模組:Pn
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