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Simon Cruanes 2014-06-28 04:01:25 +02:00
commit eeca970d0b
10 changed files with 746 additions and 370 deletions
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7
README.md
View file

@ -60,6 +60,7 @@ structures comprise (some modules in `misc/`, some other in `core/`):
- `CCKTree`, an abstract lazy tree structure (similar to what `CCKlist` is to lists) - `CCKTree`, an abstract lazy tree structure (similar to what `CCKlist` is to lists)
- small modules (basic types, utilities): - small modules (basic types, utilities):
- `CCInt` - `CCInt`
- `CCString` (basic string operations)
- `CCPair` (cartesian products) - `CCPair` (cartesian products)
- `CCOpt` (options) - `CCOpt` (options)
- `CCFun` (function combinators) - `CCFun` (function combinators)
@ -70,6 +71,12 @@ structures comprise (some modules in `misc/`, some other in `core/`):
- `CCHash` (hashing combinators) - `CCHash` (hashing combinators)
- `CCError` (monadic error handling) - `CCError` (monadic error handling)
### String
In the module `Containers_string`:
- `Levenshtein`: edition distance between two strings
- `KMP`: Knuth-Morris-Pratt substring algorithm
### Misc ### Misc
- `PHashtbl`, a polymorphic hashtable (with open addressing) - `PHashtbl`, a polymorphic hashtable (with open addressing)

4
_oasis
View file

@ -47,13 +47,13 @@ Library "containers"
CCMultiSet, CCBV, CCPrint, CCPersistentHashtbl, CCError, CCMultiSet, CCBV, CCPrint, CCPersistentHashtbl, CCError,
CCHeap, CCList, CCOpt, CCPair, CCFun, CCHash, CCHeap, CCList, CCOpt, CCPair, CCFun, CCHash,
CCKList, CCInt, CCBool, CCArray, CCBatch, CCOrd, CCKList, CCInt, CCBool, CCArray, CCBatch, CCOrd,
CCRandom, CCLinq, CCKTree, CCTrie CCRandom, CCLinq, CCKTree, CCTrie, CCString
FindlibName: containers FindlibName: containers
Library "containers_string" Library "containers_string"
Path: string Path: string
Pack: true Pack: true
Modules: KMP, CCString, Levenshtein Modules: KMP, Levenshtein
FindlibName: string FindlibName: string
FindlibParent: containers FindlibParent: containers

