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(* CharClass.mod implement the ISO CharClass specification.
Copyright (C) 2002-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE CharClass ;
FROM ASCII IMPORT lf, cr, tab ;
(* Classification of values of the type CHAR *)
(* Returns TRUE if and only if ch is classified as a numeric character *)
PROCEDURE IsNumeric (ch: CHAR) : BOOLEAN ;
BEGIN
RETURN (ch>='0') AND (ch<='9')
END IsNumeric ;
(* Returns TRUE if and only if ch is classified as a letter *)
PROCEDURE IsLetter (ch: CHAR): BOOLEAN;
BEGIN
RETURN ((ch>='a') AND (ch<='z')) OR ((ch>='A') AND (ch<='Z'))
END IsLetter ;
(* Returns TRUE if and only if ch is classified as an upper case letter *)
PROCEDURE IsUpper (ch: CHAR): BOOLEAN;
BEGIN
RETURN (ch>='A') AND (ch<='Z')
END IsUpper ;
(* Returns TRUE if and only if ch is classified as a lower case letter *)
PROCEDURE IsLower (ch: CHAR): BOOLEAN;
BEGIN
RETURN (ch>='a') AND (ch<='z')
END IsLower ;
(* Returns TRUE if and only if ch represents a control function *)
PROCEDURE IsControl (ch: CHAR): BOOLEAN;
BEGIN
RETURN (ch<' ')
END IsControl ;
(* Returns TRUE if and only if ch represents a space character or a format effector *)
PROCEDURE IsWhiteSpace (ch: CHAR): BOOLEAN;
BEGIN
RETURN (ch=' ') OR (ch=cr) OR (ch=lf) OR (ch=tab)
END IsWhiteSpace ;
END CharClass.
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