org.sonar.sslr.internal.text.LocatedText.java Source code

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Here is the source code for org.sonar.sslr.internal.text.LocatedText.java

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/*
 * SonarSource Language Recognizer
 * Copyright (C) 2010-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * 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.
 */
package org.sonar.sslr.internal.text;

import com.google.common.base.Preconditions;
import org.sonar.sslr.text.TextLocation;

import javax.annotation.Nullable;

import java.io.File;
import java.net.URI;
import java.util.Arrays;

public class LocatedText extends PlainText {

    private final File file;
    private final URI uri;

    /**
     * Indices of lines.
     * Number of elements equal to number of line terminators.
     */
    private final int[] lines;

    public LocatedText(@Nullable File file, char[] chars) {
        super(chars);
        this.file = file;
        this.uri = file == null ? null : file.toURI();
        this.lines = TextUtils.computeLines(chars);
    }

    @Override
    public TextLocation getLocation(int index) {
        Preconditions.checkPositionIndex(index, length());
        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];
    }

}