ui/gfx/utf16_indexing_unittest.cc

   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
  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