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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 base::char16 foo[] =
{0xDC00, 0xD800, 0xD800, 0xDFFF, 0xDFFF, 0xDBFF, 0};
const base::string16 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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