neovim/runtime/lua/vim/text.lua
2023-11-16 11:35:54 -06:00

33 lines
757 B
Lua

--- Text processing functions.
local M = {}
--- Hex encode a string.
---
--- @param str string String to encode
--- @return string Hex encoded string
function M.hexencode(str)
local bytes = { str:byte(1, #str) }
local enc = {} ---@type string[]
for i = 1, #bytes do
enc[i] = string.format('%02X', bytes[i])
end
return table.concat(enc)
end
--- Hex decode a string.
---
--- @param enc string String to decode
--- @return string Decoded string
function M.hexdecode(enc)
assert(#enc % 2 == 0, 'string must have an even number of hex characters')
local str = {} ---@type string[]
for i = 1, #enc, 2 do
local n = assert(tonumber(enc:sub(i, i + 1), 16))
str[#str + 1] = string.char(n)
end
return table.concat(str)
end
return M