Module:Template wrapper/doc explained

This module is to be used in wrapper templates to allow those templates to provide default parameter values and allow editors to pass additional parameters to the underlying working template.

When writing a wrapper template, give this module all of the normally required default parameters necessary to use the wrapper template in its base form. Editors then use the wrapper template as-is or may supply additional wrapper and canonical parameters. Any of the canonical parameters supported by the working template may be added to the wrapper template or supplied by editors in article space. When an editor supplies a parameter that has a default value in the wrapper template, the editor-supplied value overrides the default. When it is necessary to remove a default parameter, editors may set the parameter value to the special keyword unset which will cause this wrapper module to erase the wrapper template's default value for that parameter. This module discards empty named parameters.

Positional parameters are not normally passed on to the working template. Setting will pass all positional parameters to the working template. Positional parameters cannot be excluded; positional parameters may be unset.

Parameters that are used only by the wrapper should be either positional or listed in (a comma-separated list of named parameters). This module will not pass _excluded parameters to the working template.

Usage

<nowiki>{{#invoke:</nowiki>{{BASEPAGENAME}}|wrap|_template={{var|working template}}|_exclude={{var|named parameter}}, {{var|named parameter}}, ...|_reuse={{var|named parameter}}, {{var|named parameter}}, ...|_alias-map={{var|alias parameter}}:{{var|canonical parameter}}|_include-positional=yes|<{{var|default parameter}}>|<{{var|default parameter}}>|...}}

Control parameters

– (required) the name, without namespace, of the working template (the template that is wrapped); see §_template below

– comma-separated list of parameter names used by the wrapper template that are not to be passed to the working template; see §_exclude below

– comma-separated list of canonical names that have meaning to both the wrapper template and to the working template; see §_reuse below

– comma-separated list of wrapper-template parameter names that are to be treated as aliases of specified working template canonical parameters; see §_alias-map below

– pass all positional parameters to the working template; see §_include-positional below

Definitions

canonical parameter – a parameter supported and used by the working template

wrapper parameter – a parameter used by the wrapper template; may provide data for canonical parameters or control other aspects of the wrapper template

alias parameter – a wrapper parameter that is contextually meaningful to the wrapper template but must be renamed to a canonical parameter for use by the working template

reused parameter – a parameter that is shared by both wrapper and working templates and has been modified by wrapper template

default parameter – a canonical parameter given a default value in the wrapper template

wrapper
template !! !!style="border:1px solid black" colspan="11"
Module:Template wrapper !		working template
	→	–––––––→	→	–––––––→	→	–––––––→	→	–––––––→	→	–––––––→	→	filter exclued parameters		working template
	→	–––––––→	→	–––––––→	→	–––––––→	→	–––––––→	→	–––––––→	→
			→	–––––––→	→	–––––––→	→	–––––––→	→	–––––––→	→		→
			→	–––––––→	→	–––––––→	→	–––––––→	→	–––––––→	→
			→	convert alias parameters to canonical parameters	→		→	–––––––→	→	–––––––→	→				→
					→		→	modify reused canonical parameters
	→	–––––––→	→						→		→	–––→	→
			→	–––––––→	→	–––––––→	→
	→	–––––––→	→	–––––––→	→	–––––––→	→
			→	–––––––→	→	–––––––→	→	–––––––→	→	–––––––→	→	–––→	→

Parameter details

_template

The only required parameter, supplies the name, without namespace, of the working template (the template that is wrapped). If this parameter is omitted, Module:Template wrapper will emit the error message:

|_template= missing or empty

_alias-map

takes a comma-separated list of wrapper-template parameters that are to be treated as aliases of specified working template canonical parameters. Each mapping element of the list has the form:

<{{var|from}}>:<{{var|to}}> – where: <{{var|from}}> is a wrapper parameter name and <{{var|to}}> is a canonical parameter nameIn this example, it may be preferable for a wrapper template to use which may be unknown to the working template but the working template may have an equivalent so in the <nowiki>{{#invoke:}}</nowiki> we would write:

Positional parameters may also be mapped to canonical parameters:

Enumerated wrapper parameters may be mapped to enumerated canonical parameters using the # enumerator specifier:

Given the above example, will map to ; also, and will map to

Multiple wrapper parameters can map to a single canonical parameter:

Wrapper parameters listed in are not passed to the working template. Mapping positional parameters when may give undesirable results. and will cause all other positional parameters to be passed to the working template as is: wrapper template <nowiki>{{{2}}}</nowiki> becomes working template <nowiki>{{{2}}}</nowiki>, etc; working template will not get <nowiki>{{{1}}}</nowiki> though it will get .

_reuse

takes a comma-separated list of canonical parameters that have meaning to both the wrapper template and to the working template

In the simplest cases, a canonical parameter passed into the wrapper template overrides a default parameter provided in the wrapper template. Sometimes a wrapper parameter is the same as a canonical parameter and the wrapper template needs to modify the parameter value before it is passed to the working template. In this example, is both a wrapper parameter and a canonical parameter that the wrapper template needs to modify before passing to the working template. To do this we first write:

then, in the wrapper template's <nowiki>{{#invoke:Template wrapper|wrap|_template=...|...}}</nowiki> we write: