Module:Prime limit navigation

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Note: Do not invoke this module directly; use the corresponding template instead: Template:Prime limit navigation.

This module depends on the following other modules: Module: Yesno

This module generates the navigation bar for prime limit pages.

---

local p = {}

local yesno = require("Module:Yesno")
local PRIME_LIST = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127}

local function table_index(t, v)
	for i, ti in ipairs (t) do
		if v == ti then
			return i
		end
	end
	return nil
end

function p.prime_limit_navigation(frame)
	local i = table_index(PRIME_LIST, tonumber (frame.args['limit']))
	local entry_prev, entry_curr, entry_next, out_elem = "", "", "", ""
	
	if PRIME_LIST[i] then
		entry_curr = string.format("[[%d-limit]]",  PRIME_LIST[i])
		if PRIME_LIST[i - 1] then
			entry_prev = string.format("<span style=\"font-size: 0.8em;\">"
				.. "[[%d-limit|'''&larr;'''&nbsp;%d-limit]]"
				.. "</span>&nbsp;&nbsp;", PRIME_LIST[i - 1], PRIME_LIST[i - 1])
		else
			entry_prev = ""
		end
		if PRIME_LIST[i + 1] then
			entry_next = string.format("&nbsp;&nbsp;<span style=\"font-size: 0.8em;\">"
				.. "[[%d-limit|%d-limit&nbsp;'''&rarr;''']]"
				.. "</span>", PRIME_LIST[i + 1], PRIME_LIST[i + 1])
		else
			entry_next = ""
		end
	end
	
	local result = "<div class=\"toccolours\" style=\"float: right; margin: 0px 0px 4px 4px;\">\n"
		.. "{{centre|'''[[Prime limit]]'''}}\n"
		.. "<hr />\n"
		.. string.format("%s%s%s\n", entry_prev, entry_curr, entry_next)
		.. "</div>"
	
	if yesno(frame.args["debug"]) == true then
		result = "<syntaxhighlight lang=\"wikitext\">" .. result .. "</syntaxhighlight>"
	end
	
	return frame:preprocess(result)
end

return p