76
core/CCArray.ml
View file

@ -57,6 +57,10 @@ module type S = sig
val iteri : (int -> 'a -> unit) -> 'a t -> unit val iteri : (int -> 'a -> unit) -> 'a t -> unit
val blit : 'a t -> int -> 'a t -> int -> int -> unit
(** [blit from i into j len] copies [len] elements from the first array
to the second. See {!Array.blit}. *)
val reverse_in_place : 'a t -> unit val reverse_in_place : 'a t -> unit
(** Reverse the array in place *) (** Reverse the array in place *)
@ -92,16 +96,16 @@ module type S = sig
(** {2 IO} *) (** {2 IO} *)
val pp: ?sep:string -> (Buffer.t -> 'a -> unit) val pp: ?sep:string -> (Buffer.t -> 'a -> unit) ->
-> Buffer.t -> 'a t -> unit Buffer.t -> 'a t -> unit
(** print an array of items with printing function *) (** print an array of items with printing function *)
val pp_i: ?sep:string -> (Buffer.t -> int -> 'a -> unit) val pp_i: ?sep:string -> (Buffer.t -> int -> 'a -> unit) ->
-> Buffer.t -> 'a t -> unit Buffer.t -> 'a t -> unit
(** print an array, giving the printing function both index and item *) (** print an array, giving the printing function both index and item *)
val print : ?sep:string -> (Format.formatter -> 'a -> unit) val print : ?sep:string -> (Format.formatter -> 'a -> unit) ->
-> Format.formatter -> 'a t -> unit Format.formatter -> 'a t -> unit
(** print an array of items with printing function *) (** print an array of items with printing function *)
end end
@ -112,13 +116,13 @@ Most of those functions that a range [(i,j)] with
let rec _foldi f acc a i j = let rec _foldi f acc a i j =
if i = j then acc else _foldi f (f acc i a.(i)) a (i+1) j if i = j then acc else _foldi f (f acc i a.(i)) a (i+1) j
let _reverse_in_place a i j = let _reverse_in_place a i ~len =
if i=j then () if len=0 then ()
else else
for k = i to (j-1)/2 do for k = 0 to (len-1)/2 do
let t = a.(k) in let t = a.(i+k) in
a.(k) <- a.(j-1-k); a.(i+k) <- a.(i+len-1-k);
a.(j-1-k) <- t; a.(i+len-1-k) <- t;
done done
let rec _equal eq a1 i1 j1 a2 i2 j2 = let rec _equal eq a1 i1 j1 a2 i2 j2 =
@ -135,9 +139,16 @@ let rec _compare cmp a1 i1 j1 a2 i2 j2 =
else else
let c = cmp a1.(i1) a2.(i2) in let c = cmp a1.(i1) a2.(i2) in
if c = 0 if c = 0
then _compare cmp a1 (i1+1) j1 a2 (i2+2) j2 then _compare cmp a1 (i1+1) j1 a2 (i2+1) j2
else c else c
(*$T
compare CCOrd.compare [| 1; 2; 3 |] [| 1; 2; 3 |] = 0
compare CCOrd.compare [| 1; 2; 3 |] [| 2; 2; 3 |] < 0
compare CCOrd.compare [| 1; 2; |] [| 1; 2; 3 |] < 0
compare CCOrd.compare [| 1; 2; 3 |] [| 1; 2; |] > 0
*)
let rec _find f a i j = let rec _find f a i j =
if i = j then None if i = j then None
else match f a.(i) with else match f a.(i) with
@ -150,11 +161,11 @@ let rec _for_all p a i j =
let rec _exists p a i j = let rec _exists p a i j =
i <> j && (p a.(i) || _exists p a (i+1) j) i <> j && (p a.(i) || _exists p a (i+1) j)
let rec _for_all2 p a1 a2 i1 i2 j1 = let rec _for_all2 p a1 a2 i1 i2 ~len =
i1 = j1 || (p a1.(i1) a2.(i2) && _for_all2 p a1 a2 (i1+1) (i2+1) j1) len=0 || (p a1.(i1) a2.(i2) && _for_all2 p a1 a2 (i1+1) (i2+1) ~len:(len-1))
let rec _exists2 p a1 a2 i1 i2 j1 = let rec _exists2 p a1 a2 i1 i2 ~len =
i1 <> j1 && (p a1.(i1) a2.(i2) || _exists2 p a1 a2 (i1+1) (i2+1) j1) len>0 && (p a1.(i1) a2.(i2) || _exists2 p a1 a2 (i1+1) (i2+1) ~len:(len-1))
(* shuffle a[i...j[ using the given int random generator (* shuffle a[i...j[ using the given int random generator
See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle *) See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle *)
@ -228,6 +239,8 @@ let iter = Array.iter
let iteri = Array.iteri let iteri = Array.iteri
let blit = Array.blit
let reverse_in_place a = let reverse_in_place a =
_reverse_in_place a 0 (Array.length a) _reverse_in_place a 0 (Array.length a)
@ -303,12 +316,10 @@ let exists p a = _exists p a 0 (Array.length a)
let for_all2 p a b = let for_all2 p a b =
Array.length a = Array.length b Array.length a = Array.length b
&& &&
_for_all2 p a b 0 0 (Array.length a) _for_all2 p a b 0 0 ~len:(Array.length a)
let exists2 p a b = let exists2 p a b =
Array.length a = Array.length b _exists2 p a b 0 0 ~len:(min (Array.length a) (Array.length b))
&&
_exists2 p a b 0 0 (Array.length a)
let (--) i j = let (--) i j =
if i<=j if i<=j
@ -374,11 +385,13 @@ module Sub = struct
} }
let make arr i ~len = let make arr i ~len =
if i+len > Array.length arr then invalid_arg "Array.Sub.make"; if i<0||i+len > Array.length arr then invalid_arg "Array.Sub.make";
{ arr; i; j=i+len; } { arr; i; j=i+len; }
let of_slice (arr,i,len) = make arr i ~len let of_slice (arr,i,len) = make arr i ~len
let to_slice a = a.arr, a.i, a.j-a.i
let full arr = { arr; i=0; j=Array.length arr; } let full arr = { arr; i=0; j=Array.length arr; }
let underlying a = a.arr let underlying a = a.arr
@ -419,7 +432,16 @@ module Sub = struct
let iteri f a = let iteri f a =
for k=0 to length a-1 do f k a.arr.(a.i + k) done for k=0 to length a-1 do f k a.arr.(a.i + k) done
let reverse_in_place a = _reverse_in_place a.arr a.i a.j let blit a i b j len =
if i+len>length a || j+len>length b then invalid_arg "Array.Sub.blit";
Array.blit a.arr (a.i+i) b.arr (b.i+j) len
let reverse_in_place a = _reverse_in_place a.arr a.i ~len:(length a)
(*$T
let a = 1--6 in let s = Sub.make a 2 ~len:3 in \
Sub.reverse_in_place s; a = [| 1; 2; 5; 4; 3; 6 |]
*)
let find f a = _find f a.arr a.i a.j let find f a = _find f a.arr a.i a.j
@ -428,10 +450,14 @@ module Sub = struct
let exists p a = _exists p a.arr a.i a.j let exists p a = _exists p a.arr a.i a.j
let for_all2 p a b = let for_all2 p a b =
length a = length b && _for_all2 p a.arr b.arr a.i b.i b.j length a = length b && _for_all2 p a.arr b.arr a.i b.i ~len:(length a)
let exists2 p a b = let exists2 p a b =
length a = length b && _exists2 p a.arr b.arr a.i b.i a.j _exists2 p a.arr b.arr a.i b.i ~len:(min (length a) (length b))
(*$T
Sub.exists2 (=) (Sub.make [| 1;2;3;4 |] 1 ~len:2) (Sub.make [| 0;1;3;4 |] 1 ~len:3)
*)
let shuffle a = let shuffle a =
_shuffle Random.int a.arr a.i a.j _shuffle Random.int a.arr a.i a.j

