
  end

  closure_scope = Puppet.lookup(:global_scope) { {} }
  resource_type_impl = parser.evaluate(closure_scope, model)

  unless resource_type_impl.is_a?(Puppet::Pops::Resource::ResourceTypeImpl)
    got = resource_type.class
    raise ArgumentError, _("The code loaded from %{source_ref} does not define the resource type '%{type_name}' - got '%{got}'.") % { source_ref: source_ref, type_name: typed_name.name, got: got }
  end

  unless resource_type_impl.name == typed_name.name
    expected = typed_name.name
    actual = resource_type_impl.name
    raise ArgumentError, _("The code loaded from %{source_ref} produced resource type with the wrong name, expected '%{expected}', actual '%{actual}'") % { source_ref: source_ref, expected: expected, actual: actual }
  end

  # Adapt the resource type definition with loader - this is used from logic contained in it body to find the
  # loader to use when making calls to the new function API. Such logic have a hard time finding the closure (where
  # the loader is known - hence this mechanism
  Adapters::LoaderAdapter.adapt(resource_type_impl).loader_name = loader.loader_name
  resource_type_impl
end