Module:NRHP row counter

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-- This module counts table rows in NRHP tables that use Template:NRHP row.

local p = {}
local getArgs

function p.main(frame)
	if not getArgs then
		getArgs = require('Module:Arguments').getArgs
	end
	return p._main(getArgs(frame, {wrappers = 'Template:NRHP row counter'}))
end

function p._main(args)
	-- Get the title object.
	local titleObj
	do
		local success
		success, titleObj = pcall(mw.title.new, args.page)
		if not success or not titleObj then
			titleObj = mw.title.getCurrentTitle()
		end
	end

	-- Get the page content.
	local content = titleObj:getContent()
	if not content then
		return nil
	end

	-- Find the wikitables on that page.
	local wikitables = {}
	do
		local iWikitable = 0
		local s1 = content:match('^({{NRHP header.-\n|})')
		if s1 then
			iWikitable = iWikitable + 1
			wikitables[iWikitable] = s1
		end
		for s in content:gmatch('\n({{NRHP header.-\n|})') do
			iWikitable = iWikitable + 1
			wikitables[iWikitable] = s
		end
	end


	-- Find the wikitable to work on.
	local wikitable
	if args.id then
		for i, s in ipairs(wikitables) do
			if s:match('tableID *= *" *(%w+) *"') == args.id then
				wikitable = s
				break
			end
		end
	else
		wikitable = wikitables[tonumber(args.tableno) or 1]
	end
	if not wikitable then
		return nil
	end

	-- Count the number of rows.
	local count
	do
		local temp
		temp, count = wikitable:gsub('NRHP row', 'NRHP row')
	end

	return count

end

return p