org.sonar.java.parser.sslr.Input Maven / Gradle / Ivy
/*
* SonarQube Java
* Copyright (C) 2012 SonarSource
* [email protected]
*
* 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 02
*/
package org.sonar.java.parser.sslr;
import com.google.common.collect.Lists;
import java.io.File;
import java.net.URI;
import java.util.Arrays;
import java.util.List;
public class Input {
private static final URI FAKE_URI = new File("tests://unittests").toURI();
private final char[] input;
private final URI uri;
private final int[] newLineIndexes;
public Input(char[] input) {
this(input, FAKE_URI);
}
public Input(char[] input, URI uri) {
this.input = input;
this.uri = uri;
List newLineIndexesBuilder = Lists.newArrayList();
for (int i = 0; i < input.length; i++) {
if (isNewLine(input, i)) {
newLineIndexesBuilder.add(i + 1);
}
}
this.newLineIndexes = new int[newLineIndexesBuilder.size()];
for (int i = 0; i < newLineIndexes.length; i++) {
this.newLineIndexes[i] = newLineIndexesBuilder.get(i);
}
}
public char[] input() {
return input;
}
public URI uri() {
return uri;
}
public String substring(int from, int to) {
StringBuilder sb = new StringBuilder();
for (int i = from; i < to; i++) {
sb.append(input[i]);
}
return sb.toString();
}
public int[] lineAndColumnAt(int index) {
int[] result = new int[2];
result[0] = lineAt(index);
result[1] = index - lineStartIndex(result[0]) + 1;
return result;
}
private int lineAt(int index) {
int i = Arrays.binarySearch(newLineIndexes, index);
return i >= 0 ? i + 2 : -i;
}
private int lineStartIndex(int line) {
return line == 1 ? 0 : newLineIndexes[line - 2];
}
/**
* New lines are: \n, \r\n (in which case true is returned for the \n) and \r alone.
*/
private static final boolean isNewLine(char[] input, int i) {
return input[i] == '\n' ||
input[i] == '\r' && (i + 1 == input.length || input[i + 1] != '\n');
}
}