You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: validation.rb
    path of file: ./repos/formeze/lib/formeze
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class Formeze::Validation
  include Formeze::Presence

  def
    
  def validate(form)
    if validates?(form) && field_value?(form) && !field_errors?(form)
      return_value = if @block.arity == 1
        @block.call(form.send(@field.name))
      else
        form.instance_eval(&@block)
      end