com.liferay.source.formatter.check.JavaElseStatementCheck 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.check;
import com.liferay.petra.string.CharPool;
import com.liferay.petra.string.StringBundler;
import com.liferay.petra.string.StringPool;
import com.liferay.portal.kernel.util.ListUtil;
import com.liferay.portal.kernel.util.StringUtil;
import com.liferay.portal.tools.ToolsUtil;
import com.liferay.source.formatter.parser.JavaTerm;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author Hugo Huijser
*/
public class JavaElseStatementCheck extends BaseJavaTermCheck {
@Override
protected String doProcess(
String fileName, String absolutePath, JavaTerm javaTerm,
String fileContent) {
String javaTermContent = javaTerm.getContent();
Matcher matcher1 = _elseStatementPattern.matcher(javaTermContent);
outerLoop:
while (matcher1.find()) {
List ifStatementCodeBlocks = _getIfStatementCodeBlock(
javaTermContent, matcher1.start());
if (ListUtil.isEmpty(ifStatementCodeBlocks)) {
continue;
}
String exitStatementType = null;
for (String ifStatementCodeBlock : ifStatementCodeBlocks) {
exitStatementType = null;
Matcher matcher2 = _exitStatementPattern.matcher(
ifStatementCodeBlock);
while (matcher2.find()) {
if (ToolsUtil.isInsideQuotes(
ifStatementCodeBlock, matcher2.start())) {
continue;
}
String s = ifStatementCodeBlock.substring(
0, matcher2.start());
if (getLevel(s, "{", "}") == 1) {
exitStatementType = matcher2.group(1);
break;
}
}
if (exitStatementType == null) {
continue outerLoop;
}
}
if (exitStatementType == null) {
continue;
}
int closeCurlyBracePos = _getCloseCurlyBracePos(
javaTermContent, matcher1.start() + 2);
String endLine = getLine(
javaTermContent,
getLineNumber(javaTermContent, closeCurlyBracePos));
if (Objects.equals(StringUtil.trim(endLine), "}")) {
String elseStatement = javaTermContent.substring(
matcher1.start() + 2, closeCurlyBracePos + 1);
if (!_containsVariableName(
javaTermContent.substring(closeCurlyBracePos),
getVariableNames(elseStatement))) {
int x = elseStatement.indexOf(CharPool.NEW_LINE);
int y = elseStatement.lastIndexOf(CharPool.NEW_LINE);
String replacement = StringPool.BLANK;
if (x != y) {
replacement = StringUtil.replace(
elseStatement.substring(x, y), "\n\t", "\n");
}
return StringUtil.replaceFirst(
javaTermContent, elseStatement, replacement,
matcher1.start());
}
}
int x = javaTermContent.lastIndexOf(
exitStatementType, matcher1.start());
addMessage(
fileName,
StringBundler.concat(
"Else statement is not needed because of the \"",
exitStatementType, "\" statement on line ",
javaTerm.getLineNumber(x)),
javaTerm.getLineNumber(matcher1.start() + 3));
}
return javaTermContent;
}
@Override
protected String[] getCheckableJavaTermNames() {
return new String[] {JAVA_CONSTRUCTOR, JAVA_METHOD};
}
private boolean _containsVariableName(
String s, List variableNames) {
for (String variableName : variableNames) {
if (s.matches("(?s).*\\W" + variableName + "\\W.*")) {
return true;
}
}
return false;
}
private int _getCloseCurlyBracePos(String content, int x) {
int y = x;
while (true) {
y = content.indexOf("}", y + 1);
if (y == -1) {
return -1;
}
if (getLevel(content.substring(x, y + 1), "{", "}") == 0) {
return y;
}
}
}
private List _getElseIfStatementCodeBlock(
String content, int closeCurlyBracePos, int x) {
int openCurlyBracePos = content.indexOf(
StringPool.OPEN_CURLY_BRACE, closeCurlyBracePos + 1);
if (openCurlyBracePos == -1) {
return Collections.emptyList();
}
String statement = StringUtil.trim(
content.substring(closeCurlyBracePos + 1, openCurlyBracePos));
if (!statement.startsWith("else if")) {
return Collections.emptyList();
}
closeCurlyBracePos = _getCloseCurlyBracePos(content, openCurlyBracePos);
if (closeCurlyBracePos == -1) {
return Collections.emptyList();
}
List elseIfStatementCodeBlocks = new ArrayList<>();
elseIfStatementCodeBlocks.add(
content.substring(openCurlyBracePos, closeCurlyBracePos + 1));
if (closeCurlyBracePos == x) {
return elseIfStatementCodeBlocks;
}
List nestedElseIfStatementCodeBlocks =
_getElseIfStatementCodeBlock(content, closeCurlyBracePos, x);
if (nestedElseIfStatementCodeBlocks.isEmpty()) {
return Collections.emptyList();
}
elseIfStatementCodeBlocks.addAll(nestedElseIfStatementCodeBlocks);
return elseIfStatementCodeBlocks;
}
private List _getIfStatementCodeBlock(String content, int x) {
Matcher matcher = _ifStatementPattern.matcher(content);
while (matcher.find()) {
int closeCurlyBracePos = _getCloseCurlyBracePos(
content, matcher.start());
if (ToolsUtil.isInsideQuotes(content, matcher.start()) ||
(closeCurlyBracePos > x)) {
continue;
}
String s = StringUtil.trim(content.substring(0, matcher.start()));
if (s.endsWith("else")) {
continue;
}
List ifStatementCodeBlocks = new ArrayList<>();
ifStatementCodeBlocks.add(
content.substring(matcher.start(), closeCurlyBracePos + 1));
if (closeCurlyBracePos != x) {
List elseIfStatementCodeBlocks =
_getElseIfStatementCodeBlock(
content, closeCurlyBracePos, x);
if (elseIfStatementCodeBlocks.isEmpty()) {
continue;
}
ifStatementCodeBlocks.addAll(elseIfStatementCodeBlocks);
}
return ifStatementCodeBlocks;
}
return null;
}
private static final Pattern _elseStatementPattern = Pattern.compile(
"\\}\n\t*else \\{\n");
private static final Pattern _exitStatementPattern = Pattern.compile(
"\\s(break|continue|return|throw)[\\s;]");
private static final Pattern _ifStatementPattern = Pattern.compile(
"\\sif\\s*\\(");
}
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