postal/lib/postal/query_string.rb

module Postal
  class QueryString

    def initialize(string)
      @string = string.strip + " "
    end

    def [](value)
      to_hash[value.to_s]
    end

    def empty?
      to_hash.empty?
    end

    def to_hash
      @hash ||= @string.scan(/([a-z]+)\:\s*(?:(\d{2,4}\-\d{2}-\d{2}\s\d{2}\:\d{2})|\"(.*?)\"|(.*?))(\s|\z)/).each_with_object({}) do |(key, date, string_with_spaces, value), hash|
        if date
          actual_value = date
        elsif string_with_spaces
          actual_value = string_with_spaces
        elsif value == "[blank]"
          actual_value = nil
        else
          actual_value = value
        end

        if hash.keys.include?(key.to_s)
          hash[key.to_s] = [hash[key.to_s]].flatten
          hash[key.to_s] << actual_value
        else
          hash[key.to_s] = actual_value
        end
      end
    end

  end
end