Module Base__.Buffer

Extensible character buffers.

This module implements character buffers that automatically expand as necessary. It provides cumulative concatenation of strings in quasi-linear time (instead of quadratic time when strings are concatenated pairwise).

module type S = Base__.Buffer_intf.S

Buffers using strings as underlying storage medium:

include S with type S.t = Caml.Buffer.t
type t = Caml.Buffer.t
val sexp_of_t : t ‑> Base.Sexp.t
val create : int ‑> t

create n returns a fresh buffer, initially empty. The n parameter is the initial size of the internal storage medium that holds the buffer contents. That storage is automatically reallocated when more than n characters are stored in the buffer, but shrinks back to n characters when reset is called.

For best performance, n should be of the same order of magnitude as the number of characters that are expected to be stored in the buffer (for instance, 80 for a buffer that holds one output line). Nothing bad will happen if the buffer grows beyond that limit, however. In doubt, take n = 16 for instance.

val contents : t ‑> string

Return a copy of the current contents of the buffer. The buffer itself is unchanged.

val contents_bytes : t ‑> bytes
val blit : (t, bytes) Base__.Blit_intf.blit
val blito : (t, bytes) Base__.Blit_intf.blito
val unsafe_blit : (t, bytes) Base__.Blit_intf.blit
val sub : (t, bytes) Base__.Blit_intf.sub
val subo : (t, bytes) Base__.Blit_intf.subo
val nth : t ‑> int ‑> char

Gets the (zero-based) n-th character of the buffer. Raises Invalid_argument if index out of bounds.

val length : t ‑> int

Returns the number of characters currently contained in the buffer.

val clear : t ‑> unit

Empties the buffer.

val reset : t ‑> unit

Empties the buffer and deallocates the internal storage holding the buffer contents, replacing it with the initial internal storage of length n that was allocated by create n. For long-lived buffers that may have grown a lot, reset allows faster reclamation of the space used by the buffer.

val add_char : t ‑> char ‑> unit

add_char b c appends the character c at the end of the buffer b.

val add_string : t ‑> string ‑> unit

add_string b s appends the string s at the end of the buffer b.

val add_substring : t ‑> string ‑> pos:int ‑> len:int ‑> unit

add_substring b s pos len takes len characters from offset pos in string s and appends them at the end of the buffer b.

val add_bytes : t ‑> bytes ‑> unit

add_bytes b s appends the bytes s at the end of the buffer b.

val add_subbytes : t ‑> bytes ‑> pos:int ‑> len:int ‑> unit

add_subbytes b s pos len takes len characters from offset pos in bytes s and appends them at the end of the buffer b.

val add_buffer : t ‑> t ‑> unit

add_buffer b1 b2 appends the current contents of buffer b2 at the end of buffer b1. b2 is not modified.