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 >
