Formula:Si in pagina basilari/doc

Haec est subpagina documentationis de "Formula:Si in pagina basilari".

Haec subpagina informationes categoriasque et alias res continet quae in pagina principali respectiva non continentur.

Hanc paginam, in spatio Formulae nominali, oportet Latine convertere.

This is the {{Si in pagina basilari}} meta-template. It helps other templates detect if they are on a basepage (i.e. a page whose name matches the pattern "x:x") subpage ("x:x/x") or subsubpage ("x:x/x/x").

An alternative way to detect whether a page is a subpage is to combine the parser functions #ifeq: and #titleparts. See Alternatives for simpler text below.

De usu

{{Si in pagina basilari |result if on a basepage (|result if on a subpage) (|result if on a subsubpage) (|page=pagename)}}

For example, {{Si in pagina basilari |Basepage|Subpage}} on the page "User:Example" would return: Basepage
whilst on "User:Example/page" (or "User:Example/page/page", "User:Example/page/page/page", etc.) it would return: Subpage

On a subsubpage such as "User:Example/page/page" (or "User:Example/page/page/page", etc.), {{Si in pagina basilari |Basepage|Subpage|Subsubpage}} would return: Subsubpage

Use an empty parameter to specify no action for a particular type of page. {{Si in pagina basilari |Basepage||Subsubpage}} on "User:Example/page", for example, would return nothing, but would return "Subsubpage" if on "User:Example/page/page", "User:Example/page/page/page", etc. (and "Basepage" if on "User:Example").

Handling equals-signs ("=")

Use numbered parameters if their values include equals-signs ("="), i.e.

{{Si in pagina basilari |1=basepage result (|2=subpage result) (|3=subsubpage result)}}

page parameter

The page parameter is included for testing/demonstration. For example:

{{Si in pagina basilari |(basepage result)|(subpage result)|page=User:Example/test}}

Regardless of where the above is placed, it will return: (subpage result)
(because "User:Example/test" is a subpage). The page doesn't have to exist.

If page is left empty (|page=) or undefined, the page where the template is transcluded (i.e. {{PAGENAME}}) is used.

page also accepts variables, e.g. {{Si in pagina basilari |(basepage result)|(subpage result)|page={{{page|}}} }}

Technical note

This template detects subpages in all namespaces, including those without the MediaWiki subpage feature enabled.

Alternatives for simpler text

A subpage can be detected without using another template, by instead using the title-splitting parser function #titleparts with #ifeq:

{{#ifeq:{{#titleparts:{{PAGENAME}}|1|1}}|{{PAGENAME}}
 | [...code if on a basepage...]
 | [...code if on a subpage...]
}}

For example, many templates can check if the page is a /sandbox version, by the similar markup with #ifeq and #titleparts:

{{#ifeq: {{#titleparts:{{PAGENAME}}|1|1}} | {{PAGENAME}}

| {{documentation}}

| {{template sandbox notice}}

}}

That simple logic works because Template:Template sandbox notice also checks the page name for "/sandbox" before displaying the sandbox notice; otherwise, any other subpage would show no extra text. By avoiding a template, and using a single #ifeq, then the processing uses only +2 expansion depth levels, rather than +7 levels, and avoids "wp:exceeded template limits" inside a complex /doc page.

Vide quoque

{{In harenario aut alibi}} — Distinguishes between the /sandbox subpages and the root template page and other subpages.
{{In periclitationibus aut alibi}} — Distinguishes between the /testcases subpages and the root template page and other subpages.
{{In formula aut alibi}} — Distinguishes between pages in the template namespace and other namespaces.
{{Si in pagina basilari}} — Distinguishes between the root template page and subpages, without special consideration in the mainspace.
{{Si in prospectu}} — Distinguishes between the previewed page and the saved page
{{In subpagina aut alibi}} — Distinguisheds between the root page and subpages (any subpage), classifying pagenames in the mainspace with a slash as being the root page.