Module:Pn

From OODA WIKI

The module returns one value from its list of unnamed parameters.

The named parameter |idx= is the index of the parameter that is to be returned.

Negative indices count backward from the end of the list.

A wrapper template may be used to simplify usage.

Examples

  • {{#invoke:Pn |getVal | idx=1}}
  • {{#invoke:Pn |getVal | idx= | a | b | c | d | e | f }} → a
  • {{#invoke:Pn |getVal | idx=0 | a | b | c | d | e | f }}
  • {{#invoke:Pn |getVal | idx=1 | a | b | c | d | e | f }} → a
  • {{#invoke:Pn |getVal | idx=2 | a | b | c | d | e | f }} → b
  • {{#invoke:Pn |getVal | idx=-1 | a | b | c | d | e | f }} → f
  • {{#invoke:Pn |getVal | idx=99 | a | b | c | d | e | f }}

Using a wrapper template, {{P-1}}:

  • {{p-1 | a | b | c | d | e | f }} → f
  • {{wdib|ps=1|P8011|qid=Q84055514}}
  • {{wdib|ps=1|P8011|qid=Q84055514|list=p-1}}

--[[
Module that returns one value from a list of unnamed parameters
Named parameter idx is the index of the parameter that is to be returned
Negative indices count backward from the end of the list
==]]

local p = {}

p.getVal = function(frame)
	local args = {}
	-- copy arguments from frame object and its parent
	for k, v in pairs(frame.args) do
		args[k] = v
	end
	for k, v in pairs(frame:getParent().args) do
		args[k] = v
	end
	if not args[1] then
		return nil
	end
	local idx = tonumber(args.idx) or 1
	if idx < 0 then idx = #args + idx + 1 end
	return args[idx]
end

return p