- From: Andy Seaborne <andy.seaborne@epimorphics.com>
- Date: Mon, 10 Dec 2012 10:51:36 +0000
- To: public-rdf-wg@w3.org
The issue raised is wanting to add to the useablity of grammar for LALR parser generators. Object lists do not have this problem because comma is a separator, and you can't have a trailing ",". As this useability rewrite is at odds with a grammar for top down (RC or LL) usage, we can't have both. Suggestion: Publish the grammar as it is in the LC version (which is the same as SPARQL 1.0) and also add a note for this rule that explains a way an LALR generator might be applied, quoting the rule below, aligned in names to the published grammar. On 08/12/12 15:53, Sandro Hawke wrote: > polist > : predicate olist > | polist SEMI > | polist SEMI predicate olist > ; We should note this a an expected shift/reduce conflict. See section 5.2 [1] of the bison manual for how that's hanlded in this rather common case. By default it does one token lookahead (AKA it behaves like an LL parser!). Andy [1] http://www.gnu.org/software/bison/manual/bison.html#Shift_002fReduce
Received on Monday, 10 December 2012 10:52:06 UTC