Module:CallAssert

local function pack(...) return {...}, select('#', ...) end

local function mapArray(func, array, count) local result = {} for i = 1, count or #array do result[i] = func(array[i]) end return result end

local function quote(value) if type(value) == 'string' then return (string.gsub(string.format('%q', value), '\\\n', '\\n')) -- Outer parentheses remove second value returned by gsub end local str = tostring(value) if type(value) == 'table' and str ~= 'table' then return '{' .. str .. '}' end return str end

local function callAssert(func, funcName, ...) local result, resultCount = pack(func(...)) if not result[1] then local args, argsCount = pack(...) args = mapArray(quote, args, argsCount) local message = mw.ustring.format( '%s(%s) failed', funcName, table.concat(args, ', ') ) error(message, 2) end return unpack(result, 1, resultCount) end

return callAssert