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Module:Redirect: Difference between revisions

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Module:Redirect (edit)

Revision as of 11:43, 21 May 2021

1,131 bytes added ,  2 years ago
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45 revisions imported from wikipedia:Module:Redirect: see Topic:Vtixlm0q28eo6jtf
(handle apostrophes and other characters escaped by {{TALKPAGENAME}}, per protected edit request by User:Jackmcbarn)
m (45 revisions imported from wikipedia:Module:Redirect: see Topic:Vtixlm0q28eo6jtf)
 
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-- Given a single page name determines what page it redirects to and returns the target page name, or the
-- This module provides functions for getting the target of a redirect page.
-- 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.


-- Thus these are roughly the same:
local p = {}
-- [[{{#invoke:redirect|main|redirect-page-name}}]] and {{#invoke:redirect|main|redirect-page-name|bracket=yes}}
 
-- 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 or not titleObj.isRedirect then
return nil
end
-- Find the target by using string matching on the page content.
local target = p.getTargetFromText(titleObj:getContent() or "")
if target then
local targetTitle = getTitle(target)
if targetTitle then
if fulltext then
return targetTitle.fullText
else
return targetTitle.prefixedText
end
else
return nil
end
else
-- The page is a redirect, but matching failed. This indicates a bug in
-- the redirect matching pattern, so throw an error.
error(string.format(
'could not parse redirect on page "%s"',
fulltext and titleObj.fullText or titleObj.prefixedText
))
end
end


local p = {}
--[[
-- 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)
function p.main(frame)
    -- If called via #invoke, use the args passed into the invoking
local args = require('Module:Arguments').getArgs(frame, {frameOnly = true})
    -- template, or the args passed to #invoke if any exist. Otherwise
return p.luaMain(args[1], args.bracket, args.fulltext) or ''
    -- assume args are being passed directly in from the debug console
end
    -- or from another Lua module.
 
    local origArgs
-- Returns true if the specified page is a redirect, and false otherwise.
    if frame == mw.getCurrentFrame() then
function p.luaIsRedirect(page)
        origArgs = frame:getParent().args
local titleObj = getTitle(page)
        for k, v in pairs( frame.args ) do
if not titleObj then
            origArgs = frame.args
return false
            break
end
        end
if titleObj.isRedirect then
    else
return true
        origArgs = frame
else
    end
return false
    -- Trim whitespace and remove blank arguments.
end
    local args = {}
end
    for k, v in pairs( origArgs ) do
        v = mw.text.trim( v )
        if v ~= '' then
            args[k] = v
        end
    end
    local rname, bracket = args[1], args.bracket
   
    if type(rname) ~= "string" or not mw.ustring.match(rname, "%S") then return end
    bracket = bracket and "[[%s]]" or "%s"
    rname = mw.ustring.match(rname, "%[%[(.+)%]%]") or rname
   
    -- Get the title object, passing the function through pcall
    -- in case we are over the expensive function count limit.
    local noError, rpage = pcall(mw.title.new, rname)
    if not noError or not rpage then
    -- mw.title.new failed, so use the passed page name.
    return mw.ustring.format(bracket, rname)
    elseif not rpage.isRedirect then
        -- the page is not a redirect, so use the normalized name of the page we
        -- were given.
        return mw.ustring.format(bracket, rpage.prefixedText)
    end


    local redirect = mw.ustring.match(rpage:getContent() or "", "^%s*#[Rr][Ee][Dd][Ii][Rr][Ee][Cc][Tt]%s*:?%s*%[%[([^%[%]]-)%]%]" )
-- Provides access to the luaIsRedirect function from wikitext, returning 'yes'
    if redirect then
-- if the specified page is a redirect, and the blank string otherwise.
        -- Decode html entities and percent encodings.
function p.isRedirect(frame)
        redirect = mw.text.decode(redirect, true)
local args = require('Module:Arguments').getArgs(frame, {frameOnly = true})
        redirect = mw.uri.decode(redirect, 'WIKI')
if p.luaIsRedirect(args[1]) then
        return mw.ustring.format(bracket, redirect)
return 'yes'
    else
else
        return mw.ustring.format('<span class="error">[[Module:redirect]] error: could not parse redirect - [[%s]]</span>', rname)
return ''
    end
end
end
end


return p
return p
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