Module CCUtf8_string

Unicode String, in UTF8

A unicode string represented by a utf8 bytestring. This representation is convenient for manipulating normal OCaml strings that are encoded in UTF8.

We perform only basic decoding and encoding between codepoints and bytestrings. For more elaborate operations, please use the excellent Uutf.

status: experimental

type uchar = Stdlib.Uchar.t
type 'a gen = unit -> 'a option
type 'a iter = ( 'a -> unit ) -> unit

Fast internal iterator.

  • since 2.8
type t = private string

A UTF8 string

val equal : t -> t -> bool
val hash : t -> int
val compare : t -> t -> int
val pp : Stdlib.Format.formatter -> t -> unit
val to_string : t -> string

Identity.

exception Malformed of string * int

Malformed string at given offset

val to_gen : ?idx:int -> t -> uchar gen

Generator of unicode codepoints.

  • parameter idx

    offset where to start the decoding.

val to_iter : ?idx:int -> t -> uchar iter

Iterator of unicode codepoints.

  • parameter idx

    offset where to start the decoding.

  • since 2.8
val to_seq : ?idx:int -> t -> uchar Stdlib.Seq.t

Iter of unicode codepoints. Renamed from to_std_seq since 3.0.

  • parameter idx

    offset where to start the decoding.

  • since 3.0
val to_list : ?idx:int -> t -> uchar list

List of unicode codepoints.

  • parameter idx

    offset where to start the decoding.

val fold : ?idx:int -> ( 'a -> uchar -> 'a ) -> 'a -> t -> 'a
val iter : ?idx:int -> ( uchar -> unit ) -> t -> unit
val n_chars : t -> int

Number of characters.

val n_bytes : t -> int

Number of bytes.

val map : ( uchar -> uchar ) -> t -> t
val filter_map : ( uchar -> uchar option ) -> t -> t
val flat_map : ( uchar -> t ) -> t -> t
val empty : t

Empty string.

  • since 3.5
val append : t -> t -> t

Append two string together.

val concat : t -> t list -> t

concat sep l concatenates each string in l, inserting sep in between each string. Similar to String.concat.

val of_uchar : uchar -> t

of_char c is a string with only one unicode char in it.

  • since 3.5
val make : int -> uchar -> t

make n c makes a new string with n copies of c in it.

  • since 3.5
val of_seq : uchar Stdlib.Seq.t -> t

Build a string from unicode codepoints Renamed from of_std_seq since 3.0.

  • since 3.0
val of_iter : uchar iter -> t

Build a string from unicode codepoints

  • since 2.8
val uchar_to_bytes : uchar -> char iter

Translate the unicode codepoint to a list of utf-8 bytes. This can be used, for example, in combination with Buffer.add_char on a pre-allocated buffer to add the bytes one by one (despite its name, Buffer.add_char takes individual bytes, not unicode codepoints).

  • since 3.2
val of_gen : uchar gen -> t
val of_list : uchar list -> t
val of_string_exn : string -> t

Validate string by checking it is valid UTF8.

  • raises Invalid_argument

    if the string is not valid UTF8.

val of_string : string -> t option

Safe version of of_string_exn.

val is_valid : string -> bool

Valid UTF8?

val unsafe_of_string : string -> t

Conversion from a string without validating. CAUTION this is unsafe and can break all the other functions in this module. Use only if you're sure the string is valid UTF8. Upon iteration, if an invalid substring is met, Malformed will be raised.