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util/hex.lua @ 10590:257dc26e8e65
util.array: Add a test case for a behavior change in Lua 5.3
In Lua 5.1 and 5.2 the __eq metamethod is not invoked if the other
argument is of a different metatable, but in Lua 5.3 it is.
author | Kim Alvefur <zash@zash.se> |
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date | Tue, 14 Jan 2020 23:39:47 +0100 |
parent | 6802:442019e955dc |
child | 12355:a0ff5c438e9d |
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local s_char = string.char; local s_format = string.format; local s_gsub = string.gsub; local s_lower = string.lower; local char_to_hex = {}; local hex_to_char = {}; do local char, hex; for i = 0,255 do char, hex = s_char(i), s_format("%02x", i); char_to_hex[char] = hex; hex_to_char[hex] = char; end end local function to(s) return (s_gsub(s, ".", char_to_hex)); end local function from(s) return (s_gsub(s_lower(s), "%X*(%x%x)%X*", hex_to_char)); end return { to = to, from = from }