From: Peter Vanderhaden <bostonantifan@...>
Date: 2007-11-17T17:58:12+09:00
Subject: void value expression

I'm a Ruby & OO newbie, so please bear with me.  I wrote a Ruby script
that works, but it is written in a "procedural" way as opposed to OO.
I'm now trying to convert it to OO principles, but am having a tough
time.  I'm getting the following error when I run the program.  Can
anyone give me an idea of what might be the problem?  (I know that some
methods only contain placeholder comments, but I don't think that should
be the cause of the problem.)  Any help is really appreciated!

  1 #!/usr/bin/ruby
  2 class Record
  3     def initialize (record_string)
  4         @record = record_string
  5     end
  6
  7     def fix_volume_label
  8         # TODO: apply processing to @record to fix volume label
  9         # if required for this record
 10     end
 11
 12     def fix_extension_case
 13        # TODO: apply processing to @record to fix volume file
extension
 14        # case if required for this record
 15     end
 16
 17     def to_str
 18         @record
 19     end
 20
 21 end
 22
 23 class FixOpt
 24     def initialize
 25
 26         @argv = $*
 27         @header_regex = /BegBates,Volume,Path/
 28         @in_file = nil
 29         @out_file = nil
 30
 31         unless arguments_valid? @argv
 32             usage
 33             exit -1
 34         end
 35
 36         begin
 37             @in_file.open argv[0]
 38         rescue IOError
 39             @in_file.close
 40             puts "error opening input file, terminating"
 41             exit -1
 42         end
 43
 44     end
 45
 46     def run
 47         begin
 48             @in_file.each |record_line|
 49                 next if record_line =~ @header_regex
 50                 record = Record.new(line)
 51                 record.fix_volume_label
 52                 record.fix_extension_case
 53                 puts record #same as puts record.to_str
 54             end
 55         rescue IOError
 56             @in_file.close
 57             puts "error reading from input file, terminating"
 58             exit -1
 59         end
 60         @in_file.close
 61         exit 0
 62     end
 63
 64     :private
 65
 66     def arguments_valid? (argv)
 67         # validate argv[0] is a file and we have permission to open
 68     end
 69
 70     def usage
 71         # print usage
 72     end
 73
 74 #end
 75
 76 fix_opt = FixOpt.new
 77 fix_opt.run
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