org.sonar.jproperties.checks.EndLineCharactersCheck.java Source code

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Here is the source code for org.sonar.jproperties.checks.EndLineCharactersCheck.java

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/*
 * SonarQube Java Properties Plugin
 * Copyright (C) 2015-2016 David RACODON
 * david.racodon@gmail.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.jproperties.checks;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.io.Files;

import java.io.IOException;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.regex.Pattern;

import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.check.RuleProperty;
import org.sonar.jproperties.visitors.CharsetAwareVisitor;
import org.sonar.plugins.jproperties.api.tree.PropertiesTree;
import org.sonar.plugins.jproperties.api.visitors.DoubleDispatchVisitorCheck;
import org.sonar.squidbridge.annotations.SqaleConstantRemediation;

@Rule(key = "end-line-characters", name = "End-line characters should be consistent", priority = Priority.MINOR, tags = {
        Tags.CONVENTION })
@SqaleConstantRemediation("5min")
public class EndLineCharactersCheck extends DoubleDispatchVisitorCheck implements CharsetAwareVisitor {

    private static final String DEFAULT_FORMAT = "LF";
    private Charset charset;

    @RuleProperty(key = "End-line character", description = "Allowed values: 'CR', 'CRLF', 'LF'", defaultValue = DEFAULT_FORMAT)
    private String endLineCharacters = DEFAULT_FORMAT;

    @Override
    public void visitProperties(PropertiesTree tree) {
        if (fileContainsIllegalEndLineCharacters()) {
            addFileIssue("Set all end-line characters to '" + endLineCharacters + "' in this file.");
        }
    }

    @Override
    public void validateParameters() {
        if (!Arrays.asList("CRLF", "CR", "LF").contains(endLineCharacters)) {
            throw new IllegalStateException(paramsErrorMessage());
        }
    }

    @Override
    public void setCharset(Charset charset) {
        this.charset = charset;
    }

    @VisibleForTesting
    void setEndLineCharacters(String endLineCharacters) {
        this.endLineCharacters = endLineCharacters;
    }

    private boolean fileContainsIllegalEndLineCharacters() {
        try {
            String fileContent = Files.toString(getContext().getFile(), charset);
            return "CR".equals(endLineCharacters) && Pattern.compile("(?s)\n").matcher(fileContent).find()
                    || "LF".equals(endLineCharacters) && Pattern.compile("(?s)\r").matcher(fileContent).find()
                    || "CRLF".equals(endLineCharacters)
                            && Pattern.compile("(?s)(\r(?!\n)|(?<!\r)\n)").matcher(fileContent).find();
        } catch (IOException e) {
            throw new IllegalStateException("Check jproperties:" + this.getClass().getAnnotation(Rule.class).key()
                    + ": File cannot be read.", e);
        }
    }

    private String paramsErrorMessage() {
        return CheckUtils.paramsErrorMessage(this.getClass(), "endLineCharacters parameter is not valid.\nActual: '"
                + endLineCharacters + "'\nExpected: 'CR' or 'CRLF' or 'LF'");
    }

}