Wikipedia:Lua/Modul/WLink/en

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WLink – Module with functions for strings in context of wikilinks and external links (URL).

Functions for templates

Most functions expect exactly one unnamed parameter (which should be provided to get a meaningful answer). Whitespace ahead and after content is ignored. HTML Entities would not disturb syntax and might be resolved. The parameter might contain single or double bracketed links which would be extracted if appropriate.

The return value is an empty string (“nothing”), if the parameter value does not fulfil the expectations. If there is a result or the query condition is true, at least one visible character will be returned. The result does not begin or end with a space.

ansiPercent

Convert string by ANSI encoding rather than UTF-8 encoding

Required for some 20^th century servers

Optional parameter space – encoding of spaces:

• space=+ – common for query components
• space=_ – as for Wikis
• Default: %20

formatURL

Create bracketed link, if not yet, from URL or domain

• [http://example.org/about Homepage] yields [http://example.org/about Homepage]
• http://example.org/about yields [http://example.org/about example.org/about]
• example.org yields [http://example.org/ example.org]

getArticleBase

Retrieve generic page title, no fragment nor brackets

Use current page title, if omitted.

getBaseTitle

Retrieve last segment in subpage, no fragment

getEscapedTitle

Retrieve link title with visible square brackets and pipe [|] and enable source line breaks, but avoid <nowiki> for other wikisyntax.

getExtension

Retrieve media extension

Result is downcased (without leading dot).

getFile

Retrieve media page identifier

getFragment

Retrieve original (not decoded) fragment string after #

getLanguage

Retrieve language identifier

getLinktextProblem

Which problem has this presumable link text?

] → square brackets; \n → line break; <wiki> → illegal HTML or wikisyntax elements (block); ISBN PMID RFC

getNamespace

Retrieve namespace number

getNamespaced

Retrieve page name in namespace

Two mandatory parameters:

1. Any kind of namespace specification
2. Page title or prefixed page name or link to page

getPlain

Retrieve text with all links replaced by link titles

getProject

Retrieve project identifier within wikifarm (recommendable brief notation)

getTalkPage

Retrieve talk page, if permitted, or a talk page itself

getTarget

Retrieve first target (wikilink or URL)

getTargetPage

Retrieve first target page (page name or URL of page)

Same as getTarget if no fragment.

getTitle

Retrieve first link title (wikilink or URL), or wikilink target

getWeblink

Retrieve bracketed link from resource URL

getWikilink

Retrieve robust normalized internal link (in brackets)

1. Page name or text with internal link
2. Different link text (optional)

isBracketedLink

Does attempt match a bracketed link?

isBracketedURL

Does attempt match a bracketed URL?

isCategorization

Does attempt match a categorization?

isExternalLink

Does attempt match an external link?

isInterlanguage

Does attempt match an interlanguage link?

isInterwiki

Does attempt match an interwiki link?

isMedia

Does attempt match a media translusion?

isTalkPage

Does attempt match a talk page?

isTitledLink

Does attempt match a titled link?

isValidLink

Does attempt match a link?

isValidLinktext

Is attempt permitted as link text, does not contain other links or other structures?

isWeblink

Does attempt match an external link?

isWikilink

Does attempt match a wikilink?

pageLink

Make robust link on a wiki page, not beginning with *;:#.

failsafe

Version ID (local): 2022-05-09

Optional parameter:

• 1 – Minimum version or wikidata or ~

{{#invoke:WLink|failsafe}} yields 2022-05-09

With a parameter as ISO date it is compared whether the current module satisfies this version or later.

• {{#invoke:WLink|failsafe|2001-01-01}} returns: »2022-05-09«
• {{#invoke:WLink|failsafe|2099-01-01}} returns: »« – (empty), if minimal version condition not matched
• If keyword is wikidata, result is version ID registered on Wikidata (2022-05-09) or local if not found there.
• If keyword is ~, result is empty if local and Wikidata version are the same: ().

Returns:

• Empty, if minimal version condition not matched, or ~ and local version is synchronized.
• Version ID if no parameter, or if wikidata, or local if not found there, or not synchronized.

Examples (test page)

A test page illustrates practical use.

Functions for Lua modules (API)

All functions described above can be used by other modules:

local lucky, WLink = pcall( require, "Module:WLink" )
if type( WLink ) == "table" then
    WLink = WLink.WLink()
else
    -- failure; WLink is the error message
    return "<span class=\"error\">" .. WLink .. "</span>"
end

Subsequently there are available:

• WLink.ansiPercent(story, space)
• WLink.formatURL()
• WLink.getArticleBase()
• WLink.getBaseTitle()
• WLink.getExtension()
• WLink.getFile()
• WLink.getFragment()

  false, if not found; but empty string if empty fragment.

  No leading # in result.

• WLink.getLanguage()
• WLink.getLinktextProblem()
• WLink.getNamespace()
• WLink.getNamespaced(area,at)
  1. area – string or number
  2. at – string
• WLink.getPlain()
• WLink.getProject()
• WLink.getTalkPage()
• WLink.getTarget()
• WLink.getTargetPage()
• WLink.getTitle()
• WLink.getWeblink()
• WLink.getWikilink()
• WLink.isBracketedLink()
• WLink.isBracketedURL()
• WLink.isCategorization()
• WLink.isExternalLink()
• WLink.isInterlanguage()
• WLink.isInterwiki()
• WLink.isMedia()
• WLink.isTalkPage()
• WLink.isTitledLink()
• WLink.isValidLink()
• WLink.isValidLinktext()
• WLink.isWeblink()
• WLink.isWikilink()
• WLink.pageLink(attempt, appear, assure)

  Yields robust internal link to a page

  • attempt – presumable internal link; string oder table as of WLink.wikilink()
  • appear – (optional) link text string oder true
  • assure – (optional) method to protect against template syntax: URL or WIKI

• WLink.pageTarget()

  Yields string with robust normalized internal link target

• WLink.wikilink()

  Yields table with wikilink components, else false.

  Components might be, if provided:

  • lead – leading colon : present and required, if true
  • project – project interwiki within wikifarm (recommendable brief notation)
  • lang – known language version (downcased)
  • ns – number of namespace
  • space – local canonical name of namespace
  • title – page title as provided; at least empty string

• WLink.failsafe(atleast)

Versioning interface

1. atleast
   optional
   nil or minimum version or wikidata or ~ for synchronisation

returns: Version ID as string or false

If succeeding, the WLink.get*() return a string, the WLink.is*() true (if no exception mentioned); on failure always false.

Installation on other WMF projects

Follow the steps:

1. Copy main module Module:WLink into your project.
   • If possible keep the name WLink.
   • If another name is required due to conflict or naming convention or non-latin script then choose a different one.
2. Register this module at d:Q19363224.
3. URLutil should be available; otherwise related functions will not work.
4. Ready.
5. Consider translation of doc page.

Usage

General library; no limitations.

Dependencies

• URLutil