# File lib/rake.rb, line 289
289:     def initialize(names, values, parent=nil)
290:       @names = names
291:       @parent = parent
292:       @hash = {}
293:       names.each_with_index { |name, i|
294:         @hash[name.to_sym] = values[i]
295:       }
296:     end

     # File lib/rake.rb, line 306
306:     def [](index)
307:       lookup(index.to_sym)
308:     end

     # File lib/rake.rb, line 310
310:     def each(&block)
311:       @hash.each(&block)
312:     end

     # File lib/rake.rb, line 326
326:     def inspect
327:       to_s
328:     end

     # File lib/rake.rb, line 314
314:     def method_missing(sym, *args, &block)
315:       lookup(sym.to_sym)
316:     end

     # File lib/rake.rb, line 300
300:     def new_scope(names)
301:       values = names.collect { |n| self[n] }
302:       self.class.new(names, values, self)
303:     end

     # File lib/rake.rb, line 318
318:     def to_hash
319:       @hash
320:     end

     # File lib/rake.rb, line 322
322:     def to_s
323:       @hash.inspect
324:     end

     # File lib/rake.rb, line 332
332:     def lookup(name)
333:       if @hash.has_key?(name)
334:         @hash[name]
335:       elsif ENV.has_key?(name.to_s)
336:         ENV[name.to_s]
337:       elsif ENV.has_key?(name.to_s.upcase)
338:         ENV[name.to_s.upcase]
339:       elsif @parent
340:         @parent.lookup(name)
341:       end
342:     end