CCList(cleanup): clean functions that are in the stdlib

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog
 
 ## main
+- breaking: CCListLabel.compare and CCListLabel.equal takes the function on the elements as named arguments
+- breaking: CCListLabel.init now takes the length as a named arguments to follow the Stdlib
 - breaking: invert the argument of CCFun.compose to align it with the Stdlib
 - breaking: change the semantic of CCFloat.{min,max} with respect to NaN to follow the Stdlib
 - breaking: change the semantic of CCInt.rem with respect to negative number to follow the Stdlib

src/core/CCList.ml

@@ -1,43 +1,15 @@
-(* backport new functions from stdlib here *)
-
-[@@@ocaml.warning "-32"]
-
-let rec compare_lengths l1 l2 =
-  match l1, l2 with
-  | [], [] -> 0
-  | [], _ :: _ -> -1
-  | _ :: _, [] -> 1
-  | _ :: tail1, _ :: tail2 -> compare_lengths tail1 tail2
-
-let rec compare_length_with l n =
-  match l, n with
-  | _ when n < 0 -> 1
-  | [], 0 -> 0
-  | [], _ -> -1
-  | _ :: tail, _ -> compare_length_with tail (n - 1)
-
-let rec assoc_opt x = function
-  | [] -> None
-  | (y, v) :: _ when Stdlib.( = ) x y -> Some v
-  | _ :: tail -> assoc_opt x tail
-
-let rec assq_opt x = function
-  | [] -> None
-  | (y, v) :: _ when Stdlib.( == ) x y -> Some v
-  | _ :: tail -> assq_opt x tail
-
-[@@@ocaml.warning "+32"]
-
-(* end of backport *)
-
 include List
 
 let empty = []
 
+[@@@iflt 5.1]
+
 let is_empty = function
   | [] -> true
   | _ :: _ -> false
 
+[@@@endif]
+
 let mguard c =
   if c then
     [ () ]
@@ -392,23 +364,27 @@ let[@tail_mod_cons] rec unfold f seed =
 
 [@@@endif]
 
-let rec compare f l1 l2 =
+[@@@iflt 4.12]
+
+let rec compare cmp l1 l2 =
   match l1, l2 with
   | [], [] -> 0
   | _, [] -> 1
   | [], _ -> -1
   | x1 :: l1', x2 :: l2' ->
-    let c = f x1 x2 in
+    let c = cmp x1 x2 in
     if c <> 0 then
       c
     else
-      compare f l1' l2'
+      compare cmp l1' l2'
 
-let rec equal f l1 l2 =
+let rec equal eq l1 l2 =
   match l1, l2 with
   | [], [] -> true
   | [], _ | _, [] -> false
-  | x1 :: l1', x2 :: l2' -> f x1 x2 && equal f l1' l2'
+  | x1 :: l1', x2 :: l2' -> eq x1 x2 && equal eq l1' l2'
+
+[@@@endif]
 
 [@@@iflt 5.1]
 
@@ -969,6 +945,8 @@ let find_pred_exn p l =
   | None -> raise Not_found
   | Some x -> x
 
+[@@@iflt 5.1]
+
 let find_mapi f l =
   let rec aux f i = function
     | [] -> None
@@ -979,8 +957,14 @@ let find_mapi f l =
   in
   aux f 0 l
 
+[@@@endif]
+
+[@@@iflt 4.10]
+
 let find_map f l = find_mapi (fun _ -> f) l
 
+[@@@endif]
+
 let find_idx p l =
   find_mapi
     (fun i x ->
@@ -999,6 +983,8 @@ let remove ~eq x l =
   in
   remove' eq x [] l
 
+[@@@iflt 5.1]
+
 let filter_map f l =
   let rec recurse acc l =
     match l with
@@ -1013,6 +999,8 @@ let filter_map f l =
   in
   recurse [] l
 
+[@@@endif]
+
 let keep_some l = filter_map (fun x -> x) l
 
 let keep_ok l =
@@ -1215,6 +1203,9 @@ let inter ~eq l1 l2 =
   in
   inter eq [] l1 l2
 
