Re: bison-1.50: how to parse apostrophe?

[Akim Demaille]

>>>>> "Jan" == Jan Nieuwenhuizen <address@hidden> writes:

Jan> In our grammar file, we have this expression:

Jan>     sup_quotes: '\'' { $$ = 1; } | sup_quotes '\'' { $$ ++; } ;

Jan> but bison-1.50 doesn't like it:

Could you confirm that the following patch works?  Thanks!

Index: ChangeLog
from  Akim Demaille  <address@hidden>

        * tests/regression.at Characters Escapes): New.
        * src/scan-gram.l (SC_ESCAPED_CHARACTER): Accept \' in strings and
        characters.
        Reported by Jan Nieuwenhuizen.

Index: THANKS
===================================================================
RCS file: /cvsroot/bison/bison/THANKS,v
retrieving revision 1.47
diff -u -u -r1.47 THANKS
--- THANKS 30 Sep 2002 12:27:31 -0000 1.47
+++ THANKS 11 Oct 2002 11:21:46 -0000
@@ -21,6 +21,7 @@
 Florian Krohm          address@hidden
 H. Merijn Brand                address@hidden
 Hans Aberg             address@hidden
+Jan Nieuwenhuizen       address@hidden
 Jesse Thilo            address@hidden
 Jim Meyering           address@hidden
 Juan Manuel Guerrero   address@hidden
Index: src/scan-gram.l
===================================================================
RCS file: /cvsroot/bison/bison/src/scan-gram.l,v
retrieving revision 1.24
diff -u -u -r1.24 scan-gram.l
--- src/scan-gram.l 12 Aug 2002 14:52:47 -0000 1.24
+++ src/scan-gram.l 11 Oct 2002 11:21:48 -0000
@@ -347,7 +347,7 @@
   \\r  obstack_1grow (&string_obstack, '\r');
   \\t  obstack_1grow (&string_obstack, '\t');
   \\v  obstack_1grow (&string_obstack, '\v');
-  \\[\\""]   obstack_1grow (&string_obstack, yytext[1]);
+  \\[\\""'']   obstack_1grow (&string_obstack, yytext[1]);
   \\(.|\n)     {
     LOCATION_PRINT (stderr, *yylloc);
     fprintf (stderr, _(": unrecognized escape: %s\n"), quote (yytext));
Index: tests/regression.at
===================================================================
RCS file: /cvsroot/bison/bison/tests/regression.at,v
retrieving revision 1.68
diff -u -u -r1.68 regression.at
--- tests/regression.at 5 Oct 2002 04:50:45 -0000 1.68
+++ tests/regression.at 11 Oct 2002 11:21:48 -0000
@@ -333,6 +333,32 @@
 
 
 
+## -------------------- ##
+## Characters Escapes.  ##
+## -------------------- ##
+
+
+AT_SETUP([Characters Escapes])
+
+AT_DATA([input.y],
+[%{
+void yyerror (const char *s);
+int yylex (void);
+%}
+[%%
+exp:
+  '\'' "\'"
+| '\"' "\""
+| '"'  "'"
+;
+]])
+
+AT_CHECK([bison input.y -o input.c])
+AT_COMPILE([input.o], [-c input.c])
+AT_CLEANUP
+
+
+
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