From 37374ae95e615cc02da0c64a43a7a30b7156fea4 Mon Sep 17 00:00:00 2001 From: Kim Alvefur Date: Sun, 6 Jan 2019 10:39:33 +0100 Subject: util.http: Pre-generate urlencoding mappings (optimization) Function calls are more expensive than table lookups --- util/http.lua | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) (limited to 'util/http.lua') diff --git a/util/http.lua b/util/http.lua index cfb89193..1730d4d4 100644 --- a/util/http.lua +++ b/util/http.lua @@ -6,24 +6,25 @@ -- local format, char = string.format, string.char; -local pairs, ipairs, tonumber = pairs, ipairs, tonumber; +local pairs, ipairs = pairs, ipairs; local t_insert, t_concat = table.insert, table.concat; +local url_codes = {}; +for i = 0, 255 do + local c = char(i); + local u = format("%%%02x", i); + url_codes[c] = u; + url_codes[u] = c; +end local function urlencode(s) - return s and (s:gsub("[^a-zA-Z0-9.~_-]", function (c) return format("%%%02x", c:byte()); end)); + return s and (s:gsub("[^a-zA-Z0-9.~_-]", url_codes)); end local function urldecode(s) - return s and (s:gsub("%%(%x%x)", function (c) return char(tonumber(c,16)); end)); + return s and (s:gsub("%%%x%x", url_codes)); end local function _formencodepart(s) - return s and (s:gsub("%W", function (c) - if c ~= " " then - return format("%%%02x", c:byte()); - else - return "+"; - end - end)); + return s and (urlencode(s):gsub("%%20", "+")); end local function formencode(form) -- cgit v1.2.3