2 * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
3 * See the copyright notice in the ACK home directory, in the file "Copyright".
5 /* $Id: class.h,v 1.3 1994/06/24 11:36:50 ceriel Exp $ */
6 /* U S E O F C H A R A C T E R C L A S S E S */
8 /* As a starter, chars are divided into classes, according to which
9 token they can be the start of.
10 At present such a class number is supposed to fit in 4 bits.
13 #define class(ch) ((tkclass)[ch])
15 /* Being the start of a token is, fortunately, a mutual exclusive
16 property, so, as there are less than 16 classes they can be
20 #define STSKIP 0 /* spaces and so on: skipped characters */
21 #define STNL 1 /* newline character(s): update linenumber etc. */
22 #define STGARB 2 /* garbage ascii character: not allowed */
23 #define STSIMP 3 /* this character can occur as token */
24 #define STCOMP 4 /* this one can start a compound token */
25 #define STELL 5 /* wide character- or string- constant prefix */
26 #define STIDF 6 /* being the initial character of an identifier */
27 #define STCHAR 7 /* the starter of a character constant */
28 #define STSTR 8 /* the starter of a string */
29 #define STNUM 9 /* the starter of a numeric constant */
30 #define STEOI 10 /* End-Of-Information mark */
31 #define STMSPEC 11 /* special class for token expansion */
33 #define NOEXPM '\003' /* don't expand the next macro identifier */
34 #define TOKSEP '\004' /* the token separator */
36 /* But occurring inside a token is not, so we need 1 bit for each
37 class. This is implemented as a collection of tables to speed up
38 the decision whether a character has a special meaning.
40 #define in_idf(ch) (inidf[ch])
41 #define is_oct(ch) (isoct[ch])
42 #define is_dig(ch) (isdig[ch])
43 #define is_hex(ch) (ishex[ch])
44 #define is_wsp(ch) (iswsp[ch])
46 extern char tkclass[];
47 extern char inidf[], isoct[], isdig[], ishex[], iswsp[];