1// Copyright 2016 PDFium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "core/fxcrt/string_pool_template.h"
6#include "core/fxcrt/fx_string.h"
7#include "testing/gtest/include/gtest/gtest.h"
8
9namespace fxcrt {
10
11TEST(StringPool, ByteString) {
12  ByteStringPool pool;
13
14  ByteString null1;
15  ByteString null2;
16  ByteString goats1("goats");
17  ByteString goats2("goats");
18
19  // Underlying storage, if non-null, is not shared.
20  EXPECT_EQ(nullptr, null1.m_pData.Get());
21  EXPECT_EQ(nullptr, null2.m_pData.Get());
22  EXPECT_NE(goats1.m_pData, goats2.m_pData);
23
24  ByteString interned_null1 = pool.Intern(null1);
25  ByteString interned_null2 = pool.Intern(null2);
26  ByteString interned_goats1 = pool.Intern(goats1);
27  ByteString interned_goats2 = pool.Intern(goats2);
28
29  // Strings are logically equal after being interned.
30  EXPECT_EQ(null1, interned_null1);
31  EXPECT_EQ(null2, interned_null2);
32  EXPECT_EQ(goats1, interned_goats1);
33  EXPECT_EQ(goats2, interned_goats2);
34
35  // Interned underlying storage, if non-null, belongs to first seen.
36  EXPECT_EQ(nullptr, interned_null1.m_pData.Get());
37  EXPECT_EQ(nullptr, interned_null2.m_pData.Get());
38  EXPECT_EQ(goats1.m_pData, interned_goats1.m_pData);
39  EXPECT_EQ(goats1.m_pData, interned_goats2.m_pData);
40
41  pool.Clear();
42  ByteString reinterned_null2 = pool.Intern(null2);
43  ByteString reinterned_null1 = pool.Intern(null2);
44  ByteString reinterned_goats2 = pool.Intern(goats2);
45  ByteString reinterned_goats1 = pool.Intern(goats2);
46
47  // After clearing pool, storage was re-interned using second strings.
48  EXPECT_EQ(nullptr, interned_null1.m_pData.Get());
49  EXPECT_EQ(nullptr, interned_null2.m_pData.Get());
50  EXPECT_EQ(goats2.m_pData, reinterned_goats1.m_pData);
51  EXPECT_EQ(goats2.m_pData, reinterned_goats2.m_pData);
52}
53
54TEST(StringPool, WideString) {
55  WideStringPool pool;
56
57  WideString null1;
58  WideString null2;
59  WideString goats1(L"goats");
60  WideString goats2(L"goats");
61
62  // Underlying storage, if non-null, is not shared.
63  EXPECT_EQ(nullptr, null1.m_pData.Get());
64  EXPECT_EQ(nullptr, null2.m_pData.Get());
65  EXPECT_NE(goats1.m_pData, goats2.m_pData);
66
67  WideString interned_null1 = pool.Intern(null1);
68  WideString interned_null2 = pool.Intern(null2);
69  WideString interned_goats1 = pool.Intern(goats1);
70  WideString interned_goats2 = pool.Intern(goats2);
71
72  // Strings are logically equal after being interned.
73  EXPECT_EQ(null1, interned_null1);
74  EXPECT_EQ(null2, interned_null2);
75  EXPECT_EQ(goats1, interned_goats1);
76  EXPECT_EQ(goats2, interned_goats2);
77
78  // Interned underlying storage, if non-null, belongs to first seen.
79  EXPECT_EQ(nullptr, interned_null1.m_pData.Get());
80  EXPECT_EQ(nullptr, interned_null2.m_pData.Get());
81  EXPECT_EQ(goats1.m_pData, interned_goats1.m_pData);
82  EXPECT_EQ(goats1.m_pData, interned_goats2.m_pData);
83
84  pool.Clear();
85  WideString reinterned_null2 = pool.Intern(null2);
86  WideString reinterned_null1 = pool.Intern(null2);
87  WideString reinterned_goats2 = pool.Intern(goats2);
88  WideString reinterned_goats1 = pool.Intern(goats2);
89
90  // After clearing pool, storage was re-interned using second strings.
91  EXPECT_EQ(nullptr, interned_null1.m_pData.Get());
92  EXPECT_EQ(nullptr, interned_null2.m_pData.Get());
93  EXPECT_EQ(goats2.m_pData, reinterned_goats1.m_pData);
94  EXPECT_EQ(goats2.m_pData, reinterned_goats2.m_pData);
95}
96
97}  // namespace fxcrt
98