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/*
 * SonarQube Java
 * Copyright (C) 2012-2018 SonarSource SA
 * mailto:info 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.java.checks;

import org.sonar.check.Rule;
import org.sonar.plugins.java.api.JavaFileScanner;
import org.sonar.plugins.java.api.JavaFileScannerContext;
import org.sonar.plugins.java.api.tree.BaseTreeVisitor;
import org.sonar.plugins.java.api.tree.LiteralTree;
import org.sonar.plugins.java.api.tree.Tree;

@Rule(key = "S1314")
public class OctalValuesCheck extends BaseTreeVisitor implements JavaFileScanner {

  private JavaFileScannerContext context;

  @Override
  public void scanFile(final JavaFileScannerContext context) {
    this.context = context;
    scan(context.getTree());
  }

  @Override
  public void visitLiteral(LiteralTree tree) {
    if (tree.is(Tree.Kind.INT_LITERAL) && isOctal(tree.value())) {
      context.reportIssue(this, tree, "Use decimal values instead of octal ones.");
    }
  }

  private static boolean isOctal(String value) {
    return value.charAt(0) == '0'  && !"0".equals(value) && !isHexadecimal(value) && !isBinary(value);
  }

  private static boolean isHexadecimal(String value) {
    return value.startsWith("0x") || value.startsWith("0X");
  }

  private static boolean isBinary(String value) {
    return value.startsWith("0b") || value.startsWith("0B");
  }

}