Module:BaseConvert
Jump to navigation
Jump to search
Documentation for this module may be created at Module:BaseConvert/doc
local p = {}
local digits = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
local function normalizeFullWidthChars(s)
return mw.ustring.gsub(s, '[！-～]', function(s)
return mw.ustring.char(mw.ustring.codepoint(s, 1) - 0xFEE0)
end)
end
local function _convert(n, base, from, precision, width, default, prefix, suffix)
n = tostring(n)
-- 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
local fracPart = table.concat(tf, '')
-- remove trailing zeros if not needed
if not precision then
fracPart = fracPart:gsub('0*$', '')
end
-- add the radix point if needed
if #fracPart > 0 then
fracPart = '.' .. fracPart
end
return (prefix or '') .. sign .. intPart .. fracPart .. (suffix or '')
end
function p.convert(frame)
-- Allow for invocation via #invoke or directly from another module
local args
if frame == mw.getCurrentFrame() then
args = frame.args
else
args = frame
end
local n = args.n
local base = args.base
local from = args.from
local precision = args.precision
local width = args.width
local default = args.default
local prefix = args.prefix
local suffix = args.suffix
return _convert(n, base, from, precision, width, default, prefix, suffix)
end
setmetatable(p, {
__index = function(t, k)
local from, base = k:match('^([0-9]+)to([0-9]+)$')
if not from then return nil end
return function(frame)
local args = frame.args
return _convert(mw.text.trim(args[1]), base, from, args.precision, args.width,
args.default, args.prefix, args.suffix)
end
end
})
return p