mirror of
https://github.com/c-cube/ocaml-containers.git
synced 2025-12-06 11:15:31 -05:00
functorize ring buffer over ARRAY sig
This commit is contained in:
carm
parent
07f0afcd28
commit
c7607f8ce7
2 changed files with 291 additions and 244 deletions
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@ -22,234 +22,255 @@
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(** Polymorphic Circular Buffer for IO *)
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type 'a t = {
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mutable start : int;
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mutable stop : int; (* excluded *)
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mutable buf : 'a array;
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bounded : bool;
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size : int
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}
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module type ARRAY = sig
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type elt
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type t
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exception Empty
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val make: int -> elt -> t
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val length: t -> int
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let create ?(bounded=false) size =
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{ start=0;
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stop=0;
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bounded;
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size;
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buf = Array.of_list []
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val get: t -> int -> elt
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val set: t -> int -> elt -> unit
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val sub: t -> int -> int -> t
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val max_length: int
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val copy : t -> t
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val of_list : elt list -> t
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val to_list : t -> elt list
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val blit : t -> int -> t -> int -> int -> unit
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val iter : (elt -> unit) -> t -> unit
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end
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module Make(Array:ARRAY) =
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struct
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type t = {
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mutable start : int;
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mutable stop : int; (* excluded *)
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mutable buf : Array.t;
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bounded : bool;
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size : int
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}
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let copy b =
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{ b with buf=Array.copy b.buf; }
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exception Empty
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let create ?(bounded=false) size =
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{ start=0;
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stop=0;
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bounded;
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size;
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buf = Array.of_list []
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}
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let copy b =
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{ b with buf=Array.copy b.buf; }
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let capacity b = Array.length b.buf
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let capacity b = Array.length b.buf
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let max_capacity b = if b.bounded then Some b.size else None
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let max_capacity b = if b.bounded then Some b.size else None
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let length b =
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if b.stop >= b.start
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then b.stop - b.start
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else (Array.length b.buf - b.start) + b.stop
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(* resize [b] so that inner capacity is [cap] *)
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let resize b cap elem =
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assert (cap >= Array.length b.buf);
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let buf' = Array.make cap elem in
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(* copy into buf' *)
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let _:int =
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let length b =
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if b.stop >= b.start
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then begin
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Array.blit b.buf b.start buf' 0 (b.stop - b.start);
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b.stop - b.start
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end else begin
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let len_end = Array.length b.buf - b.start in
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Array.blit b.buf b.start buf' 0 len_end;
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Array.blit b.buf 0 buf' len_end b.stop;
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len_end + b.stop
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end
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in
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b.buf <- buf'
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then b.stop - b.start
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else (Array.length b.buf - b.start) + b.stop
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let blit_from_bounded b from_buf o len =
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let cap = capacity b - len in
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(* resize if needed, with a constant to amortize *)
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if cap < len then begin
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let new_size =
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let desired = Array.length b.buf + len + 24 in
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min (b.size+1) desired in
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resize b new_size from_buf.(0)
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end;
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let sub = Array.sub from_buf o len in
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let iter x =
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let capacity = capacity b in
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Array.set b.buf b.stop x;
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if b.stop = capacity-1 then b.stop <- 0 else b.stop <- b.stop + 1;
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if b.start = b.stop then
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begin
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if b.start = capacity-1 then b.start <- 0 else b.start <- b.start + 1
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(* resize [b] so that inner capacity is [cap] *)
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let resize b cap elem =
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assert (cap >= Array.length b.buf);
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let buf' = Array.make cap elem in
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(* copy into buf' *)
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let _:int =
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if b.stop >= b.start
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then begin
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Array.blit b.buf b.start buf' 0 (b.stop - b.start);
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b.stop - b.start
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end else begin
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let len_end = Array.length b.buf - b.start in
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Array.blit b.buf b.start buf' 0 len_end;
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Array.blit b.buf 0 buf' len_end b.stop;
