Xapian::Query XapianEngine::parseQuery(Xapian::Database *pIndex, const QueryProperties &queryProps,
const string &stemLanguage, DefaultOperator defaultOperator,
const string &limitQuery, string &correctedFreeQuery, bool minimal)
{
Xapian::QueryParser parser;
CJKVTokenizer tokenizer;
string freeQuery(queryProps.getFreeQuery());
unsigned int tokensCount = 1;
bool diacriticSensitive = queryProps.getDiacriticSensitive();
// Modifying the query is necessary if it's CJKV or diacritics are off
if ((tokenizer.has_cjkv(freeQuery) == true) ||
(diacriticSensitive == false))
{
QueryModifier handler(freeQuery,
diacriticSensitive,
tokenizer.get_ngram_size());
tokenizer.tokenize(freeQuery, handler, true);
tokensCount = handler.get_tokens_count();
// We can disable stemming and spelling correction for pure CJKV queries
string cjkvQuery(handler.get_modified_query(minimal));
#ifdef DEBUG
cout << "XapianEngine::parseQuery: CJKV query is " << cjkvQuery << endl;
#endif
// Do as if the user had given this as input
freeQuery = cjkvQuery;
}
else
{
string::size_type spacePos = freeQuery.find(' ');
while (spacePos != string::npos)
{
++tokensCount;
if (spacePos + 1 >= freeQuery.length())
{
break;
}
// Next
spacePos = freeQuery.find(' ', spacePos + 1);
}
}
#ifdef DEBUG
cout << "XapianEngine::parseQuery: " << tokensCount << " tokens" << endl;
#endif
if (pIndex != NULL)
{
// The database is required for wildcards and spelling
parser.set_database(*pIndex);
}
// Set things up
if ((minimal == false) &&
(stemLanguage.empty() == false))
{
parser.set_stemmer(m_stemmer);
parser.set_stemming_strategy(Xapian::QueryParser::STEM_SOME);
// Don't bother loading the stopwords list if there's only one token
if (tokensCount > 1)
{
FileStopper *pStopper = FileStopper::get_stopper(Languages::toCode(stemLanguage));
if ((pStopper != NULL) &&
(pStopper->get_stopwords_count() > 0))
{
parser.set_stopper(pStopper);
}
}
}
else
{
#ifdef DEBUG
cout << "XapianEngine::parseQuery: no stemming" << endl;
#endif
parser.set_stemming_strategy(Xapian::QueryParser::STEM_NONE);
}
// What's the default operator ?
if (defaultOperator == DEFAULT_OP_AND)
{
parser.set_default_op(Xapian::Query::OP_AND);
}
else
{
parser.set_default_op(Xapian::Query::OP_OR);
}
#if XAPIAN_NUM_VERSION >= 1000004
// Search across text body and title
parser.add_prefix("", "");
parser.add_prefix("", "S");
#endif
// X prefixes should always include a colon
parser.add_boolean_prefix("site", "H");
parser.add_boolean_prefix("file", "P");
parser.add_boolean_prefix("ext", "XEXT:");
parser.add_prefix("title", "S");
parser.add_boolean_prefix("url", "U");
parser.add_boolean_prefix("dir", "XDIR:");
parser.add_boolean_prefix("inurl", "XFILE:");
parser.add_prefix("path", "XPATH:");
parser.add_boolean_prefix("lang", "L");
parser.add_boolean_prefix("type", "T");
parser.add_boolean_prefix("class", "XCLASS:");
parser.add_boolean_prefix("label", "XLABEL:");
parser.add_boolean_prefix("tokens", "XTOK:");
// Any limit on what documents should be searched ?
if (limitQuery.empty() == false)
{
string limitedQuery(limitQuery);
limitedQuery += " AND ( ";
limitedQuery += freeQuery;
limitedQuery += " )";
freeQuery = limitedQuery;
#ifdef DEBUG
cout << "XapianEngine::parseQuery: " << freeQuery << endl;
#endif
}
// Date range
Xapian::DateValueRangeProcessor dateProcessor(0);
parser.add_valuerangeprocessor(&dateProcessor);
// Size with a "b" suffix, ie 1024..10240b
#if XAPIAN_NUM_VERSION >= 1001000
Xapian::NumberValueRangeProcessor sizeProcessor(2, "b", false);
parser.add_valuerangeprocessor(&sizeProcessor);
#elif XAPIAN_NUM_VERSION >= 1000002
// Xapian 1.02 is the bare minimum
Xapian::v102::NumberValueRangeProcessor sizeProcessor(2, "b", false);
parser.add_valuerangeprocessor(&sizeProcessor);
#endif
// Time range
TimeValueRangeProcessor timeProcessor(3);
parser.add_valuerangeprocessor(&timeProcessor);
// What type of query is this ?
