org.sonar.plugins.cxx.highlighter.SourceFileOffsets.java Source code

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Here is the source code for org.sonar.plugins.cxx.highlighter.SourceFileOffsets.java

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/*
 * Sonar C++ Plugin (Community)
 * Copyright (C) 2010 Neticoa SAS France
 * dev@sonar.codehaus.org
 *
 * 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.plugins.cxx.highlighter;

import com.google.common.collect.Lists;
import com.google.common.io.Files;
import com.sonar.sslr.api.Token;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.List;

public class SourceFileOffsets {
    private final int length;
    private final List<Integer> lineStartOffsets = Lists.newArrayList();

    public SourceFileOffsets(String content) {
        this.length = content.length();
        initOffsets(content);
    }

    public SourceFileOffsets(File file, Charset charset) {
        this(fileContent(file, charset));
    }

    private static String fileContent(File file, Charset charset) {
        String fileContent;
        try {
            fileContent = Files.toString(file, charset);
        } catch (IOException e) {
            throw new IllegalStateException("Could not read " + file, e);
        }
        return fileContent;
    }

    private void initOffsets(String toParse) {
        lineStartOffsets.add(0);
        int i = 0;
        while (i < length) {
            if (toParse.charAt(i) == '\n' || toParse.charAt(i) == '\r') {
                int nextLineStartOffset = i + 1;
                if (i < (length - 1) && toParse.charAt(i) == '\r' && toParse.charAt(i + 1) == '\n') {
                    nextLineStartOffset = i + 2;
                    i++;
                }
                lineStartOffsets.add(nextLineStartOffset);
            }
            i++;
        }
    }

    public int startOffset(Token token) {
        int lineStartOffset = lineStartOffsets.get(token.getLine() - 1);
        int column = token.getColumn();
        return lineStartOffset + column;
    }

    public int endOffset(Token token) {
        return startOffset(token) + token.getValue().length();
    }
}