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len_end + b.stop
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end
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in
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Array.iter iter sub
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in
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b.buf <- buf'
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let blit_from_bounded b from_buf o len =
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let cap = capacity b - len in
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(* resize if needed, with a constant to amortize *)
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if cap < len then begin
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let new_size =
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let desired = Array.length b.buf + len + 24 in
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min (b.size+1) desired in
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resize b new_size from_buf.(0)
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end;
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let sub = Array.sub from_buf o len in
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let iter x =
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let capacity = capacity b in
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Array.set b.buf b.stop x;
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if b.stop = capacity-1 then b.stop <- 0 else b.stop <- b.stop + 1;
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if b.start = b.stop then
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begin
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if b.start = capacity-1 then b.start <- 0 else b.start <- b.start + 1
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end
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in
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Array.iter iter sub
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let blit_from_unbounded b from_buf o len =
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let cap = capacity b - len in
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(* resize if needed, with a constant to amortize *)
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if cap < len then resize b (max b.size (Array.length b.buf + len + 24)) from_buf.(0);
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assert (capacity b - length b >= len);
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if b.stop >= b.start
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then (* [_______ start xxxxxxxxx stop ______] *)
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let len_end = Array.length b.buf - b.stop in
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if len_end >= len
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then (Array.blit from_buf o b.buf b.stop len;
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b.stop <- b.stop + len)
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else (Array.blit from_buf o b.buf b.stop len_end;
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Array.blit from_buf (o+len_end) b.buf 0 (len-len_end);
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b.stop <- len-len_end)
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else begin (* [xxxxx stop ____________ start xxxxxx] *)
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let len_middle = b.start - b.stop in
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assert (len_middle >= len);
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Array.blit from_buf o b.buf b.stop len;
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b.stop <- b.stop + len
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end;
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()
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let blit_from_unbounded b from_buf o len =
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let cap = capacity b - len in
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(* resize if needed, with a constant to amortize *)
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if cap < len then resize b (max b.size (Array.length b.buf + len + 24)) from_buf.(0);
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assert (capacity b - length b >= len);
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if b.stop >= b.start
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then (* [_______ start xxxxxxxxx stop ______] *)
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let len_end = Array.length b.buf - b.stop in
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if len_end >= len
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then (Array.blit from_buf o b.buf b.stop len;
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b.stop <- b.stop + len)
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else (Array.blit from_buf o b.buf b.stop len_end;
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Array.blit from_buf (o+len_end) b.buf 0 (len-len_end);
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b.stop <- len-len_end)
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else begin (* [xxxxx stop ____________ start xxxxxx] *)
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let len_middle = b.start - b.stop in
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assert (len_middle >= len);
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Array.blit from_buf o b.buf b.stop len;
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b.stop <- b.stop + len
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end;
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()
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let blit_from b from_buf o len =
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if (Array.length from_buf) = 0 then () else
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if b.bounded then
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blit_from_bounded b from_buf o len
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else
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blit_from_unbounded b from_buf o len
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let blit_from b from_buf o len =
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if (Array.length from_buf) = 0 then () else
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if b.bounded then
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blit_from_bounded b from_buf o len
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else
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blit_from_unbounded b from_buf o len
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let blit_into b to_buf o len =
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if o+len > Array.length to_buf
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let blit_into b to_buf o len =
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if o+len > Array.length to_buf
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then raise (Invalid_argument "BufferIO.blit_into");
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if b.stop >= b.start
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then
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let n = min (b.stop - b.start) len in
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let _ = Array.blit b.buf b.start to_buf o n in
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n
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else begin
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let len_end = Array.length b.buf - b.start in
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Array.blit b.buf b.start to_buf o (min len_end len);
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if len_end >= len
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then len (* done *)
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if b.stop >= b.start
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then
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let n = min (b.stop - b.start) len in
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let _ = Array.blit b.buf b.start to_buf o n in
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n
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else begin
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let n = min b.stop (len - len_end) in
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Array.blit b.buf 0 to_buf (o+len_end) n;
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n + len_end
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let len_end = Array.length b.buf - b.start in
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Array.blit b.buf b.start to_buf o (min len_end len);
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if len_end >= len
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then len (* done *)
