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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(** Unicode utilities *)
type status = Letter | IdentPart | Symbol | Unknown
(** Classify a unicode char into 3 classes or unknown. *)
val classify : int -> status
(** Return [None] if a given string can be used as a (Coq) identifier.
Return [Some (b,s)] otherwise, where [s] is an explanation and [b] is severity. *)
val ident_refutation : string -> (bool * string) option
(** First char of a string, converted to lowercase
@raise Assert_failure if the input string is empty. *)
val lowercase_first_char : string -> string
(** Return [true] if all UTF-8 characters in the input string are just plain
ASCII characters. Returns [false] otherwise. *)
val is_basic_ascii : string -> bool
(** [ascii_of_ident s] maps UTF-8 string to a string composed solely from ASCII
characters. The non-ASCII characters are translated to ["_UUxxxx_"] where
{i xxxx} is the Unicode index of the character in hexadecimal (from four
to six hex digits). To avoid potential name clashes, any preexisting
substring ["_UU"] is turned into ["_UUU"]. *)
val ascii_of_ident : string -> string
(** Validate an UTF-8 string *)
val is_utf8 : string -> bool
(** Return the length of a valid UTF-8 string. *)
val utf8_length : string -> int
(** Variant of {!String.sub} for UTF-8 strings. *)
val utf8_sub : string -> int -> int -> string
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