Difference between revisions of "Module:If empty/sandbox"

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blackwiki>Jackmcbarn
(Created page with 'local p = {} function p.main(frame) local args = require('Module:Arguments').getArgs(frame, {wrappers = 'Template:If empty', removeBlanks = false}) -- For ba...')
 
m (2 revisions imported)
 
(One intermediate revision by one other user not shown)
Line 3: Line 3:
 
function p.main(frame)
 
function p.main(frame)
 
local args = require('Module:Arguments').getArgs(frame, {wrappers = 'Template:If empty', removeBlanks = false})
 
local args = require('Module:Arguments').getArgs(frame, {wrappers = 'Template:If empty', removeBlanks = false})
 +
 +
local lastk = 0
 +
for k,v in ipairs(args) do
 +
if v ~= '' then
 +
return v
 +
end
 +
lastk = k
 +
end
  
 
-- For backwards compatibility reasons, the first 8 parameters can be unset instead of being blank,
 
-- For backwards compatibility reasons, the first 8 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.
local lowestNil = math.huge
+
for i = lastk + 1, 9 do
for i = 8,1,-1 do
+
if args[i] and args[i] ~= '' then
if args[i] == nil then
+
-- If any uses of this template depend on the behavior above, add them to a tracking category.
args[i] = ''
+
-- This is a rather fragile, convoluted, hacky way to do it, but it ensures that this module's output won't be modified
lowestNil = i
+
-- by it.
 +
frame:extensionTag('ref', '[[Category:Instances of Template:If_empty missing arguments]]', {group = 'TrackingCategory'})
 +
frame:extensionTag('references', '', {group = 'TrackingCategory'})
 +
 
 +
return args[i]
 
end
 
end
 
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
 
end
  
 
return p
 
return p

Latest revision as of 05:23, 27 September 2020

Documentation for this module may be created at Module:If empty/sandbox/doc

local p = {}

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

	local lastk = 0
	for k,v in ipairs(args) do
		if v ~= '' then
			return v
		end
		lastk = k
	end

	-- For backwards compatibility reasons, the first 8 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.
	for i = lastk + 1, 9 do
		if args[i] and args[i] ~= '' 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'})

			return args[i]
		end
	end

end

return p