[Xapian-discuss] Prefixes

[Fabrice Colin]

Hi all,

I am using QueryParser::add_boolean_prefix("url", "U") to restrict searches to
documents that have a specific URL.
When the input has a URL containing a space, how should it be quoted ?

For instance, the input url:"file:///some/where/a file" will generate the terms
"U"file:///some/where/a" and "file", and url:'file:///some/where/a
file' will generate
"U'file:///some/where/a" and "file".

I also found that url:'file:///some/where/a file.txt' will generate the terms
"U'file:///some/where/a", "file" and "txt", and not just
"U'file:///some/where/a", "file.txt".
Of course url:file:///some/where/afile.txt only generates
Ufile:///some/where/afile.txt.

This leads me to a second question. At indexing time, long URLs are hashed just
like what omindex does with hash_long_term(). Because of this, the QueryParser
will always generate the wrong term when its input has a filter on one of these
long URLs. Would it be possible to have something like the following ?

void Xapian::QueryParser::add_boolean_prefix(
const std::string &field,
const std::string &prefix,
const TermTransformer *transform);

where transform is a functor that is passed the term the QueryParser extracted
from the input for the given field and modifies that term before the QueryParser
builds the query.

Fabrice