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--
-- implements {{Autolink}} and {{Unlink}}
--
 
local p = {}
local text = mw.text
 
function p.link( frame )
    if frame == mw.getCurrentFrame() then
        args = frame:getParent().args
    else
        args = frame
    end
 
    -- marker used for {{nolink}} support (doesn't have to be a zero-width non-joiner, that's just what was used in the template version)
    local zwnj = '‌'
    local linkarr, links, listmarkup, el, ell, elr, link, raw, txt, formatl, formatr
 
    -- set default to stop errors
    links = args[1] and text.trim( args[1] ) or ''
 
    -- check for nolink token at the front of the input, which prevents per-link/item processing
    if links:find( zwnj ) ~= 1 then
        linkarr = text.split( links, '\n' )
 
        args[2] = #linkarr == 1 and args[2]
 
        listmarkup = #linkarr == 1 and ''
 
        for i = 1, #linkarr do
            el = text.trim( linkarr[i] )
 
            -- catch empty string at the start of lists
            if not el:find( '^[*#;:]?$' ) then
                if listmarkup ~= '' then
                    listmarkup = ( el:match( '^([*#;:])' ) or '*' ) .. ' '
                    el = el:gsub( '^[*#;:]%s*', '' )
                end
 
                if el:find( zwnj ) or el:find( '%[%[.-|.-%]%]' ) then
                    linkarr[i] = table.concat( { listmarkup, el }, '' )
                else
                    raw = el:find( '%[%[' )
                    ell = el:match( '^"%[%[' ) and '"' or ''
                    elr = el:match( '%]%]"$' ) and '"' or ''
                    el = el:match( '%[%[(.-)%]%]' ) or el
                    link = el
                    txt = args[2] or el
                    formatl = ''
                    formatr = ''
 
                    if raw ~= 1 then
                        link = link:gsub( '""', '' ):gsub( "'''?", '' )
 
                        -- check for formatting that can be moved out of the link entirely
                        if txt:find( '^""' ) and txt:find( '""$' ) then
                            formatl = '"'
                            formatr = '"'
                            txt = txt:gsub( '""', '' )
                        else
                            txt = txt:gsub( '""', '"' )
                        end
                        if txt:find( "^'''" ) and txt:find( "'''$" ) then
                            formatl = formatl .. "'''"
                            formatr = "'''" .. formatr
                            txt = txt:gsub( "'''$", '' ):gsub( "^'''", '' )
                        end
                        if txt:find( "^''" ) and txt:find( "''$" ) then
                            formatl = formatl .. "''"
                            formatr = "''" .. formatr
                            txt = txt:gsub( "''$", '' ):gsub( "^''", '' )
                        end
                    else
                        txt = txt:gsub( "'", ''' )
                    end
                    if txt:find( '[^&]#' ) then
                        txt = txt:gsub( '([^&])#', '%1 § ')
                    end
 
                    if link == txt then
                        linkarr[i] = table.concat( { listmarkup, ell, formatl, '[[', link, ']]', formatr, elr }, '' )
                    else
                        linkarr[i] = table.concat( { listmarkup, ell, formatl, '[[', link, '|', txt, ']]', formatr, elr }, '' )
                    end
                end
            end
        end
 
        links = table.concat( linkarr, '\n' )
    end
 
    links = text.trim( links:gsub( zwnj, '' )
        :gsub( '%[%[[Cc]ategory:', '[[:Category:' )
        :gsub( '%[%[[Ff]ile:', '[[:File:' )
        :gsub( '%[%[[Ii]mage:', '[[:File:' ) )
    return links
end
 
function p.unlink( frame )
    local args = frame:getParent().args
    return args[1] and ( args[1]:match( '%[%[:?(.-)[|%]]' ) or text.trim( args[1] ) )
end
 
return p

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