package acgtk

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package acgtk
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type 'a t =
  1. | List_zip of 'a list * 'a * 'a list
    (*

    This type aims to implement a zipper for lists. The context is the first parameter. It represents the list of the elements in reverse order that has been traversed to reach the focused element (the second parameter). The last element is the remaining elements of the list.

    *)
exception Empty_list
exception End_of_list
val init : 'a list -> 'a t

init l inits a focused list. It raises an exception Empty_list if l is empty, hence has no element to focus on.

val forward : 'a t -> 'a t

forward z returns a the new focused_list where the focuses element is the next one in the initial list. It raises End_of_list if no such element is available

val backward : 'a t -> 'a t

backward z returns a the new focused_list where the focuses element is the previous one in the initial list. It raises End_of_list if no such element is available

val fold : ('b -> ('a list * 'a * 'a list) -> 'b) -> 'b -> 'a t -> 'b

fold f a z returns f (... (f (f a z1) z2) ...) z_n where z_1=z and z_{i+1}=forward z_i and forward z_n would raise an exception End_of_list.