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Side by Side Diff: ui/gfx/utf16_indexing.h

Issue 23498059: Remove last dependencies on ui/base from ui/gfx (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: last rebase Created 7 years, 2 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef UI_GFX_UTF16_INDEXING_H_ 5 #ifndef UI_GFX_UTF16_INDEXING_H_
6 #define UI_GFX_UTF16_INDEXING_H_ 6 #define UI_GFX_UTF16_INDEXING_H_
7 7
8 #include "base/strings/string16.h" 8 #include "base/strings/string16.h"
9 #include "ui/gfx/gfx_export.h" 9 #include "ui/gfx/gfx_export.h"
10 10
11 namespace gfx { 11 namespace gfx {
12 12
13 // Returns false if s[index-1] is a high surrogate and s[index] is a low 13 // Returns false if s[index-1] is a high surrogate and s[index] is a low
14 // surrogate, true otherwise. 14 // surrogate, true otherwise.
15 UI_EXPORT bool IsValidCodePointIndex(const string16& s, size_t index); 15 GFX_EXPORT bool IsValidCodePointIndex(const string16& s, size_t index);
16 16
17 // |UTF16IndexToOffset| returns the number of code points between |base| and 17 // |UTF16IndexToOffset| returns the number of code points between |base| and
18 // |pos| in the given string. |UTF16OffsetToIndex| returns the index that is 18 // |pos| in the given string. |UTF16OffsetToIndex| returns the index that is
19 // |offset| code points away from the given |base| index. These functions are 19 // |offset| code points away from the given |base| index. These functions are
20 // named after glib's |g_utf8_pointer_to_offset| and |g_utf8_offset_to_pointer|, 20 // named after glib's |g_utf8_pointer_to_offset| and |g_utf8_offset_to_pointer|,
21 // which perform the same function for UTF-8. As in glib, it is an error to 21 // which perform the same function for UTF-8. As in glib, it is an error to
22 // pass an |offset| that walks off the edge of the string. 22 // pass an |offset| that walks off the edge of the string.
23 // 23 //
24 // These functions attempt to deal with invalid use of UTF-16 surrogates in a 24 // These functions attempt to deal with invalid use of UTF-16 surrogates in a
25 // way that makes as much sense as possible: unpaired surrogates are treated as 25 // way that makes as much sense as possible: unpaired surrogates are treated as
26 // single characters, and if an argument index points to the middle of a valid 26 // single characters, and if an argument index points to the middle of a valid
27 // surrogate pair, it is treated as though it pointed to the end of that pair. 27 // surrogate pair, it is treated as though it pointed to the end of that pair.
28 // The index returned by |UTF16OffsetToIndex| never points to the middle of a 28 // The index returned by |UTF16OffsetToIndex| never points to the middle of a
29 // surrogate pair. 29 // surrogate pair.
30 // 30 //
31 // The following identities hold: 31 // The following identities hold:
32 // If |s| contains no surrogate pairs, then 32 // If |s| contains no surrogate pairs, then
33 // UTF16IndexToOffset(s, base, pos) == pos - base 33 // UTF16IndexToOffset(s, base, pos) == pos - base
34 // UTF16OffsetToIndex(s, base, offset) == base + offset 34 // UTF16OffsetToIndex(s, base, offset) == base + offset
35 // If |pos| does not point to the middle of a surrogate pair, then 35 // If |pos| does not point to the middle of a surrogate pair, then
36 // UTF16OffsetToIndex(s, base, UTF16IndexToOffset(s, base, pos)) == pos 36 // UTF16OffsetToIndex(s, base, UTF16IndexToOffset(s, base, pos)) == pos
37 // Always, 37 // Always,
38 // UTF16IndexToOffset(s, base, UTF16OffsetToIndex(s, base, ofs)) == ofs 38 // UTF16IndexToOffset(s, base, UTF16OffsetToIndex(s, base, ofs)) == ofs
39 // UTF16IndexToOffset(s, i, j) == -UTF16IndexToOffset(s, j, i) 39 // UTF16IndexToOffset(s, i, j) == -UTF16IndexToOffset(s, j, i)
40 UI_EXPORT ptrdiff_t UTF16IndexToOffset(const string16& s, 40 GFX_EXPORT ptrdiff_t UTF16IndexToOffset(const string16& s,
41 size_t base, 41 size_t base,
42 size_t pos); 42 size_t pos);
43 UI_EXPORT size_t UTF16OffsetToIndex(const string16& s, 43 GFX_EXPORT size_t UTF16OffsetToIndex(const string16& s,
44 size_t base, 44 size_t base,
45 ptrdiff_t offset); 45 ptrdiff_t offset);
46 46
47 } // namespace gfx 47 } // namespace gfx
48 48
49 #endif // UI_GFX_UTF16_INDEXING_H_ 49 #endif // UI_GFX_UTF16_INDEXING_H_
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