Class: WellActually::Mounter

Inherits:
Object
  • Object
show all
Defined in:
lib/well_actually/mounter.rb

Constant Summary collapse

BLANK_RE = 
defined?(String::BLANK_RE) ? String::BLANK_RE : /\A[[:space:]]*\z/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass:, overwrites: nil, overwrite: nil, attributes:, strict: false) ⇒ Mounter

Returns a new instance of Mounter.

Raises:

  • (ArgumentError) 


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# File 'lib/well_actually/mounter.rb', line 7

def initialize(klass:, overwrites: nil, overwrite: nil, attributes:, strict:false)
  overwrites = overwrite || overwrites
  raise ArgumentError.new("overwrite must be a symbol or an array of symbols") unless overwrites.is_a?(Symbol) || (overwrites.is_a?(Array) && overwrites.all?{|a| a.is_a?(Symbol)})
  raise ArgumentError.new("attributes must be an array of symbols") unless attributes.is_a?(Array) && attributes.all?{|a| a.is_a?(Symbol)}
  @klass = klass
  @overwrites = overwrites
  @attributes = attributes.uniq
  @strict = strict
end

Instance Attribute Details

#attributes ⇒ Object (readonly)

Returns the value of attribute attributes.



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# File 'lib/well_actually/mounter.rb', line 3

def attributes
  @attributes
end

#klass ⇒ Object (readonly)

Returns the value of attribute klass.



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# File 'lib/well_actually/mounter.rb', line 3

def klass
  @klass
end

#overwrites ⇒ Object (readonly)

Returns the value of attribute overwrites.



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# File 'lib/well_actually/mounter.rb', line 3

def overwrites
  @overwrites
end

#strick ⇒ Object (readonly)

Returns the value of attribute strick.



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# File 'lib/well_actually/mounter.rb', line 3

def strick
  @strick
end

Instance Method Details

#mount ⇒ Object 



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# File 'lib/well_actually/mounter.rb', line 17

def mount
  klass.class_variable_set(:@@well_actually_attributes, attributes.map{|_attr| _attr.to_s})
  klass.class_variable_set(:@@well_actually_overwrites, [*overwrites])
  klass.class_variable_set(:@@well_actually_strict, strick)

  klass.send(:define_singleton_method, :well_actually_attributes) do
    self.class_variable_get(:@@well_actually_attributes)
  end

  klass.send(:define_method, :well_actually_attributes) do
    self.class.well_actually_attributes
  end

  klass.send(:define_singleton_method, :well_actually_overwrites) do
    self.class_variable_get(:@@well_actually_overwrites)
  end

  klass.send(:define_singleton_method, :well_actually_strict) do
    self.class_variable_get(:@@well_actually_strict)
  end

  klass.send(:define_method, :well_actually_overwrites) do
    self.class.well_actually_overwrites.map do |overwrite|
      self.public_send(overwrite) if (self.respond_to?(overwrite) ||  self.class.well_actually_strict)
    end.compact.reduce({}) do |result, overwrite|
      result.merge(overwrite || {}) do |key, v1, v2|
        v1 = nil unless self.well_actually_overwrite_value_check(key, v1)
        v2 = nil unless self.well_actually_overwrite_value_check(key, v2)
        v1.nil? ? v2 : v1
      end
    end
  end

  klass.send(:define_method, :well_actually?) do
    !!self.instance_variable_get(:@well_actually)
  end

  klass.send(:define_method, :well_actually) do
    self.clone.tap do |actually|
      actually.readonly! if actually.respond_to?(:readonly!)
      actually.instance_variable_set(:@well_actually, true)
      self.send(:well_actually_overwrite_safe).each do |_attr, _value|
        if actually.respond_to?(:"#{_attr}=")
          actually.public_send(:"#{_attr}=", _value)
        else
          actually.instance_variable_set(:"@#{_attr}", _value)
        end
      end
    end
  end

  klass.send(:define_method, :well_actually_overwrite_safe) do
    (self.well_actually_overwrites || {}).select do |key, value|
      self.well_actually_overwrite_value_check(key, value)
    end
  end

  klass.send(:define_method, :well_actually_overwrite_value_check) do |key, value|
    self.well_actually_attributes.include?(key) && !value.nil? && (!value.is_a?(String) || !value.match(BLANK_RE))
  end
end