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module RruleHumanizer
extend ActiveSupport::Concern
WEEKDAY_NAMES = {
de: { "MO"=>"Montag","TU"=>"Dienstag","WE"=>"Mittwoch","TH"=>"Donnerstag","FR"=>"Freitag","SA"=>"Samstag","SU"=>"Sonntag" },
en: { "MO"=>"Monday","TU"=>"Tuesday","WE"=>"Wednesday","TH"=>"Thursday","FR"=>"Friday","SA"=>"Saturday","SU"=>"Sunday" }
}.freeze
WEEKDAY_NAMES_ADVERBIAL = {
de: { "MO"=>"montags","TU"=>"dienstags","WE"=>"mittwochs","TH"=>"donnerstags","FR"=>"freitags","SA"=>"samstags","SU"=>"sonntags" }
}.freeze
WEEKDAY_NAMES_ABBR = {
de: { "MO"=>"Mo","TU"=>"Di","WE"=>"Mi","TH"=>"Do","FR"=>"Fr","SA"=>"Sa","SU"=>"So" }
}.freeze
ORDINAL_NAMES = {
de: { 1=>"ersten", 2=>"zweiten", 3=>"dritten", 4=>"vierten", 5=>"fünften", -1=>"letzten", -2=>"vorletzten" },
en: { 1=>"first", 2=>"second", 3=>"third", 4=>"fourth", 5=>"fifth", -1=>"last", -2=>"second-to-last" }
}.freeze
MONTH_NAMES = {
de: %w[Januar Februar März April Mai Juni Juli August September Oktober November Dezember],
en: %w[January February March April May June July August September October November December]
}.freeze
def humanize_rrule(locale = I18n.locale)
return nil if rrule.blank?
parts = Hash[rrule.split(";").map { |p| p.split("=", 2) }]
return nil if parts["COUNT"] || parts["UNTIL"] # old one-off data, don't guess
freq, interval, byday, bymonth = parts["FREQ"], parts["INTERVAL"].to_i, parts["BYDAY"], parts["BYMONTH"]
loc = locale.to_sym
weekdays = WEEKDAY_NAMES[loc] || WEEKDAY_NAMES[:en]
ordinals = ORDINAL_NAMES[loc] || ORDINAL_NAMES[:en]
months = MONTH_NAMES[loc] || MONTH_NAMES[:en]
byday_values = byday&.split(",")
days = byday_values&.map do |d|
if d =~ /^(-?\d+)([A-Z]{2})$/
"#{ordinals[$1.to_i]} #{weekdays[$2]}"
else
weekdays[d]
end
end
excluded_monthly_ordinal = nil
excluded_monthly_weekday = nil
selected_monthly_ordinals = nil
selected_monthly_weekday = nil
if freq == "MONTHLY" && byday_values.present?
ordinal_days = byday_values.map { |d| d.match(/^([1-5])([A-Z]{2})$/) }
if ordinal_days.all?
positions = ordinal_days.map { |match| match[1].to_i }.uniq.sort
weekdays_in_rule = ordinal_days.map { |match| match[2] }.uniq
if weekdays_in_rule.size == 1
selected_monthly_ordinals = positions
selected_monthly_weekday = weekdays_in_rule.first
missing_positions = (1..5).to_a - positions
if positions.size == 4 && missing_positions.size == 1
excluded_monthly_ordinal = missing_positions.first
excluded_monthly_weekday = selected_monthly_weekday
end
end
end
end
join_ordinals = lambda do |ordinal_values, conjunction|
names = ordinal_values.map { |ordinal| ordinals[ordinal] }
names.size > 1 ? "#{names[0..-2].join(', ')} #{conjunction} #{names.last}" : names.first
end
base =
case loc
when :de
case freq
when "WEEKLY"
if days
if interval == 2
adverbial = byday.split(",").map { |d| WEEKDAY_NAMES_ADVERBIAL[:de][d] }
"Alle zwei Wochen #{adverbial.join(' und ')}"
else
"Jeden #{days.join(' und ')}"
end
else
interval == 2 ? "Alle zwei Wochen" : "Wöchentlich"
end
when "MONTHLY"
if excluded_monthly_ordinal
"Jeden #{weekdays[excluded_monthly_weekday]} im Monat, außer dem #{ordinals[excluded_monthly_ordinal]} #{weekdays[excluded_monthly_weekday]}"
elsif selected_monthly_ordinals
"Jeden #{join_ordinals.call(selected_monthly_ordinals, 'und')} #{weekdays[selected_monthly_weekday]} im Monat"
else
days ? "Jeden #{days.join(' und ')} im Monat" : "Monatlich"
end
end
else
case freq
when "WEEKLY"
days ? "#{interval == 2 ? 'Every other' : 'Every'} #{days.join(' and ')}" : (interval == 2 ? "Every other week" : "Weekly")
when "MONTHLY"
if excluded_monthly_ordinal
"Every #{weekdays[excluded_monthly_weekday]} of the month, except the #{ordinals[excluded_monthly_ordinal]} #{weekdays[excluded_monthly_weekday]}"
elsif selected_monthly_ordinals
"Every #{join_ordinals.call(selected_monthly_ordinals, 'and')} #{weekdays[selected_monthly_weekday]} of the month"
else
days ? "Every #{days.join(' and ')} of the month" : "Monthly"
end
end
end
return nil unless base
if bymonth
included = bymonth.split(",").map(&:to_i)
missing = ((1..12).to_a - included)
if missing.size == 1
excluded_name = months[missing.first - 1]
base += (loc == :de ? ", außer im #{excluded_name}" : ", except in #{excluded_name}")
end
# more than one missing month: bymonth pattern more complex than we handle, leave base as-is silently
end
base
end
def self.wday_abbr(time, locale)
code = %w[SU MO TU WE TH FR SA][time.wday]
(WEEKDAY_NAMES_ABBR[locale.to_sym] || WEEKDAY_NAMES_ABBR[:de])[code]
end
end
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