Module: Epuber::DSL::AttributeSupport

Included in:
Object
Defined in:
lib/epuber/dsl/attribute_support.rb

Instance Method Summary collapse

Instance Method Details

#attribute(name, options = {}) ⇒ Object

Method to create attribute for DSL object

Examples:

attribute :name
attribute :title, required: true, inherited: true

Parameters:

  • name (Symbol) —

    attribute name

  • options (Hash) (defaults to: {})

Returns:

  • nil

See Also:



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# File 'lib/epuber/dsl/attribute_support.rb', line 19

def attribute(name, options = {})
  attr = Attribute.new(name, **options)

  dsl_attributes[name] = attr

  define_method_attr(name, attr)
end

#define_method_attr(name, attr) ⇒ Object

Returns nil.

Parameters:

Returns:

  • nil



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# File 'lib/epuber/dsl/attribute_support.rb', line 52

def define_method_attr(name, attr)
  key = name

  # define normal getter
  define_method(key) do
    value = @attributes_values[key]

    if !value.nil?
      # has value -> return it
      value

    elsif attr.inherited? && respond_to?(:parent) && !parent.nil?
      # hasn't value –> try to find it in parent
      parent.send(key)

    elsif !attr.default_value.nil?
      # just return the default value
      attr.converted_value(attr.default_value)
    end
  end

  # define normal setter
  define_method(attr.writer_name) do |value|
    if attr.singularize?
      array_value = if value.is_a? Array
                      value
                    else
                      [value]
                    end

      mapped = array_value.map { |one_value| attr.converted_value(one_value) }

      @attributes_values[key] = mapped
    else
      begin
        @attributes_values[key] = attr.converted_value(value)
      rescue StandardError => e
        UI.warning("Invalid value `#{value}` for attribute `#{name}`, original error `#{e}`",
                   location: caller_locations[1])
      end
    end
  end

  return unless attr.singularize?

  # define singular methods
  singular_key = key.to_s.singularize.to_sym

  define_method(singular_key) do
    value = @attributes_values[key]

    if attr.singularize? && value.is_a?(Array)
      value.first
    else
      value
    end
  end

  define_method(attr.writer_singular_form) do |value|
    if attr.singularize?
      array_value = if value.is_a?(Array)
                      value
                    else
                      [value]
                    end

      @attributes_values[key] = array_value.map { |one_value| attr.converted_value(one_value) }
    else
      @attributes_values[key] = attr.converted_value(value)
    end
  end
end

#dsl_attributes ⇒ Hash<Symbol, Attribute>

All DSL attributes

Returns:



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# File 'lib/epuber/dsl/attribute_support.rb', line 31

def dsl_attributes
  @dsl_attributes ||= {}
end

#find_root(instance) ⇒ Object

Returns:



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# File 'lib/epuber/dsl/attribute_support.rb', line 37

def find_root(instance)
  return unless instance.respond_to?(:parent)

  if instance.parent.nil?
    instance
  else
    find_root(instance.parent)
  end
end