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- // Copyright (c) 2012 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include <stddef.h>
- #include "testing/gtest/include/gtest/gtest.h"
- #include "ui/gfx/utf16_indexing.h"
- namespace gfx {
- TEST(UTF16IndexingTest, IndexOffsetConversions) {
- // Valid surrogate pair surrounded by unpaired surrogates
- const char16_t foo[] = {0xDC00, 0xD800, 0xD800, 0xDFFF, 0xDFFF, 0xDBFF, 0};
- const std::u16string s(foo);
- const size_t the_invalid_index = 3;
- for (size_t i = 0; i <= s.length(); ++i)
- EXPECT_EQ(i != the_invalid_index, IsValidCodePointIndex(s, i));
- for (size_t i = 0; i <= s.length(); ++i) {
- for (size_t j = i; j <= s.length(); ++j) {
- ptrdiff_t offset = static_cast<ptrdiff_t>(j - i);
- if (i <= the_invalid_index && j > the_invalid_index)
- --offset;
- EXPECT_EQ(offset, UTF16IndexToOffset(s, i, j));
- EXPECT_EQ(-offset, UTF16IndexToOffset(s, j, i));
- size_t adjusted_j = (j == the_invalid_index) ? j + 1 : j;
- EXPECT_EQ(adjusted_j, UTF16OffsetToIndex(s, i, offset));
- size_t adjusted_i = (i == the_invalid_index) ? i + 1 : i;
- EXPECT_EQ(adjusted_i, UTF16OffsetToIndex(s, j, -offset));
- }
- }
- }
- } // namespace gfx
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