Difference between revisions of "Module:Unsubst"

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

Revision as of 09:01, 7 June 2017


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=November 2024}}
{{subst:example|foo=X}} {{Example|foo=X|date=November 2024}}
{{subst:example|baz=X}} {{Example|foo=bar|baz=X|date=November 2024}}
{{subst:example|date=January 2001}} {{Example|foo=bar|date=January 2001}} 
local checkType = require('libraryUtil').checkType

local p = {}

local BODY_PARAM = '$B'

local specialParams = {
	['$params'] = 'parameter list',
	['$aliases'] = 'parameter aliases',
	['$flags'] = 'flags',
	['$B'] = 'template content'
}

function p.main(frame, body)
	-- If we are substing, this function returns a template invocation, and if
	-- not, it returns the template body. The template body can be specified in
	-- 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

	-- Sanity check for the frame object.
	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

	-- Find the invocation name.
	local mTemplateInvocation = require('Module:Template invocation')
	local name = mTemplateInvocation.name(frame:getParent():getTitle())

	-- 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
			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
	end

	-- Trim parameters, if not specified otherwise
	if not string.find( ','..(frame.args['$flags'] or '')..',', ',%s*keep%-whitespace%s*,' ) then
		for k, v in pairs( args ) do args[k] = mw.ustring.match(v, '^%s*(.*)%s*$') or '' end
	end

	-- Pull information from parameter aliases
	local aliases = {}
	if frame.args['$aliases'] then
		local list = mw.text.split( frame.args['$aliases'], '%s*,%s*' )
		for k, v in ipairs( list ) do
			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
		args[k] = nil
	end

	-- Remove empty parameters, if specified
	if string.find( ','..(frame.args['$flags'] or '')..',', ',%s*remove%-empty%s*,' ) then
		local tmp = 0
		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
				tmp = k
			else
				break
			end
		end
		for k, v in pairs( args ) do
			if v == '' then
				if not (type(k) == 'number' and k < tmp) then args[k] = nil end
			end
		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

p[''] = p.main -- For backwards compatibility

return p
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