org.sonar.plugins.protobuf.api.visitors.AbstractHighlighterVisitor.java Source code

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Here is the source code for org.sonar.plugins.protobuf.api.visitors.AbstractHighlighterVisitor.java

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/*
 * SonarQube Protocol Buffers Plugin
 * Copyright (C) 2015 SonarSource
 * sonarqube@googlegroups.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  02
 */
package org.sonar.plugins.protobuf.api.visitors;

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

import org.sonar.api.batch.fs.FileSystem;
import org.sonar.api.batch.fs.InputFile;
import org.sonar.api.component.ResourcePerspectives;
import org.sonar.plugins.protobuf.api.tree.lexical.SyntaxToken;

import com.google.common.base.Throwables;
import com.google.common.collect.Lists;
import com.google.common.io.Files;

public class AbstractHighlighterVisitor extends ProtoBufVisitorCheck {

    protected final ResourcePerspectives resourcePerspectives;
    protected final FileSystem fs;
    protected final Charset charset;

    protected List<Integer> lineStart;

    public AbstractHighlighterVisitor(ResourcePerspectives resourcePerspectives, FileSystem fs) {
        this.resourcePerspectives = resourcePerspectives;
        this.fs = fs;
        this.charset = fs.encoding();
    }

    protected InputFile inputFromIOFile(File file) {
        return fs.inputFile(fs.predicates().is(file));
    }

    protected int start(SyntaxToken token) {
        return getOffset(token.line(), token.column());
    }

    protected int end(SyntaxToken token) {
        return getOffset(token.line(), token.column()) + token.text().length();
    }

    /**
     * @param line starts from 1
     * @param column starts from 0
     */
    protected int getOffset(int line, int column) {
        return lineStart.get(line - 1) + column;
    }

    static List<Integer> startLines(File file, Charset charset) {
        List<Integer> startLines = Lists.newArrayList();
        final String content;
        try {
            content = Files.toString(file, charset);
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }
        startLines.add(0);
        for (int i = 0; i < content.length(); i++) {
            if (content.charAt(i) == '\n'
                    || (content.charAt(i) == '\r' && i + 1 < content.length() && content.charAt(i + 1) != '\n')) {
                startLines.add(i + 1);
            }
        }
        return startLines;
    }

}