////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2017 the original author or authors.
//
// This library 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 2.1 of the License, or (at your option) any later version.
//
// This library 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 library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
////////////////////////////////////////////////////////////////////////////////
package com.puppycrawl.tools.checkstyle.checks.coding;
import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
import com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;
import com.puppycrawl.tools.checkstyle.utils.CommonUtils;
import com.puppycrawl.tools.checkstyle.utils.JavadocUtils;
import com.puppycrawl.tools.checkstyle.utils.TokenUtils;
/**
* <p>
* Checks for illegal tokens. By default labels are prohibited.
* </p>
* <p>
* Rationale: Certain language features can harm readability, lead to
* confusion or are not obvious to novice developers. Other features
* may be discouraged in certain frameworks, such as not having
* native methods in EJB components.
* </p>
* <p>
* An example of how to configure the check is:
* </p>
* <pre>
* <module name="IllegalToken"/>
* </pre>
* <p> An example of how to configure the check to forbid
* a {@link TokenTypes#LITERAL_NATIVE LITERAL_NATIVE} token is:
* </p>
* <pre>
* <module name="IllegalToken">
* <property name="tokens" value="LITERAL_NATIVE"/>
* </module>
* </pre>
* @author <a href="mailto:simon@redhillconsulting.com.au">Simon Harris</a>
* @author Rick Giles
*/
public class IllegalTokenCheck
extends AbstractCheck {
/**
* A key is pointing to the warning message text in "messages.properties"
* file.
*/
public static final String MSG_KEY = "illegal.token";
@Override
public int[] getDefaultTokens() {
return new int[] {
TokenTypes.LABELED_STAT,
};
}
@Override
public int[] getAcceptableTokens() {
return TokenUtils.getAllTokenIds();
}
@Override
public int[] getRequiredTokens() {
return CommonUtils.EMPTY_INT_ARRAY;
}
@Override
public boolean isCommentNodesRequired() {
return true;
}
@Override
public void visitToken(DetailAST ast) {
log(
ast.getLineNo(),
ast.getColumnNo(),
MSG_KEY,
convertToString(ast)
);
}
/**
* Converts given AST node to string representation.
* @param ast node to be represented as string
* @return string representation of AST node
*/
private static String convertToString(DetailAST ast) {
final String tokenText;
switch (ast.getType()) {
case TokenTypes.LABELED_STAT:
tokenText = ast.getFirstChild().getText() + ast.getText();
break;
// multiline tokens need to become singlelined
case TokenTypes.COMMENT_CONTENT:
tokenText = JavadocUtils.escapeAllControlChars(ast.getText());
break;
default:
tokenText = ast.getText();
break;
}
return tokenText;
}
}