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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/searchlib/util/foldedstringcompare.h>
#include <vespa/vespalib/gtest/gtest.h>
#include <vespa/vespalib/stllike/string.h>
#include <vespa/vespalib/text/lowercase.h>
#include <vespa/vespalib/text/utf8.h>
using search::FoldedStringCompare;
using vespalib::LowerCase;
using vespalib::Utf8ReaderForZTS;
using IntVec = std::vector<int>;
using StringVec = std::vector<vespalib::string>;
namespace {
template <bool fold>
std::vector<uint32_t> as_utf32(const char* key)
{
std::vector<uint32_t> result;
Utf8ReaderForZTS reader(key);
while (reader.hasMore()) {
uint32_t code_point = fold ? LowerCase::convert(reader.getChar()) : reader.getChar();
result.push_back(code_point);
}
return result;
}
}
class FoldedStringCompareTest : public ::testing::Test
{
protected:
FoldedStringCompareTest();
~FoldedStringCompareTest() override;
static int normalize_ret(int ret) {
return (ret == 0) ? 0 : ((ret < 0) ? -1 : 1);
}
template <bool fold_lhs, bool fold_rhs>
int
compare_folded_helper2(const vespalib::string& lhs, const vespalib::string& rhs)
{
int ret = FoldedStringCompare::compareFolded<fold_lhs, fold_rhs>(lhs.c_str(), rhs.c_str());
auto folded_lhs_utf32 = as_utf32<fold_lhs>(lhs.c_str());
EXPECT_EQ(ret, (FoldedStringCompare::compareFolded<false, fold_rhs>(std::cref(folded_lhs_utf32), rhs.c_str())));
auto folded_rhs_utf32 = as_utf32<fold_rhs>(rhs.c_str());
EXPECT_EQ(ret, (FoldedStringCompare::compareFolded<fold_lhs, false>(lhs.c_str(), std::cref(folded_rhs_utf32))));
return ret;
}
template <bool fold_lhs, bool fold_rhs>
int
compare_folded_helper(const vespalib::string& lhs, const vespalib::string& rhs)
{
int ret = compare_folded_helper2<fold_lhs, fold_rhs>(lhs, rhs);
EXPECT_EQ(-ret, (compare_folded_helper2<fold_rhs, fold_lhs>(rhs, lhs)));
return ret;
}
IntVec
compare_folded(const vespalib::string& lhs, const vespalib::string& rhs)
{
IntVec result;
result.emplace_back(compare_folded_helper<false, false>(lhs, rhs));
result.emplace_back(compare_folded_helper<false, true>(lhs, rhs));
result.emplace_back(compare_folded_helper<true, false>(lhs, rhs));
result.emplace_back(compare_folded_helper<true, true>(lhs, rhs));
return result;
}
template <bool fold_lhs, bool fold_rhs>
int
compare_folded_prefix_helper(const vespalib::string& lhs, const vespalib::string& rhs, size_t prefix_len)
{
int ret = FoldedStringCompare::compareFoldedPrefix<fold_lhs, fold_rhs>(lhs.c_str(), rhs.c_str(), prefix_len);
EXPECT_EQ(-ret, (FoldedStringCompare::compareFoldedPrefix<fold_rhs, fold_lhs>(rhs.c_str(), lhs.c_str(), prefix_len)));
return ret;
}
IntVec
compare_folded_prefix(const vespalib::string& lhs, const vespalib::string& rhs, size_t prefix_len)
{
IntVec result;
result.emplace_back(compare_folded_prefix_helper<false, false>(lhs, rhs, prefix_len));
result.emplace_back(compare_folded_prefix_helper<false, true>(lhs, rhs, prefix_len));
result.emplace_back(compare_folded_prefix_helper<true, false>(lhs, rhs, prefix_len));