QueryProperties::QueryType type = queryProps.getType();
if (type != QueryProperties::XAPIAN_QP)
{
map<string, string> fieldMapping;
// Bare minimum mapping between Xesam fields and our prefixes
fieldMapping["dc:title"] = "S";
XapianQueryBuilder builder(parser, fieldMapping);
XesamParser *pParser = NULL;
bool parsedQuery = false;
// Get a Xesam parser
if (type == QueryProperties::XESAM_QL)
{
pParser = new XesamQLParser();
}
#ifdef HAVE_BOOST_SPIRIT_CORE_HPP
else if (type == QueryProperties::XESAM_UL)
{
pParser = new XesamULParser();
}
#endif
if (pParser != NULL)
{
parsedQuery = pParser->parse(freeQuery, builder);
delete pParser;
}
if (parsedQuery == true)
{
return builder.get_query();
}
return Xapian::Query();
}
// Do some pre-processing : look for filters with quoted values
string::size_type escapedFilterEnd = 0;
string::size_type escapedFilterStart = freeQuery.find(":\"");
while ((escapedFilterStart != string::npos) &&
(escapedFilterStart < freeQuery.length() - 2))
{
escapedFilterEnd = freeQuery.find("\"", escapedFilterStart + 2);
if (escapedFilterEnd == string::npos)
{
break;
}
string filterValue = freeQuery.substr(escapedFilterStart + 2, escapedFilterEnd - escapedFilterStart - 2);
if (filterValue.empty() == false)
{
string escapedValue(Url::escapeUrl(filterValue));
bool escapeValue = false, hashValue = false;
// The value should be escaped and length-limited as done at indexing time
checkFilter(freeQuery, escapedFilterStart, escapeValue, hashValue);
if (escapeValue == false)
{
// No escaping
escapedValue = filterValue;
}
if (hashValue == true)
{
// Partially hash if necessary
escapedValue = XapianDatabase::limitTermLength(escapedValue, true);
}
else
{
escapedValue = XapianDatabase::limitTermLength(escapedValue);
}
freeQuery.replace(escapedFilterStart + 1, escapedFilterEnd - escapedFilterStart,
escapedValue);
escapedFilterEnd = escapedFilterEnd + escapedValue.length() - filterValue.length();
}
else
{
// No value !
freeQuery.replace(escapedFilterStart, escapedFilterEnd - escapedFilterStart + 1, ":");
escapedFilterEnd -= 2;
}
#ifdef DEBUG
cout << "XapianEngine::parseQuery: replaced filter: " << freeQuery << endl;
#endif
// Next
escapedFilterStart = freeQuery.find(":\"", escapedFilterEnd);
}
// Parse the query string with all necessary options
unsigned int flags = Xapian::QueryParser::FLAG_BOOLEAN|Xapian::QueryParser::FLAG_PHRASE|
Xapian::QueryParser::FLAG_LOVEHATE|Xapian::QueryParser::FLAG_PURE_NOT;
if (minimal == false)
{
flags |= Xapian::QueryParser::FLAG_WILDCARD;
#if ENABLE_XAPIAN_SPELLING_CORRECTION>0
flags |= Xapian::QueryParser::FLAG_SPELLING_CORRECTION;
#endif
}
Xapian::Query parsedQuery = parser.parse_query(freeQuery, flags);
#ifdef DEBUG
cout << "XapianEngine::parseQuery: " << parsedQuery.get_description() << endl;
#endif
if (minimal == false)
{
#if ENABLE_XAPIAN_SPELLING_CORRECTION>0
// Any correction ?
