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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (c) 2005-2022, University of Amsterdam
SWI-Prolog Solutions b.v.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
:- module(unicode_data,
[ unicode_property/2 % ?Code, ?Property
]).
:- use_module(library(table)).
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This module provides access to the UNICODE datafile distributed by the
unicode organisation (http://www.unicode.org). This file describes many
aspects for all defined UNICODE code positions, such as their name,
type, etc. The meaning of the fields is defined here:
http://www.unicode.org/Public/UNIDATA/UCD.html#UCD_File_Format
This library uses the table package for accessing structured files. This
maps the file in memory and performs binary search. This is not blindly
fast and this library should therefore not be used for computationally
intensive tasks. In such cases it can be used to generate tables in
Prolog or even to create a dedicated C datastructure.
The file UnicodeData.txt itself is not part of the library and must be
obtained and installed separately. This is because of its size (close to
1MB). Increasing the footprint of the environment with 1MB is too much.
The UCD file must be named UnicodeData.txt and placed in the same
directory as this file or in the search path 'unicode' (see
file_search_path/2).
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
%! unicode_property(?Code, ?Property)
%
% Logical predicate relating code points to properties. It is
% optimised for asking a single property of a known code, but works
% with any instantiation.
unicode_property(Code, Property) :-
utable(Handle),
property(Property),
in_table(Handle, [code(Code), Property], _),
\+ arg(1, Property, '').
property(name(_)).
property(general_category(_)).
property(canonical_combining_class(_)).
property(bidi_class(_)).
property(decomposition_type(_)).
property(numeric_type_1(_)).
property(numeric_type_2(_)).
property(numeric_type_3(_)).
property(bidi_mirrored(_)).
property(unicode_1_name(_)).
property(iso_comment(_)).
property(simple_uppercase_mapping(_)).
property(simple_lowercase_mapping(_)).
property(simple_titlecase_mapping(_)).
:- dynamic
handle/1.
:- volatile
handle/1.
:- multifile
user:file_search_path/2.
:- dynamic
user:file_search_path/2.
:- ( user:file_search_path(unicode, _)
-> true
; prolog_load_context(directory, Dir),
assert(user:file_search_path(unicode, Dir))
).
utable(Handle) :-
handle(Handle),
!.
utable(Handle) :-
absolute_file_name(unicode('UnicodeData.txt'),
Path,
[ access(read)
]),
new_table(Path,
[ code(hexadecimal, [sorted, unique]),
name(atom, [downcase]), % 1
general_category(atom), % 2
canonical_combining_class(integer), % 3
bidi_class(atom, [downcase]), % 4
decomposition_type(atom), % 5
numeric_type_1(integer, [syntax]), % 6
numeric_type_2(integer, [syntax]), % 7
numeric_type_3(integer, [syntax]), % 8
bidi_mirrored(atom, [downcase]), % 9
unicode_1_name(atom, [downcase]), % 10
iso_comment(atom), % 11
simple_uppercase_mapping(hexadecimal, [syntax]), % 12
simple_lowercase_mapping(hexadecimal, [syntax]), % 13
simple_titlecase_mapping(hexadecimal, [syntax]) % 14
],
[ field_separator(0';)
],
Handle),
assert(handle(Handle)).
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