org.sonar.javascript.checks.UnreachableCodeCheck Maven / Gradle / Ivy
/*
* SonarQube JavaScript Plugin
* Copyright (C) 2011 SonarSource and Eriks Nukis
* [email protected]
*
* This program 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 3 of the License, or (at your option) any later version.
*
* This program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
*/
package org.sonar.javascript.checks;
import com.sonar.sslr.api.AstNode;
import com.sonar.sslr.squid.checks.SquidCheck;
import org.sonar.check.BelongsToProfile;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.javascript.parser.EcmaScriptGrammar;
import org.sonar.sslr.parser.LexerlessGrammar;
@Rule(
key = "UnreachableCode",
priority = Priority.MAJOR)
@BelongsToProfile(title = CheckList.SONAR_WAY_PROFILE, priority = Priority.MAJOR)
public class UnreachableCodeCheck extends SquidCheck {
@Override
public void init() {
subscribeTo(
EcmaScriptGrammar.BREAK_STATEMENT,
EcmaScriptGrammar.RETURN_STATEMENT,
EcmaScriptGrammar.CONTINUE_STATEMENT,
EcmaScriptGrammar.THROW_STATEMENT);
}
@Override
public void visitNode(AstNode node) {
while (node.getParent().is(EcmaScriptGrammar.STATEMENT)
|| node.getParent().is(EcmaScriptGrammar.SOURCE_ELEMENT)) {
node = node.getParent();
}
AstNode nextStatement = node.getNextSibling();
if (isUnReachableCode(nextStatement)) {
getContext().createLineViolation(this, "This statement can't be reached and so start a dead code block.", nextStatement);
}
}
public static boolean isUnReachableCode(AstNode node) {
return node != null
&& !node.is(EcmaScriptGrammar.ELSE_CLAUSE)
&& !node.getFirstChild().is(EcmaScriptGrammar.FUNCTION_DECLARATION);
}
}