20
core/CCArray.mli
View file

@ -59,6 +59,10 @@ module type S = sig
val iteri : (int -> 'a -> unit) -> 'a t -> unit val iteri : (int -> 'a -> unit) -> 'a t -> unit
val blit : 'a t -> int -> 'a t -> int -> int -> unit
(** [blit from i into j len] copies [len] elements from the first array
to the second. See {!Array.blit}. *)
val reverse_in_place : 'a t -> unit val reverse_in_place : 'a t -> unit
(** Reverse the array in place *) (** Reverse the array in place *)
@ -94,16 +98,16 @@ module type S = sig
(** {2 IO} *) (** {2 IO} *)
val pp: ?sep:string -> (Buffer.t -> 'a -> unit) val pp: ?sep:string -> (Buffer.t -> 'a -> unit) ->
-> Buffer.t -> 'a t -> unit Buffer.t -> 'a t -> unit
(** print an array of items with printing function *) (** print an array of items with printing function *)
val pp_i: ?sep:string -> (Buffer.t -> int -> 'a -> unit) val pp_i: ?sep:string -> (Buffer.t -> int -> 'a -> unit) ->
-> Buffer.t -> 'a t -> unit Buffer.t -> 'a t -> unit
(** print an array, giving the printing function both index and item *) (** print an array, giving the printing function both index and item *)
val print : ?sep:string -> (Format.formatter -> 'a -> unit) val print : ?sep:string -> (Format.formatter -> 'a -> unit) ->
-> Format.formatter -> 'a t -> unit Format.formatter -> 'a t -> unit
(** print an array of items with printing function *) (** print an array of items with printing function *)
end end
@ -159,6 +163,10 @@ module Sub : sig
[i] the offset in [arr], and [len] the number of elements of the slice. [i] the offset in [arr], and [len] the number of elements of the slice.
@raise Invalid_argument if the slice isn't valid (See {!make}) *) @raise Invalid_argument if the slice isn't valid (See {!make}) *)
val to_slice : 'a t -> ('a array * int * int)
(** Convert into a triple [(arr, i, len)] where [len] is the length of
the subarray of [arr] starting at offset [i] *)
val full : 'a array -> 'a t val full : 'a array -> 'a t
(** Slice that covers the full array *) (** Slice that covers the full array *)

