Diff ^(Module)

     # File libraries/diff/diff.rb, line 266
266:   def self.calculate_ratio(matches, length)
267:     return 1.0 if length.zero?
268:     2.0 * matches / length
269:   end

     # File libraries/diff/diff.rb, line 300
300:   def self.count_leading(line, ch)
301:     i, n = 0, line.length
302:     while i < n and line[i].chr == ch
303:       i += 1
304:     end
305:     i
306:   end

     # File libraries/diff/diff.rb, line 272
272:   def self.get_close_matches(word, possibilities, n=3, cutoff=0.6)
273:     unless n > 0
274:       raise "n must be > 0: #{n}"
275:     end
276:     unless 0.0 <= cutoff and cutoff <= 1.0
277:       raise "cutoff must be in (0.0..1.0): #{cutoff}"
278:     end
279: 
280:     result = []
281:     s = SequenceMatcher.new
282:     s.set_seq_b word
283:     possibilities.each do |x|
284:       s.set_seq_a x
285:       if s.real_quick_ratio >= cutoff and
286:           s.quick_ratio >= cutoff and
287:           s.ratio >= cutoff
288:         result.push [s.ratio, x]
289:       end
290:     end
291:     
292:     unless result.nil? or result.empty?
293:       result.sort
294:       result.reverse!
295:       result = result[-n..-1]
296:     end
297:     result.collect { |score, x| x }
298:   end