Module: MetricFu::Constantize

Included in:
Formatter
Defined in:
lib/metric_fu/constantize.rb

Instance Method Summary collapse

Instance Method Details

#constantize(camel_cased_word) ⇒ Object

Copied from ActiveSupport and modified so as not to introduce a dependency. github.com/rails/rails/blob/master/activesupport/lib/active_support/inflector/methods.rb#L220



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# File 'lib/metric_fu/constantize.rb', line 5

def constantize(camel_cased_word)
  tries ||= 2
  names = camel_cased_word.split("::")
  names.shift if names.empty? || 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 it it's owned
      # directly before we reach Object or the end of ancestors.
      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
rescue NameError
  # May need to attempt to require the file and try again.
  begin
    require underscore(camel_cased_word)
  rescue LoadError => e
    mf_log e.message
  end

  if (tries -= 1).zero?
    raise
  else
    retry
  end
end

#underscore(camel_cased_word) ⇒ Object

Copied from active_support github.com/rails/rails/blob/51cd6bb829c418c5fbf75de1dfbb177233b1b154/activesupport/lib/active_support/inflector/methods.rb#L88



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# File 'lib/metric_fu/constantize.rb', line 47

def underscore(camel_cased_word)
  word = camel_cased_word.to_s.dup
  word.gsub!(/::/, "/")
  word.gsub!(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
  word.gsub!(/([a-z\d])([A-Z])/, '\1_\2')
  word.tr!("-", "_")
  word.downcase!
  word
end