[Libguestfs] [PATCH v2 1/4] common/mlstdutils: Extend the List module.

Richard W.M. Jones
Sun, 08 Oct 2017 21:26:53 -0000

We defined a number of functions on lists which are not provided by
the standard library.  As with Char and String, let's extend List to
add these new functions to a List pseudo-module (really
Std_utils.List, but called List when you ‘open Std_utils’).

The initial exported functions are all List functions from OCaml 3.11
+ iteri + mapi.  We can add other functions as needed.
---
 common/mlstdutils/std_utils.ml  |  4 ++++
 common/mlstdutils/std_utils.mli | 47 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/common/mlstdutils/std_utils.ml b/common/mlstdutils/std_utils.ml
index fca76c208..67d449ac2 100644
--- a/common/mlstdutils/std_utils.ml
+++ b/common/mlstdutils/std_utils.ml
@@ -271,6 +271,10 @@ module String = struct
       loop 0
 end

+module List = struct
+    include List
+end
+
 let (//) = Filename.concat
 let quote = Filename.quote

diff --git a/common/mlstdutils/std_utils.mli b/common/mlstdutils/std_utils.mli
index 786f42591..f3f9c01cb 100644
--- a/common/mlstdutils/std_utils.mli
+++ b/common/mlstdutils/std_utils.mli
@@ -134,6 +134,53 @@ module String : sig
 end
 (** Override the String module from stdlib. *)

+module List : sig
+    val length : 'a list -> int
+    val hd : 'a list -> 'a
+    val tl : 'a list -> 'a list
+    val nth : 'a list -> int -> 'a
+    val rev : 'a list -> 'a list
+    val append : 'a list -> 'a list -> 'a list
+    val rev_append : 'a list -> 'a list -> 'a list
+    val concat : 'a list list -> 'a list
+    val flatten : 'a list list -> 'a list
+    val iter : ('a -> unit) -> 'a list -> unit
+    val iteri : (int -> 'a -> unit) -> 'a list -> unit
+    val map : ('a -> 'b) -> 'a list -> 'b list
+    val mapi : (int -> 'a -> 'b) -> 'a list -> 'b
list
+    val rev_map : ('a -> 'b) -> 'a list -> 'b list
+    val fold_left : ('a -> 'b -> 'a) -> 'a ->
'b list -> 'a
+    val fold_right : ('a -> 'b -> 'b) -> 'a list ->
'b -> 'b
+    val iter2 : ('a -> 'b -> unit) -> 'a list -> 'b
list -> unit
+    val map2 : ('a -> 'b -> 'c) -> 'a list ->
'b list -> 'c list
+    val rev_map2 : ('a -> 'b -> 'c) -> 'a list ->
'b list -> 'c list
+    val fold_left2 : ('a -> 'b -> 'c -> 'a) ->
'a -> 'b list -> 'c list -> 'a
+    val fold_right2 : ('a -> 'b -> 'c -> 'c) ->
'a list -> 'b list -> 'c -> 'c
+    val for_all : ('a -> bool) -> 'a list -> bool
+    val exists : ('a -> bool) -> 'a list -> bool
+    val for_all2 : ('a -> 'b -> bool) -> 'a list ->
'b list -> bool
+    val exists2 : ('a -> 'b -> bool) -> 'a list ->
'b list -> bool
+    val mem : 'a -> 'a list -> bool
+    val memq : 'a -> 'a list -> bool
+    val find : ('a -> bool) -> 'a list -> 'a
+    val filter : ('a -> bool) -> 'a list -> 'a list
+    val find_all : ('a -> bool) -> 'a list -> 'a list
+    val partition : ('a -> bool) -> 'a list -> 'a list *
'a list
+    val assoc : 'a -> ('a * 'b) list -> 'b
+    val assq : 'a -> ('a * 'b) list -> 'b
+    val mem_assoc : 'a -> ('a * 'b) list -> bool
+    val mem_assq : 'a -> ('a * 'b) list -> bool
+    val remove_assoc : 'a -> ('a * 'b) list -> ('a *
'b) list
+    val remove_assq : 'a -> ('a * 'b) list -> ('a *
'b) list
+    val split : ('a * 'b) list -> 'a list * 'b list
+    val combine : 'a list -> 'b list -> ('a * 'b) list
+    val sort : ('a -> 'a -> int) -> 'a list -> 'a
list
+    val stable_sort : ('a -> 'a -> int) -> 'a list ->
'a list
+    val fast_sort : ('a -> 'a -> int) -> 'a list ->
'a list
+    val merge : ('a -> 'a -> int) -> 'a list -> 'a
list -> 'a list
+end
+(** Override the List module from stdlib. *)
+
 val ( // ) : string -> string -> string
 (** Concatenate directory and filename. *)

--
2.13.2