290
core/CCPersistentHashtbl.ml
View file

@ -26,6 +26,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(** {1 Persistent hash-table on top of OCaml's hashtables} *) (** {1 Persistent hash-table on top of OCaml's hashtables} *)
type 'a sequence = ('a -> unit) -> unit type 'a sequence = ('a -> unit) -> unit
type 'a printer = Buffer.t -> 'a -> unit
type 'a formatter = Format.formatter -> 'a -> unit
type 'a equal = 'a -> 'a -> bool
module type HashedType = sig module type HashedType = sig
type t type t
@ -40,52 +43,92 @@ module type S = sig
type 'a t type 'a t
val empty : unit -> 'a t val empty : unit -> 'a t
(** Empty table. The table will be allocated at the first binding *) (** Empty table. The table will be allocated at the first binding *)
val create : int -> 'a t val create : int -> 'a t
(** Create a new hashtable *) (** Create a new hashtable, with the given initial capacity *)
val is_empty : 'a t -> bool val is_empty : 'a t -> bool
(** Is the table empty? *) (** Is the table empty? *)
val find : 'a t -> key -> 'a val find : 'a t -> key -> 'a
(** Find the value for this key, or raise Not_found *) (** Find the value for this key, or fails
@raise Not_found if the key is not present in the table *)
val get_exn : key -> 'a t -> 'a
(** Synonym to {!find} with flipped arguments *)
val get : key -> 'a t -> 'a option
(** Safe version of !{get_exn} *)
val mem : 'a t -> key -> bool val mem : 'a t -> key -> bool
(** Is the key bound? *) (** Is the key bound? *)
val length : 'a t -> int val length : _ t -> int
(** Number of bindings *) (** Number of bindings *)
val replace : 'a t -> key -> 'a -> 'a t val replace : 'a t -> key -> 'a -> 'a t
(** Add the binding to the table, returning a new table. This erases (** Add the binding to the table, returning a new table. This erases
the current binding for [key], if any. *) the current binding for [key], if any. *)
val update : 'a t -> key -> ('a option -> 'a option) -> 'a t
(** [update tbl key f] calls [f None] if [key] doesn't belong in [tbl],
[f (Some v)] if [key -> v] otherwise; If [f] returns [None] then
[key] is removed, else it returns [Some v'] and [key -> v'] is added. *)
val remove : 'a t -> key -> 'a t val remove : 'a t -> key -> 'a t
(** Remove the key *) (** Remove the key *)
val copy : 'a t -> 'a t val copy : 'a t -> 'a t
(** Fresh copy of the table; the underlying structure is not shared (** Fresh copy of the table; the underlying structure is not shared
anymore, so using both tables alternatively will be efficient *) anymore, so using both tables alternatively will be efficient *)
val merge : (key -> 'a option -> 'a option -> 'a option) -> 'a t -> 'a t -> 'a t val merge : (key -> 'a option -> 'a option -> 'a option) ->
(** Merge two tables together into a new table *) 'a t -> 'a t -> 'a t
(** Merge two tables together into a new table. The function's argument
correspond to values associated with the key (if present); if the
function returns [None] the key will not appear in the result. *)
val iter : 'a t -> (key -> 'a -> unit) -> unit val iter : 'a t -> (key -> 'a -> unit) -> unit
(** Iterate over bindings *) (** Iterate over bindings *)
val fold : ('b -> key -> 'a -> 'b) -> 'b -> 'a t -> 'b val fold : ('b -> key -> 'a -> 'b) -> 'b -> 'a t -> 'b
(** Fold over bindings *) (** Fold over bindings *)
val of_seq : ?init:'a t -> (key * 'a) sequence -> 'a t val map : (key -> 'a -> 'b) -> 'a t -> 'b t
(** Add (replace) bindings from the sequence to the table *) (** Map all values *)
val of_list : ?init:'a t -> (key * 'a) list -> 'a t val filter : (key -> 'a -> bool) -> 'a t -> 'a t
val filter_map : (key -> 'a -> 'b option) -> 'a t -> 'b t
val for_all : (key -> 'a -> bool) -> 'a t -> bool
val exists : (key -> 'a -> bool) -> 'a t -> bool
(** {3 Conversions} *)
val of_seq : (key * 'a) sequence -> 'a t
(** Add (replace) bindings from the sequence to the table *)
val of_list : (key * 'a) list -> 'a t
val add_seq : 'a t -> (key * 'a) sequence -> 'a t
val add_list : 'a t -> (key * 'a) list -> 'a t
val to_seq : 'a t -> (key * 'a) sequence val to_seq : 'a t -> (key * 'a) sequence
(** Sequence of the bindings of the table *) (** Sequence of the bindings of the table *)
val to_list : 'a t -> (key * 'a) list val to_list : 'a t -> (key * 'a) list
(** {3 Misc} *)
val equal : 'a equal -> 'a t equal
val pp : key printer -> 'a printer -> 'a t printer
val print : key formatter -> 'a formatter -> 'a t formatter
end end
(** {2 Implementation} *) (** {2 Implementation} *)
@ -107,64 +150,55 @@ module Make(H : HashedType) : S with type key = H.t = struct
let empty () = create 11 let empty () = create 11
(** Reroot: modify the zipper so that the current node is a proper (* pass continuation to get a tailrec rerooting *)
hashtable, and return the hashtable *) let rec _reroot t k = match !t with
let reroot t = | Table tbl -> k tbl (* done *)
(* pass continuation to get a tailrec rerooting *) | Add (key, v, t') ->
let rec reroot t k = match !t with _reroot t'
| Table tbl -> k tbl (* done *) (fun tbl ->
| Add (key, v, t') -> t' := Remove (key, t);
reroot t' Table.add tbl key v;
(fun tbl -> t := Table tbl;
t' := Remove (key, t); k tbl)
Table.add tbl key v; | Replace (key, v, t') ->
t := Table tbl; _reroot t'
k tbl) (fun tbl ->
| Replace (key, v, t') -> let v' = Table.find tbl key in
reroot t' t' := Replace (key, v', t);
(fun tbl -> t := Table tbl;
let v' = Table.find tbl key in Table.replace tbl key v;
t' := Replace (key, v', t); k tbl)
t := Table tbl; | Remove (key, t') ->
Table.replace tbl key v; _reroot t'
k tbl) (fun tbl ->
| Remove (key, t') -> let v = Table.find tbl key in
