မေႃႇၵျူး:ugly hacks

This module provides templates with functions which cannot be accessed any other way. When a function is not used, it should be removed.

Avoid using this module. If you find yourself writing a template which needs it, consider re-writing the template in Lua.

This module tracks templates in which its functions are used, using the tracking template mechanism; the tracking templates' names are of the form Template:tracking/ugly hacks/function_name and Template:tracking/ugly hacks/function_name/from template_name. To prevent it from becoming ineffective, wrappers around functions in this module should not be created; the {{#invoke:}} should be put directly where it is needed.

To further discourage their use, functions in this module are intentionally undocumented. To discover their usage purpose and syntax, please refer to mw:Extension:Scribunto/Lua reference manual.

Questions about this module and its possible replacements may be raised at Wiktionary:Grease pit.

---

local export = {}

function export.explode(frame)
	local args = frame.args
	local wanted_index, i = tonumber(args[3]), 1
	for item in require("Module:string utilities").gsplit(args[1], args[2], true) do
		if i == wanted_index then
			return item
		end
		i = i + 1	
	end
	return ""
end

function export.substr(frame)
	local args = frame.args
	return require("Module:string utilities").sub(args[1] or "", tonumber(args[2]) or 1, tonumber(args[3]) or -1)
end

function export.find(frame)
	local args = frame.args
	return require("Module:string utilities").find(args[1] or "", args[2] or "", 1, true) or ""
end

function export.find_pattern(frame)
	local args = frame.args
	return require("Module:string utilities").find(args[1] or "", args[2] or "", 1, false) or ""
end

function export.replace(frame)
	local args = frame.args
	return (require("Module:string utilities").gsub(args[1] or "", args[2] or "", args[3] or ""))
end

function export.match(frame)
	local args = frame.args
	return (require("Module:string utilities").match(args[1] or "", args[2] or ""))
end

function export.is_valid_page_name(frame)
	return require("Module:pages").is_valid_page_name(frame.args[1]) and "valid" or ""
end

local mt = {}

function mt:__index(k)
	local track = require("Module:debug/track")
	local parent = mw.getCurrentFrame():getParent()
	track("ugly hacks/" .. k)
	if parent then
		track("ugly hacks/" .. k .. "/from " .. parent:getTitle())
	end
	return export[k]
end

return setmetatable({}, mt)