Module:Ancient Egypt era

-- This module implements Template:Ancient Egypt era. It converts a year in the Gregorian -- calendar to the equivalent year of the ancient Egyptian era organized by dynasties and kings.

local data = mw.loadData( 'Module:Ancient Egypt era/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 - 1 >= t.dynstart and inputYear - 1 <= t.dynend then -- year of the dynasty, test with = p._main( -495 ) -- The input year in the calendar is one after the expected (-775 for the year 776 BC). This is why all values need to be corrected by 1. return string.format( '%s dynasty, %d', t.dynlink, t.dynasty, inputYear - t.dynstart ) end end end

function p.main( frame ) -- If you only want to run this module from another Lua module, you can get -- rid of this function entirely. This function is only used if you want to -- run this individual module from a template. local args = require( 'Module:Arguments' ).getArgs( frame, { parentOnly = true } ) return p._main( args[ 1 ] ) end

return p