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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 #include "ui/accessibility/ax_text_utils.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "base/strings/string_util.h" | |
| 9 | |
| 10 namespace ui { | |
| 11 | |
| 12 size_t FindAccessibleTextBoundary(const base::string16& text, | |
| 13 const std::vector<int>& line_breaks, | |
| 14 TextBoundaryType boundary, | |
| 15 size_t start_offset, | |
| 16 TextBoundaryDirection direction) { | |
| 17 size_t text_size = text.size(); | |
| 18 DCHECK(start_offset <= text_size); | |
| 19 | |
| 20 if (boundary == CHAR_BOUNDARY) { | |
| 21 if (direction == FORWARDS_DIRECTION && start_offset < text_size) | |
| 22 return start_offset + 1; | |
| 23 else | |
| 24 return start_offset; | |
| 25 } else if (boundary == LINE_BOUNDARY) { | |
| 26 if (direction == FORWARDS_DIRECTION) { | |
| 27 for (size_t j = 0; j < line_breaks.size(); ++j) { | |
| 28 size_t line_break = line_breaks[j] >= 0 ? line_breaks[j] : 0; | |
| 29 if (line_break > start_offset) | |
| 30 return line_break; | |
| 31 } | |
| 32 return text_size; | |
| 33 } else { | |
| 34 for (size_t j = line_breaks.size(); j != 0; --j) { | |
| 35 size_t line_break = line_breaks[j - 1] >= 0 ? line_breaks[j - 1] : 0; | |
| 36 if (line_break <= start_offset) | |
| 37 return line_break; | |
| 38 } | |
| 39 return 0; | |
| 40 } | |
| 41 } | |
| 42 | |
| 43 size_t result = start_offset; | |
| 44 for (;;) { | |
| 45 size_t pos; | |
| 46 if (direction == FORWARDS_DIRECTION) { | |
| 47 if (result >= text_size) | |
| 48 return text_size; | |
| 49 pos = result; | |
| 50 } else { | |
| 51 if (result == 0) | |
| 52 return 0; | |
| 53 pos = result - 1; | |
| 54 } | |
| 55 | |
| 56 switch (boundary) { | |
| 57 case CHAR_BOUNDARY: | |
| 58 case LINE_BOUNDARY: | |
| 59 NOTREACHED(); // These are handled above. | |
| 60 break; | |
| 61 case WORD_BOUNDARY: | |
| 62 if (IsWhitespace(text[pos])) | |
| 63 return result; | |
| 64 break; | |
| 65 case PARAGRAPH_BOUNDARY: | |
| 66 if (text[pos] == '\n') | |
| 67 return result; | |
| 68 break; | |
| 69 case SENTENCE_BOUNDARY: | |
| 70 if ((text[pos] == '.' || text[pos] == '!' || text[pos] == '?') && | |
| 71 (pos == text_size - 1 || IsWhitespace(text[pos + 1]))) { | |
| 72 return result; | |
| 73 } | |
| 74 break; | |
| 75 case ALL_BOUNDARY: | |
| 76 default: | |
| 77 break; | |
| 78 } | |
| 79 | |
| 80 if (direction == FORWARDS_DIRECTION) { | |
| 81 result++; | |
| 82 } else { | |
| 83 result--; | |
| 84 } | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 } // Namespace ui | |
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