reroot t' t' := Add (key, v, t);
(fun tbl -> t := Table tbl;
let v = Table.find tbl key in Table.remove tbl key;
t' := Add (key, v, t); k tbl)
t := Table tbl;
Table.remove tbl key; (* Reroot: modify the zipper so that the current node is a proper
k tbl) hashtable, and return the hashtable *)
in let reroot t = match !t with
match !t with
| Table tbl -> tbl | Table tbl -> tbl
| _ -> reroot t (fun x -> x) | _ -> _reroot t (fun x -> x)
let is_empty t = let is_empty t = Table.length (reroot t) = 0
match !t with
| Table tbl -> Table.length tbl = 0
| _ -> Table.length (reroot t) = 0
let find t k = let find t k = Table.find (reroot t) k
match !t with
| Table tbl -> Table.find tbl k
| _ -> Table.find (reroot t) k
let mem t k = let get_exn k t = find t k
match !t with
| Table tbl -> Table.mem tbl k
| _ -> Table.mem (reroot t) k
let length t = let get k t =
match !t with try Some (find t k)
| Table tbl -> Table.length tbl with Not_found -> None
| _ -> Table.length (reroot t)
let mem t k = Table.mem (reroot t) k
let length t = Table.length (reroot t)
let replace t k v = let replace t k v =
let tbl = match !t with let tbl = reroot t in
| Table tbl -> tbl
| _ -> reroot t in
(* create the new hashtable *) (* create the new hashtable *)
let t' = ref (Table tbl) in let t' = ref (Table tbl) in
(* update [t] to point to the new hashtable *) (* update [t] to point to the new hashtable *)
@ -172,15 +206,14 @@ module Make(H : HashedType) : S with type key = H.t = struct
let v' = Table.find tbl k in let v' = Table.find tbl k in
t := Replace (k, v', t') t := Replace (k, v', t')
with Not_found -> with Not_found ->
t := Remove (k, t')); t := Remove (k, t')
);
(* modify the underlying hashtable *) (* modify the underlying hashtable *)
Table.replace tbl k v; Table.replace tbl k v;
t' t'
let remove t k = let remove t k =
let tbl = match !t with let tbl = reroot t in
| Table tbl -> tbl
| _ -> reroot t in
try try
let v' = Table.find tbl k in let v' = Table.find tbl k in
(* value present, make a new hashtable without this value *) (* value present, make a new hashtable without this value *)
@ -192,26 +225,63 @@ module Make(H : HashedType) : S with type key = H.t = struct
(* not member, nothing to do *) (* not member, nothing to do *)
t t
let update t k f =
let v = get k t in
match v, f v with
| None, None -> t (* no change *)
| Some _, None -> remove t k
| _, Some v' -> replace t k v'
let copy t = let copy t =
let tbl = match !t with let tbl = reroot t in
| Table tbl -> tbl
| _ -> reroot t in
(* no one will point to the new [t] *) (* no one will point to the new [t] *)
let t = ref (Table (Table.copy tbl)) in let t = ref (Table (Table.copy tbl)) in
t t
let iter t f = let iter t f =
let tbl = match !t with let tbl = reroot t in
| Table tbl -> tbl
| _ -> reroot t in
Table.iter f tbl Table.iter f tbl
let fold f acc t = let fold f acc t =
let tbl = match !t with let tbl = reroot t in
| Table tbl -> tbl
| _ -> reroot t in
Table.fold (fun k v acc -> f acc k v) tbl acc Table.fold (fun k v acc -> f acc k v) tbl acc
let map f t =
let tbl = reroot t in
let res = Table.create (Table.length tbl) in
Table.iter (fun k v -> Table.replace res k (f k v)) tbl;
ref (Table res)
let filter p t =
let tbl = reroot t in
let res = Table.create (Table.length tbl) in
Table.iter (fun k v -> if p k v then Table.replace res k v) tbl;
ref (Table res)
let filter_map f t =
let tbl = reroot t in
let res = Table.create (Table.length tbl) in
Table.iter
(fun k v -> match f k v with
| None -> ()
| Some v' -> Table.replace res k v'
) tbl;
ref (Table res)
exception ExitPTbl
let for_all p t =
try
iter t (fun k v -> if not (p k v) then raise ExitPTbl);
true
with ExitPTbl -> false
let exists p t =
try
iter t (fun k v -> if p k v then raise ExitPTbl);
false
with ExitPTbl -> true
let merge f t1 t2 = let merge f t1 t2 =
let tbl = Table.create (max (length t1) (length t2)) in let tbl = Table.create (max (length t1) (length t2)) in
iter t1 iter t1
@ -227,15 +297,17 @@ module Make(H : HashedType) : S with type key = H.t = struct
| Some v' -> Table.replace tbl k v2); | Some v' -> Table.replace tbl k v2);
ref (Table tbl) ref (Table tbl)
let of_seq ?init seq = let add_seq init seq =
let tbl = match init with let tbl = ref init in
| None -> Table.create 5 seq (fun (k,v) -> tbl := replace !tbl k v);
| Some t -> Table.copy (reroot t) in !tbl
seq (fun (k,v) -> Table.replace tbl k v);
ref (Table tbl)
let of_list ?init l = let of_seq seq = add_seq (empty ()) seq
of_seq ?init (fun k -> List.iter k l)
let add_list init l =
add_seq init (fun k -> List.iter k l)
let of_list l = add_list (empty ()) l
let to_list t = let to_list t =
let tbl = reroot t in let tbl = reroot t in
@ -244,10 +316,36 @@ module Make(H : HashedType) : S with type key = H.t = struct
let to_seq t = let to_seq t =
fun k -> fun k ->
let tbl = match !t with let tbl = reroot t in
| Table tbl -> tbl
| _ -> reroot t
in
Table.iter (fun x y -> k (x,y)) tbl Table.iter (fun x y -> k (x,y)) tbl
let equal eq t1 t2 =
length t1 = length t2
&&
for_all
(fun k v -> match get k t2 with
| None -> false
| Some v' -> eq v v'
) t1
let pp pp_k pp_v buf t =
Buffer.add_string buf "{";
let first = ref true in
iter t
(fun k v ->
if !first then first:=false else Buffer.add_string buf ", ";
Printf.bprintf buf "%a -> %a" pp_k k pp_v v
);
Buffer.add_string buf "}"
let print pp_k pp_v fmt t =
Format.pp_print_string fmt "{";
let first = ref true in
iter t
(fun k v ->
if !first then first:=false else Format.pp_print_string fmt ", ";
Format.fprintf fmt "%a -> %a" pp_k k pp_v v
);
Format.pp_print_string fmt "}"
end end

