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ensure that a negative clause is not first or only in list

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This commit is contained in:
dockes 2008-08-28 15:42:43 +00:00
parent 84feafdf74
commit 34864f159a
1 changed files with 25 additions and 2 deletions
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27
src/rcldb/searchdata.cpp
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@ -1,5 +1,5 @@
#ifndef lint
static char rcsid[] = "@(#$Id: searchdata.cpp,v 1.21 2008-01-16 11:14:38 dockes Exp $ (C) 2006 J.F.Dockes";
static char rcsid[] = "@(#$Id: searchdata.cpp,v 1.22 2008-08-28 15:42:43 dockes Exp $ (C) 2006 J.F.Dockes";
#endif
/*
* This program is free software; you can redistribute it and/or modify
@ -48,6 +48,28 @@ bool SearchData::toNativeQuery(Rcl::Db &db, void *d, const string& stemlang)
Xapian::Query xq;
m_reason.erase();
if (m_query.size() < 1) {
m_reason = "empty query";
return false;
}
// It's not allowed to have a pure negative query and also it
// seems that Xapian doesn't like the first element to be AND_NOT
qlist_it_t itnotneg = m_query.end();
for (qlist_it_t it = m_query.begin(); it != m_query.end(); it++) {
if ((*it)->m_tp != SCLT_EXCL) {
itnotneg = it;
break;
}
}
if (itnotneg == m_query.end()) {
LOGERR(("SearchData::toNativeQuery: can't have all negative clauses"));
m_reason = "Can't have only negative clauses";
return false;
}
if ((*m_query.begin())->m_tp == SCLT_EXCL)
iter_swap(m_query.begin(), itnotneg);
// Walk the clause list translating each in turn and building the
// Xapian query tree
for (qlist_it_t it = m_query.begin(); it != m_query.end(); it++) {
@ -59,7 +81,8 @@ bool SearchData::toNativeQuery(Rcl::Db &db, void *d, const string& stemlang)
}
// If this structure is an AND list, must use AND_NOT for excl clauses.
// Else this is an OR list, and there can't be excl clauses
// Else this is an OR list, and there can't be excl clauses (checked by
// addClause())
Xapian::Query::op op;
if (m_tp == SCLT_AND) {
op = (*it)->m_tp == SCLT_EXCL ?