Module:Romain
Wikimedia module / De Wikipedia, l'encyclopédie encyclopedia
local p = {}
-- barre horizontale au-dessus des nombres élevés local function overline( s )
return '' .. s .. ''
end
-- Gets the Roman numerals for a given numeral table. Returns both the string of -- numerals and the value of the number after it is finished being processed. local function getLetters( num, t )
local ret = {} for _, v in ipairs( t ) do local val, letter = unpack( v ) while num >= val do num = num - val table.insert( ret, letter ) end end return table.concat( ret ), num
end
function p.toRoman( num, default )
num = tonumber( num ) if not num or num < 1 or num == math.huge then return end num = math.floor( num ) -- Return a message for numbers too big to be expressed in Roman numerals. if num >= 5000000 then return default or 'N/A' end local ret = -- Find the Roman numerals for the large part of numbers 5000 and bigger. -- The if statement is not strictly necessary, but makes the algorithm -- more efficient for smaller numbers. if num >= 5000 then local bigRomans = { { 1000000, 'M' }, { 900000, 'CM' }, { 500000, 'D' }, { 400000, 'CD' }, { 100000, 'C' }, { 90000, 'XC' }, { 50000, 'L' }, { 40000, 'XL' }, { 10000, 'X' }, { 5000, 'V' } } local bigLetters bigLetters, num = getLetters( num, bigRomans ) ret = overline( bigLetters ) end -- Find the Roman numerals for numbers 4999 or less. local smallRomans = { {1000, "M"}, {900, "CM"}, {500, "D"}, {400, "CD"}, {100, "C"}, {90, "XC"}, {50, "L"}, {40, "XL"}, {10, "X"}, {9, "IX"}, {5, "V"}, {4, "IV"}, {1, "I"} } local smallLetters = getLetters( num, smallRomans ) ret = ret .. smallLetters return ret
end
function p.fromRoman( str, default ) local strOrig = str str = str:upper() if not str:find( '^[MDCLXVI]+$' ) then return tonumber( str ) or default or strOrig end local smallRomans = { I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000 } local result = 0 local old, n = 0 for i = str:len(), 1, -1 do n = smallRomans[ str:sub( i, i ) ] if n < old then result = result - n else result = result + n old = n end end return result end
-- compatibility with function p._main(args) return p.toRoman( args[1] ) end
function p.main( frame ) return p.nombreEnRomain( frame ) end
-- functions to call the module from a template (takes the #invoke first arg or the template first arg) function p.nombreEnRomain( frame ) local num if frame == mw.getCurrentFrame() then num = frame.args[1] or frame:getParent().args[1] else num = frame end return p.toRoman( mw.text.trim( num or ) ) end
function p.nombreDepuisRomain( frame ) local str if frame == mw.getCurrentFrame() then str = frame.args[1] or frame:getParent().args[1] else str = frame end return p.fromRoman( mw.text.trim( str or ) ) end
return p