Another update from ingydotnet^djgoku

Task/Text-processing-1/Ruby/text-processing-1-2.rb

@@ -0,0 +1,32 @@
+Reading = Struct.new(:date, :value, :flag)
+
+DailyReading = Struct.new(:date, :readings) do
+  def good() readings.select(&:flag) end
+  def bad() readings.reject(&:flag) end
+  def sum() good.map(&:value).inject(0.0) {|sum, val| sum + val } end
+  def avg() good.size > 0 ? (sum / good.size) : 0 end
+  def print_status
+    puts "%11s:  good: %2d  bad: %2d  total: %8.3f  avg: %6.3f" % [date, good.count, bad.count, sum, avg]
+    self
+  end
+end
+
+daily_readings = IO.foreach(ARGV.first).map do |line|
+  (date, *parts) = line.chomp.split(/\s/)
+  readings = parts.each_slice(2).map {|pair| Reading.new(date, pair.first.to_f, pair.last.to_i > 0)}
+  DailyReading.new(date, readings).print_status
+end
+
+all_readings = daily_readings.flat_map(&:readings)
+good_readings = all_readings.select(&:flag)
+all_streaks = all_readings.slice_when {|bef, aft| bef.flag != aft.flag }
+worst_streak = all_streaks.reject {|grp| grp.any?(&:flag)}.sort_by(&:size).last
+
+total = good_readings.map(&:value).reduce(:+)
+num_readings = good_readings.count
+puts
+puts "Total: %.3f" % total
+puts "Readings: #{num_readings}"
+puts "Average  %.3f" % total./(num_readings)
+puts
+puts "Max run of #{worst_streak.count} consecutive false readings from #{worst_streak.first.date} until #{worst_streak.last.date}"