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try using native bitwise operations without checking lua version #177

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try using native bitwise operations without checking lua version #177

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try using native bitwise operations without checking lua version
jprjr Nov 23, 2020
6c3c69c
bit: check for loadstring and use it if it exists
jprjr Nov 24, 2020
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22 changes: 12 additions & 10 deletions http/bit.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -7,16 +7,18 @@ The bit operations are only done
This means we can ignore the differences between bit libraries.
]]

-- Lua 5.3 has built-in bit operators, wrap them in a function.
if _VERSION == "Lua 5.3" then
-- Use debug.getinfo to get correct file+line numbers for loaded snippet
local info = debug.getinfo(1, "Sl")
return assert(load(("\n"):rep(info.currentline+1)..[[return {
band = function(a, b) return a & b end;
bor = function(a, b) return a | b end;
bxor = function(a, b) return a ~ b end;
}]], info.source))()
end
-- Lua 5.1 uses loadstring for load with a string, Lua 5.2+ just
-- uses load.
local load = loadstring or load

-- Lua 5.3+ has built-in bit operators, wrap them in a function.
local info = debug.getinfo(1, "Sl")
local has_bitwise, bitwise = pcall(load(("\n"):rep(info.currentline+1)..[[return {
band = function(a, b) return a & b end;
bor = function(a, b) return a | b end;
bxor = function(a, b) return a ~ b end;
}]], info.source))
if has_bitwise then return bitwise end

-- The "bit" library that comes with luajit
-- also available for lua 5.1 as "luabitop": http://bitop.luajit.org/
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