--- Python-style URL quoting library. -- -- @module pl.url local url = {} local function quote_char(c) return string.format("%%%02X", string.byte(c)) end --- Quote the url, replacing special characters using the '%xx' escape. -- @string s the string -- @bool quote_plus Also escape slashes and replace spaces by plus signs. -- @return The quoted string, or if `s` wasn't a string, just plain unaltered `s`. function url.quote(s, quote_plus) if type(s) ~= "string" then return s end s = s:gsub("\n", "\r\n") s = s:gsub("([^A-Za-z0-9 %-_%./])", quote_char) if quote_plus then s = s:gsub(" ", "+") s = s:gsub("/", quote_char) else s = s:gsub(" ", "%%20") end return s end local function unquote_char(h) return string.char(tonumber(h, 16)) end --- Unquote the url, replacing '%xx' escapes and plus signs. -- @string s the string -- @return The unquoted string, or if `s` wasn't a string, just plain unaltered `s`. function url.unquote(s) if type(s) ~= "string" then return s end s = s:gsub("+", " ") s = s:gsub("%%(%x%x)", unquote_char) s = s:gsub("\r\n", "\n") return s end return url