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// Copyright 2020 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <cstdlib>
#include <ctime>
#include <memory>
#include <random>
#include <sstream>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/debugging/leak_check.h"
#include "absl/strings/internal/cord_internal.h"
#include "absl/strings/internal/cord_rep_ring.h"
#include "absl/strings/internal/cord_rep_ring_reader.h"
#include "absl/strings/string_view.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {
namespace {
using testing::Eq;
// Creates a flat for testing
CordRep* MakeFlat(absl::string_view s) {
CordRepFlat* flat = CordRepFlat::New(s.length());
memcpy(flat->Data(), s.data(), s.length());
flat->length = s.length();
return flat;
}
CordRepRing* FromFlats(Span<absl::string_view const> flats) {
CordRepRing* ring = CordRepRing::Create(MakeFlat(flats[0]), flats.size() - 1);
for (int i = 1; i < flats.size(); ++i) {
ring = CordRepRing::Append(ring, MakeFlat(flats[i]));
}
return ring;
}
std::array<absl::string_view, 12> TestFlats() {
return {"abcdefghij", "klmnopqrst", "uvwxyz", "ABCDEFGHIJ",
"KLMNOPQRST", "UVWXYZ", "1234567890", "~!@#$%^&*()_",
"+-=", "[]\\{}|;':", ",/<>?", "."};
}
TEST(CordRingReaderTest, DefaultInstance) {
CordRepRingReader reader;
EXPECT_FALSE(static_cast<bool>(reader));
EXPECT_THAT(reader.ring(), Eq(nullptr));
#ifndef NDEBUG
EXPECT_DEATH_IF_SUPPORTED(reader.length(), ".*");
EXPECT_DEATH_IF_SUPPORTED(reader.consumed(), ".*");
EXPECT_DEATH_IF_SUPPORTED(reader.remaining(), ".*");
EXPECT_DEATH_IF_SUPPORTED(reader.Next(), ".*");
EXPECT_DEATH_IF_SUPPORTED(reader.Seek(0), ".*");
#endif
}
TEST(CordRingReaderTest, Reset) {
CordRepRingReader reader;
auto flats = TestFlats();
CordRepRing* ring = FromFlats(flats);
absl::string_view first = reader.Reset(ring);
EXPECT_THAT(first, Eq(flats[0]));
EXPECT_TRUE(static_cast<bool>(reader));
EXPECT_THAT(reader.ring(), Eq(ring));
EXPECT_THAT(reader.index(), Eq(ring->head()));
EXPECT_THAT(reader.length(), Eq(ring->length));
EXPECT_THAT(reader.consumed(), Eq(flats[0].length()));
EXPECT_THAT(reader.remaining(), Eq(ring->length - reader.consumed()));
reader.Reset();
EXPECT_FALSE(static_cast<bool>(reader));
EXPECT_THAT(reader.ring(), Eq(nullptr));
CordRep::Unref(ring);
}
TEST(CordRingReaderTest, Next) {
CordRepRingReader reader;
auto flats = TestFlats();
CordRepRing* ring = FromFlats(flats);
CordRepRing::index_type head = ring->head();
reader.Reset(ring);
size_t consumed = reader.consumed();
size_t remaining = reader.remaining();
for (int i = 1; i < flats.size(); ++i) {
consumed += flats[i].length();
remaining -= flats[i].length();
absl::string_view next = reader.Next();
ASSERT_THAT(next, Eq(flats[i]));
ASSERT_THAT(reader.index(), Eq(ring->advance(head, i)));
ASSERT_THAT(reader.consumed(), Eq(consumed));
ASSERT_THAT(reader.remaining(), Eq(remaining));
}
#ifndef NDEBUG
EXPECT_DEATH_IF_SUPPORTED(reader.Next(), ".*");
#endif
CordRep::Unref(ring);
}
TEST(CordRingReaderTest, SeekForward) {
CordRepRingReader reader;
auto flats = TestFlats();
CordRepRing* ring = FromFlats(flats);
CordRepRing::index_type head = ring->head();
reader.Reset(ring);
size_t consumed = 0;
size_t remaining = ring->length;;
for (int i = 0; i < flats.size(); ++i) {
size_t offset = consumed;
consumed += flats[i].length();
remaining -= flats[i].length();
for (int off = 0; off < flats[i].length(); ++off) {
absl::string_view chunk = reader.Seek(offset + off);
ASSERT_THAT(chunk, Eq(flats[i].substr(off)));
ASSERT_THAT(reader.index(), Eq(ring->advance(head, i)));
ASSERT_THAT(reader.consumed(), Eq(consumed));
ASSERT_THAT(reader.remaining(), Eq(remaining));
}
}
CordRep::Unref(ring);
}
TEST(CordRingReaderTest, SeekBackward) {
CordRepRingReader reader;
auto flats = TestFlats();
CordRepRing* ring = FromFlats(flats);
CordRepRing::index_type head = ring->head();
reader.Reset(ring);
size_t consumed = ring->length;
size_t remaining = 0;
for (int i = flats.size() - 1; i >= 0; --i) {
size_t offset = consumed - flats[i].length();
for (int off = 0; off < flats[i].length(); ++off) {
absl::string_view chunk = reader.Seek(offset + off);
ASSERT_THAT(chunk, Eq(flats[i].substr(off)));
ASSERT_THAT(reader.index(), Eq(ring->advance(head, i)));
ASSERT_THAT(reader.consumed(), Eq(consumed));
ASSERT_THAT(reader.remaining(), Eq(remaining));
}
consumed -= flats[i].length();
remaining += flats[i].length();
}
#ifndef NDEBUG
EXPECT_DEATH_IF_SUPPORTED(reader.Seek(ring->length), ".*");
#endif
CordRep::Unref(ring);
}
} // namespace
} // namespace cord_internal
ABSL_NAMESPACE_END
} // namespace absl
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