Initial revision

lang/cem/cpp.ansi/class.h

@@ -0,0 +1,48 @@
+/*
+ * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
+ * See the copyright notice in the ACK home directory, in the file "Copyright".
+ */
+/* $Header$ */
+/* U S E   O F   C H A R A C T E R   C L A S S E S */
+
+/*	As a starter, chars are divided into classes, according to which
+	token they can be the start of.
+	At present such a class number is supposed to fit in 4 bits.
+*/
+
+#define	class(ch)	((tkclass)[ch])
+
+/*	Being the start of a token is, fortunately, a mutual exclusive
+	property, so, as there are less than 16 classes they can be
+	packed in 4 bits.
+*/
+
+#define	STSKIP	0	/* spaces and so on: skipped characters		*/
+#define	STNL	1	/* newline character(s): update linenumber etc.	*/
+#define	STGARB	2	/* garbage ascii character: not allowed		*/
+#define	STSIMP	3	/* this character can occur as token		*/
+#define	STCOMP	4	/* this one can start a compound token		*/
+#define	STELL	5	/* wide character- or string- constant prefix	*/
+#define	STIDF	6	/* being the initial character of an identifier	*/
+#define	STCHAR	7	/* the starter of a character constant		*/
+#define	STSTR	8	/* the starter of a string			*/
+#define	STNUM	9	/* the starter of a numeric constant		*/
+#define	STEOI	10	/* End-Of-Information mark			*/
+#define	STMSPEC	11	/* special class for token expansion		*/
+
+#define	NOEXPM	'\003'	/* don't expand the next macro identifier	*/
+#define	TOKSEP	'\004'	/* the token separator				*/
+
+/*	But occurring inside a token is not, so we need 1 bit for each
+	class.  This is implemented as a collection of tables to speed up
+	the decision whether a character has a special meaning.
+*/
+#define	in_idf(ch)	(inidf[ch])
+#define	is_oct(ch)	(isoct[ch])
+#define	is_dig(ch)	(isdig[ch])
+#define	is_hex(ch)	(ishex[ch])
+#define	is_suf(ch)	(issuf[ch])
+#define	is_wsp(ch)	(iswsp[ch])
+
+extern char tkclass[];
+extern char inidf[], isoct[], isdig[], ishex[], issuf[], iswsp[];