Module: EndpointFlux::ClassLoader

Defined in:
lib/endpoint_flux/class_loader.rb

Class Method Summary collapse

Class Method Details

.constantize(camel_cased_word) ⇒ Object 



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# File 'lib/endpoint_flux/class_loader.rb', line 27

def constantize(camel_cased_word)
  names = camel_cased_word.split("::".freeze)

  # Trigger a built-in NameError exception including the ill-formed constant in the message.
  Object.const_get(camel_cased_word) if names.empty?

  # Remove the first blank element in case of '::ClassName' notation.
  names.shift if names.size > 1 && names.first.empty?

  names.inject(Object) do |constant, name|
    if constant == Object
      constant.const_get(name)
    else
      candidate = constant.const_get(name)
      next candidate if constant.const_defined?(name, false)
      next candidate unless Object.const_defined?(name)

      # Go down the ancestors to check if it is owned directly. The check
      # stops when we reach Object or the end of ancestors tree.
      constant = constant.ancestors.inject(constant) do |const, ancestor|
        break const    if ancestor == Object
        break ancestor if ancestor.const_defined?(name, false)
        const
      end

      # owner is in Object, so raise
      constant.const_get(name, false)
    end
  end
end

.load_class(klass_name) ⇒ Object 



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# File 'lib/endpoint_flux/class_loader.rb', line 5

def load_class(klass_name)
  return klass_name if klass_name.is_a?(Class)

  constantize "::#{string_to_class_name(klass_name.to_s)}"
rescue NameError
  nil
end

.load_class!(klass_name) ⇒ Object 



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# File 'lib/endpoint_flux/class_loader.rb', line 13

def load_class!(klass_name)
  load_class(klass_name) ||
    raise("The [#{klass_name}] should be a string representing a class")
end

.string_to_class_name(klass_name) ⇒ Object 



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# File 'lib/endpoint_flux/class_loader.rb', line 18

def string_to_class_name(klass_name)
  klass_name
    .sub(%r{^[a-z\d]*}) { $&.capitalize }
    .gsub(%r{(?:_|(\/))([a-z\d]*)}) do
      "#{Regexp.last_match[1]}#{Regexp.last_match[2].capitalize}"
    end
    .gsub('/', '::')
end