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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
parts, sign = normalize
return "PT0S".freeze if parts.empty?
output = 'P'
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
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