com.liferay.source.formatter.checkstyle.check.LambdaCheck Maven / Gradle / Ivy
/**
* SPDX-FileCopyrightText: (c) 2000 Liferay, Inc. https://liferay.com
* SPDX-License-Identifier: LGPL-2.1-or-later OR LicenseRef-Liferay-DXP-EULA-2.0.0-2023-06
*/
package com.liferay.source.formatter.checkstyle.check;
import com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;
/**
* @author Hugo Huijser
*/
public class LambdaCheck extends BaseCheck {
@Override
public int[] getDefaultTokens() {
return new int[] {TokenTypes.LAMBDA};
}
@Override
protected void doVisitToken(DetailAST detailAST) {
DetailAST lastChildDetailAST = detailAST.getLastChild();
if (lastChildDetailAST.getType() != TokenTypes.SLIST) {
DetailAST parametersDetailAST = detailAST.findFirstToken(
TokenTypes.PARAMETERS);
if ((parametersDetailAST == null) ||
(parametersDetailAST.getChildCount() != 0)) {
return;
}
DetailAST exprDetailAST = detailAST.findFirstToken(TokenTypes.EXPR);
if ((exprDetailAST == null) ||
(exprDetailAST.getLineNo() != detailAST.getLineNo())) {
return;
}
DetailAST firstChildDetailAST = exprDetailAST.getFirstChild();
if ((firstChildDetailAST != null) &&
(firstChildDetailAST.getType() != TokenTypes.METHOD_CALL)) {
return;
}
DetailAST parameterDetailAST = getParameterDetailAST(
firstChildDetailAST);
if (parameterDetailAST != null) {
return;
}
firstChildDetailAST = firstChildDetailAST.getFirstChild();
if ((firstChildDetailAST.getType() != TokenTypes.DOT) ||
(firstChildDetailAST.getChildCount(TokenTypes.IDENT) != 2)) {
return;
}
DetailAST nextSiblingDetailAST =
firstChildDetailAST.getNextSibling();
if ((nextSiblingDetailAST.getType() != TokenTypes.ELIST) ||
nextSiblingDetailAST.hasChildren()) {
return;
}
log(detailAST, _MSG_SIMPLIFY_LAMBDA_2);
return;
}
DetailAST firstChildDetailAST = lastChildDetailAST.getFirstChild();
if (lastChildDetailAST.getChildCount() == 2) {
if (firstChildDetailAST.getType() == TokenTypes.LITERAL_RETURN) {
log(detailAST, _MSG_SIMPLIFY_LAMBDA_1);
}
return;
}
if ((lastChildDetailAST.getChildCount() != 3) ||
(firstChildDetailAST.getType() != TokenTypes.EXPR)) {
return;
}
DetailAST nextSiblingDetailAST = firstChildDetailAST.getNextSibling();
if (nextSiblingDetailAST.getType() == TokenTypes.SEMI) {
log(detailAST, _MSG_SIMPLIFY_LAMBDA_1);
}
}
private static final String _MSG_SIMPLIFY_LAMBDA_1 = "lambda.simplify.1";
private static final String _MSG_SIMPLIFY_LAMBDA_2 = "lambda.simplify.2";
}