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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 "base/i18n/break_iterator.h"
6 
7 #include "base/logging.h"
8 #include "unicode/ubrk.h"
9 #include "unicode/uchar.h"
10 #include "unicode/ustring.h"
11 
12 namespace base {
13 
14 const size_t npos = -1;
15 
BreakIterator(const string16 * str,BreakType break_type)16 BreakIterator::BreakIterator(const string16* str, BreakType break_type)
17     : iter_(NULL),
18       string_(str),
19       break_type_(break_type),
20       prev_(npos),
21       pos_(0) {
22 }
23 
~BreakIterator()24 BreakIterator::~BreakIterator() {
25   if (iter_)
26     ubrk_close(static_cast<UBreakIterator*>(iter_));
27 }
28 
Init()29 bool BreakIterator::Init() {
30   UErrorCode status = U_ZERO_ERROR;
31   UBreakIteratorType break_type;
32   switch (break_type_) {
33     case BREAK_WORD:
34       break_type = UBRK_WORD;
35       break;
36     case BREAK_LINE:
37     case BREAK_NEWLINE:
38       break_type = UBRK_LINE;
39       break;
40     default:
41       NOTREACHED() << "invalid break_type_";
42       return false;
43   }
44   iter_ = ubrk_open(break_type, NULL,
45                     string_->data(), static_cast<int32_t>(string_->size()),
46                     &status);
47   if (U_FAILURE(status)) {
48     NOTREACHED() << "ubrk_open failed";
49     return false;
50   }
51   // Move the iterator to the beginning of the string.
52   ubrk_first(static_cast<UBreakIterator*>(iter_));
53   return true;
54 }
55 
Advance()56 bool BreakIterator::Advance() {
57   int32_t pos;
58   int32_t status;
59   prev_ = pos_;
60   switch (break_type_) {
61     case BREAK_WORD:
62     case BREAK_LINE:
63       pos = ubrk_next(static_cast<UBreakIterator*>(iter_));
64       if (pos == UBRK_DONE) {
65         pos_ = npos;
66         return false;
67       }
68       pos_ = static_cast<size_t>(pos);
69       return true;
70     case BREAK_NEWLINE:
71       do {
72         pos = ubrk_next(static_cast<UBreakIterator*>(iter_));
73         if (pos == UBRK_DONE) {
74           break;
75         }
76         pos_ = static_cast<size_t>(pos);
77         status = ubrk_getRuleStatus(static_cast<UBreakIterator*>(iter_));
78       } while (status >= UBRK_LINE_SOFT && status < UBRK_LINE_SOFT_LIMIT);
79       if (pos == UBRK_DONE && prev_ == pos_) {
80         pos_ = npos;
81         return false;
82       }
83       return true;
84     default:
85       NOTREACHED() << "invalid break_type_";
86       return false;
87   }
88 }
89 
IsWord() const90 bool BreakIterator::IsWord() const {
91   return (break_type_ == BREAK_WORD &&
92           ubrk_getRuleStatus(static_cast<UBreakIterator*>(iter_)) !=
93           UBRK_WORD_NONE);
94 }
95 
GetString() const96 string16 BreakIterator::GetString() const {
97   DCHECK(prev_ != npos && pos_ != npos);
98   return string_->substr(prev_, pos_ - prev_);
99 }
100 
101 }  // namespace base
102