Erik Hatcher wrote:
It doesn't seem like you need a "parser" at all for your field-specific
search fields. Simply tokenize, using a Lucene Analyzer, the text field
and build up a BooleanQuery of all the tokens.
That's what I'm currently doing, but I was getting bogged down with trying to
support PhraseQueries in case of quoted input. My knowledge of JavaCC is
limited, so I was trying to weigh up the effor of rolling my own or adapting QP.
QueryParser is over prescribed - and is often not the best fit for the
job. It's only a few lines of code to tokenize (look at the QueryParser
code in how it creates a PhraseQuery, for example) and build a Query
from the tokens.
If you need to support +/-/AND/OR syntax in your field-specific inputs
that's a different story - though your example does not show this need.
If so, copying the QueryParser.jj file and removing the "field:" syntax
and fixing all created Query objects to a specified single field might
be the trick.
I do have other levels where +- can be used, but that's the easy bit and I'm
just constructing an outer BooleanQuery. Anyway, I'll have a go with QP.jj and
see where I get. BTW, LIA is an excellent book!
Thanks everyone for your comments.
Antony
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