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For example PG refers to https://www.ietf.org/rfc/rfc3339.txt when converting(Ref: https://www.postgresql.org/docs/current/datatype-datetime.html) According to the ref there is no explicit mention of allowing sign before the parts, which reads as below: Durations: dur-second = 1*DIGIT "S" dur-minute = 1*DIGIT "M" [dur-second] dur-hour = 1*DIGIT "H" [dur-minute] dur-time = "T" (dur-hour / dur-minute / dur-second) dur-day = 1*DIGIT "D" dur-week = 1*DIGIT "W" dur-month = 1*DIGIT "M" [dur-day] dur-year = 1*DIGIT "Y" [dur-month] dur-date = (dur-day / dur-month / dur-year) [dur-time] duration = "P" (dur-date / dur-time / dur-week) We should not attempt to move sign forward in this case.
59 lines
2 KiB
Ruby
59 lines
2 KiB
Ruby
# frozen_string_literal: true
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require "active_support/core_ext/object/blank"
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module ActiveSupport
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class Duration
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# Serializes duration to string according to ISO 8601 Duration format.
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class ISO8601Serializer # :nodoc:
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DATE_COMPONENTS = %i(years months days)
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def initialize(duration, precision: nil)
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@duration = duration
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@precision = precision
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end
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# Builds and returns output string.
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def serialize
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parts = normalize
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return "PT0S" if parts.empty?
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output = +"P"
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output << "#{parts[:years]}Y" if parts.key?(:years)
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output << "#{parts[:months]}M" if parts.key?(:months)
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output << "#{parts[:days]}D" if parts.key?(:days)
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output << "#{parts[:weeks]}W" if parts.key?(:weeks)
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time = +""
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time << "#{parts[:hours]}H" if parts.key?(:hours)
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time << "#{parts[:minutes]}M" if parts.key?(:minutes)
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if parts.key?(:seconds)
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time << "#{sprintf(@precision ? "%0.0#{@precision}f" : '%g', parts[:seconds])}S"
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end
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output << "T#{time}" unless time.empty?
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output
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end
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private
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# Return pair of duration's parts and whole duration sign.
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# Parts are summarized (as they can become repetitive due to addition, etc).
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# Zero parts are removed as not significant.
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# If all parts are negative it will negate all of them and return minus as a sign.
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def normalize
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parts = @duration.parts.each_with_object(Hash.new(0)) do |(k, v), p|
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p[k] += v unless v.zero?
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end
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# Convert weeks to days and remove weeks if mixed with date parts
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if week_mixed_with_date?(parts)
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parts[:days] += parts.delete(:weeks) * SECONDS_PER_WEEK / SECONDS_PER_DAY
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end
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parts
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end
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def week_mixed_with_date?(parts)
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parts.key?(:weeks) && (parts.keys & DATE_COMPONENTS).any?
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end
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end
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end
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end
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