correctedFreeQuery = parser.get_corrected_query_string();
#ifdef DEBUG
if (correctedFreeQuery.empty() == false)
{
cout << "XapianEngine::parseQuery: corrected spelling to: " << correctedFreeQuery << endl;
}
#endif
#endif
}
return parsedQuery;
}
void query(const std::vector<std::string>& arr_queries, const std::vector<std::string>& arr_selection = {}) {
Xapian::Database databases_ir;
try {
Xapian::Database database_ir_object_values(path_database+"object_values/");
databases_ir.add_database(database_ir_object_values);
} catch (const Xapian::Error &e) {
// Database not ready
}
try {
Xapian::Database database_ir_object_descriptions(path_database+"object_descriptions/");
databases_ir.add_database(database_ir_object_descriptions);
} catch (const Xapian::Error &e) {
// Database not ready
}
try {
Xapian::Database database_ir_object_sub_descriptions(path_database+"object_sub_descriptions/");
databases_ir.add_database(database_ir_object_sub_descriptions);
} catch (const Xapian::Error &e) {
// Database not ready
}
// Filter on Type IDs
Xapian::Query query_ir_identifiers;
if (!arr_selection.empty()) {
std::vector<Xapian::Query> arr_query_identifiers;
for (const auto& str_identifier_field : arr_selection) {
arr_query_identifiers.push_back(Xapian::Query("T"+str_identifier_field));
}
query_ir_identifiers = Xapian::Query(Xapian::Query::OP_OR, arr_query_identifiers.begin(), arr_query_identifiers.end());
}
Xapian::QueryParser queryparser;
queryparser.set_database(databases_ir); // Needed to enable specific query flags
queryparser.set_stemmer(Xapian::Stem("en"));
queryparser.set_stemming_strategy(queryparser.STEM_SOME);
queryparser.add_boolean_prefix("identifier", "T");
//queryparser.add_prefix("value", "SV");
unsigned int count_queries = 0;
for (const auto& str_query : arr_queries) {
const auto query_id = count_queries;
count_queries++;
Xapian::Query query_ir = queryparser.parse_query(str_query, Xapian::QueryParser::FLAG_DEFAULT | Xapian::QueryParser::FLAG_WILDCARD);
if (!arr_selection.empty()) {
// Update main query
query_ir = Xapian::Query(Xapian::Query::OP_FILTER, query_ir, query_ir_identifiers);
}
// Run query
Xapian::Enquire enquire(databases_ir);
enquire.set_query(query_ir);
Xapian::MSet arr_msets = enquire.get_mset(num_offset, num_limit);
for (Xapian::MSetIterator iterate_arr_mset = arr_msets.begin(); iterate_arr_mset != arr_msets.end(); iterate_arr_mset++) {
//Xapian::docid did = *iterate_arr_mset;
const int unsigned& nr_rank = iterate_arr_mset.get_rank();
const int unsigned& nr_weight = iterate_arr_mset.get_weight();
const Xapian::Document doc = iterate_arr_mset.get_document();
const std::string& str_identifier = doc.get_value(0);
if (map_query_results.find(str_identifier) == map_query_results.end()) {
std::vector<unsigned int> arr_matches;
arr_matches.push_back(query_id);
const std::string& str_value = (include_value ? doc.get_data() : "");
map_query_results[str_identifier] = std::make_tuple(nr_rank, nr_weight, arr_matches, str_value);
} else {
type_arr_query_result& arr_query_result = map_query_results[str_identifier];
std::get<0>(arr_query_result) += nr_rank;
std::get<1>(arr_query_result) += nr_weight;
std::get<2>(arr_query_result).push_back(query_id);
}
}
}
}
Xapian::Query XapianEngine::parseQuery(Xapian::Database *pIndex, const QueryProperties &queryProps,
const string &stemLanguage, bool followOperators)
{
string freeQuery(StringManip::replaceSubString(queryProps.getFreeQuery(), "\n", " "));
Xapian::QueryParser parser;
Xapian::Stem stemmer;
unsigned int minDay, minMonth, minYear = 0;
unsigned int maxDay, maxMonth, maxYear = 0;
// Set things up
if (stemLanguage.empty() == false)
{
