Shinji, Great piece of work! Did I miss that bit in the AQL specs, or are you supporting some functions of your own, such as devide?
On Sun, Feb 5, 2012 at 7:53 AM, Shinji KOBAYASHI <skoba at moss.gr.jp> wrote: > Hi Seref, > > This is the demo site for AQBE dynamic query generation. > http://wako3.u-aizu.ac.jp:8080/aqbe/ > It is wonderful. > > Regards, > Shinji > > 2012/1/5 Seref Arikan <serefarikan at kurumsalteknoloji.com>: > > Thanks Shinji, > > In general, Antlr has some convenient features, infinite lookahead being > one > > of them. I've quickly checked, and Treetop does not seem to support left > > recursion either. So you must have modified the grammar to make it work. > > I'm referring to grammar rules such as > > A : A | B; > > > > Tom made the point earlier. At one point it would be good to unify > various > > AQL implementation experiences. I'll check out the papers. > > > > Best regards > > Seref > > > > > > > > On Thu, Jan 5, 2012 at 2:21 AM, Shinji KOBAYASHI <skoba at moss.gr.jp> > wrote: > >> > >> Hi Seref, > >> > >> My ADL parser does not include AQL parsing. > >> I used Treetop, which is an Ruby implementation of PEG/Packrat parsing > >> algorithm, > >> not LL/LR. PEG/Packrat parser algorithm was described in this paper. > >> http://bford.info/pub/lang/packrat-icfp02/ > >> > >> Antlr is an implementation of PEG parser by LL techniques. I do not > >> know Antlr so much. > >> > >> Packrat parser does not need to separate scanner/parser/lexer and is > >> capable to > >> infinite look ahead recursive. > >> > >> I do not know why are you parsing AQL, but this proceeding about > querying > >> EHR > >> by archetype might be helpful for your research. > >> http://web-ext.u-aizu.ac.jp/labs/sw-db/7108/71080109.pdf > >> > >> Best regards, > >> Shinji > >> > >> 2012/1/5 Seref Arikan <serefarikan at kurumsalteknoloji.com>: > >> > Greetings, > >> > The AQL grammar from the wiki has direct and indirect left recursion. > >> > Which > >> > means without changes in the grammar, LL parser generators (both > JavaCC > >> > and > >> > Anltr) can't generate parsers for this grammar. > >> > > >> > I'm curious if anybody has refactored this grammar for LL parser > >> > generators. > >> > Shinji? Your latest release includes an AQL parser does not it? Could > >> > you > >> > please share your method? I can always look at the code, but you'd > >> > probably > >> > save me time :) > >> > > >> > I'm interested in experiences of others too. > >> > > >> > > >> > Kind regards > >> > Seref > >> > > >> > > >> > _______________________________________________ > >> > openEHR-technical mailing list > >> > openEHR-technical at openehr.org > >> > http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-technical > >> > > >> _______________________________________________ > >> openEHR-technical mailing list > >> openEHR-technical at openehr.org > >> http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-technical > > > > > > > > _______________________________________________ > > openEHR-technical mailing list > > openEHR-technical at openehr.org > > http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-technical > > > _______________________________________________ > openEHR-technical mailing list > openEHR-technical at openehr.org > http://lists.chime.ucl.ac.uk/mailman/listinfo/openehr-technical > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openehr.org/mailman/private/openehr-technical_lists.openehr.org/attachments/20120205/d04f57bf/attachment.html>
