-
Notifications
You must be signed in to change notification settings - Fork 359
/
LocatedText.java
127 lines (110 loc) · 3.64 KB
/
LocatedText.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
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
/*
* C++ Community Plugin (cxx plugin)
* Copyright (C) 2022 SonarOpenCommunity
* http://github.com/SonarOpenCommunity/sonar-cxx
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* fork of SonarSource Language Recognizer: https://github.com/SonarSource/sslr
* Copyright (C) 2010-2021 SonarSource SA / mailto:info AT sonarsource DOT com / license: LGPL v3
*/
package org.sonar.cxx.sslr.internal.matchers;
import java.io.File;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.annotation.Nullable;
public class LocatedText implements CharSequence {
private static final int[] EMPTY_INT_ARRAY = new int[0];
private final File file;
private final URI uri;
private final char[] chars;
/**
* Indices of lines.
* Number of elements equal to number of line terminators.
*/
private final int[] lines;
public LocatedText(@Nullable File file, char[] chars) {
this.file = file;
this.uri = file == null ? null : file.toURI();
this.chars = chars;
this.lines = computeLines(chars);
}
@Override
public int length() {
return chars.length;
}
public char[] toChars() {
var chars = new char[length()];
System.arraycopy(this.chars, 0, chars, 0, chars.length);
return chars;
}
@Override
public char charAt(int index) {
return chars[index];
}
@Override
public CharSequence subSequence(int from, int to) {
throw new UnsupportedOperationException();
}
@Override
public String toString() {
return new String(toChars());
}
TextLocation getLocation(int index) {
if (index < 0 || index > length()) {
throw new IndexOutOfBoundsException();
}
int line = getLineNumber(index);
int column = index - getLineStart(line) + 1;
return new TextLocation(file, uri, line, column);
}
private int getLineNumber(int index) {
int i = Arrays.binarySearch(lines, index);
return i >= 0 ? (i + 2) : -i;
}
private int getLineStart(int line) {
return line == 1 ? 0 : lines[line - 2];
}
private static int[] computeLines(char[] chars) {
List<Integer> newlines = new ArrayList<>();
int i = 0;
while (i < chars.length) {
if (isEndOfLine(chars, i)) {
newlines.add(i + 1);
}
i++;
}
if (newlines.isEmpty()) {
return EMPTY_INT_ARRAY;
}
var lines = new int[newlines.size()];
for (i = 0; i < newlines.size(); i++) {
lines[i] = newlines.get(i);
}
return lines;
}
/**
* A line is considered to be terminated by any one of
* a line feed ({@code '\n'}), a carriage return ({@code '\r'}),
* or a carriage return followed immediately by a line feed ({@code "\r\n"}).
*/
private static boolean isEndOfLine(char[] buffer, int i) {
return buffer[i] == '\n' || buffer[i] == '\r' && (i + 1 < buffer.length && buffer[i + 1] != '\n' || i + 1
== buffer.length);
}
}