local Time = {}
--Internal functions
--[[
Validate a time defintion
@param table definition data
@return boolean
]]--
function validate( definition )
--Validate constantes
if not Time.knowsPrecision( definition.precision ) or ( definition.calendar ~= Time.CALENDAR.GREGORIAN and definition.calendar ~= Time.CALENDAR.JULIAN ) then
return false
end
--Validate year
if not (type( definition.year ) == 'number' or (definition.year == nil and precision == Time.PRECISION.DAY)) then
return false
end
if definition.precision <= Time.PRECISION.YEAR then
return true
end
--Validate month
if not validateNumberInRange( definition.month, 1, 12 ) then
return false
end
if definition.precision <= Time.PRECISION.MONTH then
return true
end
--Validate day
if not validateNumberInRange( definition.day, 1, 31 ) then
return false
end
if definition.precision <= Time.PRECISION.DAY then
return true
end
--Validate hour
if not validateNumberInRange( definition.hour, 0, 23 ) then
return false
end
if definition.precision <= Time.PRECISION.HOUR then
return true
end
--Validate minute
if not validateNumberInRange( definition.minute, 0, 59 ) then
return false
end
if definition.precision <= Time.PRECISION.MINUTE then
return true
end
--Validate second
if not validateNumberInRange( definition.second, 0, 60 ) then
return false
end
return true
end
--[[
Check if a value is a number in the given range
@param mixed value
@param number min
@param number max
@return boolean
]]--
function validateNumberInRange( value, min, max )
return type( value ) == 'number' and value >= min and value <= max
end
--[[
Try to find the relevant precision for a time definition
@param table time definition
@return number the precision
]]--
function guessPrecision( definition )
if definition.month == nil then
return Time.PRECISION.YEAR
elseif definition.day == nil then
return Time.PRECISION.MONTH
elseif definition.hour == nil then
return Time.PRECISION.DAY
elseif definition.minute == nil then
return Time.PRECISION.HOUR
elseif definition.second == nil then
return Time.PRECISION.MINUTE
else
return Time.PRECISION.SECOND
end
end
--[[
Try to find the relevant calendar for a time definition
@param table time definition
@return string the calendar name
]]--
function guessCalendar( definition )
if definition.year ~= nil and definition.year < 1583 and definition.precision > Time.PRECISION.MONTH then
return Time.CALENDAR.JULIAN
else
return Time.CALENDAR.GREGORIAN
end
end
--[[
Parse an ISO 2061 string and return it as a time definition
@param string iso the iso datetime
@param boolean withoutRecurrence concider date in the format XX-XX as year-month and not month-day
@return table
]]--
function parseIso8601( iso, withoutRecurrence )
local definition = {}
--Split date and time
iso = mw.text.trim( iso:upper() )
local beginMatch, endMatch, date, time, offset = iso:find( '([%+%-]?[%d%-]+)[T ]?([%d%.:]*)([Z%+%-]?[%d:]*)' )
if beginMatch ~= 1 or endMatch ~= iso:len() then --iso is not a valid ISO string
return {}
end
--date
if date ~= nil then
local isBC = false
if date:sub( 1, 1 ) == '-' then
isBC = true
date = date:sub( 2, date:len() )
end
local parts = mw.text.split( date, '-' )
if not withoutRecurrence and table.maxn( parts ) == 2 and parts[1]:len() == 2 then
--MM-DD case
definition.month = tonumber( parts[1] )
definition.day = tonumber( parts[2] )
else
if isBC then
definition.year = -1 * tonumber( parts[1] ) - 1 --Years BC are counted since 0 and not -1
else
definition.year = tonumber( parts[1] )
end
definition.month = tonumber( parts[2] )
definition.day = tonumber( parts[3] )
end
end
--time
if time ~= nil then
local parts = mw.text.split( time, ':' )
definition.hour = tonumber( parts[1] )
definition.minute = tonumber( parts[2] )
definition.second = tonumber( parts[3] )
end
--ofset
if offset ~= nil then
if offset == 'Z' then
definition.utcoffset = '+00:00'
else
definition.utcoffset = offset
end
end
return definition
end
--[[
Format UTC offset for ISO output
@param string offset UTC offset
@return string UTC offset for ISO
]]--
function formatUtcOffsetForIso( offset )
if offset == '+00:00' then
return 'Z'
else
return offset
end
end
--[[
Prepend as mutch as needed the character c to the string str in order to to have a string of length length
@param mixed str
@param string c
@param number length
@return string
]]--
function prepend(str, c, length)
str = tostring( str )
while str:len() < length do
str = c .. str
end
return str
end
--Public interface