stemmer = Xapian::Stem(StringManip::toLowerCase(stemLanguage));
parser.set_stemming_strategy(Xapian::QueryParser::STEM_ALL);
parser.set_stemmer(stemmer);
}
else
{
parser.set_stemming_strategy(Xapian::QueryParser::STEM_NONE);
}
if (followOperators == true)
{
parser.set_default_op(Xapian::Query::OP_AND);
}
else
{
parser.set_default_op(Xapian::Query::OP_OR);
}
if (pIndex != NULL)
{
// The database is required for wildcards
parser.set_database(*pIndex);
}
// ...including prefixes
// X prefixes should always include a colon
parser.add_boolean_prefix("site", "H");
parser.add_boolean_prefix("file", "P");
parser.add_boolean_prefix("ext", "XEXT:");
parser.add_boolean_prefix("title", "S");
parser.add_boolean_prefix("url", "U");
parser.add_boolean_prefix("dir", "XDIR:");
parser.add_boolean_prefix("lang", "L");
parser.add_boolean_prefix("type", "T");
parser.add_boolean_prefix("label", "XLABEL:");
// Do some pre-processing : look for filters with quoted values
string::size_type escapedFilterEnd = 0;
string::size_type escapedFilterStart = freeQuery.find(":\"");
while ((escapedFilterStart != string::npos) &&
(escapedFilterStart < freeQuery.length() - 2))
{
escapedFilterEnd = freeQuery.find("\"", escapedFilterStart + 2);
if (escapedFilterEnd == string::npos)
{
break;
}
string filterValue = freeQuery.substr(escapedFilterStart + 2, escapedFilterEnd - escapedFilterStart - 2);
if (filterValue.empty() == false)
{
string escapedValue(Url::escapeUrl(filterValue));
bool escapeValue = false, hashValue = false;
// The value should be escaped and length-limited as done at indexing time
checkFilter(freeQuery, escapedFilterStart, escapeValue, hashValue);
if (escapeValue == false)
{
// No escaping
escapedValue = filterValue;
}
if (hashValue == true)
{
// Partially hash if necessary
escapedValue = XapianDatabase::limitTermLength(escapedValue, true);
}
else
{
escapedValue = XapianDatabase::limitTermLength(escapedValue);
}
freeQuery.replace(escapedFilterStart + 1, escapedFilterEnd - escapedFilterStart,
escapedValue);
escapedFilterEnd = escapedFilterEnd + escapedValue.length() - filterValue.length();
}
else
{
// No value !
freeQuery.replace(escapedFilterStart, escapedFilterEnd - escapedFilterStart + 1, ":");
escapedFilterEnd -= 2;
}
#ifdef DEBUG
cout << "XapianEngine::parseQuery: replaced filter: " << freeQuery << endl;
#endif
// Next
escapedFilterStart = freeQuery.find(":\"", escapedFilterEnd);
}
// Activate all options and parse
Xapian::Query parsedQuery = parser.parse_query(freeQuery,
Xapian::QueryParser::FLAG_BOOLEAN|Xapian::QueryParser::FLAG_PHRASE|
Xapian::QueryParser::FLAG_LOVEHATE|Xapian::QueryParser::FLAG_BOOLEAN_ANY_CASE|
#if XAPIAN_MAJOR_VERSION==0
Xapian::QueryParser::FLAG_WILDCARD
#else
Xapian::QueryParser::FLAG_WILDCARD|Xapian::QueryParser::FLAG_PURE_NOT
#endif
);
// Apply a date range ?
bool enableMin = queryProps.getMinimumDate(minDay, minMonth, minYear);
bool enableMax = queryProps.getMaximumDate(maxDay, maxMonth, maxYear);
if ((enableMin == false) &&
(enableMax == false))
{
// No
return parsedQuery;
}
// Anyone going as far back as Year 0 is taking the piss :-)
if ((enableMin == false) ||
(minYear == 0))
{
minDay = minMonth = 1;
minYear = 1970;
}
// If the second date is older than the Epoch, the first date should be set too
if ((enableMax == false) ||
(maxYear == 0))
{
time_t nowTime = time(NULL);
struct tm *timeTm = localtime(&nowTime);
maxYear = timeTm->tm_year + 1900;
maxMonth = timeTm->tm_mon + 1;
maxDay = timeTm->tm_mday;
}
string yyyymmddMin(TimeConverter::toYYYYMMDDString(minYear, minMonth, minDay));
string yyyymmddMax(TimeConverter::toYYYYMMDDString(maxYear, maxMonth, maxDay));
time_t startTime = TimeConverter::fromYYYYMMDDString(yyyymmddMin);
