Module:Row numbers

require('strict');

local count; local hcount;

--[[--< G E T _ C O U N T >

returns a counter value according to the keyword extracted from the table; maintains count and hcount. Inserts a space character ahead of or so that, in the case of negative indexes, the negation operator is not mistaken for part of the wikitable markup. Returns: | - – a cell value instead of: |- – row markup with extraneous text

The keywords have the meanings: _row_count:			use row counter value (count); the hold counter (hcount) is same as count _row_count_hold:	use the value currently assigned to hcount; bump count but do not bump hcount

]]

local function get_count (keyword) count = count + 1;															-- always bump the count if '_row_count' == keyword then												-- bump hcount, return new count value hcount = count; return ' ' .. count;													-- insert a leading space ahead of count elseif '_row_count_hold' == keyword then									-- current hcount value without increment return ' ' .. hcount;													-- insert a leading space ahead of hcount end end

--[[--< R O W _ N U M B E R S >

replaces keywords _row_count and _row_count_hold from the table in frame.args[1]

]]

local function row_numbers (frame) local args = frame.args[1] and frame.args or frame:getParent.args; -- Only use if |index is a number; |index= may be omitted (nil), or empty string, or non-digit -- We subtract one because the get_count function increments this before use. count = (tonumber(args.index) or 1) - 1;

local tbl_str; -- Find out if what we got for input has been wrapped in ... tags if args[1]:match ('^%s*\127[^\127]*UNIQ%-%-nowiki%-%x%x%x%x%x%x%x%x%-QINU[^\127]*\127%s*$') then -- BUG. The trick does not work in VisualEditor, mobile app, or Special:ExpandTemplates. -- get the table from the nowiki tags passed as arguments tbl_str = mw.text.unstripNoWiki (args[1]);

-- undo 's escaping of the wikitext (mw.text.decode (tbl_str); is too aggressive) tbl_str = tbl_str:gsub('&lt;', '<'):gsub('&gt;', '>'); else -- No MediaWiki bugs here (hopefully), but you need to escape = signs with = like normal. -- It is not possible to circumvent this because named parameters are not passed to Lua in a -- defined order, always have whitespace trimmed, etc.		local parts = {} for _, str in ipairs(args) do			table.insert(parts, str) end tbl_str = table.concat(parts, '|'); end -- if there is at least one of our special reserved words, replace it with a count return frame:preprocess (tbl_str:gsub('_row_count[_%w]*', get_count)); end

----< E X P O R T E D  F U N C T I O N S >--

return { row_numbers = row_numbers }