Difference between revisions of "Module:Unsubst"

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m (fix whitespace removal; remove empty parameters after handling aliases and prevent removal of two or fewer consecutive empty parameters in a sequence)
m (1 revision imported)
Line 1: Line 1:
−
local checkType = require('libraryUtil').checkType
 
−
 
 
local p = {}
 
local p = {}
−
 
−
local BODY_PARAM = '$B'
 
  
 
local specialParams = {
 
local specialParams = {
−
['$params'] = 'parameter list',
+
['$N'] = 'template name', -- Deprecated, but keeping until it is removed from transcluding templates
−
['$aliases'] = 'parameter aliases',
+
['$B'] = 'template content',
−
['$flags'] = 'flags',
 
−
['$B'] = 'template content'
 
 
}
 
}
  
−
function p.main(frame, body)
+
p[''] = function ( frame )
−
-- If we are substing, this function returns a template invocation, and if
+
if not frame:getParent() then
−
-- not, it returns the template body. The template body can be specified in
+
error( '{{#invoke:Unsubst|}} makes no sense without a parent frame' )
−
-- the body parameter, or in the template parameter defined in the
 
−
-- BODY_PARAM variable. This function can be called from Lua or from
 
−
-- #invoke.
 
−
 
 
−
-- Return the template body if we aren't substing.
 
−
if not mw.isSubsting() then
 
−
if body ~= nil then
 
−
return body
 
−
elseif frame.args[BODY_PARAM] ~= nil then
 
−
return frame.args[BODY_PARAM]
 
−
else
 
−
error(string.format(
 
−
"no template content specified (use parameter '%s' from #invoke)",
 
−
BODY_PARAM
 
−
), 2)
 
−
end
 
 
end
 
end
−
 
+
if not frame.args['$B'] then
−
-- Sanity check for the frame object.
+
error( '{{#invoke:Unsubst|}} requires parameter $B (template content)' )
−
if type(frame) ~= 'table'
 
−
or type(frame.getParent) ~= 'function'
 
−
or not frame:getParent()
 
−
then
 
−
error(
 
−
"argument #1 to 'main' must be a frame object with a parent " ..
 
−
"frame available",
 
−
2
 
−
)
 
 
end
 
end
−
 
+
−
-- Find the invocation name.
+
if mw.isSubsting() then
−
local mTemplateInvocation = require('Module:Template invocation')
+
---- substing
−
local name = mTemplateInvocation.name(frame:getParent():getTitle())
+
-- Combine passed args with passed defaults
−
 
+
local args = {}
−
-- Combine passed args with passed defaults
 
−
local args = {}
 
−
if string.find( ','..(frame.args['$flags'] or '')..',', ',%s*override%s*,' ) then
 
−
for k, v in pairs( frame:getParent().args ) do
 
−
args[k] = v
 
−
end
 
−
for k, v in pairs( frame.args ) do
 
−
if not specialParams[k] then
 
−
if v == '__DATE__' then
 
−
v = mw.getContentLanguage():formatDate( 'F Y' )
 
−
end
 
−
args[k] = v
 
−
end
 
−
end
 
−
else
 
 
for k, v in pairs( frame.args ) do
 
for k, v in pairs( frame.args ) do
 
if not specialParams[k] then
 
if not specialParams[k] then
Line 75: Line 29:
 
args[k] = v
 
args[k] = v
 
end
 
end
−
end
 
  
−
-- Trim parameters, if not specified otherwise
+
-- Build an equivalent template invocation
−
if not string.find( ','..(frame.args['$flags'] or '')..',', ',%s*keep%-whitespace%s*,' ) then
+
-- First, find the title to use
−
for k, v in pairs( args ) do args[k] = mw.ustring.match(v, '^%s*(.*)%s*$') or '' end
+
local titleobj = mw.title.new(frame:getParent():getTitle())
−
end
+
local title
−
 
+
if titleobj.namespace == 10 then -- NS_TEMPLATE
−
-- Pull information from parameter aliases
+
title = titleobj.text
−
local aliases = {}
+
elseif titleobj.namespace == 0 then -- NS_MAIN
−
if frame.args['$aliases'] then
+
title = ':' .. titleobj.text
−
local list = mw.text.split( frame.args['$aliases'], '%s*,%s*' )
+
else
−
for k, v in ipairs( list ) do
+
title = titleobj.prefixedText
−
local tmp = mw.text.split( v, '%s*>%s*' )
 
−
aliases[tonumber(mw.ustring.match(tmp[1], '^[1-9][0-9]*$')) or tmp[1]] = ((tonumber(mw.ustring.match(tmp[2], '^[1-9][0-9]*$'))) or tmp[2])
 
−
end
 
−
end
 
−
for k, v in pairs( aliases ) do
 
−
if args[k] and ( not args[v] or args[v] == '' ) then
 
−
args[v] = args[k]
 
 
end
 
end
−
args[k] = nil
 
−
end
 
  
−
-- Remove empty parameters, if specified
+
-- Build the invocation body with numbered args first, then named
−
if string.find( ','..(frame.args['$flags'] or '')..',', ',%s*remove%-empty%s*,' ) then
+
local ret = '{{' .. title
−
local tmp = 0
 
 
for k, v in ipairs( args ) do
 
for k, v in ipairs( args ) do
−
if v ~= '' or ( args[k+1] and args[k+1] ~= '' ) or ( args[k+2] and args[k+2] ~= '' ) then
+
if string.find( v, '=', 1, true ) then
−
tmp = k
+
-- likely something like 1=foo=bar, we need to do it as a named arg
−
else
 
 
break
 
break
 
end
 
end
 +
ret = ret .. '|' .. v
 +
args[k] = nil
 
end
 
end
 
for k, v in pairs( args ) do
 
for k, v in pairs( args ) do
−
if v == '' then
+
ret = ret .. '|' .. k .. '=' .. v
−
if not (type(k) == 'number' and k < tmp) then args[k] = nil end
 
