Re: FYI: {...} without actions

[Akim Demaille]

The following message is a courtesy copy of an article
that has been posted to epita.cours.compile as well.


I forgot the CC, sorry for the duplicate.

Index: ChangeLog
from  Akim Demaille  <address@hidden>

        * src/scan-gram.l: Be robust to BRACED_CODE appearing before any
        rule.
        Reported by Mickael Labau.
        * tests/input.at (Torturing the Scanner): Test it.

Index: THANKS
===================================================================
RCS file: /cvsroot/bison/bison/THANKS,v
retrieving revision 1.62
diff -u -r1.62 THANKS
--- THANKS 13 Oct 2005 10:13:23 -0000 1.62
+++ THANKS 3 Apr 2006 13:49:50 -0000
@@ -45,6 +45,7 @@
 Matt Kraai                address@hidden
 Matt Rosing               address@hidden
 Michael Hayes             address@hidden
+Mickael Labau             address@hidden
 Mike Castle               address@hidden
 Neil Booth                address@hidden
 Nelson H. F. Beebe        address@hidden
Index: src/scan-gram.l
===================================================================
RCS file: /cvsroot/bison/bison/src/scan-gram.l,v
retrieving revision 1.85
diff -u -r1.85 scan-gram.l
--- src/scan-gram.l 30 Jan 2006 07:25:59 -0000 1.85
+++ src/scan-gram.l 3 Apr 2006 13:49:50 -0000
@@ -292,7 +292,7 @@

   /* Code in between braces.  */
   "{" {
-    if (current_rule->action)
+    if (current_rule && current_rule->action)
       grammar_midrule_action ();
     STRING_GROW;
     token_type = BRACED_CODE;
Index: tests/input.at
===================================================================
RCS file: /cvsroot/bison/bison/tests/input.at,v
retrieving revision 1.42
diff -u -r1.42 input.at
--- tests/input.at 30 Jan 2006 09:00:40 -0000 1.42
+++ tests/input.at 3 Apr 2006 13:49:51 -0000
@@ -204,6 +204,14 @@
 ]])


+AT_DATA([input.y], 
+[{}
+])
+AT_CHECK([bison input.y], [1], [],
+[[input.y:1.1-2: syntax error, unexpected {...}
+]])
+
+
 AT_DATA_GRAMMAR([input.y],
 [[%{
 /* This is seen in GCC: a %{ and %} in middle of a comment. */