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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015 *)
(* \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
(** This exception is raised when UTF-8 the input string contains unsupported UTF-8 characters. *)
exception Unsupported
(** Classify a unicode char into 3 classes.
@raise Unsupported if the input string contains unsupported UTF-8 characters. *)
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.
@raise Unsupported if the input string contains unsupported UTF-8 characters. *)
val ident_refutation : string -> (bool * string) option
(** First char of a string, converted to lowercase
@raise Unsupported if the input string contains unsupported UTF-8 characters.
@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.
Those UTF-8 characters which do not have their ASCII counterparts are
translated to ["__Uxxxx_"] where {i xxxx} are four hexadecimal digits.
@raise Unsupported if the input string contains unsupported UTF-8 characters. *)
val ascii_of_ident : string -> string
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