1 // Copyright (c) 2012 The Chromium 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 "testing/gtest/include/gtest/gtest.h"
6 #include "ui/gfx/utf16_indexing.h"
7
8 namespace gfx {
9
TEST(UTF16IndexingTest,IndexOffsetConversions)10 TEST(UTF16IndexingTest, IndexOffsetConversions) {
11 // Valid surrogate pair surrounded by unpaired surrogates
12 const base::char16 foo[] =
13 {0xDC00, 0xD800, 0xD800, 0xDFFF, 0xDFFF, 0xDBFF, 0};
14 const base::string16 s(foo);
15 const size_t the_invalid_index = 3;
16 for (size_t i = 0; i <= s.length(); ++i)
17 EXPECT_EQ(i != the_invalid_index, IsValidCodePointIndex(s, i));
18 for (size_t i = 0; i <= s.length(); ++i) {
19 for (size_t j = i; j <= s.length(); ++j) {
20 ptrdiff_t offset = static_cast<ptrdiff_t>(j - i);
21 if (i <= the_invalid_index && j > the_invalid_index)
22 --offset;
23 EXPECT_EQ(offset, UTF16IndexToOffset(s, i, j));
24 EXPECT_EQ(-offset, UTF16IndexToOffset(s, j, i));
25 size_t adjusted_j = (j == the_invalid_index) ? j + 1 : j;
26 EXPECT_EQ(adjusted_j, UTF16OffsetToIndex(s, i, offset));
27 size_t adjusted_i = (i == the_invalid_index) ? i + 1 : i;
28 EXPECT_EQ(adjusted_i, UTF16OffsetToIndex(s, j, -offset));
29 }
30 }
31 }
32
33 } // namespace gfx
34