#
#       ActiveFacts CQL loader.
#       Use Polyglot to patch things so you can *require* a CQL file and have it define a Ruby module.
#
# Copyright (c) 2009 Clifford Heath. Read the LICENSE file.
#
require 'rubygems'
require 'polyglot'
require 'activefacts/support'
require 'activefacts/input/cql'
require 'activefacts/generate/ruby'

module ActiveFacts
  # This class has a load method for Polyglot to tell it how to _require_ a CQL file.
  # The CQL file is parsed to a vocabulary constellation, which is generated
  # to Ruby code and eval'd, making the generated classes available.
  # To make this Loader available, simply
  #   require 'activefacts/cql'
  class CQLLoader
    def self.load(file) #:nodoc:
      debug "Loading #{file}" do
        vocabulary = ActiveFacts::Input::CQL.readfile(file)

        ruby = StringIO.new
        @dumper = ActiveFacts::Generate::RUBY.new(vocabulary.constellation)
        @dumper.generate(ruby)
        ruby.rewind
        eval ruby.read, ::TOPLEVEL_BINDING
      end
    end
  end

  Polyglot.register('cql', CQLLoader)
end