[src/trunk]: src/usr.bin/config Recognize {if{, n}def, elfif{, n}def, else, endif}...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d66ff4ec529c
branches:  trunk
changeset: 745609:d66ff4ec529c
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Mar 08 00:04:11 2020 +0000

description:
Recognize {if{,n}def,elfif{,n}def,else,endif} only at the beginning of the
line or after whitespace.

diffstat:

 usr.bin/config/scan.l |  17 +++++++++--------
 1 files changed, 9 insertions(+), 8 deletions(-)

diffs (81 lines):

diff -r 6c886b6c60cc -r d66ff4ec529c usr.bin/config/scan.l
--- a/usr.bin/config/scan.l     Sat Mar 07 23:20:19 2020 +0000
+++ b/usr.bin/config/scan.l     Sun Mar 08 00:04:11 2020 +0000
@@ -1,5 +1,5 @@
 %{
-/*     $NetBSD: scan.l,v 1.28 2020/03/07 22:35:16 christos Exp $       */
+/*     $NetBSD: scan.l,v 1.29 2020/03/08 00:04:11 christos Exp $       */
 
 /*
  * Copyright (c) 1992, 1993
@@ -42,7 +42,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: scan.l,v 1.28 2020/03/07 22:35:16 christos Exp $");
+__RCSID("$NetBSD: scan.l,v 1.29 2020/03/08 00:04:11 christos Exp $");
 
 #include <sys/param.h>
 #include <errno.h>
@@ -107,6 +107,7 @@
 WORD   [A-Za-z_][-A-Za-z_0-9]*
 FILENAME       ({PATH}|{QCHARS})
 RESTOFLINE     [ \t]*(#[^\n]*)?\n
+WS     ^[ \t]*
 
 %x     IGNORED
 
@@ -169,7 +170,7 @@
 \+=            return PLUSEQ;
 :=             return COLONEQ;
 
-<*>ifdef[ \t]+{WORD}{RESTOFLINE} {
+<*>{WS}ifdef[ \t]+{WORD}{RESTOFLINE} {
                ifdefstate <<= IDS_SHIFT;
                if (++ifdefshift >= IDS_MAX_DEPTH) {
                        yyerror("too many levels of conditional");
@@ -183,7 +184,7 @@
                yyline++;
        }
 
-<*>ifndef[ \t]+{WORD}{RESTOFLINE} {
+<*>{WS}ifndef[ \t]+{WORD}{RESTOFLINE} {
                ifdefstate <<= IDS_SHIFT;
                if (++ifdefshift >= IDS_MAX_DEPTH) {
                        yyerror("too many levels of conditional");
@@ -198,7 +199,7 @@
        }
 
 
-<*>elifdef[ \t]+{WORD}{RESTOFLINE} {
+<*>{WS}elifdef[ \t]+{WORD}{RESTOFLINE} {
                int st = ifdefstate & IDS_BITS;
                if (ifdefshift == -1 || (st & IDS_ELSE) != 0) {
                        yyerror("mismatched elifdef");
@@ -213,7 +214,7 @@
                yyline++;
        }
 
-<*>elifndef[ \t]+{WORD}{RESTOFLINE} {
+<*>{WS}elifndef[ \t]+{WORD}{RESTOFLINE} {
                int st = ifdefstate & IDS_BITS;
                if (ifdefshift == -1 || (st & IDS_ELSE) != 0) {
                        yyerror("mismatched elifndef");
@@ -228,7 +229,7 @@
                yyline++;
        }
 
-<*>else{RESTOFLINE} {
+<*>{WS}else{RESTOFLINE} {
                int st = ifdefstate & IDS_BITS;
                if (ifdefshift == -1 || (st & IDS_ELSE) != 0) {
                        yyerror("mismatched else");
@@ -243,7 +244,7 @@
                yyline++;
        }
 
-<*>endif{RESTOFLINE} {
+<*>{WS}endif{RESTOFLINE} {
                if (ifdefshift == -1) {
                        yyerror("mismatched endif");
                }