Module:Unsubst
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 | This Lua module is used on approximately 13,600,000 pages, or roughly 22% of all pages. To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them. |
 | This module is rated as ready for general use. It has reached a mature form and is thought to be relatively bug-free and ready for use wherever appropriate. It is ready to mention on help pages and other Wikipedia resources as an option for new users to learn. To reduce server load and bad output, it should be improved by sandbox testing rather than repeated trial-and-error editing. |
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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. This module implements that trick.
Infoboxes should use Module:Unsubst-infobox, as should any other templates with parameters listed in block format by default.
Usage
To turn a template into a self-substituting template, wrap the existing template code with:
{{SAFESUBST:<noinclude />#invoke:Unsubst||$B= [ ... existing template code ... ] }} The wikitext to display when not substed must be given as "$B". 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 }}.
Advanced
{{SAFESUBST:<noinclude />#invoke:Unsubst||$params=[ parameters ]|$aliases=[ aliases ]|$flags=[ flags ]|$B= [ ... existing template code ... ] }} Due to Lua limitations, parameters are normally ordered randomly when the template is substituted. |$params= can be used in #invoke:Unsubst to list template parameters in order, comma-separated (e.g. egg,bacon,sausage,cheese,spam). Numbered parameters should be before others in the list. Any remaining parameters are tacked onto the end of the generated invocation.
Parameter aliases can be listed in |$aliases= (and shouldn't be listed in |$params=), and will be replaced automatically. Each alias and its replacement should be formatted as alias>replacement, and each of those pairs should be comma-separated (e.g. œuf>egg,melt>cheese). Note that this parameter can function with or without |$params=.
Parameter |$flags= can be used to modify other facets of the module's behaviour; entries are comma-separated. Valid flags are override (allows parameters in the #invoke: to take precedence over parameters in the original template invocation); keep-whitespace (prevents whitespace from being trimmed from unnamed parameters); and remove-empty (removes empty parameters).
These parameters can be manipulated using parser functions to provide more complicated options (note that in the parameters any parser function, or template or module invocation, should also have SAFESUBST:<noinclude />).
Parameter |$template-name= will override the subst'd template's name with the template name assigned to this parameter.
Example
Consider a template Template:Example containing the following code:
{{SAFESUBST:<noinclude />#invoke:Unsubst||foo=bar |date=__DATE__ |$B= [ ... Template code goes here ... ] }} | Original | Result |
|---|---|
{{subst:example}} | {{Example|date=April 2025|foo=bar}} |
{{subst:example|foo=X}} | {{Example|date=April 2025|foo=X}} |
{{subst:example|baz=X}} | {{Example|baz=X|date=April 2025|foo=bar}} |
{{subst:example|date=January 2001}} | {{Example|date=January 2001|foo=bar}} |
localcheckType=require('libraryUtil').checkTypelocalp={}localBODY_PARAM='$B'localspecialParams={['$params']='parameter list',['$aliases']='parameter aliases',['$flags']='flags',['$B']='template content',['$template-name']='template invocation name override',}functionp.main(frame,body)-- If we are substing, this function returns a template invocation, and if-- not, it returns the template body. The template body can be specified in-- the body parameter, or in the template parameter defined in the-- BODY_PARAM variable. This function can be called from Lua or from-- #invoke.-- Return the template body if we aren't substing.ifnotmw.isSubsting()thenifbody~=nilthenreturnbodyelseifframe.args[BODY_PARAM]~=nilthenreturnframe.args[BODY_PARAM]elseerror(string.format("no template content specified (use parameter '%s' from #invoke)",BODY_PARAM),2)endend-- Sanity check for the frame object.iftype(frame)~='table'ortype(frame.getParent)~='function'ornotframe:getParent()thenerror("argument #1 to 'main' must be a frame object with a parent ".."frame available",2)end-- Find the invocation name.localmTemplateInvocation=require('Module:Template invocation')localnameifframe.args['$template-name']and''~=frame.args['$template-name']thenname=frame.args['$template-name']-- override whatever the template name is with this nameelsename=mTemplateInvocation.name(frame:getParent():getTitle())end-- Combine passed args with passed defaultslocalargs={}ifstring.find(','..(frame.args['$flags']or'')..',',',%s*override%s*,')thenfork,vinpairs(frame:getParent().args)doargs[k]=vendfork,vinpairs(frame.args)doifnotspecialParams[k]thenifv=='__DATE__'thenv=mw.getContentLanguage():formatDate('F Y')endargs[k]=vendendelsefork,vinpairs(frame.args)doifnotspecialParams[k]thenifv=='__DATE__'thenv=mw.getContentLanguage():formatDate('F Y')endargs[k]=vendendfork,vinpairs(frame:getParent().args)doargs[k]=vendend-- Trim parameters, if not specified otherwiseifnotstring.find(','..(frame.args['$flags']or'')..',',',%s*keep%-whitespace%s*,')thenfork,vinpairs(args)doargs[k]=mw.ustring.match(v,'^%s*(.*)%s*$')or''endend-- Pull information from parameter aliaseslocalaliases={}ifframe.args['$aliases']thenlocallist=mw.text.split(frame.args['$aliases'],'%s*,%s*')fork,vinipairs(list)dolocaltmp=mw.text.split(v,'%s*>%s*')aliases[tonumber(mw.ustring.match(tmp[1],'^[1-9][0-9]*$'))ortmp[1]]=((tonumber(mw.ustring.match(tmp[2],'^[1-9][0-9]*$')))ortmp[2])endendfork,vinpairs(aliases)doifargs[k]and(notargs[v]orargs[v]=='')thenargs[v]=args[k]endargs[k]=nilend-- Remove empty parameters, if specifiedifstring.find(','..(frame.args['$flags']or'')..',',',%s*remove%-empty%s*,')thenlocaltmp=0fork,vinipairs(args)doifv~=''or(args[k+1]andargs[k+1]~='')or(args[k+2]andargs[k+2]~='')thentmp=kelsebreakendendfork,vinpairs(args)doifv==''thenifnot(type(k)=='number'andk<tmp)thenargs[k]=nilendendendend-- Order parametersifframe.args['$params']thenlocalparams,tmp=mw.text.split(frame.args['$params'],'%s*,%s*'),{}fork,vinipairs(params)dov=tonumber(mw.ustring.match(v,'^[1-9][0-9]*$'))orvifargs[v]thentmp[v],args[v]=args[v],nilendendfork,vinpairs(args)dotmp[k],args[k]=args[k],nilendargs=tmpendreturnmTemplateInvocation.invocation(name,args)endp['']=p.main-- For backwards compatibilityreturnp