feat: add vim.text module (#26069)

runtime/lua/vim/text.lua

@@ -0,0 +1,32 @@
+--- 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