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else begin
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let n = min b.stop (len - len_end) in
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Array.blit b.buf 0 to_buf (o+len_end) n;
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n + len_end
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end
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end
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end
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let add b s = blit_from b s 0 (Array.length s)
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let add b s = blit_from b s 0 (Array.length s)
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(*$Q
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(Q.pair Q.printable_string Q.printable_string) (fun (s,s') -> \
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(*$Q
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(Q.pair Q.printable_string Q.printable_string) (fun (s,s') -> \
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let b = create 24 in add b s; add_string b s'; \
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Array.length s + String.length s' = length b)
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*)
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*)
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let clear b =
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b.stop <- 0;
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b.start <- 0;
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()
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let clear b =
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b.stop <- 0;
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b.start <- 0;
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()
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let reset b =
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clear b;
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b.buf <- Array.of_list []
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let reset b =
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clear b;
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b.buf <- Array.of_list []
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let is_empty b = b.start = b.stop
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let is_empty b = b.start = b.stop
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let next b =
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if b.start = b.stop then raise Empty;
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b.buf.(b.start)
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let next b =
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if b.start = b.stop then raise Empty;
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b.buf.(b.start)
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let take_front b =
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if b.start = b.stop then raise Empty;
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let c = b.buf.(b.start) in
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if b.start + 1 = Array.length b.buf
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then b.start <- 0
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else b.start <- b.start + 1;
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c
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let take_front b =
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if b.start = b.stop then raise Empty;
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let c = b.buf.(b.start) in
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if b.start + 1 = Array.length b.buf
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then b.start <- 0
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else b.start <- b.start + 1;
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c
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let take_back b =
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if b.start = b.stop then raise Empty;
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if b.stop - 1 = 0
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then b.stop <- Array.length b.buf - 1
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else b.stop <- b.stop - 1;
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b.buf.(b.stop)
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let take_back b =
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if b.start = b.stop then raise Empty;
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if b.stop - 1 = 0
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then b.stop <- Array.length b.buf - 1
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else b.stop <- b.stop - 1;
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b.buf.(b.stop)
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let junk b =
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if b.start = b.stop then raise Empty;
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if b.start + 1 = Array.length b.buf
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then b.start <- 0
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else b.start <- b.start + 1
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let junk b =
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if b.start = b.stop then raise Empty;
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if b.start + 1 = Array.length b.buf
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then b.start <- 0
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else b.start <- b.start + 1
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let skip b len =
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if len > length b then raise (Invalid_argument "BufferIO.skip");
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if b.stop >= b.start
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then b.start <- b.start + len
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else
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let len_end = Array.length b.buf - b.start in
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if len > len_end
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then b.start <- len-len_end (* wrap to the beginning *)
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else b.start <- b.start + len
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let skip b len =
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if len > length b then raise (Invalid_argument "BufferIO.skip");
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if b.stop >= b.start
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then b.start <- b.start + len
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else
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let len_end = Array.length b.buf - b.start in
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if len > len_end
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then b.start <- len-len_end (* wrap to the beginning *)
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else b.start <- b.start + len
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(*$Q
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(Q.pair Q.printable_string Q.printable_string) (fun (s,s') -> \
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(*$Q
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(Q.pair Q.printable_string Q.printable_string) (fun (s,s') -> \
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let b = create 24 in add_string b s; add_string b s'; \
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add_string b "hello world"; (* big enough *) \
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let l = length b in let l' = l/2 in skip b l'; \
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length b + l' = l)
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*)
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*)
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let iteri b f =
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if b.stop >= b.start
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then for i = b.start to b.stop - 1 do f i b.buf.(i) done
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else (
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for i = b.start to Array.length b.buf -1 do f i b.buf.(i) done;
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for i = 0 to b.stop - 1 do f i b.buf.(i) done;
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)
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let iteri b f =
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if b.stop >= b.start
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then for i = b.start to b.stop - 1 do f i b.buf.(i) done
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else (
