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: csv_parser.rb
    path of file: ./repos/ekylibre/lib/active_exchanger
    
    the code of the file until where you have to start completion: module ActiveExchanger
  class CsvParser
    require 'csv'

    attr_reader :config

    def initiali
    
    def validate(value, constraint)
      case constraint
      when :not_nil
        value.present?
      when :greater_or_equal_to_zero
        value.is_a?(Numeric) && value >= 0
      when :greater_to_zero
        value.is_a?(Numeric) && value > 0
      else
        false
      end