#--
#     This file is part of the X12Parser library that provides tools to
#     manipulate X12 messages using Ruby native syntax.
#
#     http://x12parser.rubyforge.org 
#     
#     Copyright (C) 2008 APP Design, Inc.
#
#     This library is free software; you can redistribute it and/or
#     modify it under the terms of the GNU Lesser General Public
#     License as published by the Free Software Foundation; either
#     version 2.1 of the License, or (at your option) any later version.
#
#     This library is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#     Lesser General Public License for more details.
#
#     You should have received a copy of the GNU Lesser General Public
#     License along with this library; if not, write to the Free Software
#     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
#++
#
module X12

  # $Id: Field.rb 35 2008-11-13 18:33:44Z ikk $
  #
  # Class to represent a segment field. Please note, it's not a descendant of Base.

  class Field
    attr_reader :name, :type, :required, :min_length, :max_length, :validation
    attr_writer :content

    # Create a new field with given parameters
    def initialize(name, type, required, min_length, max_length, validation)
      @name       = name       
      @type       = type       
      @required   = required == 'R' ? true : false   
      @min_length = min_length.to_i
      @max_length = max_length.to_i 
      @validation = validation
      @content = nil
    end

    # Returns printable string with field's content
    def inspect
      "Field #{name}|#{type}|#{required}|#{min_length}-#{max_length}|#{validation} <#{@content}>"
    end

    # Synonym for 'render'
    def to_s
      render
    end

    def render
      # FIXME - this is for debug only
      @content || ''
    end # render

    # Check if it's been set yet
    def has_content?
      !@content.nil?
    end

    # Erase the content
    def set_empty!
      @content = nil
    end

#     def to_regexp
#       r = case type
#           when 'I' : "\\d{#{min_length},#{max_length}}"
#           when 'S' : ".{#{min_length},#{max_length}}"
#           when /C.*/ : 'composite'
#           when /"(.*)"/ : $1
#           else ''
#           end # case
#       Regexp.new("#{CONSTANT[:field]}#{r}")
#     end
  end
end