ocaml-base-compiler
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package ocaml-base-compiler
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Byte sequence operations.

A byte sequence is a mutable data structure that contains a fixed-length sequence of bytes. Each byte can be indexed in constant time for reading or writing.

Given a byte sequence s of length l, we can access each of the l bytes of s via its index in the sequence. Indexes start at 0, and we will call an index valid in s if it falls within the range [0...l-1] (inclusive). A position is the point between two bytes or at the beginning or end of the sequence. We call a position valid in s if it falls within the range [0...l] (inclusive). Note that the byte at index n is between positions n and n+1.

Two parameters start and len are said to designate a valid range of s if len >= 0 and start and start+len are valid positions in s.

Byte sequences can be modified in place, for instance via the set and blit functions described below. See also strings (module String), which are almost the same data structure, but cannot be modified in place.

Bytes are represented by the OCaml type char.

  • since 4.02.0
val length : bytes -> int

Return the length (number of bytes) of the argument.

val get : bytes -> int -> char

get s n returns the byte at index n in argument s.

  • raises Invalid_argument

    if n is not a valid index in s.

val set : bytes -> int -> char -> unit

set s n c modifies s in place, replacing the byte at index n with c.

  • raises Invalid_argument

    if n is not a valid index in s.

val create : int -> bytes

create n returns a new byte sequence of length n. The sequence is uninitialized and contains arbitrary bytes.

val make : int -> char -> bytes

make n c returns a new byte sequence of length n, filled with the byte c.

val init : int -> (int -> char) -> bytes

Bytes.init n f returns a fresh byte sequence of length n, with character i initialized to the result of f i (in increasing index order).

val empty : bytes

A byte sequence of size 0.

val copy : bytes -> bytes

Return a new byte sequence that contains the same bytes as the argument.

val of_string : string -> bytes

Return a new byte sequence that contains the same bytes as the given string.

val to_string : bytes -> string

Return a new string that contains the same bytes as the given byte sequence.

val sub : bytes -> int -> int -> bytes

sub s start len returns a new byte sequence of length len, containing the subsequence of s that starts at position start and has length len.

  • raises Invalid_argument

    if start and len do not designate a valid range of s.

val sub_string : bytes -> int -> int -> string

Same as sub but return a string instead of a byte sequence.

val extend : bytes -> int -> int -> bytes

extend s left right returns a new byte sequence that contains the bytes of s, with left uninitialized bytes prepended and right uninitialized bytes appended to it. If left or right is negative, then bytes are removed (instead of appended) from the corresponding side of s.

val fill : bytes -> int -> int -> char -> unit

fill s start len c modifies s in place, replacing len characters with c, starting at start.

  • raises Invalid_argument

    if start and len do not designate a valid range of s.

val blit : bytes -> int -> bytes -> int -> int -> unit

blit src srcoff dst dstoff len copies len bytes from sequence src, starting at index srcoff, to sequence dst, starting at index dstoff. It works correctly even if src and dst are the same byte sequence, and the source and destination intervals overlap.

  • raises Invalid_argument

    if srcoff and len do not designate a valid range of src, or if dstoff and len do not designate a valid range of dst.

val blit_string : string -> int -> bytes -> int -> int -> unit

blit_string src srcoff dst dstoff len copies len bytes from string src, starting at index srcoff, to byte sequence dst, starting at index dstoff.

  • raises Invalid_argument

    if srcoff and len do not designate a valid range of src, or if dstoff and len do not designate a valid range of dst.

val concat : bytes -> bytes list -> bytes

concat sep sl concatenates the list of byte sequences sl, inserting the separator byte sequence sep between each, and returns the result as a new byte sequence.

val cat : bytes -> bytes -> bytes

cat s1 s2 concatenates s1 and s2 and returns the result as a new byte sequence.

val iter : (char -> unit) -> bytes -> unit

iter f s applies function f in turn to all the bytes of s. It is equivalent to f (get s 0); f (get s 1); ...; f (get s (length s - 1)); ().

val iteri : (int -> char -> unit) -> bytes -> unit

Same as Bytes.iter, but the function is applied to the index of the byte as first argument and the byte itself as second argument.

val map : (char -> char) -> bytes -> bytes

map f s applies function f in turn to all the bytes of s (in increasing index order) and stores the resulting bytes in a new sequence that is returned as the result.

val mapi : (int -> char -> char) -> bytes -> bytes

mapi f s calls f with each character of s and its index (in increasing index order) and stores the resulting bytes in a new sequence that is returned as the result.

val trim : bytes -> bytes

Return a copy of the argument, without leading and trailing whitespace. The bytes regarded as whitespace are the ASCII characters ' ', '\012', '\n', '\r', and '\t'.

val escaped : bytes -> bytes

Return a copy of the argument, with special characters represented by escape sequences, following the lexical conventions of OCaml. All characters outside the ASCII printable range (32..126) are escaped, as well as backslash and double-quote.

val index : bytes -> char -> int

index s c returns the index of the first occurrence of byte c in s.

  • raises Not_found

    if c does not occur in s.

val index_opt : bytes -> char -> int option

index_opt s c returns the index of the first occurrence of byte c in s or None if c does not occur in s.

  • since 4.05
val rindex : bytes -> char -> int

rindex s c returns the index of the last occurrence of byte c in s.

  • raises Not_found

    if c does not occur in s.

val rindex_opt : bytes -> char -> int option

rindex_opt s c returns the index of the last occurrence of byte c in s or None if c does not occur in s.

  • since 4.05
val index_from : bytes -> int -> char -> int

index_from s i c returns the index of the first occurrence of byte c in s after position i. Bytes.index s c is equivalent to Bytes.index_from s 0 c.

  • raises Invalid_argument

    if i is not a valid position in s.

  • raises Not_found

    if c does not occur in s