org.sonar.java.checks.LambdaOptionalParenthesisCheck Maven / Gradle / Ivy

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/*
 * 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.checks;

import com.sonar.sslr.api.AstNode;
import com.sonar.sslr.squid.checks.SquidCheck;
import org.sonar.check.BelongsToProfile;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.java.ast.api.JavaPunctuator;
import org.sonar.java.ast.api.JavaTokenType;
import org.sonar.java.ast.parser.JavaGrammar;
import org.sonar.sslr.parser.LexerlessGrammar;


@Rule(
    key = "S1611",
    priority = Priority.MINOR,
    tags = {"java8"})
@BelongsToProfile(title = "Sonar way", priority = Priority.MINOR)
public class LambdaOptionalParenthesisCheck extends SquidCheck {
  @Override
  public void init() {
    subscribeTo(JavaGrammar.LAMBDA_PARAMETERS);
  }

  @Override
  public void visitNode(AstNode node) {
    if (!node.hasDirectChildren(JavaGrammar.FORMAL_PARAMETERS) && hasOneParameterWithParenthesis(node)) {
      String identifier = node.getFirstChild(JavaTokenType.IDENTIFIER).getTokenValue();
      getContext().createLineViolation(this, "Remove the parentheses around the \"" + identifier + "\" parameter", node);
    }
  }

  private boolean hasOneParameterWithParenthesis(AstNode node) {
    return node.getChildren(JavaTokenType.IDENTIFIER).size() == 1 && node.getFirstChild().is(JavaPunctuator.LPAR);
  }
}