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Module:Redirect: Difference between revisions

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Module:Redirect (view source)

Revision as of 19:05, 7 November 2022

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46 revisions imported from wikipedia:Module:Redirect
(Problem is, the manual doesn't say whether () is after : or . Should remember ...)
m (46 revisions imported from wikipedia:Module:Redirect)
 
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-- This module provides functions for getting the target of a redirect page.
---- This module accepts the name of a single page. It determines if the page is a redirect; if so it looks up the page, extracts the target, and returns the target name as text. Its usage is {{#invoke:redirect|main|redirect-page-name}}. The template neither takes nor gives square brackets, so to show the result as a link use [[{{#invoke:redirect|main|redirect-page-name}}]]. An error is produced if the redirect does not exist, but for versatility no error is given if the file is not a redirect (returns the original text) or if the file name is blank (returns blank).
 
local p = {}
 
-- Gets a mw.title object, using pcall to avoid generating script errors if we
-- are over the expensive function count limit (among other possible causes).
local function getTitle(...)
local success, titleObj = pcall(mw.title.new, ...)
if success then
return titleObj
else
return nil
end
end
 
-- Gets the name of a page that a redirect leads to, or nil if it isn't a
-- redirect.
function p.getTargetFromText(text)
local target = string.match(
text,
"^%s*#[Rr][Ee][Dd][Ii][Rr][Ee][Cc][Tt]%s*:?%s*%[%[([^%[%]|]-)%]%]"
) or string.match(
text,
"^%s*#[Rr][Ee][Dd][Ii][Rr][Ee][Cc][Tt]%s*:?%s*%[%[([^%[%]|]-)|[^%[%]]-%]%]"
)
return target and mw.uri.decode(target, 'PATH')
end
 
-- Gets the target of a redirect. If the page specified is not a redirect,
-- returns nil.
function p.getTarget(page, fulltext)
-- Get the title object. Both page names and title objects are allowed
-- as input.
local titleObj
if type(page) == 'string' or type(page) == 'number' then
titleObj = getTitle(page)
elseif type(page) == 'table' and type(page.getContent) == 'function' then
titleObj = page
else
error(string.format(
"bad argument #1 to 'getTarget'"
.. " (string, number, or title object expected, got %s)",
type(page)
), 2)
end
if not titleObj then
return nil
end
local targetTitle = titleObj.redirectTarget
if targetTitle then
if fulltext then
return targetTitle.fullText
else
return targetTitle.prefixedText
end
else
return nil
end
end
 
--[[
-- Given a single page name determines what page it redirects to and returns the
-- target page name, or the passed page name when not a redirect. The passed
-- page name can be given as plain text or as a page link.
--
-- Returns page name as plain text, or when the bracket parameter is given, as a
-- page link. Returns an error message when page does not exist or the redirect
-- target cannot be determined for some reason.
--]]
function p.luaMain(rname, bracket, fulltext)
if type(rname) ~= "string" or not rname:find("%S") then
return nil
end
bracket = bracket and "[[%s]]" or "%s"
rname = rname:match("%[%[(.+)%]%]") or rname
local target = p.getTarget(rname, fulltext)
local ret = target or rname
ret = getTitle(ret)
if ret then
if fulltext then
ret = ret.fullText
else
ret = ret.prefixedText
end
return bracket:format(ret)
else
return nil
end
end
 
-- Provides access to the luaMain function from wikitext.
function p.main(frame)
local args = require('Module:Arguments').getArgs(frame, {frameOnly = true})
args=frame.args
return p.luaMain(args[1], args.bracket, args.fulltext) or ''
parent=frame.getParent(frame)
end
if parent then pargs = parent.args else pargs={} end
 
local rname=args[1] or pargs[1] or ""
-- Returns true if the specified page is a redirect, and false otherwise.
if redirect=="" then return "" end
function p.luaIsRedirect(page)
local rpage=mw.title.new(rname)
local titleObj = getTitle(page)
local err=""
if not titleObj then
if rpage then -- avoid possibly expensive FileExists if we don't have anything
return false
if rpage.id ~= 0 then
end
-- if rpage.fileExists then
if rpagetitleObj.isRedirect then
return true
return (tostring(mw.ustring.find(tostring(rpage.getContent(rpage)),"REDIRECT(.-)%[%[(.-)%]%]")) or [=[<span style="text-color:red;">[[Module:redirect]] error: failed to understand - [[]=] .. rname .. [=[]]</span]=])
else
else return rname -- not a redirect so leave the original text (for some general-purpose template use)
return false
end
end
-- else err="File does not exist: "
-- end
 
else err="File not found (id=0): "
-- Provides access to the luaIsRedirect function from wikitext, returning 'yes'
end
-- if the specified page is a redirect, and the blank string otherwise.
else err="File not found (mw.title.new failed)"
function p.isRedirect(frame)
end
local args = require('Module:Arguments').getArgs(frame, {frameOnly = true})
return [=[<span style="text-color:red;">[[Module:redirect]] error: ]=] .. err .. [=[ - [[]=] .. rname .. [=[]]</span>]=]
if p.luaIsRedirect(args[1]) then
return 'yes'
else
return ''
end
end
 
Tomartino
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