1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.compatibility.common.util;
18 
19 import java.util.regex.Pattern;
20 
21 public class TextUtils {
TextUtils()22     private TextUtils() {
23     }
24 
25     /**
26      * Return the first section in {@code source} between the line matches
27      * {@code extractionStartRegex} and the line matches {@code extractionEndRegex}.
28      */
extractSection(String source, String extractionStartRegex, boolean startInclusive, String extractionEndRegex, boolean endInclusive)29     public static String extractSection(String source,
30             String extractionStartRegex, boolean startInclusive,
31             String extractionEndRegex, boolean endInclusive) {
32 
33         final Pattern start = Pattern.compile(extractionStartRegex);
34         final Pattern end = Pattern.compile(extractionEndRegex);
35 
36         final StringBuilder sb = new StringBuilder();
37         final String[] lines = source.split("\\n", -1);
38 
39         int i = 0;
40         for (; i < lines.length; i++) {
41             final String line = lines[i];
42             if (start.matcher(line).matches()) {
43                 if (startInclusive) {
44                     sb.append(line);
45                     sb.append('\n');
46                 }
47                 i++;
48                 break;
49             }
50         }
51 
52         for (; i < lines.length; i++) {
53             final String line = lines[i];
54             if (end.matcher(line).matches()) {
55                 if (endInclusive) {
56                     sb.append(line);
57                     sb.append('\n');
58                 }
59                 break;
60             }
61             sb.append(line);
62             sb.append('\n');
63         }
64         return sb.toString();
65     }
66 
67     /**
68      * Creates a string consisted of {@code size} chars {@code c}.
69      */
repeat(char c, int size)70     public static String repeat(char c, int size) {
71         StringBuilder builder = new StringBuilder(size);
72         for (int i = 1; i <= size; i++) {
73             builder.append(c);
74         }
75         return builder.toString();
76     }
77 }
78