Class: Transformator::Transformation

Inherits:
Object
  • Object
show all
Includes:
Dsl
Defined in:
lib/transformator/transformation.rb

Instance Method Summary collapse

Methods included from Dsl

#array, #cdata, #element, #element_from_xml, #elements_from_hash, #elements_from_xml, #find, #find_all, #xml_from_element

Constructor Details

#initialize(options = {}, &block) ⇒ Transformation

Returns a new instance of Transformation.



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# File 'lib/transformator/transformation.rb', line 5

def initialize(options = {}, &block)
  # make it possible to initialize a transformation with external data
  options.each_pair do |key, value|
    instance_variable_set "@#{key}".to_sym, value
  end

  @rules = []
  self.instance_eval(&block) if block
end

Instance Method Details

#apply(options = {}) ⇒ Object 



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# File 'lib/transformator/transformation.rb', line 18

def apply(options = {})
  source = Transformator.document_from_object(options[:source] ||= options[:to])
  target = Transformator.document_from_object(options[:target])

  @rules.each do |rule|
    block = rule[:callable]
    path = rule[:path]
    type = rule[:type]

    # allow user to set source/target freely
    _source =
    if (source_callable = rule[:source]).respond_to?(:call)
      source_callable.call
    else
      source
    end

    _target =
    if (target_callable = rule[:target]).respond_to?(:call)
      target_callable.call
    else
      target
    end

    if type == :process
      if path.is_a?(Array)
        block.call(
          path.map do |_path| { _path => find_all(_source, _path) } end,
          _target
        )
      elsif path.is_a?(String)
        find_all(_source, path).each do |element_to_process|
          block.call(element_to_process, _target)
        end
      elsif path.is_a?(Symbol)
        if path == :document
          block.call(_source, _target)
        elsif path == :none
          block.call
        elsif path == :source
          block.call(source, _target)
        elsif path == :target
          block.call(target, _target)
        end
      end
    end
  end

  case options[:output_format] || @output_format || Transformator.determine_format(options[:source])
  when :hash then Transformator.hash_from_document(target)
  when :ox_document then target
  when :xml then Ox.dump(target, with_xml: true)
  else raise "Unknown output format!"
  end
end