Module:Convert default explained

local getArgs = require('Module:Arguments').getArgslocal TableTools = require('Module:TableTools')local ConvertData = require('Module:Convert/data').all_units

local p =

function p.main(frame) local args = getArgs(frame,)

return p._main(frame, args)end

function resolveUnit(unit) -- Resolves a unit by name to its canonical name. local unitData = ConvertData[unit] if unitData then if unitData["target"] then -- Unit alias return unitData["target"] else -- Not an alias return unit end else -- Not a valid unit return nil endend

function callConvert(frame, args, input, from) local convertArgs = TableTools.shallowClone(args) -- Shift all numbered parameters up by 1. local i = 2 while args[i] ~= nil do convertArgs[i + 1] = args[i] i = i + 1 end -- Set the input value and unit local resolvedFrom = resolveUnit(from) convertArgs[1] = input convertArgs[2] = resolvedFrom -- Wipe custom arguments convertArgs["default-unit"] = nil convertArgs["defaultUnit"] = nil convertArgs["default unit"] = nil convertArgs["default-units"] = nil convertArgs["defaultUnits"] = nil convertArgs["default units"] = nil -- Remove duplicate units in output units (if available) -- Avoid doing this if there are custom display parameters set. if convertArgs[3] ~= nil and convertArgs["disp"]

nil then local outputUnits = mw.text.split(mw.text.trim(convertArgs[3]), "%s") local j = 1 while outputUnits[j] ~= nil do mw.logObject(resolveUnit(outputUnits[j]), resolvedFrom) if resolveUnit(outputUnits[j])

resolvedFrom then -- Duplicate unit. Remove it. table.remove(outputUnits, j) -- Do not increment; the next value will now have an index of `j`. else j = j + 1 end end convertArgs[3] = table.concat(outputUnits, " ") end return frame:expandTemplateend

function p._main(frame, args) if not args[1] then return nil end local rawInput = mw.text.trim(args[1]) local defaultUnit = args["default-unit"] or args["defaultUnit"] or args["default unit"] or args["default-units"] or args["defaultUnits"] or args["default units"] local numSection = mw.ustring.match(rawInput, "^-?[%d,e]+") if numSection

nil then -- Raw output (not a determinable number) return rawInput end if mw.ustring.len(rawInput)

mw.ustring.len(mw.text.trim(numSection)) then -- There only exists a number section. -- Convert, and use the default unit (if defined). if not defaultUnit then return error("No default unit is set, and a unitless input was provided.") else return callConvert(frame, args, numSection, defaultUnit) end else -- There exists a text section. -- Get that section. local textSection = mw.text.trim(string.sub(rawInput, mw.ustring.len(mw.text.trim(numSection)) + 1) ) if resolveUnit(textSection) ~= nil then return callConvert(frame, args, numSection, textSection) else -- Not a unit. Fall back to raw value. return rawInput end endend

return p