time_t endTime = TimeConverter::fromYYYYMMDDString(yyyymmddMax);
double diffTime = difftime(endTime, startTime);
if (diffTime > 0)
{
#ifdef DEBUG
cout << "XapianEngine::parseQuery: applied date range ("
<< yyyymmddMax << " <= " << yyyymmddMin << ")" << endl;
#endif
return Xapian::Query(Xapian::Query::OP_FILTER, parsedQuery,
dateFilter(minDay, minMonth, minYear, maxDay, maxMonth, maxYear));
}
#ifdef DEBUG
else cout << "XapianEngine::parseQuery: date range is zero or bogus ("
<< yyyymmddMax << " <= " << yyyymmddMin << ")" << endl;
#endif
return parsedQuery;
}
Xapian::Query XapianEngine::parseQuery(Xapian::Database *pIndex, const QueryProperties &queryProps,
const string &stemLanguage, bool followOperators)
{
string freeQuery(StringManip::replaceSubString(queryProps.getFreeQuery(), "\n", " "));
Xapian::QueryParser parser;
Xapian::Stem stemmer;
// Set things up
if (stemLanguage.empty() == false)
{
stemmer = Xapian::Stem(StringManip::toLowerCase(stemLanguage));
parser.set_stemming_strategy(Xapian::QueryParser::STEM_NONE);
}
else
{
parser.set_stemming_strategy(Xapian::QueryParser::STEM_ALL);
}
parser.set_stemmer(stemmer);
if (followOperators == true)
{
parser.set_default_op(Xapian::Query::OP_AND);
}
else
{
parser.set_default_op(Xapian::Query::OP_OR);
}
if (pIndex != NULL)
{
// The database is required for wildcards
parser.set_database(*pIndex);
}
// ...including prefixes
// X prefixes should always include a colon
parser.add_boolean_prefix("site", "H");
parser.add_boolean_prefix("file", "P");
parser.add_boolean_prefix("title", "S");
parser.add_boolean_prefix("url", "U");
parser.add_boolean_prefix("dir", "XDIR:");
parser.add_boolean_prefix("lang", "L");
parser.add_boolean_prefix("type", "T");
parser.add_boolean_prefix("label", "XLABEL:");
// Activate all options and parse
return parser.parse_query(freeQuery,
Xapian::QueryParser::FLAG_BOOLEAN|Xapian::QueryParser::FLAG_PHRASE|Xapian::QueryParser::FLAG_LOVEHATE|Xapian::QueryParser::FLAG_BOOLEAN_ANY_CASE|Xapian::QueryParser::FLAG_WILDCARD);
}
ResultIterator CollectionQuery::exec()
{
Xapian::Database db;
try {
db = Xapian::Database(QFile::encodeName(d->databaseDir).constData());
} catch (const Xapian::DatabaseError &e) {
qWarning() << "Failed to open Xapian database:" << d->databaseDir
<< "; error:" << QString::fromStdString(e.get_error_string());
return ResultIterator();
}
QList<Xapian::Query> queries;
if (!d->nameString.isEmpty()) {
qDebug() << "searching by name";
Xapian::QueryParser parser;
parser.set_database(db);
parser.add_prefix("", "N");
parser.set_default_op(Xapian::Query::OP_AND);
queries << parser.parse_query(d->nameString.toUtf8().constData(),
Xapian::QueryParser::FLAG_PARTIAL);
}
if (!d->identifierString.isEmpty()) {
Xapian::QueryParser parser;
parser.set_database(db);
parser.add_prefix("", "I");
parser.set_default_op(Xapian::Query::OP_AND);
queries << parser.parse_query(d->identifierString.toUtf8().constData(),
Xapian::QueryParser::FLAG_PARTIAL);
}
if (!d->pathString.isEmpty()) {
Xapian::QueryParser parser;
parser.set_database(db);
parser.add_prefix("", "P");
parser.set_default_op(Xapian::Query::OP_AND);
queries << parser.parse_query(d->pathString.toUtf8().constData(),
Xapian::QueryParser::FLAG_PARTIAL | Xapian::QueryParser::FLAG_PHRASE);
}
if (!d->ns.isEmpty()) {
QList<Xapian::Query> queryList;
Q_FOREACH (const QString &n, d->ns) {
const QByteArray term = "NS" + n.toUtf8();
queryList << Xapian::Query(term.constData());
}
queries << Xapian::Query(Xapian::Query::OP_OR, queryList.begin(), queryList.end());
}
Xapian::Query PIMSearchStore::constructQuery(const QString &property, const QVariant &value,
Term::Comparator com)
{
