public void Add(LuaValue key, LuaValue value)
{
CheckDisposed();
if (key.IsNil())
{
throw new ArgumentNullException("key");
}
Runtime.Push(this);
Runtime.Push(key);
LuaApi.lua_gettable(Runtime.LuaState, -2);
if (LuaApi.lua_type(Runtime.LuaState, -1) != LuaApi.LuaType.Nil)
{
// Slot is occupied.
LuaApi.lua_pop(Runtime.LuaState, 2);
throw new ArgumentException("Table already contains given key.", "key");
}
// Slot is unoccupied. Leave the nil there for now, we'll pop ALL the things at the end.
Runtime.Push(key);
Runtime.Push(value);
LuaApi.lua_settable(Runtime.LuaState, -4);
// Pop table and nil value.
LuaApi.lua_pop(Runtime.LuaState, 2);
}
public void Clear()
{
CheckDisposed();
Runtime.Push(this);
// Go over each key and remove it until the table is empty.
for (;;)
{
LuaApi.lua_pushnil(Runtime.LuaState);
if (LuaApi.lua_next(Runtime.LuaState, -2) == 0)
{
// Table is empty.
LuaApi.lua_pop(Runtime.LuaState, 1);
break;
}
// Replace the value with nil and set the key.
LuaApi.lua_pop(Runtime.LuaState, 1);
LuaApi.lua_pushnil(Runtime.LuaState);
LuaApi.lua_settable(Runtime.LuaState, -3);
// Next iteration will start from the next key by using a nil key again.
}
}
protected override LuaValue CopyReferenceImpl()
{
CheckDisposed();
// We need to take a new reference, so we will let Runtime.Wrap() build the copy.
Runtime.Push(this);
var copy = Runtime.Wrap(-1);
LuaApi.lua_pop(Runtime.LuaState, 1);
return(copy);
}
public bool MoveNext()
{
CheckDisposed();
// Fast-fail if we reached the end previously.
if (atEnd)
{
return(false);
}
var runtime = table.Runtime;
runtime.Push(table);
// Will push nil on first iteration, which is exactly what lua_next() expects.
runtime.Push(currentKey);
if (LuaApi.lua_next(runtime.LuaState, -2) == 0)
{
// At the end, so only the table is on the stack now.
atEnd = true;
LuaApi.lua_pop(runtime.LuaState, 1);
return(false);
}
var newValue = runtime.Wrap(-1);
var newKey = runtime.Wrap(-2);
current = new KeyValuePair <LuaValue, LuaValue>(newKey, newValue);
if (currentKey != null)
{
currentKey.Dispose();
}
currentKey = current.Key.CopyReference();
LuaApi.lua_pop(runtime.LuaState, 3);
return(true);
}
