module ElasticAPM::Util::Inflector

def self.constantize(camel_cased_word)

unknown.
NameError is raised when the name is not in CamelCase or the constant is

end
'C'.constantize # => 'outside', same as ::C
C # => 'inside'
C = 'inside'
module M
C = 'outside'

account:
whether it starts with "::" or not. No lexical context is taken into
The name is assumed to be the one of a top-level constant, no matter

'Test::Unit'.constantize # => Test::Unit
'Module'.constantize # => Module

Tries to find a constant with the name specified in the argument string.

From https://github.com/rails/rails/blob/861b70e92f4a1fc0e465ffcf2ee62680519c8f6f/activesupport/lib/active_support/inflector/methods.rb#L249
rubocop:disable all 
def self.constantize(camel_cased_word)
  names = camel_cased_word.split('::')
  # 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 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