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-rw-r--r--src/lauxlib.js2
-rw-r--r--src/lobject.js4
-rw-r--r--src/lstrlib.js14
3 files changed, 18 insertions, 2 deletions
diff --git a/src/lauxlib.js b/src/lauxlib.js
index f77fe5e..3ee04a4 100644
--- a/src/lauxlib.js
+++ b/src/lauxlib.js
@@ -54,7 +54,7 @@ const findfield = function(L, objidx, level) {
const pushglobalfuncname = function(L, ar) {
let top = lapi.lua_gettop(L);
ldebug.lua_getinfo(L, 'f', ar); /* push function */
- lapi.lua_getfield(L, lua.LUA_REGISTRYINDEX, lua.LUA_LOADED_TABLE);
+ lapi.lua_getfield(L, lua.LUA_REGISTRYINDEX, LUA_LOADED_TABLE);
if (findfield(L, top + 1, 2)) {
let name = lapi.lua_tostring(L, -1);
if (name.startsWith("_G.")) {
diff --git a/src/lobject.js b/src/lobject.js
index 719d7a6..e1c3e97 100644
--- a/src/lobject.js
+++ b/src/lobject.js
@@ -452,8 +452,10 @@ module.exports.LocVar = LocVar;
module.exports.TValue = TValue;
module.exports.Table = Table;
module.exports.UTF8BUFFSZ = UTF8BUFFSZ;
+module.exports.intarith = intarith;
module.exports.luaO_chunkid = luaO_chunkid;
module.exports.luaO_hexavalue = luaO_hexavalue;
module.exports.luaO_int2fb = luaO_int2fb;
module.exports.luaO_str2num = luaO_str2num;
-module.exports.luaO_utf8desc = luaO_utf8desc; \ No newline at end of file
+module.exports.luaO_utf8desc = luaO_utf8desc;
+module.exports.numarith = numarith; \ No newline at end of file
diff --git a/src/lstrlib.js b/src/lstrlib.js
index b3d5aea..1d3a7cc 100644
--- a/src/lstrlib.js
+++ b/src/lstrlib.js
@@ -18,6 +18,19 @@ const posrelat = function(pos, len) {
else return len + pos + 1;
};
+const str_sub = function(L) {
+ let s = lauxlib.luaL_checkstring(L, 1);
+ let l = s.length;
+ let start = posrelat(lauxlib.luaL_checkinteger(L, 2), l);
+ let end = posrelat(lauxlib.luaL_optinteger(L, 3, -1), l);
+ if (start < 1) start = 1;
+ if (end > l) end = l;
+ if (start <= end)
+ lapi.lua_pushstring(L, s.slice(start - 1, (start - 1) + (end - start + 1)));
+ else lapi.lua_pushliteral(L, "");
+ return 1;
+};
+
const str_len = function(L) {
lapi.lua_pushinteger(L, lauxlib.luaL_checkstring(L, 1).length);
return 1;
@@ -371,6 +384,7 @@ const strlib = {
"lower": str_lower,
"rep": str_rep,
"reverse": str_reverse,
+ "sub": str_sub,
"upper": str_upper
};