Hi,
for our project, we have to implement a custom query language that does
have much in common with the built-in Lucene query language. We have a
formal grammar for that language, formalized with Antlr.
I am not sure about the best way to build/generate a Lucene-based
QueryParser object that is pluggable into our project because some of
the query language's properties refer to information we have stored in
payloads, i.e. require SpanQueries. Unfortunately, it is not as simple
as calling a SpanTermQuery because we would like to allows queries for
e.g. tokens that have the same payload, but not specified in advance.
Ideally, I would like to apply a typical Lucene query processing step as in:
StandardQueryParser parser = new StandardQueryParser(new
WhitespaceAnalyzer(Version.LUCENE_40));
Query q = parser.parse("text", query);
>From that point of view, the only change should be
CustomParser parser = new CustomParser(...);
Unfortunately, I couldn't find much documentation on that. The "Lucene
in Action" textbook refers to building custom query parsers with Antlr
or JavaCC, but does not go into any details. The Lucene query syntax
definition in JavaCC would probably be a valuable source, but going
through that is very tedious. That is why I would like to know whether
you might know of a tutorial or less complex examples.
Thank you very much!
Carsten Schnober
--
Institut für Deutsche Sprache | http://www.ids-mannheim.de
Projekt KorAP | http://korap.ids-mannheim.de
Tel. +49-(0)621-43740789 | schno...@ids-mannheim.de
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