view util/bitcompat.lua @ 13429:6cdc6923d65a

util.strbitop: Add common_prefix_bits() method This returns the number of bits that two strings have in common. It is significantly more efficient than similar calculations in Lua.
author Matthew Wild <mwild1@gmail.com>
date Fri, 23 Feb 2024 12:08:37 +0000
parents d10957394a3c
children de902cc0d46c
line wrap: on
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-- 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;
end

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

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