Class: Decay::Metaprogramming

Inherits:
Object
  • Object
show all
Defined in:
lib/decay/metaprogramming.rb

Instance Method Summary collapse

Constructor Details

#initialize(class:, enumerated_type:, enumerated_type_name:) ⇒ Metaprogramming

Returns a new instance of Metaprogramming.



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# File 'lib/decay/metaprogramming.rb', line 3

def initialize(class:, enumerated_type:, enumerated_type_name:)
  @klass = binding.local_variable_get(:class)
  @enumerated_type = enumerated_type
  @enumerated_type_name = enumerated_type_name
end

Instance Method Details

#define_active_record_attribute ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 71

def define_active_record_attribute
  @klass.attribute @enumerated_type_name, \
    Decay::ActiveEnumAttribute.new(enum: @enumerated_type)
end

#define_active_record_bang_setters ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 76

def define_active_record_bang_setters
  enumerated_type_name = @enumerated_type_name

  @enumerated_type.each do |key, _value|
    if key.nil?
      next
    end

    assert_instance_conflict_free("#{key}!")
    @klass.send(:define_method, "#{key}!") do
      send("#{enumerated_type_name}=", key)
    end
  end
end

#define_active_record_question_getters ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 91

def define_active_record_question_getters
  enumerated_type_name = @enumerated_type_name

  @enumerated_type.each do |key, value|
    if key.nil?
      next
    end

    assert_instance_conflict_free("#{key}?")
    @klass.send(:define_method, "#{key}?") do
      send(enumerated_type_name) == value
    end
  end
end

#define_active_record_scopes ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 106

def define_active_record_scopes
  enumerated_type_name = @enumerated_type_name

  @enumerated_type.each do |key, value|
    if key
      assert_scope_conflict_free(key)
      @klass.scope key, -> { where(enumerated_type_name => value.value) }
    end
  end
end

#define_bang_setters ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 41

def define_bang_setters
  enumerated_type_name = @enumerated_type_name

  @enumerated_type.each do |key, value|
    if key.nil?
      next
    end

    assert_instance_conflict_free("#{key}!")
    @klass.send(:define_method, "#{key}!") do
      instance_variable_set("@#{enumerated_type_name}", value)
    end
  end
end

#define_enumerated_type ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 9

def define_enumerated_type
  @klass.const_set(@enumerated_type_name.to_s.upcase, @enumerated_type)
end

#define_getter ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 13

def define_getter
  enumerated_type_name = @enumerated_type_name

  assert_instance_conflict_free(enumerated_type_name)
  @klass.send(:define_method, enumerated_type_name) do
    instance_variable_get("@#{enumerated_type_name}")
  end
end

#define_question_getters ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 56

def define_question_getters
  enumerated_type_name = @enumerated_type_name

  @enumerated_type.each do |key, value|
    if key.nil?
      next
    end

    assert_instance_conflict_free("#{key}?")
    @klass.send(:define_method, "#{key}?") do
      instance_variable_get("@#{enumerated_type_name}") == value
    end
  end
end

#define_setter ⇒ Object 



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# File 'lib/decay/metaprogramming.rb', line 22

def define_setter
  enumerated_type = @enumerated_type
  enumerated_type_name = @enumerated_type_name

  assert_instance_conflict_free("#{enumerated_type_name}=")
  @klass.send(:define_method, "#{enumerated_type_name}=") do |new_value|
    value =
      if new_value.respond_to?(:to_sym)
        new_value.to_sym
      else
        new_value
      end

    enum = enumerated_type[value]

    instance_variable_set("@#{enumerated_type_name}", enum)
  end
end