PostgreSQL HStore Parser & Dumper

hstore.rb

module HStore
  class << self
    def parse(str)
      hash = Hash[*str.to_s.split(',').map do |item|
        if item.strip =~ /\A\"(.*)\"[ ]*=>[ ]*(.*)\z/
          key = $1.to_sym
          value = $2 =~ /\"(.*)\"/ ? $1 : nil
          [key, value]
        else
          raise ArgumentError, 'invalid format'
        end
      end.flatten]
      hash = hash.with_indifferent_access if hash.respond_to? :with_indifferent_access
      hash
    end

    def dump(hash)
      raise ArgumentError, 'invalid format' unless hash.is_a? Hash
      hash.map do |key, value|
        value = value.nil? ? "NULL" : "\"#{value}\""
        "\"#{key}\"=>#{value}"
      end.join(',')
    end
  end
end