org.sonar.plugins.web.checks.whitespace.WhiteSpaceAroundCheck Maven / Gradle / Ivy

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Enables scanning of HTML, and JSP/JSF files.
There is a newer version: 2.6.0.1053
/*
 * SonarSource :: Web :: Sonar Plugin
 * Copyright (c) 2010-2016 SonarSource SA and Matthijs Galesloot
 * [email protected]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sonar.plugins.web.checks.whitespace;

import org.sonar.check.Rule;
import org.sonar.plugins.web.checks.AbstractPageCheck;
import org.sonar.plugins.web.node.CommentNode;
import org.sonar.plugins.web.node.DirectiveNode;
import org.sonar.plugins.web.node.ExpressionNode;
import org.sonar.plugins.web.node.Node;

/**
 * @author Matthijs Galesloot
 * @since 1.0
 */
@Rule(key = "WhiteSpaceAroundCheck")
public class WhiteSpaceAroundCheck extends AbstractPageCheck {

  private void checkEndWhitespace(Node node, String code, String end) {

    int position = end.length();
    if (code.endsWith(end) && code.length() > position) {
      char ch = code.charAt(code.length() - position - 1);

      if (!Character.isWhitespace(ch)) {
        createViolation(node.getStartLinePosition(), "Add a space at column " + (node.getEndColumnPosition() - position) + ".");
      }
    }
  }

  private void checkStartWhitespace(Node node, String code, String start) {

    int position = start.length();
    if (code.startsWith(start) && code.length() > position) {
      char ch = code.charAt(position);
      switch (ch) {
        case '!':
        case '=':
          handleEqualSign(node, code, position);
          break;
        default:
          if (!Character.isWhitespace(ch)) {
            createStartIssue(node.getStartLinePosition(), node.getStartColumnPosition() + position);
          }
          break;
      }
    }
  }

  private void handleEqualSign(Node node, String code, int position) {
    int tmpPosition = position + 1;
    if (code.length() > tmpPosition && !Character.isWhitespace(code.charAt(tmpPosition))) {
      createStartIssue(node.getStartLinePosition(), node.getStartColumnPosition() + tmpPosition);
    }
  }

  private void createStartIssue(int line, int expectedWhitespaceColumn) {
    createViolation(line, "A whitespace is missing after the starting tag at column " + expectedWhitespaceColumn + ".");
  }

  @Override
  public void comment(CommentNode node) {

    if (node.isHtml()) {
      checkStartWhitespace(node, node.getCode(), "");
    } else {
      checkStartWhitespace(node, node.getCode(), "<%--");
      checkEndWhitespace(node, node.getCode(), "--%>");
    }
  }

  @Override
  public void directive(DirectiveNode node) {
    if (node.isJsp()) {
      checkStartWhitespace(node, node.getCode(), "<%@");
      checkEndWhitespace(node, node.getCode(), "%>");
    }
  }

  @Override
  public void expression(ExpressionNode node) {
    checkStartWhitespace(node, node.getCode(), "<%");
    checkEndWhitespace(node, node.getCode(), "%>");
  }
}