92
core/CCPersistentHashtbl.mli
View file

@ -23,9 +23,19 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*) *)
(** {1 Persistent hash-table on top of OCaml's hashtables} *) (** {1 Persistent hash-table on top of OCaml's hashtables}
Almost as efficient as the regular Hashtbl type, but with a persistent
interface (rewinding changes to get back in the past history). This is
mostly useful for backtracking-like uses, or forward uses (never using
old values).
This module is not thread-safe. *)
type 'a sequence = ('a -> unit) -> unit type 'a sequence = ('a -> unit) -> unit
type 'a printer = Buffer.t -> 'a -> unit
type 'a formatter = Format.formatter -> 'a -> unit
type 'a equal = 'a -> 'a -> bool
module type HashedType = sig module type HashedType = sig
type t type t
@ -40,52 +50,92 @@ module type S = sig
type 'a t type 'a t
val empty : unit -> 'a t val empty : unit -> 'a t
(** Empty table. The table will be allocated at the first binding *) (** Empty table. The table will be allocated at the first binding *)
val create : int -> 'a t val create : int -> 'a t
(** Create a new hashtable *) (** Create a new hashtable, with the given initial capacity *)
val is_empty : 'a t -> bool val is_empty : 'a t -> bool
(** Is the table empty? *) (** Is the table empty? *)
val find : 'a t -> key -> 'a val find : 'a t -> key -> 'a
(** Find the value for this key, or raise Not_found *) (** Find the value for this key, or fails
@raise Not_found if the key is not present in the table *)
val get_exn : key -> 'a t -> 'a
(** Synonym to {!find} with flipped arguments *)
val get : key -> 'a t -> 'a option
(** Safe version of !{get_exn} *)
val mem : 'a t -> key -> bool val mem : 'a t -> key -> bool
(** Is the key bound? *) (** Is the key bound? *)
val length : 'a t -> int val length : _ t -> int
(** Number of bindings *) (** Number of bindings *)
val replace : 'a t -> key -> 'a -> 'a t val replace : 'a t -> key -> 'a -> 'a t
(** Add the binding to the table, returning a new table. This erases (** Add the binding to the table, returning a new table. This erases
the current binding for [key], if any. *) the current binding for [key], if any. *)
val update : 'a t -> key -> ('a option -> 'a option) -> 'a t
(** [update tbl key f] calls [f None] if [key] doesn't belong in [tbl],
[f (Some v)] if [key -> v] otherwise; If [f] returns [None] then
[key] is removed, else it returns [Some v'] and [key -> v'] is added. *)
val remove : 'a t -> key -> 'a t val remove : 'a t -> key -> 'a t
(** Remove the key *) (** Remove the key *)
val copy : 'a t -> 'a t val copy : 'a t -> 'a t
(** Fresh copy of the table; the underlying structure is not shared (** Fresh copy of the table; the underlying structure is not shared
anymore, so using both tables alternatively will be efficient *) anymore, so using both tables alternatively will be efficient *)
val merge : (key -> 'a option -> 'a option -> 'a option) -> 'a t -> 'a t -> 'a t val merge : (key -> 'a option -> 'a option -> 'a option) ->
(** Merge two tables together into a new table *) 'a t -> 'a t -> 'a t
(** Merge two tables together into a new table. The function's argument
correspond to values associated with the key (if present); if the
function returns [None] the key will not appear in the result. *)
val iter : 'a t -> (key -> 'a -> unit) -> unit val iter : 'a t -> (key -> 'a -> unit) -> unit
(** Iterate over bindings *) (** Iterate over bindings *)
val fold : ('b -> key -> 'a -> 'b) -> 'b -> 'a t -> 'b val fold : ('b -> key -> 'a -> 'b) -> 'b -> 'a t -> 'b
(** Fold over bindings *) (** Fold over bindings *)
val of_seq : ?init:'a t -> (key * 'a) sequence -> 'a t val map : (key -> 'a -> 'b) -> 'a t -> 'b t
(** Add (replace) bindings from the sequence to the table *) (** Map all values *)
val of_list : ?init:'a t -> (key * 'a) list -> 'a t val filter : (key -> 'a -> bool) -> 'a t -> 'a t
val filter_map : (key -> 'a -> 'b option) -> 'a t -> 'b t
val for_all : (key -> 'a -> bool) -> 'a t -> bool
val exists : (key -> 'a -> bool) -> 'a t -> bool
(** {3 Conversions} *)
val of_seq : (key * 'a) sequence -> 'a t
(** Add (replace) bindings from the sequence to the table *)
val of_list : (key * 'a) list -> 'a t
val add_seq : 'a t -> (key * 'a) sequence -> 'a t
val add_list : 'a t -> (key * 'a) list -> 'a t
val to_seq : 'a t -> (key * 'a) sequence val to_seq : 'a t -> (key * 'a) sequence
(** Sequence of the bindings of the table *) (** Sequence of the bindings of the table *)
val to_list : 'a t -> (key * 'a) list val to_list : 'a t -> (key * 'a) list
(** {3 Misc} *)
val equal : 'a equal -> 'a t equal
val pp : key printer -> 'a printer -> 'a t printer
val print : key formatter -> 'a formatter -> 'a t formatter
end end
(** {2 Implementation} *) (** {2 Implementation} *)