--[[
Build a new Time
@param table definition definition of the time
@return Time|nil
]]--
function Time.new( definition )
--Default values
if definition.precision == nil then
definition.precision = guessPrecision( definition )
end
if definition.calendar == nil then
definition.calendar = guessCalendar( definition )
end
if not validate( definition ) then
return nil
end
local time = {
year = definition.year or nil,
month = definition.month or 1,
day = definition.day or 1,
hour = definition.hour or 0,
minute = definition.minute or 0,
second = definition.second or 0,
utcoffset = definition.utcoffset or '+00:00',
calendar = definition.calendar or Time.CALENDAR.GREGORIAN,
precision = definition.precision or 0
}
setmetatable( time, {
__index = Time,
__tostring = function( self ) return self:toString() end
} )
return time
end
--[[
Build a new Time from an ISO 8061 datetime
@param string iso the time as ISO string
@param boolean withoutRecurrence concider date in the format XX-XX as year-month and not month-day
@return Time|nil
]]--
function Time.newFromIso8061( iso, withoutRecurrence )
return Time.new( parseIso8601( iso, withoutRecurrence ) )
end
--[[
Build a new Time from a Wikidata time value
@param table wikidataValue the time as represented by Wikidata
@return Time|nil
]]--
function Time.newFromWikidataValue( wikidataValue )
local definition = parseIso8601( wikidataValue.time )
definition.precision = wikidataValue.precision
if wikidataValue.calendarmodel == 'http://www.wikidata.org/entity/Q1985727' then
definition.calendar = Time.CALENDAR.GREGORIAN
elseif wikidataValue.calendarmodel == 'http://www.wikidata.org/entity/Q1985786' then
definition.calendar = Time.CALENDAR.JULIAN
else
return nil
end
return Time.new( definition )
end
--[[
Return a Time as a ISO 8061 string
@return string
]]--
function Time:toIso8061()
local iso = ''
if self.year ~= nil then
if self.year < 0 then
--Years BC are counted since 0 and not -1
iso = '-' .. prepend( -1 * self.year - 1, '0', 4 )
else
iso = prepend( self.year, '0', 4 )
end
end
--month
if self.precision < Time.PRECISION.MONTH then
return iso
end
if self.iso ~= '' then
iso = iso .. '-'
end
iso = iso .. prepend( self.month, '0', 2 )
--day
if self.precision < Time.PRECISION.DAY then
return iso
end
iso = iso .. '-' .. prepend( self.day, '0', 2 )
--hour
if self.precision < Time.PRECISION.HOUR then
return iso
end
iso = iso .. 'T' .. prepend( self.hour, '0', 2 )
--minute
if self.precision < Time.PRECISION.MINUTE then
return iso .. formatUtcOffsetForIso( self.utcoffset )
end
iso = iso .. ':' .. prepend( self.minute, '0', 2 )
--second
if self.precision < Time.PRECISION.SECOND then
return iso .. formatUtcOffsetForIso( self.utcoffset )
end
return iso .. ':' .. prepend( self.second, '0', 2 ) .. formatUtcOffsetForIso( self.utcoffset )
end
--[[
Return a Time as a string
@param mw.language|string|nil language to use. By default the content language.
@return string
]]--
function Time:toString( language )
if language == nil then
language = mw.language.getContentLanguage()
elseif type( language ) == 'string' then
language = mw.language.new( language )
end
--return language:formatDate( 'r', self:toIso8061() )
return self:toIso8061()
--TODO: improve
end
--[[
Return a Time in HTMl (with a <time> node)
@param mw.language|string|nil language to use. By default the content language.
@param table|nil attributes table of attributes to add to the <time> node.
@return string
]]--
function Time:toHtml( language, attributes )
if attributes == nil then
attributes = {}
end
attributes['datetime'] = self:toIso8061()
return self:toString( language ) -- return mw.text.tag( 'time', attributes, self:toString( language ) )
end
--[[
All possible precisions for a Time (same ids as Wikibase)
]]--
Time.PRECISION = {
GY = 0, --Gigayear
MY100 = 1, --100 Megayears
MY10 = 2, --10 Megayears
MY = 3, --Megayear
KY100 = 4, --100 Kiloyears
KY10 = 5, --10 Kiloyears
KY = 6, --Kiloyear
YEAR100 = 7, --100 years
YEAR10 = 8, --10 years
YEAR = 9,
MONTH = 10,
DAY = 11,
HOUR = 12,
MINUTE = 13,
SECOND = 14
}
--[[
Check if the precision is known
@param number precision ID
@return boolean
]]--
function Time.knowsPrecision( precision )
for _,id in pairs( Time.PRECISION ) do
if id == precision then
return true
end
end
return false
end
--[[
Supported calendar models
]]--
Time.CALENDAR = {
GREGORIAN = 'Gregorian',
JULIAN = 'Julian'
}
return Time
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