code_ruby/Maasha/biopieces.rb

   1 class BioPieces
   2         RECORD_DELIMITER = "\n---\n"
   3
   4         class Record
   5                 attr_reader :__hash__
   6
   7                 def initialize( data )
   8                         @__hash__ = data
   9                 end
  10
  11                 def method_missing( name, *args, &block )
  12                         if args.empty? && @__hash__.has_key?( name ) then
  13                                 @__hash__[ name ]
  14                         else
  15                                 super # get the original exception
  16                         end
  17                 end
  18
  19                 def to_s
  20                         @__hash__.map { | key, value | "#{ key }: #{ value }" }.join( "\n" ) + RECORD_DELIMITER
  21                 end
  22
  23                 def to_hash
  24                         @__hash__.dup
  25                 end
  26         end
  27
  28         def self.file( path )
  29                 bp = new( File.open( path ) )
  30                 yield bp if block_given?
  31                 bp
  32         ensure
  33                 # if no block was given, the user wants the BioPieces instance
  34                 # with a still open File so he can read it, so only close if a block
  35                 # had been given.
  36                 bp.close if block_given?
  37         end
  38
  39         def initialize( stream )
  40                 @stream = stream
  41         end
  42
  43         def close
  44                 @stream.close if @stream.respond_to? :close
  45         end
  46
  47         def record_get
  48                 return unless block = @stream.gets( RECORD_DELIMITER )
  49
  50                 block.chomp!( RECORD_DELIMITER )
  51                 data = Hash[ *block.split( /: |\n/, 2 ) ]
  52                 Record.new( data )
  53         end
  54
  55         def each
  56                 yield record_get until @stream.eof?
  57                 self # not to have a messy return value
  58         end
  59 end
  60
  61
  62 __END__