1/*
 2 * Copyright (c) 2018, Daniel Gultsch All rights reserved.
 3 *
 4 * Redistribution and use in source and binary forms, with or without modification,
 5 * are permitted provided that the following conditions are met:
 6 *
 7 * 1. Redistributions of source code must retain the above copyright notice, this
 8 * list of conditions and the following disclaimer.
 9 *
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation and/or
12 * other materials provided with the distribution.
13 *
14 * 3. Neither the name of the copyright holder nor the names of its contributors
15 * may be used to endorse or promote products derived from this software without
16 * specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
25 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30package eu.siacs.conversations.utils;
31
32import android.text.Spannable;
33
34import java.util.ArrayList;
35import java.util.List;
36
37public class CharSequenceUtils {
38
39	private static int getStartIndex(CharSequence input) {
40		int length = input.length();
41		int index = 0;
42		while (Character.isWhitespace(input.charAt(index))) {
43			++index;
44			if (index >= length) {
45				break;
46			}
47		}
48		return index;
49	}
50
51	private static int getEndIndex(CharSequence input) {
52		int index = input.length() - 1;
53		while (Character.isWhitespace(input.charAt(index))) {
54			--index;
55			if (index < 0) {
56				break;
57			}
58		}
59		return index;
60	}
61
62	public static CharSequence trim(CharSequence input) {
63		int begin = getStartIndex(input);
64		int end = getEndIndex(input);
65		if (begin > end) {
66			return "";
67		} else {
68			return StylingHelper.subSequence(input, begin, end + 1);
69		}
70	}
71
72	public static List<CharSequence> split(Spannable charSequence, char c) {
73		List<CharSequence> out = new ArrayList<>();
74		int begin = 0;
75		for (int i = 0; i < charSequence.length(); ++i) {
76			if (charSequence.charAt(i) == c) {
77				out.add(StylingHelper.subSequence(charSequence, begin, i));
78				begin = ++i;
79			}
80		}
81		if (begin < charSequence.length()) {
82			out.add(StylingHelper.subSequence(charSequence, begin, charSequence.length()));
83		}
84		return out;
85	}
86}