Module:Format link

-- Format link -- -- Makes a wikilink from the given link and display values. Links are escaped -- with colons if necessary, and links to sections are detected and displayed -- with " § " as a separator rather than the standard MediaWiki "#". Used in -- the template.

local libraryUtil = require('libraryUtil') local checkType = libraryUtil.checkType local checkTypeForNamedArg = libraryUtil.checkTypeForNamedArg local mArguments -- lazily initialise Module:Arguments local yesno -- lazily initialise Module:Yesno

local p = {}

-- Helper functions

local function getArgs(frame) -- Fetches the arguments from the parent frame. Whitespace is trimmed and -- blanks are removed. mArguments = require('Module:Arguments') return mArguments.getArgs(frame, {parentOnly = true}) end

local function removeInitialColon(s) -- Removes the initial colon from a string, if present. return s:match('^:?(.*)') end

local function italicize(s) -- Italicize a string. return  .. s ..  end

local function maybeItalicize(s, shouldItalicize) -- italicize s if s is a string and the shouldItalicize parameter is true. if s and shouldItalicize then return italicize(s) else return s	end end

local function parseLink(link) -- Parse a link and return a table with the link's components. -- These components are: -- - link: the link, stripped of any initial colon (always present) -- - page: the page name (always present) -- - section: the page name (may be nil) -- - display: the display text, if manually entered after a pipe (may be nil) link = removeInitialColon(link)

-- Find whether a faux display value has been added with the | magic -- word. local prePipe, display = link:match('^(.-)|(.*)$') link = prePipe or link

-- Find the page, if it exists. -- For links like, the page will be nil. local preHash, postHash = link:match('^(.-)#(.*)$') local page if not preHash then -- We have a link like Foo. page = link elseif preHash ~= '' then -- We have a link like Foo. page = preHash end

-- Find the section, if it exists. local section if postHash and postHash ~= '' then section = postHash end return { link = link, page = page, section = section, display = display, } end

-- Main functions

function p.formatLink(frame) -- The formatLink export function, for use in templates. yesno = require('Module:Yesno') local args = getArgs(frame) local link = args[1] if not link then return ' '..			'Error: no link specified (help).'.. ' '	end return p._formatLink{ link = link, display = args[2], italicizePage = yesno(args.italicizepage), italicizeSection = yesno(args.italicizesection), categorizeMissing = args.categorizemissing } end

function p._formatLink(options) -- The formatLink export function, for use in modules. checkType('_formatLink', 1, options, 'table') checkTypeForNamedArg('_formatLink', 'link', options.link, 'string', false) checkTypeForNamedArg(		'_formatLink',		'display',		options.display,		'string',		true	) checkTypeForNamedArg(		'_formatLink',		'italicizePage',		options.italicizePage,		'boolean',		true	) checkTypeForNamedArg(		'_formatLink',		'italicizeSection',		options.italicizeSection,		'boolean',		true	) checkTypeForNamedArg(		'_formatLink',		'categorizeMissing',		options.categorizeMissing,		'string',		true	)

local parsed = parseLink(options.link) local display = options.display or parsed.display local catMissing = options.categorizeMissing local category = ''

--Test if page exists if a diagnostic category is specified if catMissing and (mw.ustring.len(catMissing) > 0) then local title = nil if parsed.page then title = mw.title.new(parsed.page) end if title and (not title.isExternal) and (not title.exists) then category = mw.ustring.format('', catMissing) end end

-- Deal with the case where we don't have to pipe the link if not display and not parsed.section and not options.italicizePage then return mw.ustring.format('%s%s', parsed.link, category) end -- Find the display text for piped links if not display then local page = maybeItalicize(parsed.page, options.italicizePage) local section = maybeItalicize(parsed.section, options.italicizeSection) if not page then display = mw.ustring.format('§ %s', section) elseif section then display = mw.ustring.format('%s § %s', page, section) else display = page end end return mw.ustring.format('%s%s', parsed.link, display, category) end

-- Derived convenience functions

function p.formatPages(options, pages) -- Formats an array of pages using formatLink and the given options table, -- and returns it as an array. Nil values are not allowed. local ret = {} for i, page in ipairs(pages) do		ret[i] = p._formatLink{ link = page, categorizeMissing = options.categorizeMissing, italicizePage = options.italicizePage, italicizeSection = options.italicizeSection }	end return ret end

return p