1 ///////////////////////////////////////////////////////////////////////////////////////////////
2 // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
3 // Copyright (C) 2001-2024 the original author or authors.
4 //
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Lesser General Public
7 // License as published by the Free Software Foundation; either
8 // version 2.1 of the License, or (at your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Lesser General Public License for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 ///////////////////////////////////////////////////////////////////////////////////////////////
19
20 package com.puppycrawl.tools.checkstyle.utils;
21
22 import java.util.Arrays;
23
24 /**
25 * Contains utility methods for code point.
26 */
27 public final class CodePointUtil {
28
29 /** Stop instances being created. **/
30 private CodePointUtil() {
31 }
32
33 /**
34 * Checks if given code point array is blank by either being empty,
35 * or contains only whitespace characters.
36 *
37 * @param codePoints The array of unicode code points of string to check.
38 * @return true if codePoints is blank.
39 */
40 public static boolean isBlank(int... codePoints) {
41 return hasWhitespaceBefore(codePoints.length, codePoints);
42 }
43
44 /**
45 * Checks if the given code point array contains only whitespace up to specified index.
46 *
47 * @param codePoints
48 * array of Unicode code point of string to check
49 * @param index
50 * index to check up to (exclusive)
51 * @return true if all code points preceding given index are whitespace
52 */
53 public static boolean hasWhitespaceBefore(int index, int... codePoints) {
54 return Arrays.stream(codePoints, 0, index)
55 .allMatch(Character::isWhitespace);
56 }
57
58 /**
59 * Removes trailing whitespaces.
60 *
61 * @param codePoints array of unicode code points
62 * @return unicode code points array with trailing whitespaces removed
63 */
64 public static int[] stripTrailing(int... codePoints) {
65 int lastIndex = codePoints.length;
66 while (CommonUtil.isCodePointWhitespace(codePoints, lastIndex - 1)) {
67 lastIndex--;
68 }
69 return Arrays.copyOfRange(codePoints, 0, lastIndex);
70 }
71
72 /**
73 * Tests if the unicode code points array
74 * ends with the specified suffix.
75 *
76 * @param suffix the suffix
77 * @param codePoints the array of unicode code points to check
78 * @return {@code true}, if the unicode code points array ends with provided suffix
79 */
80 public static boolean endsWith(int[] codePoints, String suffix) {
81 final int startIndex = codePoints.length - suffix.length();
82 return startIndex > -1 && Arrays.equals(Arrays
83 .copyOfRange(codePoints, startIndex, codePoints.length),
84 suffix.codePoints().toArray());
85 }
86 }