Software / code / prosody
Comparison
util/bitcompat.lua @ 10411:db2a06b9ff98
Merge 0.11->trunk
| author | Kim Alvefur <zash@zash.se> |
|---|---|
| date | Sat, 16 Nov 2019 16:52:31 +0100 |
| parent | 10241:48f7cda4174d |
| child | 12573:0f4feaf9ca64 |
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| 10410:659b577f280c | 10411:db2a06b9ff98 |
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| 1 -- Compatibility layer for bitwise operations | |
| 2 | |
| 3 -- First try the bit32 lib | |
| 4 -- Lua 5.3 has it with compat enabled | |
| 5 -- Lua 5.2 has it by default | |
| 6 if _G.bit32 then | |
| 7 return _G.bit32; | |
| 8 else | |
| 9 -- Lua 5.1 may have it as a standalone module that can be installed | |
| 10 local ok, bitop = pcall(require, "bit32") | |
| 11 if ok then | |
| 12 return bitop; | |
| 13 end | |
| 14 end | |
| 15 | |
| 16 do | |
| 17 -- Lua 5.3 and 5.4 would be able to use native infix operators | |
| 18 local ok, bitop = pcall(require, "util.bit53") | |
| 19 if ok then | |
| 20 return bitop; | |
| 21 end | |
| 22 end | |
| 23 | |
| 24 do | |
| 25 -- Lastly, try the LuaJIT bitop library | |
| 26 local ok, bitop = pcall(require, "bit") | |
| 27 if ok then | |
| 28 return bitop; | |
| 29 end | |
| 30 end | |
| 31 | |
| 32 error "No bit module found. See https://prosody.im/doc/depends#bitop"; |