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Checkstyle is a development tool to help programmers write Java code
that adheres to a coding standard
////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2021 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.whitespace;
import com.puppycrawl.tools.checkstyle.StatelessCheck;
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.CommonUtil;
/**
*
* Checks that a token is followed by whitespace, with the exception that it
* does not check for whitespace after the semicolon of an empty for iterator.
* Use Check
* EmptyForIteratorPad to validate empty for iterators.
*
*
* -
* Property {@code tokens} - tokens to check
* Type is {@code java.lang.String[]}.
* Validation type is {@code tokenSet}.
* Default value is:
*
* COMMA,
*
* SEMI,
*
* TYPECAST,
*
* LITERAL_IF,
*
* LITERAL_ELSE,
*
* LITERAL_WHILE,
*
* LITERAL_DO,
*
* LITERAL_FOR,
*
* DO_WHILE.
*
*
*
* To configure the check:
*
*
* <module name="WhitespaceAfter"/>
*
* Example:
*
* public void myTest() {
* if (foo) { // OK
* //...
* } else if(bar) { // violation
* //...
* }
*
* testMethod(foo, bar); // OK
* testMethod(foo,bar); // violation
*
* for (;;){} // OK
* for(;;){} // violation, space after 'for' is required
* }
*
*
* To configure the check for whitespace only after COMMA and SEMI tokens:
*
*
* <module name="WhitespaceAfter">
* <property name="tokens" value="COMMA, SEMI"/>
* </module>
*
* Example:
*
* public void myTest() {
* int a; int b; // OK
* int a;int b; // violation
*
* testMethod(foo, bar); // OK
* testMethod(foo,bar); // violation
*
* for(;;) {} // OK
* }
*
*
* Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker}
*
*
* Violation Message Keys:
*
*
* -
* {@code ws.notFollowed}
*
* -
* {@code ws.typeCast}
*
*
*
* @since 3.0
*/
@StatelessCheck
public class WhitespaceAfterCheck
extends AbstractCheck {
/**
* A key is pointing to the warning message text in "messages.properties"
* file.
*/
public static final String MSG_WS_NOT_FOLLOWED = "ws.notFollowed";
/**
* A key is pointing to the warning message text in "messages.properties"
* file.
*/
public static final String MSG_WS_TYPECAST = "ws.typeCast";
@Override
public int[] getDefaultTokens() {
return getAcceptableTokens();
}
@Override
public int[] getAcceptableTokens() {
return new int[] {
TokenTypes.COMMA,
TokenTypes.SEMI,
TokenTypes.TYPECAST,
TokenTypes.LITERAL_IF,
TokenTypes.LITERAL_ELSE,
TokenTypes.LITERAL_WHILE,
TokenTypes.LITERAL_DO,
TokenTypes.LITERAL_FOR,
TokenTypes.DO_WHILE,
};
}
@Override
public int[] getRequiredTokens() {
return CommonUtil.EMPTY_INT_ARRAY;
}
@Override
public void visitToken(DetailAST ast) {
if (ast.getType() == TokenTypes.TYPECAST) {
final DetailAST targetAST = ast.findFirstToken(TokenTypes.RPAREN);
final String line = getLine(targetAST.getLineNo() - 1);
if (!isFollowedByWhitespace(targetAST, line)) {
log(targetAST, MSG_WS_TYPECAST);
}
}
else {
final String line = getLine(ast.getLineNo() - 1);
if (!isFollowedByWhitespace(ast, line)) {
final Object[] message = {ast.getText()};
log(ast, MSG_WS_NOT_FOLLOWED, message);
}
}
}
/**
* Checks whether token is followed by a whitespace.
*
* @param targetAST Ast token.
* @param line The line associated with the ast token.
* @return true if ast token is followed by a whitespace.
*/
private static boolean isFollowedByWhitespace(DetailAST targetAST, String line) {
final int after =
targetAST.getColumnNo() + targetAST.getText().length();
boolean followedByWhitespace = true;
if (after < line.codePointCount(0, line.length())) {
final int[] codePoints = line.codePoints().toArray();
final int codePoint = codePoints[after];
followedByWhitespace = codePoint == ';'
|| codePoint == ')'
|| Character.isWhitespace(codePoint);
}
return followedByWhitespace;
}
}