diff options
Diffstat (limited to 'activesupport/lib/active_support/duration/iso8601_serializer.rb')
-rw-r--r-- | activesupport/lib/active_support/duration/iso8601_serializer.rb | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/duration/iso8601_serializer.rb b/activesupport/lib/active_support/duration/iso8601_serializer.rb new file mode 100644 index 0000000000..05c6a083a9 --- /dev/null +++ b/activesupport/lib/active_support/duration/iso8601_serializer.rb @@ -0,0 +1,51 @@ +require 'active_support/core_ext/object/blank' +require 'active_support/core_ext/hash/transform_values' + +module ActiveSupport + class Duration + # Serializes duration to string according to ISO 8601 Duration format. + class ISO8601Serializer + def initialize(duration, precision: nil) + @duration = duration + @precision = precision + end + + # Builds and returns output string. + def serialize + output = 'P' + parts, sign = normalize + output << "#{parts[:years]}Y" if parts.key?(:years) + output << "#{parts[:months]}M" if parts.key?(:months) + output << "#{parts[:weeks]}W" if parts.key?(:weeks) + output << "#{parts[:days]}D" if parts.key?(:days) + time = '' + time << "#{parts[:hours]}H" if parts.key?(:hours) + time << "#{parts[:minutes]}M" if parts.key?(:minutes) + if parts.key?(:seconds) + time << "#{sprintf(@precision ? "%0.0#{@precision}f" : '%g', parts[:seconds])}S" + end + output << "T#{time}" if time.present? + "#{sign}#{output}" + end + + private + + # Return pair of duration's parts and whole duration sign. + # Parts are summarized (as they can become repetitive due to addition, etc). + # Zero parts are removed as not significant. + # If all parts are negative it will negate all of them and return minus as a sign. + def normalize + parts = @duration.parts.each_with_object(Hash.new(0)) do |(k,v),p| + p[k] += v unless v.zero? + end + # If all parts are negative - let's make a negative duration + sign = '' + if parts.values.all? { |v| v < 0 } + sign = '-' + parts.transform_values!(&:-@) + end + [parts, sign] + end + end + end +end |