Method: Twig::Extension::Core.constant

Defined in:

lib/twig/extension/core.rb

.constant(constant, object = nil, defined_test: false) ⇒ Object

Parameters:

• constant (String)
• object (Object, nil) (defaults to: nil)
• defined_test (Boolean) (defaults to: false)

# File 'lib/twig/extension/core.rb', line 327

def self.constant(constant, object = nil, defined_test: false)
  unless object.nil?
    if defined_test
      return object.class.const_defined?(constant)
    end

    return object.class.const_get(constant)
  end

  if constant.include?('::')
    class_name, _, constant = constant.rpartition('::')
  else
    class_name = Kernel.name
  end

  unless Object.const_defined?(class_name)
    return false if defined_test

    raise Error::Runtime, "Class #{class_name} does not exist."
  end

  klass = Object.const_get(class_name)

  unless klass.const_defined?(constant)
    return false if defined_test

    raise Error::Runtime, "Class #{class_name} does not have a constant #{constant}."
  end

  return true if defined_test

  klass.const_get(constant)
end