Class: Extractor

Inherits:
Object
  • Object
show all
Defined in:
lib/roundtrip_xml/extractor.rb

Instance Method Summary collapse

Constructor Details

#initialize(roxml_objs, runtime, root_class, definitions = nil, &block) ⇒ Extractor

Returns a new instance of Extractor.



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# File 'lib/roundtrip_xml/extractor.rb', line 13

def initialize(roxml_objs, runtime, root_class, definitions = nil, &block)
  @roxml_objs = roxml_objs
  @runtime = runtime
  @root_class = root_class
  @definitions = {}
  if block_given?
    eval_definitions root_class, &block
  else
    definitions.each {|defin| eval_definitions root_class, defin } if definitions
  end
end

Instance Method Details

#add_old_metadata(obj, old_metadata, current_metadata) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 123

def add_old_metadata(obj, old_metadata, current_metadata)
  # only keep the keys that don't exist in the template's metadata (current)
  # that metadata will be availabled when evaluate the roxml object
  # obj._metadata = old_metadata.merge current_metadata
  diff_keys = old_metadata.keys.inject([]) do |out, key|
    out << key unless current_metadata.key? key
    out
  end
  new_metadata = old_metadata.delete_if {|k, _| !diff_keys.include? k}
  obj._metadata = new_metadata
end

#convert_roxml_obj(obj) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 89

def convert_roxml_obj (obj)
  name = obj.class.class_name
  old_metadata = obj._metadata
  defs = @definitions[name]

  defs.each do |defin|
    diffs = diff_definition(defin, obj)
    if diffs.all? {|diff| diff.operation == '~' && (diff.template_val.is_a?(Utils::UndefinedParam) || diff.template_val == nil || interpolated_diff(diff)) }
      new_obj = defin.class.new
      param_values = diffs.inject({}) do |values, diff|
        name = diff.template_val ? diff.template_val.name : diff.key
        values[name] = interpolated_diff(diff) ? extract_interpolated_diff(diff) : diff.obj_val
        values
      end
      set_attributes new_obj, param_values
      # return convert_roxml_obj new_obj
      add_old_metadata new_obj, old_metadata, defin._metadata
      obj = new_obj
    end
  end if defs

  obj.class.roxml_attrs.each do |a|
    if a.array?
      elements = a.sought_type.class == Class ?
        obj.send(a.accessor).map {|el| convert_roxml_obj el} : obj.send(a.accessor)
      obj.send a.setter.to_sym, elements
    elsif a.sought_type.class == Class
      current_value = obj.send(a.accessor)
      obj.send a.setter.to_sym, convert_roxml_obj(current_value) if current_value
    end
  end
  obj
end

#convert_roxml_objs ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 82

def convert_roxml_objs
  def_names = @definitions.keys
  @roxml_objs.map do |obj|
    convert_roxml_obj obj
  end
end

#diff_definition(defin, obj) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 56

def diff_definition(defin, obj)
  def_hash = defin.to_hash
  obj_hash = obj.to_hash
  [def_hash, obj_hash].each do |h|
    h.delete '__class'
  end
  diffs = HashDiff.diff(obj_hash, def_hash).map do |diff|
    accessor_name = if diff[3].is_a?(String) && match = diff[3].match(/#{Utils::UNDEFINED_PARAM}:(\w*)/)
                      match[1].to_sym
                    end
    if accessor_name && defin.class.plain_accessors.include?(accessor_name)
      matcher = defin.class.plain_accessors(true)[accessor_name]
    end
    template_val = diff[3].is_a?(String) && accessor_name ? Utils::UndefinedParam.new(accessor_name, diff[3]) : diff[3]
    ROXMLDiff.new diff[0], diff[1], from_hash(diff[2]), template_val, matcher
  end

  diffs
end

#eval_definitions(root_class, str = nil, &block) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 25

def eval_definitions(root_class, str = nil, &block)
  if block_given?
    @runtime.evaluate_raw '', root_class, &block
  else
    @runtime.evaluate_raw str, root_class
  end
  def_names = @runtime.instance_variable_get(:@classes).inject([]) do |out, (name, clazz)|
    out << name if clazz.subclass?
    out
  end
  @definitions = def_names.inject(@definitions) do |out, name|
    clazz = @runtime.fetch(name)
    parent = get_root_class clazz
    obj = clazz.new
    cleanroom = @runtime.create_cleanroom clazz, true
    cleanroom.get_el.process.each { |p| cleanroom.evaluate &p }
    out[parent] ||= []
    out[parent] << cleanroom.get_el
    out
  end
end

#extract_interpolated_diff(diff) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 139

def extract_interpolated_diff(diff)
  s_diff = Differ.diff_by_word(diff.obj_val, diff.template_val.original).to_s
  value = s_diff.match(/(\{"\s*#{Utils::UNDEFINED_PARAM}:([\S]*)\s*" >> "(.*)"})/)[3]
  value.strip.match(diff.matcher)[1]
end

#from_hash(hash) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 76

def from_hash(hash)
  return hash unless hash.is_a? Hash
  @runtime.fetch(hash['__class']).from_hash @runtime, hash

end

#get_root_class(clazz) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 47

def get_root_class(clazz)
  super_clazz = @runtime.fetch clazz.superclass.class_name
  if super_clazz.subclass?
    get_root_class super_clazz
  else
    super_clazz.class_name
  end
end

#interpolated_diff(diff) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 135

def interpolated_diff(diff)
  diff.obj_val.is_a?(String) && diff.template_val.is_a?(Utils::UndefinedParam) && diff.template_val.original && diff.template_val.original.match(/#{Utils::UNDEFINED_PARAM}:/)
end

#set_attributes(obj, params) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 145

def set_attributes(obj, params)
  params.each do |param, val|
    methods = param.to_s.split '.'
    methods << val
    set_deep_attributes obj, methods
    # obj.send "#{param}=", val
  end

end

#set_deep_attributes(obj, methods) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 155

def set_deep_attributes(obj, methods)
  index = methods[0].match(/\[(\d+)\]/)
  child = index ? nil : obj.send(methods[0])
  method = methods[0]
  method.gsub!(/\[\d+\]/, '')
  if child
    set_deep_attributes child, methods[1..methods.size]
  else
    if index
      arr = obj.send(method) || []
      arr[Integer(index[1])] = methods[1..1][0] # hacky way to get second element
      obj.send("#{method}=", arr)
    else
      obj.send(methods[0] + '=', set_deep_attributes_helper(obj, methods))
    end
  end
end

#set_deep_attributes_helper(obj, methods) ⇒ Object 



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# File 'lib/roundtrip_xml/extractor.rb', line 173

def set_deep_attributes_helper(obj, methods)
  method = methods.shift
  index = method.match(/\[(\d+)\]/)
  return obj.send(method + '=', methods.first) if !index && methods.size == 1

  method.gsub!(/\[\d+\]/, '')
  child = obj.send(method)
  unless child || methods.size == 1
    clazz_name = method.dup
    clazz_name[0] = clazz_name[0].upcase
    child = @runtime.fetch(clazz_name.to_sym).new
    obj.send("#{method}=", child)

  end
  if index
    arr = obj.send(method) || []
    arr[Integer(index[1])] = methods.first
    obj.send("#{method}=", arr)
  else
    obj.send(method + '=', set_deep_attributes_helper(child, methods))
  end

  child.is_a?(Array) ? obj : child || obj
end