-
Notifications
You must be signed in to change notification settings - Fork 3
/
StringUtils.java
97 lines (83 loc) · 3.23 KB
/
StringUtils.java
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
/*
* Copyright (c) 2006-2014 DMDirc Developers
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.dmdirc.util;
/**
* Utilities for dealing with strings.
*/
public final class StringUtils {
private StringUtils() {
// Shouldn't be instansiated.
}
/**
* Returns the indexes for the word surrounding the index in the specified string.
*
* @param text Text to get word from
* @param index Index to get surrounding word
*
* @return An array containing two elements: the index of the first character of the word, and
* the index of the first character beyond the end of the word. If the specified index is not
* contained within a word (i.e., is whitespace) then 0,0 is returned.
*/
public static int[] indiciesOfWord(final CharSequence text, final int index) {
final int start = indexOfStartOfWord(text, index);
final int end = indexOfEndOfWord(text, index);
if (start > end) {
return new int[]{0, 0};
}
return new int[]{start, end};
}
/**
* Returns the start index for the word surrounding the index in the specified string.
*
* @param text Text to get word from
* @param index Index to get surrounding word
*
* @return Start index of the word surrounding the index
*/
public static int indexOfStartOfWord(final CharSequence text, final int index) {
int start = index;
// Traverse backwards
while (start > 0 && start < text.length() && text.charAt(start) != ' ') {
start--;
}
if (start + 1 < text.length() && text.charAt(start) == ' ') {
start++;
}
return start;
}
/**
* Returns the end index for the word surrounding the index in the specified string.
*
* @param text Text to get word from
* @param index Index to get surrounding word
*
* @return End index of the word surrounding the index
*/
public static int indexOfEndOfWord(final CharSequence text, final int index) {
int end = index;
// And forwards
while (end < text.length() && end >= 0 && text.charAt(end) != ' ') {
end++;
}
return end;
}
}