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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_I18N_CHAR_ITERATOR_H_ | |
| 6 #define BASE_I18N_CHAR_ITERATOR_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/i18n/base_i18n_export.h" | |
| 12 #include "base/strings/string16.h" | |
| 13 | |
| 14 // The CharIterator classes iterate through the characters in UTF8 and | |
| 15 // UTF16 strings. Example usage: | |
| 16 // | |
| 17 // UTF8CharIterator iter(&str); | |
| 18 // while (!iter.end()) { | |
| 19 // VLOG(1) << iter.get(); | |
| 20 // iter.Advance(); | |
| 21 // } | |
| 22 | |
| 23 #if defined(OS_WIN) | |
| 24 typedef unsigned char uint8_t; | |
| 25 #endif | |
| 26 | |
| 27 namespace base { | |
| 28 namespace i18n { | |
| 29 | |
| 30 class BASE_I18N_EXPORT UTF8CharIterator { | |
| 31 public: | |
| 32 // Requires |str| to live as long as the UTF8CharIterator does. | |
| 33 explicit UTF8CharIterator(const std::string* str); | |
| 34 ~UTF8CharIterator(); | |
| 35 | |
| 36 // Return the starting array index of the current character within the | |
| 37 // string. | |
| 38 int32 array_pos() const { return array_pos_; } | |
| 39 | |
| 40 // Return the logical index of the current character, independent of the | |
| 41 // number of bytes each character takes. | |
| 42 int32 char_pos() const { return char_pos_; } | |
| 43 | |
| 44 // Return the current char. | |
| 45 int32 get() const { return char_; } | |
| 46 | |
| 47 // Returns true if we're at the end of the string. | |
| 48 bool end() const { return array_pos_ == len_; } | |
| 49 | |
| 50 // Advance to the next actual character. Returns false if we're at the | |
| 51 // end of the string. | |
| 52 bool Advance(); | |
| 53 | |
| 54 private: | |
| 55 // The string we're iterating over. | |
| 56 const uint8_t* str_; | |
| 57 | |
| 58 // The length of the encoded string. | |
| 59 int32 len_; | |
| 60 | |
| 61 // Array index. | |
| 62 int32 array_pos_; | |
| 63 | |
| 64 // The next array index. | |
| 65 int32 next_pos_; | |
| 66 | |
| 67 // Character index. | |
| 68 int32 char_pos_; | |
| 69 | |
| 70 // The current character. | |
| 71 int32 char_; | |
| 72 | |
| 73 DISALLOW_COPY_AND_ASSIGN(UTF8CharIterator); | |
| 74 }; | |
| 75 | |
| 76 class BASE_I18N_EXPORT UTF16CharIterator { | |
| 77 public: | |
| 78 // Requires |str| to live as long as the UTF16CharIterator does. | |
| 79 explicit UTF16CharIterator(const string16* str); | |
| 80 UTF16CharIterator(const char16* str, size_t str_len); | |
| 81 ~UTF16CharIterator(); | |
| 82 | |
| 83 // Return the starting array index of the current character within the | |
| 84 // string. | |
| 85 int32 array_pos() const { return array_pos_; } | |
| 86 | |
| 87 // Return the logical index of the current character, independent of the | |
| 88 // number of codewords each character takes. | |
| 89 int32 char_pos() const { return char_pos_; } | |
| 90 | |
| 91 // Return the current char. | |
| 92 int32 get() const { return char_; } | |
| 93 | |
| 94 // Returns true if we're at the end of the string. | |
| 95 bool end() const { return array_pos_ == len_; } | |
| 96 | |
| 97 // Advance to the next actual character. Returns false if we're at the | |
| 98 // end of the string. | |
| 99 bool Advance(); | |
| 100 | |
| 101 private: | |
| 102 // Fills in the current character we found and advances to the next | |
| 103 // character, updating all flags as necessary. | |
| 104 void ReadChar(); | |
| 105 | |
| 106 // The string we're iterating over. | |
| 107 const char16* str_; | |
| 108 | |
| 109 // The length of the encoded string. | |
| 110 int32 len_; | |
| 111 | |
| 112 // Array index. | |
| 113 int32 array_pos_; | |
| 114 | |
| 115 // The next array index. | |
| 116 int32 next_pos_; | |
| 117 | |
| 118 // Character index. | |
| 119 int32 char_pos_; | |
| 120 | |
| 121 // The current character. | |
| 122 int32 char_; | |
| 123 | |
| 124 DISALLOW_COPY_AND_ASSIGN(UTF16CharIterator); | |
| 125 }; | |
| 126 | |
| 127 } // namespace i18n | |
| 128 } // namespace base | |
| 129 | |
| 130 #endif // BASE_I18N_CHAR_ITERATOR_H_ | |
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