blob: ba087ccc4614cc653358b61b5f3768bd35b76e8a (
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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
// Default character BreakIterator.
/* Copyright (C) 1999 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package gnu.gcj.text;
import java.text.BreakIterator;
import java.text.CharacterIterator;
/**
* @author Tom Tromey <tromey@cygnus.com>
* @date March 19, 1999
* Written using The Unicode Standard, Version 2.0.
*/
public class CharacterBreakIterator extends BaseBreakIterator
{
// Hangul Jamo constants from Unicode book.
private static final int LBase = 0x1100;
private static final int VBase = 0x1161;
private static final int TBase = 0x11a7;
private static final int LCount = 19;
private static final int VCount = 21;
private static final int TCount = 28;
// Information about surrogates.
private static final int highSurrogateStart = 0xD800;
private static final int highSurrogateEnd = 0xDBFF;
private static final int lowSurrogateStart = 0xDC00;
private static final int lowSurrogateEnd = 0xDFFF;
public Object clone ()
{
return new CharacterBreakIterator (this);
}
public CharacterBreakIterator ()
{
iter = null; // FIXME?
}
private CharacterBreakIterator (CharacterBreakIterator other)
{
iter = (CharacterIterator) other.iter.clone();
}
// Some methods to tell us different properties of characters.
private final boolean isL (char c)
{
return c >= LBase && c <= LBase + LCount;
}
private final boolean isV (char c)
{
return c >= VBase && c <= VBase + VCount;
}
private final boolean isT (char c)
{
return c >= TBase && c <= TBase + TCount;
}
private final boolean isLVT (char c)
{
return isL (c) || isV (c) || isT (c);
}
private final boolean isHighSurrogate (char c)
{
return c >= highSurrogateStart && c <= highSurrogateEnd;
}
private final boolean isLowSurrogate (char c)
{
return c >= lowSurrogateStart && c <= lowSurrogateEnd;
}
public int next ()
{
int end = iter.getEndIndex();
if (iter.getIndex() == end)
return DONE;
char c;
for (char prev = CharacterIterator.DONE; iter.getIndex() < end; prev = c)
{
c = iter.next();
if (c == CharacterIterator.DONE)
break;
int type = Character.getType(c);
// Break after paragraph separators.
if (type == Character.PARAGRAPH_SEPARATOR)
break;
// Now we need some lookahead.
char ahead = iter.next();
iter.previous();
if (ahead == CharacterIterator.DONE)
break;
int aheadType = Character.getType(ahead);
if (aheadType != Character.NON_SPACING_MARK
&& ! isLowSurrogate (ahead)
&& ! isLVT (ahead))
break;
if (! isLVT (c) && isLVT (ahead))
break;
if (isL (c) && ! isLVT (ahead)
&& aheadType != Character.NON_SPACING_MARK)
break;
if (isV (c) && ! isV (ahead) && !isT (ahead)
&& aheadType != Character.NON_SPACING_MARK)
break;
if (isT (c) && ! isT (ahead)
&& aheadType != Character.NON_SPACING_MARK)
break;
if (! isHighSurrogate (c) && isLowSurrogate (ahead))
break;
if (isHighSurrogate (c) && ! isLowSurrogate (ahead))
break;
if (! isHighSurrogate (prev) && isLowSurrogate (c))
break;
}
return iter.getIndex();
}
public int previous ()
{
if (iter.getIndex() == iter.getBeginIndex())
return DONE;
int start = iter.getBeginIndex();
while (iter.getIndex() >= iter.getBeginIndex())
{
char c = iter.previous();
if (c == CharacterIterator.DONE)
break;
int type = Character.getType(c);
if (type != Character.NON_SPACING_MARK
&& ! isLowSurrogate (c)
&& ! isLVT (c))
break;
// Now we need some lookahead.
char ahead = iter.previous();
if (ahead == CharacterIterator.DONE)
{
iter.next();
break;
}
char ahead2 = iter.previous();
iter.next();
iter.next();
if (ahead2 == CharacterIterator.DONE)
break;
int aheadType = Character.getType(ahead);
if (aheadType == Character.PARAGRAPH_SEPARATOR)
break;
if (isLVT (c) && ! isLVT (ahead))
break;
if (! isLVT (c) && type != Character.NON_SPACING_MARK
&& isL (ahead))
break;
if (! isV (c) && ! isT (c) && type != Character.NON_SPACING_MARK
&& isV (ahead))
break;
if (! isT (c) && type != Character.NON_SPACING_MARK
&& isT (ahead))
break;
if (isLowSurrogate (c) && ! isHighSurrogate (ahead))
break;
if (! isLowSurrogate (c) && isHighSurrogate (ahead))
break;
if (isLowSurrogate (ahead) && ! isHighSurrogate (ahead2))
break;
}
return iter.getIndex();
}
}
|