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@ -0,0 +1,260 @@
(*
copyright (c) 2013-2014, simon cruanes
all rights reserved.
redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer. redistributions in binary
form must reproduce the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials provided with
the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*)
(** {1 Basic String Utils} *)
type 'a gen = unit -> 'a option
type 'a sequence = ('a -> unit) -> unit
type 'a klist = unit -> [`Nil | `Cons of 'a * 'a klist]
module type S = sig
type t
val length : t -> int
val blit : t -> int -> t -> int -> int -> unit
(** See {!String.blit} *)
(** {2 Conversions} *)
val to_gen : t -> char gen
val to_seq : t -> char sequence
val to_klist : t -> char klist
val pp : Buffer.t -> t -> unit
end
type t = string
let equal a b = a=b
let compare = String.compare
let hash s = Hashtbl.hash s
let length = String.length
let _is_sub ~sub i s j ~len =
let rec check k =
if k = len
then true
else sub.[i + k] = s.[j+k] && check (k+1)
in
j+len <= String.length s && check 0
let is_sub ~sub i s j ~len =
if i+len > String.length sub then invalid_arg "String.is_sub";
_is_sub ~sub i s j ~len
module Split = struct
type split_state =
| SplitStop
| SplitAt of int (* previous *)
(* [by_j... prefix of s_i...] ? *)
let rec _is_prefix ~by s i j =
j = String.length by
||
( i < String.length s &&
s.[i] = by.[j] &&
_is_prefix ~by s (i+1) (j+1)
)
let rec _split ~by s state = match state with
| SplitStop -> None
| SplitAt prev -> _split_search ~by s prev prev
and _split_search ~by s prev i =
if i >= String.length s
then Some (SplitStop, prev, String.length s - prev)
else if _is_prefix ~by s i 0
then Some (SplitAt (i+String.length by), prev, i-prev)
else _split_search ~by s prev (i+1)
let _tuple3 x y z = x,y,z
let _mkgen ~by s k =
let state = ref (SplitAt 0) in
fun () ->
match _split ~by s !state with
| None -> None
| Some (state', i, len) ->
state := state';
Some (k s i len)
let gen ~by s = _mkgen ~by s _tuple3
let gen_cpy ~by s = _mkgen ~by s String.sub
let _mklist ~by s k =
let rec build acc state = match _split ~by s state with
| None -> List.rev acc
| Some (state', i, len) ->
build (k s i len ::acc) state'
in
build [] (SplitAt 0)
let list_ ~by s = _mklist ~by s _tuple3
let list_cpy ~by s = _mklist ~by s String.sub
let _mkklist ~by s k =
let rec make state () = match _split ~by s state with
| None -> `Nil
| Some (state', i, len) ->
`Cons (k s i len , make state')
in make (SplitAt 0)
let klist ~by s = _mkklist ~by s _tuple3
let klist_cpy ~by s = _mkklist ~by s String.sub
let _mkseq ~by s f k =
let rec aux state = match _split ~by s state with
| None -> ()
| Some (state', i, len) -> k (f s i len); aux state'
in aux (SplitAt 0)
let seq ~by s = _mkseq ~by s _tuple3
let seq_cpy ~by s = _mkseq ~by s String.sub
end
(* note: inefficient *)
let find ?(start=0) ~sub s =
let n = String.length sub in
let i = ref start in
try
while !i + n < String.length s do
if _is_sub ~sub 0 s !i ~len:n then raise Exit;
incr i
done;
-1
with Exit ->
!i
let repeat s n =
assert (n>=0);
let len = String.length s in
assert(len > 0);
let buf = String.create (len * n) in
for i = 0 to n-1 do
String.blit s 0 buf (i * len) len;
done;
buf
let prefix ~pre s =
String.length pre <= String.length s &&
(let i = ref 0 in
while !i < String.length pre && s.[!i] = pre.[!i] do incr i done;
!i = String.length pre)
let blit = String.blit
let _to_gen s i0 len =
let i = ref i0 in
fun () ->
if !i = i0+len then None
else (
let c = String.unsafe_get s !i in
incr i;
Some c
)
let to_gen s = _to_gen s 0 (String.length s)
let of_gen g =
let b = Buffer.create 32 in
let rec aux () = match g () with
| None -> Buffer.contents b
| Some c -> Buffer.add_char b c; aux ()
in aux ()
let to_seq s k = String.iter k s
let of_seq seq =
let b= Buffer.create 32 in
seq (Buffer.add_char b);
Buffer.contents b
let rec _to_klist s i len () =
if len=0 then `Nil
else `Cons (s.[i], _to_klist s (i+1)(len-1))
let of_klist l =
let rec aux acc n l = match l() with
| `Nil ->
let s = String.create n in
let acc = ref acc in
for i=n-1 downto 0 do
s.[i] <- List.hd !acc;
acc := List.tl !acc
done;
s
| `Cons (x,l') -> aux (x::acc) (n+1) l'
in aux [] 0 l
let to_klist s = _to_klist s 0 (String.length s)
let pp buf s =
Buffer.add_char buf '"';
Buffer.add_string buf s;
Buffer.add_char buf '"'
module Sub = struct
type t = string * int * int
let make s i ~len =
if i<0||len<0||i+len > String.length s then invalid_arg "CCString.Sub.make";
s,i,len
let full s = s, 0, String.length s
let copy (s,i,len) = String.sub s i len
let underlying (s,_,_) = s
let sub (s,i,len) i' len' =
if i+i' + len' > i+len then invalid_arg "CCString.Sub.sub";
(s, i+i',len')
let length (_,_,l) = l
let blit (a1,i1,len1) o1 (a2,i2,len2) o2 len =
if o1+len>len1 || o2+len>len2 then invalid_arg "CCString.Sub.blit";
String.blit a1 (i1+o1) a2 (i2+o2) len
let to_gen (s,i,len) = _to_gen s i len
let to_seq (s,i,len) k =
for i=i to i+len-1 do k s.[i] done
let to_klist (s,i,len) = _to_klist s i len
let pp buf (s,i,len) =
Buffer.add_char buf '"';
Buffer.add_substring buf s i len;
Buffer.add_char buf '"'
end

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@ -0,0 +1,147 @@
(*
copyright (c) 2013-2014, simon cruanes
all rights reserved.
redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer. redistributions in binary
form must reproduce the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials provided with
the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*)
(** {1 Basic String Utils}
Consider using {!Containers_string.KMP} for pattern search, or Regex
libraries. *)
type 'a gen = unit -> 'a option
type 'a sequence = ('a -> unit) -> unit
type 'a klist = unit -> [`Nil | `Cons of 'a * 'a klist]
(** {2 Common Signature} *)
module type S = sig
type t
val length : t -> int
val blit : t -> int -> t -> int -> int -> unit
(** See {!String.blit} *)
(** {2 Conversions} *)
val to_gen : t -> char gen
val to_seq : t -> char sequence
val to_klist : t -> char klist
val pp : Buffer.t -> t -> unit
end
(** {2 Strings} *)
type t = string
val equal : t -> t -> bool
val compare : t -> t -> int
val hash : t -> int
val of_gen : char gen -> t
val of_seq : char sequence -> t
val of_klist : char klist -> t
val find : ?start:int -> sub:t -> t -> int
(** Find [sub] in the string, returns its first index or -1.
Should only be used with very small [sub] *)
val is_sub : sub:t -> int -> t -> int -> len:int -> bool
(** [is_sub ~sub i s j ~len] returns [true] iff the substring of
[sub] starting at position [i] and of length [len],
is a substring of [s] starting at position [j] *)
val repeat : t -> int -> t
(** The same string, repeated n times *)
val prefix : pre:t -> t -> bool
(** [str_prefix ~pre s] returns [true] iff [pre] is a prefix of [s] *)
include S with type t := t
(** {2 Splitting} *)
module Split : sig
val list_ : by:t -> t -> (t*int*int) list
(** split the given string along the given separator [by]. Should only
be used with very small separators, otherwise
use {!Containers_string.KMP}.
@return a list of (index,length) of substrings of [s] that are
separated by [by]. {!String.sub} can then be used to actually extract
the slice.
@raise Failure if [by = ""] *)
val gen : by:t -> t -> (t*int*int) gen
val seq : by:t -> t -> (t*int*int) sequence
val klist : by:t -> t -> (t*int*int) klist
(** {6 Copying functions}
Those split functions actually copy the substrings, which can be
more convenient but less efficient in general *)
val list_cpy : by:t -> t -> t list
(*$T
Split.list_cpy ~by:"," "aa,bb,cc" = ["aa"; "bb"; "cc"]
Split.list_cpy ~by:"--" "a--b----c--" = ["a"; "b"; ""; "c"; ""]
Split.list_cpy ~by:" " "hello world aie" = ["hello"; ""; "world"; "aie"]
*)
val gen_cpy : by:t -> t -> t gen
val seq_cpy : by:t -> t -> t sequence
val klist_cpy : by:t -> t -> t klist
end
(** {2 Slices} A contiguous part of a string *)
module Sub : sig
type t = string * int * int
(** A string, an offset, and the length of the slice *)
val make : string -> int -> len:int -> t
val full : string -> t
(** Full string *)
val copy : t -> string
(** Make a copy of the substring *)
val underlying : t -> string
val sub : t -> int -> int -> t
(** Sub-slice *)
include S with type t := t
end

