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LuaItemStack: Add __tostring metamethod (#8785)

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* LuaItemStack: Add __tostring metamethod

* Clean up LuaItemStack::checkobject
This commit is contained in:
Paul Ouellette 2020-06-09 13:37:25 -04:00 • committed by GitHub
parent 09e285f38c
commit b16f841756
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 41 additions and 22 deletions
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25
src/script/lua_api/l_item.cpp
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@ -37,6 +37,15 @@ int LuaItemStack::gc_object(lua_State *L)
return 0;
}
// __tostring metamethod
int LuaItemStack::mt_tostring(lua_State *L)
{
LuaItemStack *o = checkobject(L, 1);
std::string itemstring = o->m_stack.getItemString(false);
lua_pushfstring(L, "ItemStack(\"%s\")", itemstring.c_str());
return 1;
}
// is_empty(self) -> true/false
int LuaItemStack::l_is_empty(lua_State *L)
{
@ -433,12 +442,9 @@ int LuaItemStack::create(lua_State *L, const ItemStack &item)
return 1;
}
LuaItemStack* LuaItemStack::checkobject(lua_State *L, int narg)
LuaItemStack *LuaItemStack::checkobject(lua_State *L, int narg)
{
luaL_checktype(L, narg, LUA_TUSERDATA);
void *ud = luaL_checkudata(L, narg, className);
if(!ud) luaL_typerror(L, narg, className);
return *(LuaItemStack**)ud; // unbox pointer
return *(LuaItemStack **)luaL_checkudata(L, narg, className);
}
void LuaItemStack::Register(lua_State *L)
@ -448,9 +454,10 @@ void LuaItemStack::Register(lua_State *L)
luaL_newmetatable(L, className);
int metatable = lua_gettop(L);
// hide metatable from Lua getmetatable()
lua_pushliteral(L, "__metatable");
lua_pushvalue(L, methodtable);
lua_settable(L, metatable); // hide metatable from Lua getmetatable()
lua_settable(L, metatable);
lua_pushliteral(L, "__index");
lua_pushvalue(L, methodtable);
@ -460,12 +467,16 @@ void LuaItemStack::Register(lua_State *L)
lua_pushcfunction(L, gc_object);
lua_settable(L, metatable);
lua_pushliteral(L, "__tostring");
lua_pushcfunction(L, mt_tostring);
lua_settable(L, metatable);
lua_pop(L, 1); // drop metatable
luaL_openlib(L, 0, methods, 0); // fill methodtable
lua_pop(L, 1); // drop methodtable
// Can be created from Lua (LuaItemStack(itemstack or itemstring or table or nil))
// Can be created from Lua (ItemStack(itemstack or itemstring or table or nil))
lua_register(L, className, create_object);
}

3
src/script/lua_api/l_item.h
View file

@ -34,6 +34,9 @@ private:
// garbage collector
static int gc_object(lua_State *L);
// __tostring metamethod
static int mt_tostring(lua_State *L);
// is_empty(self) -> true/false
static int l_is_empty(lua_State *L);