Module:Base convert

local p = {}

local digits = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'

function normalizeFullWidthChars(s) return mw.ustring.gsub(s, '[！-～]', function(s) return mw.ustring.char(mw.ustring.codepoint(s, 1) - 0xFEE0) end) end

function p._convert(n, base, from, precision, width, default, prefix, suffix) n = .. n -- convert to a string

n = n:gsub(' ',) -- kill whitespace

-- strip off any leading '0x' (unless x is a valid digit in the input base) from = tonumber(from)

if not from or from < 34 then local c n, c = n:gsub('^(-?)0[Xx]', '%1') if c > 0 and not from then from = 16 end end

-- check for a negative sign. Do this while the input is still in string form, -- because tonumber doesn't support negative numbers in non-10 bases. local sign = local c n, c = n:gsub('^-', ) if c > 0 then sign = '-' end

-- replace any full-width Unicode characters in the string with their ASCII equivalents n = normalizeFullWidthChars(n)

-- handle scientific notation with whitespace around the 'e' e.g. '5 e7' n = n:gsub('%s*[eE]%s*', 'e')

from = from or 10 local num = tonumber(n, from) base = tonumber(base) precision = tonumber(precision) width = tonumber(width)

if not num or not base then return default or n end

local i, f = math.modf(num)

local t = {} repeat local d = (i % base) + 1 i = math.floor(i / base) table.insert(t, 1, digits:sub(d, d)) until i == 0 while #t < (width or 0) do table.insert(t, 1, '0') end local intPart = table.concat(t, )

-- compute the fractional part local tf = {} while f > 0 and #tf < (precision or 10) do f = f * base i, f = math.modf(f) table.insert(tf, digits:sub(i + 1, i + 1)) end

-- add trailing zeros if needed if precision and #tf < precision then for i = 1, precision - #tf do table.insert(tf, '0') end end

fracPart = table.concat(tf, )

-- remove trailing zeros if not needed if not precision then fracPart = fracPart:gsub('0*$', ) end

-- add the radix point if needed if #fracPart > 0 then fracPart = '.' .. fracPart end

return (prefix or ) .. sign .. intPart .. fracPart .. (suffix or ) end

function p.convert(frame) -- Allow for invocation via #invoke or directly from another module local args if frame == mw.getCurrentFrame() then args = frame.args else args = frame end

local n = args[1] local base = args[2] local from = args[3] return p._convert(n, base, from) end

return p