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      1 // Copyright (c) 2009 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 "base/logging.h"
      6 #include "base/string_piece.h"
      7 #include "base/utf_offset_string_conversions.h"
      8 #include "testing/gtest/include/gtest/gtest.h"
      9 
     10 namespace base {
     11 
     12 namespace {
     13 
     14 // Given a null-terminated string of wchar_t with each wchar_t representing
     15 // a UTF-16 code unit, returns a string16 made up of wchar_t's in the input.
     16 // Each wchar_t should be <= 0xFFFF and a non-BMP character (> U+FFFF)
     17 // should be represented as a surrogate pair (two UTF-16 units)
     18 // *even* where wchar_t is 32-bit (Linux and Mac).
     19 //
     20 // This is to help write tests for functions with string16 params until
     21 // the C++ 0x UTF-16 literal is well-supported by compilers.
     22 string16 BuildString16(const wchar_t* s) {
     23 #if defined(WCHAR_T_IS_UTF16)
     24   return string16(s);
     25 #elif defined(WCHAR_T_IS_UTF32)
     26   string16 u16;
     27   while (*s != 0) {
     28     DCHECK(static_cast<unsigned int>(*s) <= 0xFFFFu);
     29     u16.push_back(*s++);
     30   }
     31   return u16;
     32 #endif
     33 }
     34 
     35 }  // namespace
     36 
     37 TEST(UTFOffsetStringConversionsTest, AdjustOffset) {
     38   struct UTF8ToWideCase {
     39     const char* utf8;
     40     size_t input_offset;
     41     size_t output_offset;
     42   } utf8_to_wide_cases[] = {
     43     {"", 0, std::wstring::npos},
     44     {"\xe4\xbd\xa0\xe5\xa5\xbd", 1, std::wstring::npos},
     45     {"\xe4\xbd\xa0\xe5\xa5\xbd", 3, 1},
     46     {"\xed\xb0\x80z", 3, 1},
     47     {"A\xF0\x90\x8C\x80z", 1, 1},
     48     {"A\xF0\x90\x8C\x80z", 2, std::wstring::npos},
     49 #if defined(WCHAR_T_IS_UTF16)
     50     {"A\xF0\x90\x8C\x80z", 5, 3},
     51 #elif defined(WCHAR_T_IS_UTF32)
     52     {"A\xF0\x90\x8C\x80z", 5, 2},
     53 #endif
     54   };
     55   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(utf8_to_wide_cases); ++i) {
     56     size_t offset = utf8_to_wide_cases[i].input_offset;
     57     UTF8ToWideAndAdjustOffset(utf8_to_wide_cases[i].utf8, &offset);
     58     EXPECT_EQ(utf8_to_wide_cases[i].output_offset, offset);
     59   }
     60 
     61 #if defined(WCHAR_T_IS_UTF32)
     62   struct UTF16ToWideCase {
     63     const wchar_t* wide;
     64     size_t input_offset;
     65     size_t output_offset;
     66   } utf16_to_wide_cases[] = {
     67     {L"\xD840\xDC00\x4E00", 0, 0},
     68     {L"\xD840\xDC00\x4E00", 1, std::wstring::npos},
     69     {L"\xD840\xDC00\x4E00", 2, 1},
     70   };
     71   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(utf16_to_wide_cases); ++i) {
     72     size_t offset = utf16_to_wide_cases[i].input_offset;
     73     UTF16ToWideAndAdjustOffset(BuildString16(utf16_to_wide_cases[i].wide),
     74                                &offset);
     75     EXPECT_EQ(utf16_to_wide_cases[i].output_offset, offset);
     76   }
     77 #endif
     78 }
     79 
     80 }  // namaspace base
     81