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1 | (* CharClass.mod implement the ISO CharClass specification. |
2 | ||
a945c346 | 3 | Copyright (C) 2002-2024 Free Software Foundation, Inc. |
1eee94d3 GM |
4 | Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>. |
5 | ||
6 | This file is part of GNU Modula-2. | |
7 | ||
8 | GNU Modula-2 is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GNU Modula-2 is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | Under Section 7 of GPL version 3, you are granted additional | |
19 | permissions described in the GCC Runtime Library Exception, version | |
20 | 3.1, as published by the Free Software Foundation. | |
21 | ||
22 | You should have received a copy of the GNU General Public License and | |
23 | a copy of the GCC Runtime Library Exception along with this program; | |
24 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
25 | <http://www.gnu.org/licenses/>. *) | |
26 | ||
27 | IMPLEMENTATION MODULE CharClass ; | |
28 | ||
29 | FROM ASCII IMPORT lf, cr, tab ; | |
30 | ||
31 | (* Classification of values of the type CHAR *) | |
32 | ||
33 | (* Returns TRUE if and only if ch is classified as a numeric character *) | |
34 | ||
35 | PROCEDURE IsNumeric (ch: CHAR) : BOOLEAN ; | |
36 | BEGIN | |
37 | RETURN (ch>='0') AND (ch<='9') | |
38 | END IsNumeric ; | |
39 | ||
40 | ||
41 | (* Returns TRUE if and only if ch is classified as a letter *) | |
42 | ||
43 | PROCEDURE IsLetter (ch: CHAR): BOOLEAN; | |
44 | BEGIN | |
45 | RETURN ((ch>='a') AND (ch<='z')) OR ((ch>='A') AND (ch<='Z')) | |
46 | END IsLetter ; | |
47 | ||
48 | ||
49 | (* Returns TRUE if and only if ch is classified as an upper case letter *) | |
50 | ||
51 | PROCEDURE IsUpper (ch: CHAR): BOOLEAN; | |
52 | BEGIN | |
53 | RETURN (ch>='A') AND (ch<='Z') | |
54 | END IsUpper ; | |
55 | ||
56 | ||
57 | (* Returns TRUE if and only if ch is classified as a lower case letter *) | |
58 | ||
59 | PROCEDURE IsLower (ch: CHAR): BOOLEAN; | |
60 | BEGIN | |
61 | RETURN (ch>='a') AND (ch<='z') | |
62 | END IsLower ; | |
63 | ||
64 | ||
65 | (* Returns TRUE if and only if ch represents a control function *) | |
66 | ||
67 | PROCEDURE IsControl (ch: CHAR): BOOLEAN; | |
68 | BEGIN | |
69 | RETURN (ch<' ') | |
70 | END IsControl ; | |
71 | ||
72 | ||
73 | (* Returns TRUE if and only if ch represents a space character or a format effector *) | |
74 | ||
75 | PROCEDURE IsWhiteSpace (ch: CHAR): BOOLEAN; | |
76 | BEGIN | |
77 | RETURN (ch=' ') OR (ch=cr) OR (ch=lf) OR (ch=tab) | |
78 | END IsWhiteSpace ; | |
79 | ||
80 | ||
81 | END CharClass. |