Module:Ancient Olympiads

-- This module implements {{Ancient Olympiads}}. It converts a year in the Gregorian
-- calendar to the equivalent year of the ancient Greek era organized by Olympiads.

local data = mw.loadData( 'Module:Ancient Olympiads/data' )
local lang = mw.language.getContentLanguage()

local p = {}

function p._main( inputYear )
	-- Convert the input to an integer if possible. Return "N/A" if the input could
	-- not be converted, or if the converted input is too big or too small.
	inputYear = tonumber( inputYear )
	if not inputYear or inputYear > tonumber( lang:formatDate( 'Y' ) ) then
		return "''N/A''"
	end

	-- Find the length of the data.
	-- We need the length of the data so that we can loop through it backwards.
	-- Normally we can get the length of tables with the # operator, but this
	-- doesn't work with mw.loadData, as mw.loadData uses a metatable, and the
	-- # operator doesn't work for tables that use metatables.
	local dataLength = 0
	for i, t in ipairs( data ) do
		dataLength = i
	end

	-- Find the year in the data page and display the output.
	for i = dataLength, 1, -1 do
		local t = data[i]
		if inputYear >= t.year then
			return string.format(
				'%s, held in %d and won by %s.',
				t.numberOl, t.year, t.winner
			)
		end
	end

	-- Our input year was less than the year of the first Olympiad.
	return string.format(
		'%d was before the [[776 BC|1st]] [[Olympiad]].',
		inputYear
	)
end

		--I don't know how the debug console works. I'm testing this from Editing Module:Year in other calendars, now without the second function

return p