Module:String: Difference between revisions

This function implements that features of {{subr|s|skip|max}} and

is kept in order to maintain these older templates.

Uses only numbered paramameters to preserve spaces (caller may trim

whitespaces by passing the parameter explicitly by numbering the

parameters).

Accepts negative values as relative to strng length.

No error is returned if attempting to read past end of string or

before start of string.

Currently does not parse and replace placeholders for nowiki tags.

local s = frame.args[1] or '';

local skip = tonumber( frame.args[2] ) or 0;

local max = tonumber( frame.args[3] ) or 0;

local len = mw.ustring.len( s );

-- convert negative values of max and skip as relative to string length

if max < 0 then

max = len + max

end

if skip < 0 then

skip = len + skip

end

-- check boundaries to reduce the requested max

if skip < 0 then -- if before start of string

max = max + skip

skip = 0 -- skip can't underflow now

end

if max > len - skip then -- if past end of string

max = len - skip -- max can't overflow now

end

if max <= 0 then

return '' -- nothing left to return

end

return mw.ustring.sub( s, skip + 1, skip + max )

replace = string.gsub( replace, "%%", "%%%%" ) --Only need to escape replacement sequences.

-- findpagetext returns the position of a piece of text in a page

-- First positional parameter or |text is the search text

-- Optional parameter |title is the page title, defaults to current page

-- Optional parameter |plain is either true for plain search (default) or false for Lua pattern search

-- Optional parameter |nomatch is the return value when no match is found; default is nil

function str._findpagetext(args)

-- process parameters

local nomatch = args.nomatch or ""

if nomatch == "" then nomatch = nil end

--

local text = mw.text.trim(args[1] or args.text or "")

if text == "" then return nil end

--

local title = args.title or ""

local titleobj

if title == "" then

titleobj = mw.title.getCurrentTitle()

else

titleobj = mw.title.new(title)

end

--

local plain = args.plain or ""

if plain:sub(1, 1) == "f" then plain = false else plain = true end

-- get the page content and look for 'text' - return position or nomatch

local content = titleobj and titleobj:getContent()

return content and mw.ustring.find(content, text, 1, plain) or nomatch

end

function str.findpagetext(frame)

local args = frame.args

local pargs = frame:getParent().args

for k, v in pairs(pargs) do

args[k] = v

end

if not (args[1] or args.text) then return nil end

-- just the first value

return (str._findpagetext(args))

end

return ( string.gsub( pattern_str, "[%(%)%.%%%+%-%*%?%[%^%$%]]", "%%%0" ) )