class Puppet::Pops::Loader::RubyFunctionInstantiator

The RubyFunctionInstantiator instantiates a Puppet::Functions::Function given the ruby source that calls Puppet::Functions.create_function.

Public Class Methods

create(loader, typed_name, source_ref, ruby_code_string) click to toggle source

Produces an instance of the Function class with the given typed_name, or fails with an error if the given ruby source does not produce this instance when evaluated.

@param loader [Puppet::Pops::Loader::Loader] The loader the function is associated with @param typed_name [Puppet::Pops::Loader::TypedName] the type / name of the function to load @param source_ref [URI, String] a reference to the source / origin of the ruby code to evaluate @param ruby_code_string [String] ruby code in a string

@return [Puppet::Pops::Functions.Function] - an instantiated function with global scope closure associated with the given loader

# File lib/puppet/pops/loader/ruby_function_instantiator.rb, line 15
def self.create(loader, typed_name, source_ref, ruby_code_string)
  unless ruby_code_string.is_a?(String) && ruby_code_string =~ /Puppet\:\:Functions\.create_function/
    raise ArgumentError, "The code loaded from #{source_ref} does not seem to be a Puppet 4x API function - no create_function call."
  end
  created = eval(ruby_code_string, nil, source_ref, 1)
  unless created.is_a?(Class)
    raise ArgumentError, "The code loaded from #{source_ref} did not produce a Function class when evaluated. Got '#{created.class}'"
  end
  unless created.name.to_s == typed_name.name()
    raise ArgumentError, "The code loaded from #{source_ref} produced mis-matched name, expected '#{typed_name.name}', got #{created.name}"
  end
  # create the function instance - it needs closure (scope), and loader (i.e. where it should start searching for things
  # when calling functions etc.
  # It should be bound to global scope

  # TODO: Cheating wrt. scope - assuming it is found in the context
  closure_scope = Puppet.lookup(:global_scope) { {} }
  created.new(closure_scope, loader.private_loader)
end