if (value.isNull()) {
return Xapian::Query();
}
QString prop = property.toLower();
if (m_boolProperties.contains(prop)) {
QString p = m_prefix.value(prop);
if (p.isEmpty()) {
return Xapian::Query();
}
std::string term("B");
bool isTrue = false;
if (value.isNull()) {
isTrue = true;
}
if (value.type() == QVariant::Bool) {
isTrue = value.toBool();
}
if (isTrue) {
term += p.toStdString();
} else {
term += 'N' + p.toStdString();
}
return Xapian::Query(term);
}
if (m_boolWithValue.contains(prop)) {
std::string term(m_prefix.value(prop).toStdString());
std::string val(value.toString().toUtf8().constData());
return Xapian::Query(term + val);
}
if (m_valueProperties.contains(prop) && (com == Term::Equal || com == Term::Greater || com == Term::GreaterEqual || com == Term::Less || com == Term::LessEqual)) {
qlonglong numVal = value.toLongLong();
qDebug() << value << numVal;
if (com == Term::Greater) {
++numVal;
}
if (com == Term::Less) {
--numVal;
}
int valueNumber = m_valueProperties.value(prop);
if (com == Term::GreaterEqual || com == Term::Greater) {
return Xapian::Query(Xapian::Query::OP_VALUE_GE, valueNumber, QString::number(numVal).toStdString());
} else if (com == Term::LessEqual || com == Term::Less) {
return Xapian::Query(Xapian::Query::OP_VALUE_LE, valueNumber, QString::number(numVal).toStdString());
} else if (com == Term::Equal) {
const Xapian::Query gtQuery(Xapian::Query::OP_VALUE_GE, valueNumber, QString::number(numVal).toStdString());
const Xapian::Query ltQuery(Xapian::Query::OP_VALUE_LE, valueNumber, QString::number(numVal).toStdString());
return Xapian::Query(Xapian::Query::OP_AND, gtQuery, ltQuery);
}
} else if ((com == Term::Contains || com == Term::Equal) && m_prefix.contains(prop)) {
Xapian::QueryParser parser;
parser.set_database(*xapianDb());
std::string p = m_prefix.value(prop).toStdString();
std::string str(value.toString().toUtf8().constData());
int flags = Xapian::QueryParser::FLAG_DEFAULT;
if (com == Term::Contains) {
flags |= Xapian::QueryParser::FLAG_PARTIAL;
}
return parser.parse_query(str, flags, p);
}
return Xapian::Query(value.toString().toStdString());
}
int main(int argc, char **argv)
{
if(argc < 2) {
usage(argv);
return 1;
}
try {
char *action = argv[1];
char *db_path = argv[2];
if(!strcmp(action, "index")) {
Xapian::WritableDatabase db(db_path, Xapian::DB_CREATE_OR_OPEN);
Xapian::TermGenerator indexer;
Xapian::Stem stemmer("english");
indexer.set_stemmer(stemmer);
std::string doc_txt;
while(true) {
if(std::cin.eof()) break;
std::string line;
getline(std::cin, line);
doc_txt += line;
}
if(!doc_txt.empty()) {
Xapian::Document doc;
doc.set_data(doc_txt);
indexer.set_document(doc);
indexer.index_text(doc_txt);
db.add_document(doc);
std::cout << "Indexed: " << indexer.get_description() << std::endl;
}
db.commit();
} else if(!strcmp(action, "search")) {
if(argc < 4) {
std::cerr << "You must supply a query string" << std::endl;
return 1;
}
Xapian::Database db(db_path);
Xapian::Enquire enquire(db);
std::string query_str = argv[3];
argv+= 4;
while(*argv) {
query_str += ' ';
query_str += *argv++;
}
Xapian::QueryParser qp;
Xapian::Stem stemmer("english");
qp.set_stemmer(stemmer);
qp.set_database(db);
qp.set_stemming_strategy(Xapian::QueryParser::STEM_SOME);
Xapian::Query query = qp.parse_query(query_str);
std::cout << "Parsed query is: " << query.get_description() <<
std::endl;
enquire.set_query(query);
Xapian::MSet matches = enquire.get_mset(0, 10);
std::cout << matches.get_matches_estimated() << " results found.\n";
std::cout << "Matches 1-" << matches.size() << ":\n" << std::endl;
for (Xapian::MSetIterator i = matches.begin();
i != matches.end(); ++i) {
