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https://github.com/tesseract-ocr/tesseract.git
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115 lines
3.6 KiB
C++
115 lines
3.6 KiB
C++
// (C) Copyright 2017, Google Inc.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <cmath>
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#include <cstdio>
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#include <string>
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#include "indexmapbidi.h"
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#include "include_gunit.h"
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using tesseract::IndexMap;
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using tesseract::IndexMapBiDi;
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const int kPrimeLimit = 1000;
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namespace {
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class IndexMapBiDiTest : public testing::Test {
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public:
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std::string OutputNameToPath(const std::string& name) {
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return file::JoinPath(FLAGS_test_tmpdir, name);
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}
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// Computes primes up to kPrimeLimit, using the sieve of Eratosthenes.
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void ComputePrimes(IndexMapBiDi* map) {
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map->Init(kPrimeLimit + 1, false);
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map->SetMap(2, true);
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// Set all the odds to true.
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for (int i = 3; i <= kPrimeLimit; i += 2) map->SetMap(i, true);
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int factor_limit = static_cast<int>(sqrt(1.0 + kPrimeLimit));
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for (int f = 3; f <= factor_limit; f += 2) {
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if (map->SparseToCompact(f) >= 0) {
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for (int m = 2; m * f <= kPrimeLimit; ++m) map->SetMap(f * m, false);
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}
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}
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map->Setup();
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}
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void TestPrimes(const IndexMap& map) {
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// Now all primes are mapped in the sparse map to their index.
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// According to Wikipedia, the 168th prime is 997, and it has compact
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// index 167 because we are indexing from 0.
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EXPECT_EQ(167, map.SparseToCompact(997));
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EXPECT_EQ(997, map.CompactToSparse(167));
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// 995, 996, 998, 999 are not prime.
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EXPECT_EQ(-1, map.SparseToCompact(995));
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EXPECT_EQ(-1, map.SparseToCompact(996));
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EXPECT_EQ(-1, map.SparseToCompact(998));
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EXPECT_EQ(-1, map.SparseToCompact(999));
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// The 167th prime is 991.
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EXPECT_EQ(991, map.CompactToSparse(166));
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// There are 168 primes in 0..1000.
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EXPECT_EQ(168, map.CompactSize());
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EXPECT_EQ(kPrimeLimit + 1, map.SparseSize());
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}
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};
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// Tests the sieve of Eratosthenes as a way of testing setup.
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TEST_F(IndexMapBiDiTest, Primes) {
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IndexMapBiDi map;
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ComputePrimes(&map);
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TestPrimes(map);
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// It still works if we assign it to another.
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IndexMapBiDi map2;
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map2.CopyFrom(map);
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TestPrimes(map2);
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// Or if we assign it to a base class.
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IndexMap base_map;
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base_map.CopyFrom(map);
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TestPrimes(base_map);
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// Test file i/o too.
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std::string filename = OutputNameToPath("primesmap");
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FILE* fp = fopen(filename.c_str(), "wb");
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CHECK(fp != nullptr);
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EXPECT_TRUE(map.Serialize(fp));
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fclose(fp);
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fp = fopen(filename.c_str(), "rb");
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CHECK(fp != nullptr);
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IndexMapBiDi read_map;
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EXPECT_TRUE(read_map.DeSerialize(false, fp));
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fclose(fp);
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TestPrimes(read_map);
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}
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// Tests the many-to-one setup feature.
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TEST_F(IndexMapBiDiTest, ManyToOne) {
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// Test the example in the comment on CompleteMerges.
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IndexMapBiDi map;
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map.Init(13, false);
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map.SetMap(2, true);
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map.SetMap(4, true);
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map.SetMap(7, true);
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map.SetMap(9, true);
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map.SetMap(11, true);
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map.Setup();
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map.Merge(map.SparseToCompact(2), map.SparseToCompact(9));
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map.Merge(map.SparseToCompact(4), map.SparseToCompact(11));
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map.CompleteMerges();
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EXPECT_EQ(3, map.CompactSize());
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EXPECT_EQ(13, map.SparseSize());
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EXPECT_EQ(1, map.SparseToCompact(4));
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EXPECT_EQ(4, map.CompactToSparse(1));
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EXPECT_EQ(1, map.SparseToCompact(11));
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}
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} // namespace.
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