blob: edc8950127e859bddcb1c05c2799b00eec51d695 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/i18n/break_iterator.h"
#include "base/logging.h"
#include "unicode/ubrk.h"
#include "unicode/uchar.h"
#include "unicode/ustring.h"
namespace base {
const size_t npos = -1;
BreakIterator::BreakIterator(const string16* str, BreakType break_type)
: iter_(NULL),
string_(str),
break_type_(break_type),
prev_(npos),
pos_(0) {
}
BreakIterator::~BreakIterator() {
if (iter_)
ubrk_close(static_cast<UBreakIterator*>(iter_));
}
bool BreakIterator::Init() {
UErrorCode status = U_ZERO_ERROR;
UBreakIteratorType break_type;
switch (break_type_) {
case BREAK_WORD:
break_type = UBRK_WORD;
break;
case BREAK_LINE:
case BREAK_NEWLINE:
break_type = UBRK_LINE;
break;
default:
NOTREACHED() << "invalid break_type_";
return false;
}
iter_ = ubrk_open(break_type, NULL,
string_->data(), static_cast<int32_t>(string_->size()),
&status);
if (U_FAILURE(status)) {
NOTREACHED() << "ubrk_open failed";
return false;
}
// Move the iterator to the beginning of the string.
ubrk_first(static_cast<UBreakIterator*>(iter_));
return true;
}
bool BreakIterator::Advance() {
int32_t pos;
int32_t status;
prev_ = pos_;
switch (break_type_) {
case BREAK_WORD:
case BREAK_LINE:
pos = ubrk_next(static_cast<UBreakIterator*>(iter_));
if (pos == UBRK_DONE) {
pos_ = npos;
return false;
}
pos_ = static_cast<size_t>(pos);
return true;
case BREAK_NEWLINE:
do {
pos = ubrk_next(static_cast<UBreakIterator*>(iter_));
if (pos == UBRK_DONE) {
break;
}
pos_ = static_cast<size_t>(pos);
status = ubrk_getRuleStatus(static_cast<UBreakIterator*>(iter_));
} while (status >= UBRK_LINE_SOFT && status < UBRK_LINE_SOFT_LIMIT);
if (pos == UBRK_DONE && prev_ == pos_) {
pos_ = npos;
return false;
}
return true;
default:
NOTREACHED() << "invalid break_type_";
return false;
}
}
bool BreakIterator::IsWord() const {
return (break_type_ == BREAK_WORD &&
ubrk_getRuleStatus(static_cast<UBreakIterator*>(iter_)) !=
UBRK_WORD_NONE);
}
string16 BreakIterator::GetString() const {
DCHECK(prev_ != npos && pos_ != npos);
return string_->substr(prev_, pos_ - prev_);
}
} // namespace base
|
