alx/mu4e
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

query-parser: special-case wildcards

Browse Source 
We were transforming wild-card searches into regular-expression
searches; while that works, it's also significantly slower.

So, instead, special-case wildcards, and use the Xapian machinery for
wildcard queries.
This commit is contained in:
djcb
2018-05-18 15:55:40 +03:00
parent 84376b4aa7
commit 6290e4ad9a
2 changed files with 16 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
lib/parser/xapian.cc
View File

@ -48,18 +48,30 @@ xapian_query_op (const Mux::Tree& tree)
return Xapian::Query(op, childvec.begin(), childvec.end());
}
static Xapian::Query
maybe_wildcard (const Value* val, const std::string& str)
{
const auto vlen = str.length();
if (vlen <= 1 || str[vlen-1] != '*')
return Xapian::Query(val->prefix + str);
else
return Xapian::Query(Xapian::Query::OP_WILDCARD,
val->prefix + str.substr(0, vlen-1));
}
static Xapian::Query
xapian_query_value (const Mux::Tree& tree)
{
const auto v = dynamic_cast<Value*> (tree.node.data.get());
if (!v->phrase)
return Xapian::Query(v->prefix + v->value);
return maybe_wildcard(v, v->value);
const auto parts = split (v->value, " ");
std::vector<Xapian::Query> phvec;
for (const auto p: parts)
phvec.push_back(Xapian::Query(v->prefix + p));
phvec.emplace_back(maybe_wildcard(v, p));
if (parts.empty())
return Xapian::Query::MatchNothing; // shouldn't happen