# Module:Delink

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-- This module de-links most wikitext.

require('Module:No globals')

local p = {}

local getArgs

local function delinkReversePipeTrick(s)

       if s:match("^%[%[|.*[|\n]") then -- Check for newlines or multiple pipes.
           return s
       else
           return s:match("%[%[|(.*)%]%]")
       end

end

local function delinkPipeTrick(s)

       local linkarea, display = "", ""
       -- We need to deal with colons, brackets, and commas, per Help:Pipe trick.

       -- First, remove the text before the first colon, if any.
       if s:match(":") then
           s = s:match("%[%[.-:(.*)|%]%]")
       -- If there are no colons, grab all of the text apart from the square brackets and the pipe.
       else
           s = s:match("%[%[(.*)|%]%]")
       end

       -- Next up, brackets and commas.
       if s:match("%(.-%)$") then -- Brackets trump commas.
           s = s:match("(.-) ?%(.-%)$")
       elseif s:match(",") then -- If there are no brackets, display only the text before the first comma.
           s = s:match("(.-),.*$")
       end
       return s

end

local function delinkWikilink(s)

       local result = s
       -- Deal with the reverse pipe trick.
       if result:match("%[%[|") then
           return delinkReversePipeTrick(result)
       end

       result = mw.uri.decode(result, "PATH") -- decode percent-encoded entities. Leave underscores and plus signs.
       result = mw.text.decode(result, true) -- decode HTML entities.

       -- Check for bad titles. To do this we need to find the
       -- title area of the link, i.e. the part before any pipes.
       local titlearea
       if result:match("|") then -- Find if we're dealing with a piped link.
           titlearea = result:match("^%[%[(.-)|.*%]%]")
       else
           titlearea = result:match("^%[%[(.-)%]%]")
       end
       -- Check for bad characters.
       if mw.ustring.match(titlearea, "[%[%]<>{}%%?%c\n]") then
           return s
       end

       -- Check for categories, interwikis, and files.
       local colonprefix = result:match("%[%[(.-):.*%]%]") or "" -- Get the text before the first colon.
       local ns = mw.site.namespaces[colonprefix] -- see if this is a known namespace
       if mw.language.isKnownLanguageTag(colonprefix)
       or ( ns and ( ns.canonicalName == "پرونده" or ns.canonicalName == "رده" ) ) then
           return ""
       end

       -- Remove the colon if the link is using the Help:Colon trick.
       if result:match("%[%[:") then
           result = "[[" .. result:match("%[%[:(.*%]%])")
       end

       -- Deal with links using the Help:Pipe trick.
       if mw.ustring.match(result, "^%[%[[^|]*|%]%]") then
           return delinkPipeTrick(result)
       end

       -- Find the display area of the wikilink
       if result:match("|") then -- Find if we're dealing with a piped link.
           result = result:match("^%[%[.-|(.+)%]%]")
           -- Remove new lines from the display of multiline piped links,
           -- where the pipe is before the first new line.
           result = result:gsub("\n", "")
       else
           result = result:match("^%[%[(.-)%]%]")
       end

       return result

end

local function delinkURL(s)

       -- Assume we have already delinked internal wikilinks, and that
       -- we have been passed some text between two square brackets [foo].

       -- If the text contains a line break it is not formatted as a URL, regardless of other content.
       if s:match("\n") then
           return s
       end

       -- Check if the text has a valid URL prefix and at least one valid URL character.
       local valid_url_prefixes = {"//", "http://", "https://", "ftp://", "gopher://", "mailto:", "news:", "irc://"}
       local url_prefix
       for i,v in ipairs(valid_url_prefixes) do
           if mw.ustring.match(s, '^%[' .. v ..'[^"%s?].*%]' ) then
               url_prefix = v
               break
           end
       end

       -- Get display text
       if not url_prefix then
           return s
       end
       s = s:match("^%[" .. url_prefix .. "(.*)%]") -- Grab all of the text after the URL prefix and before the final square bracket.
       s = s:match('^.-(["<> ?].*)') or "" -- Grab all of the text after the first URL separator character ("<> ).
       s = mw.ustring.match(s, "^%s*(%S.*)$") or "" -- If the separating character was a space, trim it off.

       local s_decoded = mw.text.decode(s, true)
       if mw.ustring.match(s_decoded, "%c") then
           return s
       else
           return s_decoded
       end

end

local function delinkLinkClass(s, pattern, delinkFunction)

       if not type(s) == "string" then
           error("تلاش در پیوندزدایی ورودی غیر رشته‌ای.", 2)
       end
       if not ( type(pattern) == "string" and mw.ustring.sub(pattern, 1, 1) == "^" ) then
           error('الگوی نامعتبر شناسایی شد. الگوها باید با "^" آغاز شوند.', 2)
       end
       -- Iterate over the text string, and replace any matched text. using the
       -- delink function. We need to iterate character by character rather
       -- than just use gsub, otherwise nested links aren't detected properly.
       local result = ""
       while s ~=  do
           -- Replace text using one iteration of gsub.
           s = mw.ustring.gsub(s, pattern, delinkFunction, 1)
           -- Append the left-most character to the result string.
           result = result .. mw.ustring.sub(s, 1, 1)
           s = mw.ustring.sub(s, 2, -1)
       end
       return result

end

function p._delink(args)

       local text = args[1] or ""
       if args.refs == "yes" then
           -- Remove any Help:Strip markers representing ref tags. In most situations
           -- this is not a good idea - only use it if you know what you are doing!
           text = mw.ustring.gsub(text, "?UNIQ%w*%-ref%-%d*%-QINU?", "")
       end
       if not (args.comments == "no") then
           text = text:gsub("<!%-%-.-%-%->", "") -- Remove html comments.
       end
       if not (args.wikilinks == "no") then
           text = delinkLinkClass(text, "^%[%[.-%]%]", delinkWikilink) -- De-link wikilinks.
       end
       if not (args.urls == "no") then
           text = delinkLinkClass(text, "^%[.-%]", delinkURL) -- De-link URLs.
       end
       if not (args.whitespace == "no") then
           -- Replace single new lines with a single space, but leave double new lines
           -- and new lines only containing spaces or tabs before a second new line.
           text = mw.ustring.gsub(text, "([^\n \t][ \t]*)\n([ \t]*[^\n \t])", "%1 %2")
           text = text:gsub("[ \t]+", " ") -- Remove extra tabs and spaces.
       end
       return text

end

function p.delink(frame)

       if not getArgs then
       	getArgs = require('Module:Arguments').getArgs
       end
       return p._delink(getArgs(frame, {wrappers = 'الگو:پیوندزدایی'}))

end

return p

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