lib/voodoo/symbol_tracker.rb

   1 require 'set'
   2
   3 module Voodoo
   4   # Class to keep track of defined and used symbols.
   5   class SymbolTracker
   6     def initialize
   7       @defined = Set.new
   8       @used = Set.new
   9     end
  10
  11     def define *symbols
  12       @defined.merge symbols
  13     end
  14
  15     def use *symbols
  16       @used.merge symbols
  17     end
  18
  19     def defined_but_unused_symbols
  20       @defined - @used
  21     end
  22
  23     def defined_symbols
  24       @defined
  25     end
  26
  27     def used_symbols
  28       @used
  29     end
  30
  31     def used_but_undefined_symbols
  32       @used - @defined
  33     end
  34   end
  35 end