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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 BASE_UTF_OFFSET_STRING_CONVERSIONS_H_ | 5 #ifndef BASE_UTF_OFFSET_STRING_CONVERSIONS_H_ |
6 #define BASE_UTF_OFFSET_STRING_CONVERSIONS_H_ | 6 #define BASE_UTF_OFFSET_STRING_CONVERSIONS_H_ |
7 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <string> | 9 #include <string> |
10 #include <vector> | 10 #include <vector> |
11 | 11 |
12 #include "base/base_api.h" | 12 #include "base/base_export.h" |
13 #include "base/string16.h" | 13 #include "base/string16.h" |
14 | 14 |
15 namespace base { | 15 namespace base { |
16 class StringPiece; | 16 class StringPiece; |
17 } | 17 } |
18 | 18 |
19 // Like the conversions in utf_string_conversions.h, but also takes one or more | 19 // Like the conversions in utf_string_conversions.h, but also takes one or more |
20 // offsets (|offset[s]_for_adjustment|) into the source strings, each offset | 20 // offsets (|offset[s]_for_adjustment|) into the source strings, each offset |
21 // will be adjusted to point at the same logical place in the result strings. | 21 // will be adjusted to point at the same logical place in the result strings. |
22 // If this isn't possible because an offset points past the end of the source | 22 // If this isn't possible because an offset points past the end of the source |
23 // strings or into the middle of a multibyte sequence, the offending offset will | 23 // strings or into the middle of a multibyte sequence, the offending offset will |
24 // be set to string16::npos. |offset[s]_for_adjustment| may be NULL. | 24 // be set to string16::npos. |offset[s]_for_adjustment| may be NULL. |
25 BASE_API bool UTF8ToUTF16AndAdjustOffset(const char* src, | 25 BASE_EXPORT bool UTF8ToUTF16AndAdjustOffset(const char* src, |
26 size_t src_len, | 26 size_t src_len, |
27 string16* output, | 27 string16* output, |
28 size_t* offset_for_adjustment); | 28 size_t* offset_for_adjustment); |
29 BASE_API bool UTF8ToUTF16AndAdjustOffsets( | 29 BASE_EXPORT bool UTF8ToUTF16AndAdjustOffsets( |
30 const char* src, | 30 const char* src, |
31 size_t src_len, | 31 size_t src_len, |
32 string16* output, | 32 string16* output, |
33 std::vector<size_t>* offsets_for_adjustment); | 33 std::vector<size_t>* offsets_for_adjustment); |
34 | 34 |
35 BASE_API string16 UTF8ToUTF16AndAdjustOffset(const base::StringPiece& utf8, | 35 BASE_EXPORT string16 UTF8ToUTF16AndAdjustOffset(const base::StringPiece& utf8, |
36 size_t* offset_for_adjustment); | 36 size_t* offset_for_adjustment); |
37 BASE_API string16 UTF8ToUTF16AndAdjustOffsets( | 37 BASE_EXPORT string16 UTF8ToUTF16AndAdjustOffsets( |
38 const base::StringPiece& utf8, | 38 const base::StringPiece& utf8, |
39 std::vector<size_t>* offsets_for_adjustment); | 39 std::vector<size_t>* offsets_for_adjustment); |
40 | 40 |
41 // Limiting function callable by std::for_each which will replace any value | 41 // Limiting function callable by std::for_each which will replace any value |
42 // which is equal to or greater than |limit| with npos. | 42 // which is equal to or greater than |limit| with npos. |
43 template <typename T> | 43 template <typename T> |
44 struct LimitOffset { | 44 struct LimitOffset { |
45 explicit LimitOffset(size_t limit) | 45 explicit LimitOffset(size_t limit) |
46 : limit_(limit) {} | 46 : limit_(limit) {} |
47 | 47 |
48 void operator()(size_t& offset) { | 48 void operator()(size_t& offset) { |
49 if (offset >= limit_) | 49 if (offset >= limit_) |
50 offset = T::npos; | 50 offset = T::npos; |
51 } | 51 } |
52 | 52 |
53 size_t limit_; | 53 size_t limit_; |
54 }; | 54 }; |
55 | 55 |
56 // Stack object which, on destruction, will update a vector of offsets based on | 56 // Stack object which, on destruction, will update a vector of offsets based on |
57 // any supplied adjustments. To use, declare one of these, providing the | 57 // any supplied adjustments. To use, declare one of these, providing the |
58 // address of the offset vector to adjust. Then Add() any number of Adjustments | 58 // address of the offset vector to adjust. Then Add() any number of Adjustments |
59 // (each Adjustment gives the |original_offset| of a substring and the lengths | 59 // (each Adjustment gives the |original_offset| of a substring and the lengths |
60 // of the substring before and after transforming). When the OffsetAdjuster | 60 // of the substring before and after transforming). When the OffsetAdjuster |
61 // goes out of scope, all the offsets in the provided vector will be updated. | 61 // goes out of scope, all the offsets in the provided vector will be updated. |
62 class BASE_API OffsetAdjuster { | 62 class BASE_EXPORT OffsetAdjuster { |
63 public: | 63 public: |
64 struct BASE_API Adjustment { | 64 struct BASE_EXPORT Adjustment { |
65 Adjustment(size_t original_offset, | 65 Adjustment(size_t original_offset, |
66 size_t original_length, | 66 size_t original_length, |
67 size_t output_length); | 67 size_t output_length); |
68 | 68 |
69 size_t original_offset; | 69 size_t original_offset; |
70 size_t original_length; | 70 size_t original_length; |
71 size_t output_length; | 71 size_t output_length; |
72 }; | 72 }; |
73 | 73 |
74 explicit OffsetAdjuster(std::vector<size_t>* offsets_for_adjustment); | 74 explicit OffsetAdjuster(std::vector<size_t>* offsets_for_adjustment); |
75 ~OffsetAdjuster(); | 75 ~OffsetAdjuster(); |
76 | 76 |
77 void Add(const Adjustment& adjustment); | 77 void Add(const Adjustment& adjustment); |
78 | 78 |
79 private: | 79 private: |
80 void AdjustOffset(std::vector<size_t>::iterator offset); | 80 void AdjustOffset(std::vector<size_t>::iterator offset); |
81 | 81 |
82 std::vector<size_t>* offsets_for_adjustment_; | 82 std::vector<size_t>* offsets_for_adjustment_; |
83 std::vector<Adjustment> adjustments_; | 83 std::vector<Adjustment> adjustments_; |
84 }; | 84 }; |
85 | 85 |
86 #endif // BASE_UTF_OFFSET_STRING_CONVERSIONS_H_ | 86 #endif // BASE_UTF_OFFSET_STRING_CONVERSIONS_H_ |
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