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for i = b.start to Array.length b.buf -1 do f i b.buf.(i) done;
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for i = 0 to b.stop - 1 do f i b.buf.(i) done;
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)
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(*$T
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let s = "hello world" in \
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let b = of_string s in \
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try iteri b (fun i c -> if s.[i] <> c then raise Exit); true with Exit -> false
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*)
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(*$T
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let s = "hello world" in \
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let b = of_string s in \
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try iteri b (fun i c -> if s.[i] <> c then raise Exit); true with Exit -> false
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*)
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let get b i =
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if b.stop >= b.start
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then
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if i >= b.stop - b.start
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then raise (Invalid_argument "BufferIO.get")
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else b.buf.(b.start + i)
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else
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let len_end = Array.length b.buf - b.start in
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if i < len_end
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let get b i =
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if b.stop >= b.start
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then
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if i >= b.stop - b.start
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then raise (Invalid_argument "BufferIO.get")
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else b.buf.(b.start + i)
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else
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let len_end = Array.length b.buf - b.start in
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if i < len_end
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then b.buf.(b.start + i)
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else if i - len_end > b.stop
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else if i - len_end > b.stop
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then raise (Invalid_argument "BufferIO.get")
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else b.buf.(i - len_end)
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let to_list b =
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if (b.stop >= b.start)
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let to_list b =
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if (b.stop >= b.start)
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then Array.to_list (Array.sub b.buf b.start (b.stop-b.start))
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else List.append
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(Array.to_list (Array.sub b.buf b.start (Array.length b.buf - b.start)))
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(Array.to_list (Array.sub b.buf 0 b.stop))
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let push_back b e = add b (Array.of_list [e])
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let peek_front b = if is_empty b then
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raise Empty else Array.get b.buf b.start
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let peek_back b = if is_empty b then
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raise Empty else Array.get b.buf
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(if b.stop = 0 then capacity b - 1 else b.stop-1)
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else List.append
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(Array.to_list (Array.sub b.buf b.start (Array.length b.buf - b.start)))
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(Array.to_list (Array.sub b.buf 0 b.stop))
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let push_back b e = add b (Array.of_list [e])
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let peek_front b = if is_empty b then
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raise Empty else Array.get b.buf b.start
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let peek_back b = if is_empty b then
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raise Empty else Array.get b.buf
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(if b.stop = 0 then capacity b - 1 else b.stop-1)
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end
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@ -20,89 +20,115 @@
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|
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(** Circular Polymorphic Buffer for IO *)
|
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|
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type 'a t = private {
|
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mutable start : int;
|
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mutable stop : int; (* excluded *)
|
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mutable buf : 'a array;
|
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bounded: bool;
|
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size : int
|
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}
|
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module type ARRAY = sig
|
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type elt
|
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type t
|
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|
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exception Empty
|
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val make: int -> elt -> t
|
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val length: t -> int
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|
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val create : ?bounded:bool -> int -> 'a t
|
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(** [create ?bounded size] creates a new buffer with given size.
|
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Defaults to [bounded=false]. *)
|
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val get: t -> int -> elt
|
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|
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val copy : 'a t ->'a t
|
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(** fresh copy of the buffer *)
|
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val set: t -> int -> elt -> unit
|
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|
||||
val capacity : 'a t -> int
|
||||
(** length of the inner buffer *)
|
||||
val sub: t -> int -> int -> t
|
||||
val max_length: int
|
||||
|
||||
val max_capacity : 'a t -> int option
|
||||
(** maximum length of the inner buffer, or [None] if unbounded. *)
|
||||
val copy : t -> t
|
||||
val of_list : elt list -> t
|
||||
val to_list : t -> elt list
|
||||
val blit : t -> int -> t -> int -> int -> unit
|
||||
|
||||
val length : 'a t -> int
|
||||
(** number of elements currently stored in the buffer *)
|
||||
val iter : (elt -> unit) -> t -> unit
|
||||
end
|
||||
|
||||
val blit_from : 'a t -> 'a array -> int -> int -> unit
|
||||
(** [blit_from buf from_buf o len] copies the slice [o, ... o + len - 1] from
|
||||
a input buffer [from_buf] to the end of the buffer.
|
||||
@raise Invalid_argument if [o,len] is not a valid slice of [s] *)
|
||||
|
||||
val blit_into : 'a t -> 'a array -> int -> int -> int
|
||||
(** [blit_into buf to_buf o len] copies at most [len] elements from [buf]
|
||||
into [to_buf] starting at offset [o] in [s].
|
||||
@return the number of elements actually copied ([min len (length buf)]).
|
||||
@raise Invalid_argument if [o,len] is not a valid slice of [s] *)
|
||||
module Make : functor (Array:ARRAY) ->
|
||||
sig
|
||||
|
||||
val to_list : 'a t -> 'a list
|
||||
(** extract the current content into a list *)
|
||||
type t = private {
|
||||
mutable start : int;
|
||||
mutable stop : int; (* excluded *)
|
||||
mutable buf : Array.t;
|
||||
bounded: bool;
|
||||
size : int
|
||||
}
|
||||
|
||||
val clear : 'a t -> unit
|
||||
(** clear the content of the buffer. Doesn't actually destroy the content. *)
|
||||
exception Empty
|
||||
|
||||
val reset : 'a t -> unit
|
||||
(** clear the content of the buffer, and also resize it to a default size *)
|
||||
val create : ?bounded:bool -> int -> t
|
||||
(** [create ?bounded size] creates a new buffer with given size.
