org.sonar.plugins.html.checks.accessibility.NoNoninteractiveTabIndexCheck Maven / Gradle / Ivy

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/*
 * SonarQube HTML
 * Copyright (C) 2010-2024 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 Sonar Source-Available License Version 1, as published by SonarSource SA.
 *
 * 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 Sonar Source-Available License for more details.
 *
 * You should have received a copy of the Sonar Source-Available License
 * along with this program; if not, see https://sonarsource.com/license/ssal/
 */
package org.sonar.plugins.html.checks.accessibility;

import static org.sonar.plugins.html.api.HtmlConstants.hasInteractiveRole;
import static org.sonar.plugins.html.api.HtmlConstants.hasKnownHTMLTag;
import static org.sonar.plugins.html.api.HtmlConstants.isInteractiveElement;

import org.sonar.check.Rule;
import org.sonar.plugins.html.checks.AbstractPageCheck;
import org.sonar.plugins.html.node.TagNode;

@Rule(key = "S6845")
public class NoNoninteractiveTabIndexCheck extends AbstractPageCheck {

  private static final String MESSAGE = "\"tabIndex\" should only be declared on interactive elements.";

  @Override
  public void startElement(TagNode node) {
    if (!hasKnownHTMLTag(node) || isInteractiveElement(node) || hasInteractiveRole(node)) {
      return;
    }

    var tabIndex = node.getAttribute("tabindex");
    if (tabIndex == null) {
      return;
    }

    try {
      var tabIndexValue = Integer.parseInt(tabIndex);
      if (tabIndexValue >= 0) {
        createViolation(node, MESSAGE);
      }
    } catch (NumberFormatException e) {
      // ignore
    }
  }
}