+[@@@iflt 5.1]
+
+(* Because our map is tail rec between 4.13 and 5.1 *)
 let mapi f l =
   let r = ref 0 in
   map
@@ -1224,6 +1215,8 @@ let mapi f l =
       y)
     l
 
+[@@@endif]
+
 let iteri f l =
   let rec aux f i l =
     match l with
@@ -1547,11 +1540,6 @@ let to_string ?(start = "") ?(stop = "") ?(sep = ", ") item_to_string l =
 
 let to_iter l k = List.iter k l
 
-let rec to_seq l () =
-  match l with
-  | [] -> Seq.Nil
-  | x :: tl -> Seq.Cons (x, to_seq tl)
-
 let of_iter i =
   let l = ref [] in
   i (fun x -> l := x :: !l);

src/core/CCList.mli

@@ -16,10 +16,14 @@ type +'a t = 'a list
 val empty : 'a t
 (** [empty] is [[]]. *)
 
+[@@@iflt 5.1]
+
 val is_empty : _ t -> bool
 (** [is_empty l] returns [true] iff [l = []].
     @since 0.11 *)
 
+[@@@endif]
+
 val cons_maybe : 'a option -> 'a t -> 'a t
 (** [cons_maybe (Some x) l] is [x :: l].
     [cons_maybe None l] is [l].
@@ -127,11 +131,6 @@ val count_true_false : ('a -> bool) -> 'a list -> int * int
     that satisfy the predicate [p], and [int2] the number of elements that do not satisfy [p].
     @since 2.4 *)
 
-val init : int -> (int -> 'a) -> 'a t
-(** [init len f] is [f 0; f 1; …; f (len-1)].
-    @raise Invalid_argument if len < 0.
-    @since 0.6 *)
-
 val combine : 'a list -> 'b list -> ('a * 'b) list
 (** [combine [a1; …; an] [b1; …; bn]] is [[(a1,b1); …; (an,bn)]].
     Transform two lists into a list of pairs.
@@ -161,25 +160,17 @@ val split : ('a * 'b) t -> 'a t * 'b t
     @since 1.2, but only
     @since 2.2 with labels *)
 
+[@@@iflt 4.12]
+
 val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
 (** [compare cmp l1 l2] compares the two lists [l1] and [l2]
     using the given comparison function [cmp]. *)
 
-val compare_lengths : 'a t -> 'b t -> int
-(** [compare_lengths l1 l2] compare the lengths of the two lists [l1] and [l2].
-    Equivalent to [compare (length l1) (length l2)] but more efficient.
-    @since 1.5, but only
-    @since 2.2 with labels *)
-
-val compare_length_with : 'a t -> int -> int
-(** [compare_length_with l x] compares the length of the list [l] to an integer [x].
-    Equivalent to [compare (length l) x] but more efficient.
-    @since 1.5, but only
-    @since 2.2 with labels *)
-
 val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
 (** [equal p l1 l2] returns [true] if [l1] and [l2] are equal. *)
 
+[@@@endif]
+
 val flat_map : ('a -> 'b t) -> 'a t -> 'b t
 (** [flat_map f l] maps and flattens at the same time (safe). Evaluation order is not guaranteed. *)
 
@@ -437,26 +428,29 @@ val find_pred : ('a -> bool) -> 'a t -> 'a option
     or returns [None] if no element satisfies [p].
     @since 0.11 *)
 
-val find_opt : ('a -> bool) -> 'a t -> 'a option
-(** [find_opt p l] is the safe version of {!find}.
-    @since 1.5, but only
-    @since 2.2 with labels *)
-
 val find_pred_exn : ('a -> bool) -> 'a t -> 'a
 (** [find_pred_exn p l] is the unsafe version of {!find_pred}.
     @raise Not_found if no such element is found.
     @since 0.11 *)
 
+[@@@iflt 4.10]
+
 val find_map : ('a -> 'b option) -> 'a t -> 'b option
 (** [find_map f l] traverses [l], applying [f] to each element. If for
     some element [x], [f x = Some y], then [Some y] is returned. Otherwise
     the call returns [None].
     @since 0.11 *)
 