std::cout << i.get_rank() + 1 << ": " << i.get_percent() <<
"% docid=" << *i << " [" <<
i.get_document().get_data()<< "]" << std::endl <<
std::endl;
}
} else {
std::cerr << "Invalid action " << action << std::endl;
usage(argv);
return 1;
}
} catch (const Xapian::Error &error) {
std::cout << "Exception: " << error.get_msg() << std::endl;
}
}
Xapian::Query XapianEngine::parseQuery(Xapian::Database *pIndex, const QueryProperties &queryProps,
const string &stemLanguage, DefaultOperator defaultOperator,
const string &limitQuery, string &correctedFreeQuery, bool minimal)
{
Xapian::QueryParser parser;
Xapian::Stem stemmer;
CJKVTokenizer tokenizer;
string freeQuery(StringManip::replaceSubString(queryProps.getFreeQuery(), "\n", " "));
unsigned int minDay, minMonth, minYear = 0;
unsigned int maxDay, maxMonth, maxYear = 0;
if (tokenizer.has_cjkv_only(freeQuery) == true)
{
vector<string> tokens;
string cjkvQuery;
tokenizer.tokenize(freeQuery, tokens);
// Get the terms
for (vector<string>::const_iterator tokenIter = tokens.begin();
tokenIter != tokens.end(); ++tokenIter)
{
cjkvQuery += *tokenIter;
cjkvQuery += " ";
}
#ifdef DEBUG
cout << "XapianEngine::parseQuery: CJKV query is " << cjkvQuery << endl;
#endif
// Do as if the user had given this as input
freeQuery = cjkvQuery;
// We can disable stemming and spelling correction
minimal = true;
}
if (pIndex != NULL)
{
// The database is required for wildcards and spelling
parser.set_database(*pIndex);
}
// Set things up
if ((minimal == false) &&
(stemLanguage.empty() == false))
{
#ifdef DEBUG
cout << "XapianEngine::parseQuery: " << stemLanguage << " stemming" << endl;
#endif
try
{
stemmer = Xapian::Stem(StringManip::toLowerCase(stemLanguage));
}
catch (const Xapian::Error &error)
{
cerr << "Couldn't create stemmer: " << error.get_type() << ": " << error.get_msg() << endl;
}
parser.set_stemmer(stemmer);
parser.set_stemming_strategy(Xapian::QueryParser::STEM_SOME);
}
else
{
#ifdef DEBUG
cout << "XapianEngine::parseQuery: no stemming" << endl;
#endif
parser.set_stemming_strategy(Xapian::QueryParser::STEM_NONE);
}
// What's the default operator ?
if (defaultOperator == DEFAULT_OP_AND)
{
parser.set_default_op(Xapian::Query::OP_AND);
}
else
{
parser.set_default_op(Xapian::Query::OP_OR);
}
// X prefixes should always include a colon
parser.add_boolean_prefix("site", "H");
parser.add_boolean_prefix("file", "P");
parser.add_boolean_prefix("ext", "XEXT:");
parser.add_prefix("title", "S");
parser.add_boolean_prefix("url", "U");
parser.add_boolean_prefix("dir", "XDIR:");
parser.add_boolean_prefix("lang", "L");
parser.add_boolean_prefix("type", "T");
parser.add_boolean_prefix("class", "XCLASS:");
parser.add_boolean_prefix("label", "XLABEL:");
parser.add_boolean_prefix("tokens", "XTOK:");
// Any limit on what documents should be searched ?
if (limitQuery.empty() == false)
{
string limitedQuery(limitQuery);
limitedQuery += " AND ( ";
limitedQuery += freeQuery;
limitedQuery += " )";
freeQuery = limitedQuery;
#ifdef DEBUG
cout << "XapianEngine::parseQuery: " << freeQuery << endl;
#endif
}
// Date range
Xapian::DateValueRangeProcessor dateProcessor(0);
parser.add_valuerangeprocessor(&dateProcessor);
// Size with a "b" suffix, ie 1024..10240b
#if XAPIAN_NUM_VERSION >= 1001000
Xapian::NumberValueRangeProcessor sizeProcessor(2, "b", false);
parser.add_valuerangeprocessor(&sizeProcessor);
#elif XAPIAN_NUM_VERSION >= 1000002
// Xapian 1.02 is the bare minimum
Xapian::v102::NumberValueRangeProcessor sizeProcessor(2, "b", false);
parser.add_valuerangeprocessor(&sizeProcessor);
#endif
// Time range
TimeValueRangeProcessor timeProcessor(3);
parser.add_valuerangeprocessor(&timeProcessor);
// What type of query is this ?