result.emplace_back(compare_folded_prefix_helper<true, true>(lhs, rhs, prefix_len));
return result;
}
int
compare(const vespalib::string& lhs, const vespalib::string& rhs) {
int ret = normalize_ret(FoldedStringCompare::compare(lhs.c_str(), rhs.c_str()));
EXPECT_EQ(-ret, normalize_ret(FoldedStringCompare::compare(rhs.c_str(), lhs.c_str())));
return ret;
}
int
compare_prefix(const vespalib::string& lhs, const vespalib::string& rhs, size_t prefix_len) {
int ret = normalize_ret(FoldedStringCompare::comparePrefix(lhs.c_str(), rhs.c_str(), prefix_len));
EXPECT_EQ(-ret, normalize_ret(FoldedStringCompare::comparePrefix(rhs.c_str(), lhs.c_str(), prefix_len)));
return ret;
}
};
FoldedStringCompareTest::FoldedStringCompareTest()
: ::testing::Test()
{
}
FoldedStringCompareTest::~FoldedStringCompareTest() = default;
TEST_F(FoldedStringCompareTest, compare_folded)
{
EXPECT_EQ((IntVec{0, 0, 0, 0}), compare_folded("bar", "bar"));
EXPECT_EQ((IntVec{1, 0, 1, 0}), compare_folded("bar", "BAR"));
EXPECT_EQ((IntVec{-1, -1, 0, 0}), compare_folded("BAR", "bar"));
EXPECT_EQ((IntVec{0, -1, 1, 0}), compare_folded("BAR", "BAR"));
EXPECT_EQ((IntVec{1, -1, 1, -1}), compare_folded("bar", "FOO"));
EXPECT_EQ((IntVec{-1, -1, -1, -1}), compare_folded("BAR", "foo"));
}
TEST_F(FoldedStringCompareTest, compare_folded_prefix)
{
EXPECT_EQ((IntVec{0, 0, 0, 0}), compare_folded_prefix("bar", "bar", 100));
EXPECT_EQ((IntVec{1, 0, 1, 0}), compare_folded_prefix("bar", "BAR", 100));
EXPECT_EQ((IntVec{-1, -1, 0, 0}), compare_folded_prefix("BAR", "bar", 100));
EXPECT_EQ((IntVec{0, -1, 1, 0}), compare_folded_prefix("BAR", "BAR", 100));
EXPECT_EQ((IntVec{1, -1, 1, -1}), compare_folded_prefix("bar", "FOO", 100));
EXPECT_EQ((IntVec{-1, -1, -1, -1}), compare_folded_prefix("BAR", "foo", 100));
EXPECT_EQ((IntVec{1, 0, 1, 0}), compare_folded_prefix("ba", "BAR", 2));
EXPECT_EQ((IntVec{-1, -1, 0, 0}), compare_folded_prefix("BA", "bar", 2));
EXPECT_EQ((IntVec{1, -1, 1, -1}), compare_folded_prefix("ba", "FOO", 2));
EXPECT_EQ((IntVec{-1, -1, -1, -1}), compare_folded_prefix("BA", "foo", 2));
}
TEST_F(FoldedStringCompareTest, compare)
{
EXPECT_EQ(0, compare("bar", "bar"));
EXPECT_EQ(1, compare("bar", "BAR"));
EXPECT_EQ(0, compare("BAR", "BAR"));
EXPECT_EQ(1, compare("FOO", "bar"));
EXPECT_EQ(-1, compare("BAR", "foo"));
StringVec words{"foo", "FOO", "bar", "BAR"};
std::sort(words.begin(), words.end(), [this](auto& lhs, auto& rhs) { return compare(lhs, rhs) < 0; });
EXPECT_EQ((StringVec{"BAR", "bar", "FOO", "foo"}), words);
}
namespace {
const char* char_from_u8(const char8_t* p) {
return reinterpret_cast<const char*>(p);
}
}
TEST_F(FoldedStringCompareTest, compare_prefix)
{
EXPECT_EQ(1, compare_prefix("ba", "BAR", 2));
EXPECT_EQ(-1, compare_prefix("BA", "bar", 2));
EXPECT_EQ(-1, compare_prefix("ba", "FOO", 2));
EXPECT_EQ(-1, compare_prefix("BA", "foo", 2));
// Verify that we don't mix number of bytes versus number of code points
EXPECT_EQ(1, compare_prefix(char_from_u8(u8"å"), char_from_u8(u8"Å"), 1));
}
GTEST_MAIN_RUN_ALL_TESTS()
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