Pausing is very straightforward with bottom up algorithms like GLR. The entire state of the parse is stored in an explicit stack data structure, as opposed to i

Pausing is very straightforward with bottom up algorithms like GLR. The entire state of the parse is stored in an explicit stack data structure, as opposed to implicitly in the program's call stack as with top-down algorithms. So resuming the parse is as simple as resuming the parse loop using a previously-stored stack.