static LuaObject EvalUnaryExpression(UnaryExpression Expression, LuaContext Context)
{
LuaObject obj = EvalExpression(Expression.Expression, Context)[0];
switch (Expression.Operation)
{
case UnaryOp.Invert:
return(-(obj.AsNumber()));
case UnaryOp.Length:
{
if (obj.Is(LuaType.table))
{
return(obj.AsTable().Count);
}
else
{
return(obj.AsString().Length);
}
}
case UnaryOp.Negate:
return(!(obj.AsBool()));
default:
throw new NotImplementedException();
}
}
LuaArguments rawlen(LuaArguments args)
{
LuaObject obj = args[0];
if (obj.IsString)
{
return(Return(obj.AsString().Length));
}
else if (obj.IsTable)
{
return(Return(obj.AsTable().Count));
}
else
{
throw new LuaException("invalid argument");
}
}
public static void rawset(LuaObject table, LuaObject key, LuaObject value)
{
if (table.IsTable)
{
var t = table.AsTable();
if (t.ContainsKey(key))
{
t[key] = value;
}
else
{
t.Add(key, value);
}
}
else
{
throw new LuaException("Invalid operation");
}
}
// This is all based on the Lua 5.2 manual
// http://www.lua.org/manual/5.2/manual.html#2.4
public static LuaObject rawget(LuaObject table, LuaObject index)
{
if (table.IsTable)
{
LuaObject obj;
if (table.AsTable().TryGetValue(index, out obj))
{
return(obj);
}
else
{
return(LuaObject.Nil);
}
}
else
{
throw new LuaException("Invalid operation");
}
}
internal static LuaObject len_event(LuaObject op)
{
if (op.IsString)
{
return(op.AsString().Length);
}
else
{
var handler = getMetamethod(op, "__len");
if (!handler.IsNil)
{
return(handler.Call(op)[0]);
}
else if (op.IsTable)
{
return(op.AsTable().Count);
}
else
{
throw new LuaException("Invalid op");
}
}
}