QueryProperties::QueryType type = queryProps.getType();
if (type != QueryProperties::XAPIAN_QP)
{
map<string, string> fieldMapping;
// Bare minimum mapping between Xesam fields and our prefixes
fieldMapping["dc:title"] = "S";
XapianQueryBuilder builder(parser, fieldMapping);
XesamParser *pParser = NULL;
// Get a Xesam parser
if (type == QueryProperties::XESAM_QL)
{
pParser = new XesamQLParser();
}
#ifdef HAVE_BOOST_SPIRIT_CORE_HPP
else if (type == QueryProperties::XESAM_UL)
{
pParser = new XesamULParser();
}
#endif
if (pParser != NULL)
{
bool parsedQuery = pParser->parse(freeQuery, builder);
delete pParser;
if (parsedQuery == true)
{
return builder.get_query();
}
}
return Xapian::Query();
}
// Do some pre-processing : look for filters with quoted values
string::size_type escapedFilterEnd = 0;
string::size_type escapedFilterStart = freeQuery.find(":\"");
while ((escapedFilterStart != string::npos) &&
(escapedFilterStart < freeQuery.length() - 2))
{
escapedFilterEnd = freeQuery.find("\"", escapedFilterStart + 2);
if (escapedFilterEnd == string::npos)
{
break;
}
string filterValue = freeQuery.substr(escapedFilterStart + 2, escapedFilterEnd - escapedFilterStart - 2);
if (filterValue.empty() == false)
{
string escapedValue(Url::escapeUrl(filterValue));
bool escapeValue = false, hashValue = false;
// The value should be escaped and length-limited as done at indexing time
checkFilter(freeQuery, escapedFilterStart, escapeValue, hashValue);
if (escapeValue == false)
{
// No escaping
escapedValue = filterValue;
}
if (hashValue == true)
{
// Partially hash if necessary
escapedValue = XapianDatabase::limitTermLength(escapedValue, true);
}
else
{
escapedValue = XapianDatabase::limitTermLength(escapedValue);
}
freeQuery.replace(escapedFilterStart + 1, escapedFilterEnd - escapedFilterStart,
escapedValue);
escapedFilterEnd = escapedFilterEnd + escapedValue.length() - filterValue.length();
}
else
{
// No value !
freeQuery.replace(escapedFilterStart, escapedFilterEnd - escapedFilterStart + 1, ":");
escapedFilterEnd -= 2;
}
#ifdef DEBUG
cout << "XapianEngine::parseQuery: replaced filter: " << freeQuery << endl;
#endif
// Next
escapedFilterStart = freeQuery.find(":\"", escapedFilterEnd);
}
// Parse the query string with all necessary options
unsigned int flags = Xapian::QueryParser::FLAG_BOOLEAN|Xapian::QueryParser::FLAG_PHRASE|
Xapian::QueryParser::FLAG_LOVEHATE|Xapian::QueryParser::FLAG_BOOLEAN_ANY_CASE|
Xapian::QueryParser::FLAG_PURE_NOT;
if (minimal == false)
{
flags |= Xapian::QueryParser::FLAG_WILDCARD;
#if ENABLE_XAPIAN_SPELLING_CORRECTION>0
flags |= Xapian::QueryParser::FLAG_SPELLING_CORRECTION;
#endif
}
Xapian::Query parsedQuery = parser.parse_query(freeQuery, flags);
#ifdef DEBUG
cout << "XapianEngine::parseQuery: " << parsedQuery.get_description() << endl;
#endif
if (minimal == false)
{
#if ENABLE_XAPIAN_SPELLING_CORRECTION>0
// Any correction ?
correctedFreeQuery = parser.get_corrected_query_string();
#ifdef DEBUG
if (correctedFreeQuery.empty() == false)
{
cout << "XapianEngine::parseQuery: corrected spelling to: " << correctedFreeQuery << endl;
}
#endif
#endif
}
return parsedQuery;
}
