Experimental Physics and
Industrial Control System

I am using seq-2.0.11 and base-3.14.8.2. The problem is that the SNL 
compiler complains about a syntax error when trying to compile this code:

  program dynamic
  string sysName;
  assign sysName to {};
  ss dyn {
      state dummy {
          when () {
          } state dummy
      }
  }

The message is:

  preprocessing ../dynamic.st
  converting dynamic.i
  syntax error: line no. 3 (../dynamic.st)
       definitions/declarations

Note that this is a stripped-down version of some (supposedly valid) example 
code from the manual, specifically the example on page 25. I also tried the 
new version 2.0.12 but the error is the same.

(BTW: why is the new version not mentioned on the slac page 
(http://www.slac.stanford.edu/comp/unix/package/epics/sequencer/)? Slac no 
longer maintains it?)

A quick look at the sources reveales that indeed the parser does not accept 
an empty list of assignments. This is easily fixed, see attached patch file 
which is against version 2.0.12.

Cheers
Ben
-- 
"Programming = Mathematics + Murphy's Law" (E.W.Dijkstra)

diff -rN -u old-sncseq-2.0.12/src/snc/snc.y new-sncseq-2.0.12/src/snc/snc.y
--- old-sncseq-2.0.12/src/snc/snc.y	2008-11-14 13:37:39.852664073 +0100
+++ new-sncseq-2.0.12/src/snc/snc.y	2008-11-14 13:37:40.176620220 +0100
@@ -145,6 +145,8 @@
 		/* assign <var name>[<n>] [to] <db name>; */
 |	ASSIGN NAME subscript to STRING SEMI_COLON { assign_subscr($2, $3, $5); }
 		/* assign <var name> [to] {<db name>, ... }; */
+|	ASSIGN NAME to L_BRACKET R_BRACKET SEMI_COLON
+			{ assign_list($2, 0); }
 |	ASSIGN NAME to L_BRACKET assign_list R_BRACKET SEMI_COLON
 			{ assign_list($2, $5); }
 ;

Replies:

Re: SNL compiler bug (and a fix) Andrew Johnson

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