module EndpointFlux::ClassLoader

Public Instance Methods

constantize(camel_cased_word) click to toggle source
# 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) click to toggle source
# 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) click to toggle source
# 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) click to toggle source
# 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