- From: Seaborne, Andy <andy.seaborne@hp.com>
- Date: Mon, 19 Feb 2007 11:06:49 +0000
- To: Eric Prud'hommeaux <eric@w3.org>
- CC: public-rdf-dawg@w3.org
I haven't had time to make sure Yacker is up-to-date. Last time I tried I ran into problems regenerating the parsers (I emailed you the details). (Aside: what are the quoting rules exactly? and what is @pass exactly? I think I may have got these wrong in the past.) Comments are in NI/ANON in the version I have been using but you're right that comments don't belong in the syntax tree so talking about them in the grammar is a bit odd. That, coupled with the fact different tools handle comments in different ways, means I think it clearer to keep the comments out of explicit mention. Eric Prud'hommeaux wrote: > * Eric Prud'hommeaux <eric@w3.org> [2007-02-18 07:45+0100] >> * Eric Prud'hommeaux <eric@w3.org> [2007-02-18 07:24+0100] >>> This change has dropped out of the yacker SPARQL grammar. Any reason I >>> shouldn't put it back? >> Hmm, they're currently in the lexical production that produces no >> token >> @pass: [ \t\r\n]+ | '#' [^\r\n]* >> which is arguably better as they don't belong in the parse tree. >> >> The comment test below parses perfectly in the current grammar. > > That was testing the wrong version. *Now* it parses perfectly. > > The issue comes from how to model > > [82] NIL ::= '(' WS* ')' > [83] WS ::= #x20 | #x9 | #xD | #xA > [84] ANON ::= '[' WS* ']' > and > Comments in SPARQL queries take the form of '#', outside an IRI or > string, and continue to the end of line (marked by characters 0x0D > or 0x0A) or end of file if there is no end of line after the comment > marker. Comments are treated as white space. > > I took that to mean that WS *really* included "'#' [^\r\n]*" so I > ammended WS: It wasn't meant that way - "as is they were whitespace" (i.e. split tokens if necessary). > > [86] WS ::= #x20 | #x9 | #xD | #xA | '#' [^\r\n]* > > Trying to think up a better way to express this in rq25... > Perhaps an extra production? I prefer the previous alternative - not in the grammar. I will and find time to make sure everything is up-to-date. Andy
Received on Monday, 19 February 2007 11:07:00 UTC