Drop down list of code in HTML

Sunday, 28 February 2010 23:22
// Using an XML file to define options OptParseSimple


class OptParseSimple



  def initialize(filename, args)

    doc = Document.new(File.open('options.xml','r').read)

    @options = XPath.match(doc.root, 'records/option[switch!=""]')



    switches = @options.map do |option| 

      switch = option.text('switch')

      switch[0] == '-' ? switch : nil

    end



    switches.compact!



    # split the argument switches if grouped e.g. -ltr

    args.map! do |arg|



      if arg[/^\-[a-zA-Z]+$/] and switches.grep(/#{arg}/).empty? then

        arg[1..-1].scan(/./).map {|x| '-' + x} 

      else

        arg

      end

    end



    args.flatten!



    a1 = options_match(@options[0], args).flatten.each_slice(2).map {|x| x if x[0]}.compact

    options_remaining = XPath.match(doc.root, 'records/option[switch=""]/name/text()')

    a2 = args.zip(options_remaining).map(&:reverse)

    if a2.map(&:first).all? then

      @h = Hash[*(a1+a2).map{|x,y| [x.to_s.to_sym, y]}.flatten]

    else

      invalid_option = a2.detect {|x,y| x.nil? }.last

      raise "invalid option: %s not recognised" % invalid_option

    end

  end



  def to_h()

    @h

  end



  private



  def options_match(option, args)



    switch, switch_alias = option.text('switch'), option.text('alias')

    switch_pattern = switch_alias ? "(%s|%s)" % [switch, switch_alias] : switch 

    switch_matched, arg_index = args.each_with_index.detect {|x,j| x[/^#{switch_pattern}/]}

    key, value = nil



    if switch_matched then



      value_pattern = option.text('value')



      if value_pattern then



        # check for equal sign

        value = switch_matched[/\=(#{value_pattern})/,1]



        # check the next arg

        if value.nil? and args.length > 0 then



          next_arg = args[arg_index + 1] 



          # check to make sure it's not the next switch

          next_option = @options[1] if @options.length > 1



          if next_arg != next_option then

            # validate using the regex

            value = next_arg[/#{value_pattern}/]



            if value then

              args.delete_at(arg_index + 1)

            else

              raise option.text('errors/records/error[last()]')

            end

          end



        else

          args.delete_at(arg_index)

        end      



      else

        args.delete_at(arg_index)

      end



      key = option.text('name')

 

    elsif option.text('mandatory').downcase == 'true' then



      raise option.text('errors/records/error')



    end



    pair = [key, value]

    @options.shift

    next_pair = options_match(@options[0], args) if @options.length > 0



    [pair, next_pair]

  end



end