Module:Autolink

Documentation for this module may be created at Module:Autolink/doc

--
-- implements {{Autolink}} and {{Unlink}}
--

local p = {}
local ustring = mw.ustring
local text = mw.text

function p.link( frame )
    local args = frame:getParent().args
    -- for testing from console
    -- local args = frame
    -- 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 links, listmarkup, el, link, txt, formatl, formatr

    -- set default to stop errors
    args[1] = args[1] and text.trim( args[1] ) or ''

    if ustring.find( args[1], zwnj ) == 1 then
        links = ustring.gsub( args[1], '%[%[[Cc]ategory:', '[[:Category:' )
        links = ustring.gsub( links, '%[%[[Ff]ile:', '[[:File:' )
        links = ustring.gsub( links, '%[%[[Ii]mage:', '[[:File:' )
        links = ustring.gsub( links, zwnj, '' )
        return links
    else
        links = text.split( args[1], '\n' )

        args[2] = #links == 1 and args[2]

        listmarkup = #links == 1 and ''

        for i=1, #links do
            el = text.trim( links[i] )

            -- catch empty string at the start of lists
            if not ustring.match( el, '^[*#;:]?$' ) then
                if listmarkup ~= '' then
                    listmarkup = ustring.match( el, '^([*#;:])' ) or '*'
                    el = ustring.gsub( el, '^[*#;:]%s*', '' )
                end

                if ustring.find( el, zwnj ) or ustring.find( el, '%[%[' ) then
                    links[i] = table.concat( { listmarkup, el }, '' )
                else
                    link = el
                    txt = args[2] or el
                    formatl = ''
                    formatr = ''

                    link = ustring.gsub( link, '""', '' )
                    link = ustring.gsub( link, "'''?", '' )

                    -- check for formatting that can be moved out of the link entirely
                    if ustring.find( txt, '^""' ) and ustring.find( txt, '""$' ) then
                        formatl = '"'
                        formatr = '"'
                        txt = ustring.gsub( txt, '""', '' )
                    else
                        txt = ustring.gsub( txt, '""', '"' )
                    end
                    if ustring.find( txt, "^'''" ) and ustring.find( txt, "'''$" ) then
                        formatl = formatl .. "'''"
                        formatr = "'''" .. formatr
                        txt = ustring.gsub( txt, "^'''", '' )
                        txt = ustring.gsub( txt, "'''$", '' )
                    end
                    if ustring.find( txt, "^''" ) and ustring.find( txt, "''$" ) then
                        formatl = formatl .. "''"
                        formatr = "''" .. formatr
                        txt = ustring.gsub( txt, "^''", '' )
                        txt = ustring.gsub( txt, "''$", '' )
                    end

                    if link == txt then
                        links[i] = table.concat( { listmarkup, formatl, '[[', link, ']]', formatr }, '' )
                    else
                        links[i] = table.concat( { listmarkup, formatl, '[[', link, '|', txt, ']]', formatr }, '' )
                    end
                end
            end
        end

        links = table.concat( links, '\n' )
        links = ustring.gsub( links, zwnj, '' )
        links = ustring.gsub( links, '%[%[[Cc]ategory:', '[[:Category:' )
        links = ustring.gsub( links, '%[%[[Ff]ile:', '[[:File:' )
        links = ustring.gsub( links, '%[%[[Ii]mage:', '[[:File:' )
        links = text.trim( links )
        return links
    end
end

function p.unlink( frame )
    local args = frame:getParent().args
    return args[1] and ( ustring.match( args[1], '%[%[:?(.-)[|%]]' ) or text.trim( args[1] ) )
end

return p