Module:Row numbers

require('Module:No globals');

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) if not frame.args[1]:match ('^%s*\127[^\127]*UNIQ%-%-nowiki%-%x%x%x%x%x%x%x%x%-QINU[^\127]*\127%s*$') then	-- make sure that what we get for input has been wrapped in ... tags return 'error: missing nowiki tags '; end

count = (frame.args.index and frame.args.index:match ('^%d+$') or 1) - 1;	-- only if a number; |index= may be omitted (nil), or empty string, or non-digit; initial value is 0

local tbl_str = mw.text.unstripNoWiki (frame.args[1]);						-- get the table from the nowiki tags passed as arguments

tbl_str = tbl_str:gsub ('&lt;', '<');										-- undo 's escaping of the wikitext tbl_str = tbl_str:gsub ('&gt;', '>');										-- (mw.text.decode (tbl_str); is too aggressive)

return frame:preprocess (tbl_str:gsub('_row_count[_%w]*', get_count));		-- if there is at least one of our special reserved words, replace it with a count end

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

return { row_numbers = row_numbers }