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@ -1,150 +0,0 @@
(*
copyright (c) 2013-2014, simon cruanes
all rights reserved.
redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer. redistributions in binary
form must reproduce the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials provided with
the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*)
(** {1 Basic String Utils} *)
type t = string
let equal a b = a=b
let compare = String.compare
let hash s = Hashtbl.hash s
type 'a gen = unit -> 'a option
type 'a sequence = ('a -> unit) -> unit
let is_sub ~sub i s j =
let rec check k =
if i + k = String.length sub
then true
else sub.[i + k] = s.[j+k] && check (k+1)
in
check 0
(* note: quite inefficient if [by] is long *)
let split_gen ~by s =
let len_by = String.length by in
assert (len_by > 0);
let n = String.length s in
let prev = ref 0 in
let stop = ref false in
let rec search i =
if !stop then None
else if i >= n
then (
stop := true;
Some (String.sub s !prev (n- !prev)) (* done *)
)
else if is_prefix i 0
then (
let p = !prev in
prev := i+len_by;
Some (String.sub s p (i-p))
)
else search (i+1)
and is_prefix i j =
if j = len_by
then true
else if i = n
then false
else s.[i] = by.[j] && is_prefix (i+1) (j+1)
in
fun () ->
search !prev
let split_seq ~by s k =
let rec aux g = match g () with
| None -> ()
| Some x -> k x; aux g
in aux (split_gen ~by s)
let split ~by s =
let rec aux g acc = match g () with
| None -> List.rev acc
| Some x -> aux g (x::acc)
in aux (split_gen ~by s) []
(*$T
split ~by:"," "aa,bb,cc" = ["aa"; "bb"; "cc"]
split ~by:"--" "a--b----c--" = ["a"; "b"; ""; "c"; ""]
*)
(* note: inefficient *)
let find ?(start=0) ~sub s =
let n = String.length sub in
let i = ref start in
try
while !i + n < String.length s do
if is_sub ~sub 0 s !i then raise Exit;
incr i
done;
-1
with Exit ->
!i
let repeat s n =
assert (n>=0);
let len = String.length s in
assert(len > 0);
let buf = String.create (len * n) in
for i = 0 to n-1 do
String.blit s 0 buf (i * len) len;
done;
buf
let prefix ~pre s =
String.length pre <= String.length s &&
(let i = ref 0 in
while !i < String.length pre && s.[!i] = pre.[!i] do incr i done;
!i = String.length pre)
let to_gen s =
let i = ref 0 in
fun () ->
if !i = String.length s then None
else (
let c = String.unsafe_get s !i in
incr i;
Some c
)
let of_gen g =
let b = Buffer.create 32 in
let rec aux () = match g () with
| None -> Buffer.contents b
| Some c -> Buffer.add_char b c; aux ()
in aux ()
let to_seq s k = String.iter k s
let of_seq seq =
let b= Buffer.create 32 in
seq (Buffer.add_char b);
Buffer.contents b
let pp = Buffer.add_string

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@ -1,70 +0,0 @@
(*
copyright (c) 2013-2014, simon cruanes
all rights reserved.
redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer. redistributions in binary
form must reproduce the above copyright notice, this list of conditions and the
following disclaimer in the documentation and/or other materials provided with
the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*)
(** {1 Basic String Utils}
Consider using KMP instead. *)
type t = string
val equal : t -> t -> bool
val compare : t -> t -> int
val hash : t -> int
type 'a gen = unit -> 'a option
type 'a sequence = ('a -> unit) -> unit
val is_sub : sub:t -> int -> t -> int -> bool
(** [is_sub ~sub i s j] returns [true] iff [sub] is a substring of [s] starting
at position [j] *)
val split : by:t -> t -> t list
(** split the given string along the given separator [by]. Should only
be used with very small separators, otherwise use {!KMP}.
@raise Failure if [by = ""] *)
val split_gen : by:t -> t -> t gen
val split_seq : by:t -> t -> t sequence
val find : ?start:int -> sub:t -> t -> int
(** Find [sub] in the string, returns its first index or -1.
Should only be used with very small [sub] *)
val repeat : t -> int -> t
(** The same string, repeated n times *)
val prefix : pre:t -> t -> bool
(** [str_prefix ~pre s] returns [true] iff [pre] is a prefix of [s] *)
val to_gen : t -> char gen
val of_gen : char gen -> t
val to_seq : t -> char sequence
val of_seq : char sequence -> t
val pp : Buffer.t -> t -> unit