Function arrayLen

pj_scripting/src/luau_engine.cpp:128–139

Length of the array part of the table at `idx` (counts 1..n until the first nil). Avoids depending on lua_objlen's exact spelling across Luau versions.

// Length of the array part of the table at `idx` (counts 1..n until the first
// nil). Avoids depending on lua_objlen's exact spelling across Luau versions.
int arrayLen(lua_State* L, int idx) {
  int n = 0;
  while (true) {
    lua_rawgeti(L, idx, n + 1);
    const bool is_nil = lua_isnil(L, -1);
    lua_pop(L, 1);
    if (is_nil) {
      return n;
    }
    ++n;
  }
}

std::string stringField(lua_State* L, int table_idx, const char* key, const std::string& fallback = "") {
  lua_rawgetfield(L, table_idx, key);