Module: SmartInit

Included in:
Base
Defined in:
lib/smart_init.rb,
lib/smart_init/main.rb,
lib/smart_init/version.rb

Defined Under Namespace

Classes: Base

Constant Summary collapse

VERSION = 
"4.1.1"

Instance Method Summary collapse

Instance Method Details

#initialize_with_args(*attributes) ⇒ Object 



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# File 'lib/smart_init/main.rb', line 73

def initialize_with_args *attributes
  define_method :initialize do |*parameters|
    if attributes.count != parameters.count
      raise ArgumentError, "wrong number of arguments (given #{parameters.count}, expected #{attributes.count})"
    end

    attributes.zip(parameters).each do |pair|
      name = pair[0]
      value = pair[1]
      instance_variable_set("@#{name}", value)
    end
  end

  instance_eval do
    attr_reader(*attributes)

    attributes.each do |method_name|
      private method_name
    end
  end
end

#initialize_with_hash(*attributes) ⇒ Object Also known as: initialize_with 



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# File 'lib/smart_init/main.rb', line 14

def initialize_with_hash *attributes
  public_readers_filter = -> (el) {
    el.is_a?(Hash) && el.keys == [:public_readers]
  }
  attributes = attributes.map do |el|
    if el.is_a?(Hash)
      el.map { |k, v| { k => v } }
    else
      el
    end
  end.flatten

  public_readers = attributes.select(&public_readers_filter)
  attributes.delete_if(&public_readers_filter)
  required_attrs = attributes.select { |el| el.is_a?(Symbol) }

  default_value_attrs = attributes.select { |el| el.is_a?(Hash) }.reduce(Hash.new, :merge) || {}

  define_method :initialize do |*parameters|
    parameters = [{}] if parameters == []
    unless parameters.first.is_a?(Hash)
      raise ArgumentError, "invalid input, expected hash of attributes"
    end

    required_attrs.each do |required_attr|
      unless parameters.first.has_key?(required_attr)
        raise ArgumentError, "missing required attribute #{required_attr}"
      end
    end

    (required_attrs + default_value_attrs.keys).each do |attribute|
      value = if parameters.first.has_key?(attribute)
        parameters.first.fetch(attribute)
      else
        default_value_attrs[attribute]
      end

      instance_variable_set("@#{attribute}", value)
    end
  end

  instance_eval do
    all_readers = (required_attrs + default_value_attrs.keys).compact
    attr_reader(*all_readers)

    if public_readers.count == 0
      all_readers.each do |method_name|
        private method_name
      end
    elsif public_readers.first.fetch(:public_readers).is_a?(Array)
      (all_readers - public_readers.first.fetch(:public_readers)).each do |method_name|
        private method_name
      end
    end
  end
end

#is_callable(opts = {}) ⇒ Object 



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# File 'lib/smart_init/main.rb', line 2

def is_callable(opts={})
  method_name = if name_from_opts = opts[:method_name]
    name_from_opts.to_sym
  else
    :call
  end

  define_singleton_method method_name do |*parameters|
    new(*parameters).public_send(method_name)
  end
end