Module:Loops

-- This module implements.

local getArgs = require('Module:Arguments').getArgs local yesno = require('Module:Yesno') local makeTemplate = require('Module:Template invocation').invocation p = {}

function p.main(frame) local args = getArgs(frame, {		trim = false,		removeBlanks = false	}) return p._main(args) end

function p._main(args) local template = args['call'] or 'void' local calltemplates = yesno(args.substall or "", true) or not mw.isSubsting local variableParam = args.pv	variableParam = tonumber(variableParam) or variableParam or 1 -- fix for positional parameters local variableValPrefix = args.prefix or '' local variableValPostfix = args.postfix or '' local sep = args[1] or '' local constantArgs = p.getConstants(args) local variableVals = p.getVariableVals(args)

local result = '' local addSeparator = false; for i, v in ipairs(variableVals) do		v = mw.text.trim(v) -- trim whitespace if #v > 0 or not yesno(args.skipBlanks) then if addSeparator then result = result .. sep end addSeparator = true; local targs = constantArgs targs[variableParam] = variableValPrefix .. v .. variableValPostfix if calltemplates then local output = p.callTemplate(template, targs) if #mw.text.trim(output) == 0 then addSeparator = false end result = result .. output else result = result .. makeTemplate(template, targs) end end end return result end

function p.getConstants(args) local constantArgNums = p.getArgNums(args, 'pc', 'n') local constantArgs = {} for _, num in ipairs(constantArgNums) do local keyArg = 'pc' .. tostring(num) .. 'n' local valArg = 'pc' .. tostring(num) .. 'v'		local key = args[keyArg] key = tonumber(key) or key local value = args[valArg] constantArgs[key] = value end return constantArgs end

function p.getVariableVals(args) local variableVals = {} if args.start or args.stop or args.by then if args[2] then error("Both start/stop/by and numbered parameters specified") end start = tonumber(args.start or 1) stop = tonumber(args.stop or 1) by = tonumber(args.by or 1) for i = start, stop, by do 			variableVals [#variableVals + 1] = i		end else for i, v in ipairs(args) do			if i ~= 1 then variableVals[i - 1] = v			end end end return variableVals end

function p.getArgNums(args, prefix, suffix) -- Returns a table containing the numbers of the arguments that exist -- for the specified prefix and suffix. local nums = {} local pattern = '^' .. prefix .. '([1-9]%d*)' .. suffix .. '$'	for k, v in pairs(args) do		local num = tostring(k):match(pattern) if num then nums[#nums + 1] = tonumber(num) end end table.sort(nums) return nums end

function p.callTemplate(template, targs) return mw.getCurrentFrame:expandTemplate{title = template, args = targs} end

return p