+[@@@endif]
+
+[@@@iflt 5.1]
+
 val find_mapi : (int -> 'a -> 'b option) -> 'a t -> 'b option
 (** [find_mapi f l] is like {!find_map}, but also pass the index to the predicate function.
     @since 0.11 *)
 
+[@@@endif]
+
 val find_idx : ('a -> bool) -> 'a t -> (int * 'a) option
 (** [find_idx p x] returns [Some (i,x)] where [x] is the [i]-th element of [l],
     and [p x] holds. Otherwise returns [None]. *)
@@ -467,11 +461,6 @@ val remove : eq:('a -> 'a -> bool) -> key:'a -> 'a t -> 'a t
     @since 0.11 *)
 (* FIXME: the original CCList.mli uses ~x instead of ~key !! *)
 
-val filter_map : ('a -> 'b option) -> 'a t -> 'b t
-(** [filter_map f l] is the sublist of [l] containing only elements for which
-    [f] returns [Some e].
-    Map and remove elements at the same time. *)
-
 val keep_some : 'a option t -> 'a t
 (** [keep_some l] retains only elements of the form [Some x].
     Like [filter_map CCFun.id].
@@ -574,16 +563,6 @@ val group_succ : eq:('a -> 'a -> bool) -> 'a list -> 'a list list
 
 (** {2 Indices} *)
 
-val mapi : (int -> 'a -> 'b) -> 'a t -> 'b t
-(** [mapi f l] is like {!map}, but the function [f] is applied to the index of
-    the element as first argument (counting from 0), and the element
-    itself as second argument. *)
-
-val iteri : (int -> 'a -> unit) -> 'a t -> unit
-(** [iteri f l] is like {!val-iter}, but the function [f] is applied to the index of
-    the element as first argument (counting from 0), and the element
-    itself as second argument. *)
-
 val iteri2 : (int -> 'a -> 'b -> unit) -> 'a t -> 'b t -> unit
 (** [iteri2 f l1 l2] applies [f] to the two lists [l1] and [l2] simultaneously.
     The integer passed to [f] indicates the index of element.
@@ -758,14 +737,6 @@ val assoc_opt : eq:('a -> 'a -> bool) -> 'a -> ('a * 'b) t -> 'b option
     @since 1.5, but only
     @since 2.0 with labels *)
 
-val assq_opt : 'a -> ('a * 'b) t -> 'b option
-(** [assq_opt k alist] returns [Some v] if the given key [k] is present into [alist].
-    Like [Assoc.assoc_opt] but use physical equality instead of structural equality
-    to compare keys.
-    Safe version of {!assq}.
-    @since 1.5, but only
-    @since 2.0 with labels *)
-
 val mem_assoc : ?eq:('a -> 'a -> bool) -> 'a -> ('a * _) t -> bool
 (** [mem_assoc ?eq k alist] returns [true] iff [k] is a key in [alist].
     Like [Assoc.mem].
@@ -884,11 +855,6 @@ val to_iter : 'a t -> 'a iter
 (** [to_iter l] returns a [iter] of the elements of the list [l].
     @since 2.8 *)
 
-val to_seq : 'a t -> 'a Seq.t
-(** [to_seq l] returns a [Seq.t] of the elements of the list [l].
-    Renamed from [to_std_seq] since 3.0.
-    @since 3.0 *)
-
 val of_iter : 'a iter -> 'a t
 (** [of_iter iter] builds a list from a given [iter].
     In the result, elements appear in the same order as they did in the source [iter].
@@ -899,12 +865,6 @@ val of_seq_rev : 'a Seq.t -> 'a t
     Renamed from [to_std_seq_rev] since 3.0.
     @since 3.0 *)
 
-val of_seq : 'a Seq.t -> 'a t
-(** [of_seq seq] builds a list from a given [Seq.t].
-    In the result, elements appear in the same order as they did in the source [Seq.t].
-    Renamed from [of_std_seq] since 3.0.
-    @since 3.0 *)
-
 val to_gen : 'a t -> 'a gen
 (** [to_gen l] returns a [gen] of the elements of the list [l]. *)