−
end
 
 
end
 
end
 +
 +
return ret .. '}}'
 +
else
 +
---- Not substing
 +
-- Just return the "body"
 +
return frame.args['$B'] .. (frame.args['$N'] and frame:getParent():getTitle() == mw.title.getCurrentTitle().prefixedText and '[[Category:Calls to Module:Unsubst that use $N]]' or '')
 
end
 
end
−
 
−
-- Order parameters
 
−
if frame.args['$params'] then
 
−
local params, tmp = mw.text.split( frame.args['$params'], '%s*,%s*' ), {}
 
−
for k, v in ipairs(params) do
 
−
v = tonumber(mw.ustring.match(v, '^[1-9][0-9]*$')) or v
 
−
if args[v] then tmp[v], args[v] = args[v], nil end
 
−
end
 
−
for k, v in pairs(args) do tmp[k], args[k] = args[k], nil end
 
−
args = tmp
 
−
end
 
−
 
−
return mTemplateInvocation.invocation(name, args)
 
 
end
 
end
−
 
−
p[''] = p.main -- For backwards compatibility
 
  
 
return p
 
return p

Revision as of 17:10, 31 January 2018


Helper module to facilitate a substituted template transform into a template transclusion.

Maintenance templates, such as {{Citation needed}} or {{Refimprove}}, should never be substituted. A trick to avoid that is to make a template substitute to its transcluded form.

Usage

To turn a template into a self-substituting template, wrap the existing template code with: 

{{ {{{|safesubst:}}}#invoke:Unsubst||$B=

 [ ... existing template code ... ]

}}

The wikitext to display when not substed must be given as "$B". A parameter "$N" may also be seen in some templates; this was required in an older version of the module, but is no longer necessary and may be removed. Such templates are automatically placed in Category:Calls to Module:Unsubst that use $N.

All other parameters passed to the #invoke will be copied to the generated template invocation as default values. If the value of any of these default parameters is "__DATE__", that value in the generated template invocation will be the current month and year.

Some templates have a <noinclude> but no matching </noinclude> at the end of the template. In such cases the missing </noinclude> must be added before the ending }}.

Example

Consider a template Template:Example containing the following code: 

{{ {{{|safesubst:}}}#invoke:Unsubst||foo=bar |date=__DATE__ |$B=

 [ ... Template code goes here ... ]

}}
Original Result
{{subst:example}} {{Example|foo=bar|date=December 2024}}
{{subst:example|foo=X}} {{Example|foo=X|date=December 2024}}
{{subst:example|baz=X}} {{Example|foo=bar|baz=X|date=December 2024}}
{{subst:example|date=January 2001}} {{Example|foo=bar|date=January 2001}} 
local p = {}

local specialParams = {
	['$N'] = 'template name', -- Deprecated, but keeping until it is removed from transcluding templates
	['$B'] = 'template content',
}

p[''] = function ( frame )
	if not frame:getParent() then
		error( '{{#invoke:Unsubst|}} makes no sense without a parent frame' )
	end
	if not frame.args['$B'] then
		error( '{{#invoke:Unsubst|}} requires parameter $B (template content)' )
	end
	
	if mw.isSubsting() then
		---- substing
		-- Combine passed args with passed defaults
		local args = {}
		for k, v in pairs( frame.args ) do
			if not specialParams[k] then
				if v == '__DATE__' then
					v = mw.getContentLanguage():formatDate( 'F Y' )
				end
				args[k] = v
			end
		end
		for k, v in pairs( frame:getParent().args ) do
			args[k] = v
		end

		-- Build an equivalent template invocation
		-- First, find the title to use
		local titleobj = mw.title.new(frame:getParent():getTitle())
		local title
		if titleobj.namespace == 10 then -- NS_TEMPLATE
			title = titleobj.text
		elseif titleobj.namespace == 0 then -- NS_MAIN
			title = ':' .. titleobj.text
		else
			title = titleobj.prefixedText
		end

		-- Build the invocation body with numbered args first, then named
		local ret = '{{' .. title
		for k, v in ipairs( args ) do
			if string.find( v, '=', 1, true ) then
				-- likely something like 1=foo=bar, we need to do it as a named arg
				break
			end
			ret = ret .. '|' .. v
			args[k] = nil
		end
		for k, v in pairs( args ) do
			ret = ret .. '|' .. k .. '=' .. v
		end
		
		return ret .. '}}'
	else
		---- Not substing
		-- Just return the "body"
		return frame.args['$B'] .. (frame.args['$N'] and frame:getParent():getTitle() == mw.title.getCurrentTitle().prefixedText and '[[Category:Calls to Module:Unsubst that use $N]]' or '')
	end
end

return p
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