ocp-index 1.3.1 · OCaml Package

This module defines a generic data structure: Lazy tries based on lists

type ('a, 'b) t

Type of tries mapping from 'a list to 'b

val empty : ('a, 'b) t

val create : 
  ?children:('a * ('a, 'b) t) list Lazy.t ->
  ?value:'b ->
  unit ->
  ('a, 'b) t

Create a new trie with the given components

val mem : ('a, 'b) t -> 'a list -> bool

Returns true if there is a value associated with the given path

val find : ('a, 'b) t -> 'a list -> 'b

Returns the value associated with the given path.

raises [Not_found]

val find_all : ('a, 'b) t -> 'a list -> 'b list

Returns all values associated with the given path, most recent first.

val set : ('a, 'b) t -> 'a list -> 'b -> ('a, 'b) t

Associates a value with the given path, or replaces if there was already one

val set_lazy : ('a, 'b) t -> 'a list -> 'b Lazy.t -> ('a, 'b) t

The same but taking a lazy value

val add : ('a, 'b) t -> 'a list -> 'b -> ('a, 'b) t

Associates a value with the given path, keeping previous bindings

val add_lazy : ('a, 'b) t -> 'a list -> 'b Lazy.t -> ('a, 'b) t

The same but taking a lazy value

val unset : ('a, 'b) t -> 'a list -> ('a, 'b) t

Removes all associations to a given key from the trie. Warning: doesn't cleanup branches that don't point to anything anymore

val map_subtree : 
  ('a, 'b) t ->
  'a list ->
  (('a, 'b) t -> ('a, 'b) t) ->
  ('a, 'b) t

map_subtree tree path f applies f on value and children of the node found at path in tree, and bind the returned node back at that position in the tree

val iter : ('a list -> 'b -> unit) -> ('a, 'b) t -> unit

iters over all the bindings in the trie, top-down

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

folds over all bindings of the trie, bottom-up

val fold0 : ('acc -> 'a list -> 'b list -> 'acc) -> ('a, 'b) t -> 'acc -> 'acc

same as fold, but the list of bindings at a given path is given at once

val map : ('a list -> 'b -> 'c) -> ('a, 'b) t -> ('a, 'c) t

Maps over all bindings of the trie

val sub : ('a, 'b) t -> 'a list -> ('a, 'b) t

sub t p returns the sub-trie associated with the path p in the trie t. If p is not a valid path of t, it returns an empty trie.

val filter_keys : ('a -> bool) -> ('a, 'b) t -> ('a, 'b) t

filter f t returns t with all subtrees for which f key = false pruned

val graft : ('a, 'b) t -> 'a list -> ('a, 'b) t -> ('a, 'b) t

graft tree path subtree grafts the children of subtree in tree at path, replacing the whole subtree

val graft_lazy : ('a, 'b) t -> 'a list -> ('a, 'b) t Lazy.t -> ('a, 'b) t

Lazy version of graft

val merge : 
  ?values:('b list -> 'b list -> 'b list) ->
  ('a, 'b) t ->
  ('a, 'b) t ->
  ('a, 'b) t

Merges two tries, accepting an optional function to resolve value conflicts. The default function pushes right-hand values on top of left-hand ones

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

append tree (path, subtree) appends subtree in tree at path, merging with the previous subtree of tree. The interface allows for multiple appends with a simple List.fold_left

package ocp-index