Difference between revisions of "Module:If empty"

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blackwiki>Jackmcbarn
(add comment)
blackwiki>Jackmcbarn
(add a tracking category to any pages that use this behavior)
Line 6: Line 6:
 
-- For backwards compatibility reasons, the first 9 parameters can be unset instead of being blank,
 
-- For backwards compatibility reasons, the first 9 parameters can be unset instead of being blank,
 
-- even though there's really no legitimate use case for this. At some point, this will be removed.
 
-- even though there's really no legitimate use case for this. At some point, this will be removed.
for i = 1,9 do
+
local lowestNil = math.huge
 +
for i = 9,1,-1 do
 
if args[i] == nil then
 
if args[i] == nil then
 
args[i] = ''
 
args[i] = ''
 +
lowestNil = i
 
end
 
end
 
end
 
end
  
for _,v in ipairs(args) do
+
for k,v in ipairs(args) do
 
if v ~= '' then
 
if v ~= '' then
 +
if lowestNil < k then
 +
-- If any uses of this template depend on the behavior above, add them to a tracking category.
 +
-- This is a rather fragile, convoluted, hacky way to do it, but it ensures that this module's output won't be modified
 +
-- by it.
 +
frame:extensionTag('ref', '[[Category:Instances of Template:If_empty missing arguments]]', {group = 'TrackingCategory'})
 +
frame:extensionTag('references', '', {group = 'TrackingCategory'})
 +
end
 
return v
 
return v
 
end
 
end

Revision as of 21:37, 23 December 2014

This module supports Template:If empty.

Tracking/maintenance category


local p = {}

function p.main(frame)
	local args = require('Module:Arguments').getArgs(frame, {wrappers = 'Template:If empty', removeBlanks = false})

	-- For backwards compatibility reasons, the first 9 parameters can be unset instead of being blank,
	-- even though there's really no legitimate use case for this. At some point, this will be removed.
	local lowestNil = math.huge
	for i = 9,1,-1 do
		if args[i] == nil then
			args[i] = ''
			lowestNil = i
		end
	end

	for k,v in ipairs(args) do
		if v ~= '' then
			if lowestNil < k then
				-- If any uses of this template depend on the behavior above, add them to a tracking category.
				-- This is a rather fragile, convoluted, hacky way to do it, but it ensures that this module's output won't be modified
				-- by it.
				frame:extensionTag('ref', '[[Category:Instances of Template:If_empty missing arguments]]', {group = 'TrackingCategory'})
				frame:extensionTag('references', '', {group = 'TrackingCategory'})
			end
			return v
		end
	end
end

return p