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/** @file api_stem.cc
* @brief Test the stemming API
*/
/* Copyright (C) 2010,2012 Olly Betts
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "api_stem.h"
#include <xapian.h>
#include "apitest.h"
#include "testsuite.h"
#include "testutils.h"
using namespace std;
class MyStemImpl : public Xapian::StemImplementation {
string operator()(const string & word) {
if (word == "vanish")
return string();
return word.substr(0, 3);
}
string get_description() const {
return "MyStem()";
}
};
/// Test user stemming algorithms.
DEFINE_TESTCASE(stem1, !backend) {
Xapian::Stem st(new MyStemImpl);
TEST_EQUAL(st.get_description(), "Xapian::Stem(MyStem())");
TEST_EQUAL(st("a"), "a");
TEST_EQUAL(st("foo"), "foo");
TEST_EQUAL(st("food"), "foo");
return true;
}
/// New feature in 1.0.21/1.2.1 - "nb" and "nn" select the Norwegian stemmer.
DEFINE_TESTCASE(stem2, !backend) {
Xapian::Stem st_norwegian("norwegian");
TEST_EQUAL(st_norwegian.get_description(),
Xapian::Stem("nb").get_description());
TEST_EQUAL(st_norwegian.get_description(),
Xapian::Stem("nn").get_description());
TEST_EQUAL(st_norwegian.get_description(),
Xapian::Stem("no").get_description());
TEST_NOT_EQUAL(st_norwegian.get_description(),
Xapian::Stem("en").get_description());
TEST_NOT_EQUAL(st_norwegian.get_description(),
Xapian::Stem("none").get_description());
return true;
}
/// Test add a stemmer test
DEFINE_TESTCASE(stem3, !backend) {
Xapian::Stem earlyenglish("earlyenglish");
TEST_EQUAL(earlyenglish("loved"), "love");
TEST_EQUAL(earlyenglish("loving"), "love");
TEST_EQUAL(earlyenglish("loveth"), "love");
TEST_EQUAL(earlyenglish("givest"), "give");
return true;
}
/// Test handling of a stemmer returning an empty string.
// Regression test for https://trac.xapian.org/ticket/741 fixed in 1.4.2.
DEFINE_TESTCASE(stemempty1, !backend) {
Xapian::Stem st(new MyStemImpl);
Xapian::TermGenerator tg;
Xapian::Document doc;
tg.set_document(doc);
tg.set_stemmer(st);
tg.set_stemming_strategy(tg.STEM_ALL);
tg.index_text("watch me vanish now");
auto i = doc.termlist_begin();
TEST(i != doc.termlist_end());
TEST_EQUAL(*i, "me");
TEST(++i != doc.termlist_end());
TEST_EQUAL(*i, "now");
TEST(++i != doc.termlist_end());
TEST_EQUAL(*i, "wat");
TEST(++i == doc.termlist_end());
return true;
}
/// Test invalid language names with various characters in.
DEFINE_TESTCASE(stemlangs2, !backend) {
string lang("xdummy");
for (unsigned ch = 0; ch <= 255; ++ch) {
lang[0] = ch;
TEST_EXCEPTION(Xapian::InvalidArgumentError, Xapian::Stem stem(lang));
}
return true;
}
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