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
8namespace gfx {
9
10TEST(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