uniname.pl

/*  Part of SWI-Prolog

    Author:        Jan Wielemaker
    E-mail:        jan@swi-prolog.org
    WWW:           https://www.swi-prolog.org
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*/

:- module(uniname,
          [ unicode_name/2             % ?CodePoint, ?Name
          ]).
:- use_foreign_library(foreign(uniname4pl)).

/** <module> Unicode character names

This library relates  Unicode  code  points   to  their  formal  Unicode
character names (the `Name` property of `UnicodeData.txt`). It ships its
own compact UCD-derived table  (about  360   KB)  and  is independent of
library(unicode) and library(unicode_security).

Algorithmic name ranges (Hangul syllables, CJK and Tangut ideographs and
the various ``PREFIX-<hex>`` families)  are   synthesised  from the code
point and carry no per-code-point storage;   the remaining ~34,600 names
are stored as a shared  word  table   plus  a  packed  token stream. See
``etc/gen_uniname.pl`` in the package directory  to regenerate the table
on a Unicode-version bump.
*/

%!  unicode_name(?CodePoint:integer, ?Name:atom) is nondet.
%
%   True when Name is the Unicode character name of CodePoint.  Usage:
%
%     - `unicode_name(+CodePoint, -Name)` is semidet: the name of
%       CodePoint, failing when it has none (control, surrogate,
%       private-use or unassigned code points).
%     - `unicode_name(-CodePoint, +Name)` is semidet: the (unique)
%       code point with the given name.
%     - `unicode_name(-CodePoint, -Name)` is nondet: enumerate every
%       named code point on backtracking.
%
%   Name is an atom of the formal Unicode name in upper case, e.g.
%
%   ```
%   ?- unicode_name(0'A, N).
%   N = 'LATIN CAPITAL LETTER A'.
%
%   ?- unicode_name(C, 'EURO SIGN').
%   C = 8364.
%
%   ?- unicode_name(0xAC00, N).
%   N = 'HANGUL SYLLABLE GA'.
%   ```