util/bitcompat.lua
author Kim Alvefur <zash@zash.se>
Sun, 21 Feb 2021 06:13:19 +0100
changeset 11393 29e7ed75ed3f
parent 10245 48f7cda4174d
child 12577 0f4feaf9ca64
permissions -rw-r--r--
mod_http_errors: Add way to reuse the error page template module:fire_event("http-message", {title = "hello"; message = "world"}) Goal is to enable consistent messages from Prosody. Not necessarily error messages, but warnings or just notices. This does cause some drift in the purpose of mod_http_errors, but that's okay.

-- Compatibility layer for bitwise operations

-- First try the bit32 lib
-- Lua 5.3 has it with compat enabled
-- Lua 5.2 has it by default
if _G.bit32 then
	return _G.bit32;
else
	-- Lua 5.1 may have it as a standalone module that can be installed
	local ok, bitop = pcall(require, "bit32")
	if ok then
		return bitop;
	end
end

do
	-- Lua 5.3 and 5.4 would be able to use native infix operators
	local ok, bitop = pcall(require, "util.bit53")
	if ok then
		return bitop;
	end
end

do
	-- Lastly, try the LuaJIT bitop library
	local ok, bitop = pcall(require, "bit")
	if ok then
		return bitop;
	end
end

error "No bit module found. See https://prosody.im/doc/depends#bitop";