|
||||
Defaults to [bounded=false]. *)
|
||||
|
||||
val is_empty :'a t -> bool
|
||||
(** is the buffer empty (i.e. contains no elements)? *)
|
||||
val copy : t -> t
|
||||
(** fresh copy of the buffer *)
|
||||
|
||||
val next : 'a t -> 'a
|
||||
(** obtain next element (the first one of the buffer)
|
||||
@raise Empty if the buffer is empty *)
|
||||
val capacity : t -> int
|
||||
(** length of the inner buffer *)
|
||||
|
||||
val junk : 'a t -> unit
|
||||
(** Drop next element.
|
||||
@raise Empty if the buffer is already empty *)
|
||||
val max_capacity : t -> int option
|
||||
(** maximum length of the inner buffer, or [None] if unbounded. *)
|
||||
|
||||
val skip : 'a t -> int -> unit
|
||||
(** [skip b len] removes [len] elements from [b].
|
||||
@raise Invalid_argument if [len > length b]. *)
|
||||
val length : t -> int
|
||||
(** number of elements currently stored in the buffer *)
|
||||
|
||||
val iteri : 'a t -> (int -> 'a -> unit) -> unit
|
||||
(** [iteri b f] calls [f i t] for each element [t] in [buf], with [i]
|
||||
being its relative index within [buf]. *)
|
||||
val blit_from : t -> Array.t -> int -> int -> unit
|
||||
(** [blit_from buf from_buf o len] copies the slice [o, ... o + len - 1] from
|
||||
a input buffer [from_buf] to the end of the buffer.
|
||||
@raise Invalid_argument if [o,len] is not a valid slice of [s] *)
|
||||
|
||||
val get : 'a t -> int -> 'a
|
||||
(** [get buf i] returns the [i]-th element of [buf], ie the one that
|
||||
is returned by [next buf] after [i-1] calls to [junk buf].
|
||||
@raise Invalid_argument if the index is invalid (> [length buf]) *)
|
||||
val blit_into : t -> Array.t -> int -> int -> int
|
||||
(** [blit_into buf to_buf o len] copies at most [len] elements from [buf]
|
||||
into [to_buf] starting at offset [o] in [s].
|
||||
@return the number of elements actually copied ([min len (length buf)]).
|
||||
@raise Invalid_argument if [o,len] is not a valid slice of [s] *)
|
||||
|
||||
val push_back : 'a t -> 'a -> unit
|
||||
val to_list : t -> Array.elt list
|
||||
(** extract the current content into a list *)
|
||||
|
||||
val clear : t -> unit
|
||||
(** clear the content of the buffer. Doesn't actually destroy the content. *)
|
||||
|
||||
val reset : t -> unit
|
||||
(** clear the content of the buffer, and also resize it to a default size *)
|
||||
|
||||
val is_empty :t -> bool
|
||||
(** is the buffer empty (i.e. contains no elements)? *)
|
||||
|
||||
val next : t -> Array.elt
|
||||
(** obtain next element (the first one of the buffer)
|
||||
@raise Empty if the buffer is empty *)
|
||||
|
||||
val junk : t -> unit
|
||||
(** Drop next element.
|
||||
@raise Empty if the buffer is already empty *)
|
||||
|
||||
val skip : t -> int -> unit
|
||||
(** [skip b len] removes [len] elements from [b].
|
||||
@raise Invalid_argument if [len > length b]. *)
|
||||
|
||||
val iteri : t -> (int -> Array.elt -> unit) -> unit
|
||||
(** [iteri b f] calls [f i t] for each element [t] in [buf], with [i]
|
||||
being its relative index within [buf]. *)
|
||||
|
||||
val get : t -> int -> Array.elt
|
||||
(** [get buf i] returns the [i]-th element of [buf], ie the one that
|
||||
is returned by [next buf] after [i-1] calls to [junk buf].
|
||||
@raise Invalid_argument if the index is invalid (> [length buf]) *)
|
||||
|
||||
val push_back : t -> Array.elt -> unit
|
||||
(** Push value at the back *)
|
||||
|
||||
val peek_front : 'a t -> 'a
|
||||
val peek_front : t -> Array.elt
|
||||
(** First value, or Empty *)
|
||||
|
||||
val peek_back : 'a t -> 'a
|
||||
val peek_back : t -> Array.elt
|
||||
(** Last value, or Empty *)
|
||||
|
||||
val take_back : 'a t -> 'a
|
||||
val take_back : t -> Array.elt
|
||||
(** Take last value, or raise Empty *)
|
||||
|
||||
val take_front : 'a t -> 'a
|
||||
val take_front : t -> Array.elt
|
||||
(** Take first value, or raise Empty *)
|
||||
|
||||
|
||||
end
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue