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-rw-r--r--src/lbaselib.js13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/lbaselib.js b/src/lbaselib.js
index 9cc4fb1..fa0349b 100644
--- a/src/lbaselib.js
+++ b/src/lbaselib.js
@@ -165,6 +165,18 @@ const luaB_error = function(L) {
return lapi.lua_error(L);
};
+const luaB_assert = function(L) {
+ if (lapi.lua_toboolean(L, 1)) /* condition is true? */
+ return lapi.lua_gettop(L); /* return all arguments */
+ else {
+ lauxlib.luaL_checkany(L, 1); /* there must be a condition */
+ lapi.lua_remove(L, 1); /* remove it */
+ lapi.lua_pushliteral(L, "assertion failed!"); /* default message */
+ lapi.lua_settop(L, 1); /* leave only message (default if no other one) */
+ return luaB_error(L); /* call 'error' */
+ }
+};
+
const luaB_select = function(L) {
let n = lapi.lua_gettop(L);
if (lapi.lua_type(L, 1) === CT.LUA_TSTRING && lapi.lua_tostring(L, 1) === "#") {
@@ -220,6 +232,7 @@ const luaB_xpcall = function(L) {
const base_funcs = {
"collectgarbage": function () {},
+ "assert": luaB_assert,
"print": luaB_print,
"tostring": luaB_tostring,
"tonumber": luaB_tonumber,