org.sonar.python.checks.AbstractUnreadPrivateMembersCheck Maven / Gradle / Ivy
/*
* SonarQube Python Plugin
* Copyright (C) 2011-2024 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the Sonar Source-Available License Version 1, as published by SonarSource SA.
*
* 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 Sonar Source-Available License for more details.
*
* You should have received a copy of the Sonar Source-Available License
* along with this program; if not, see https://sonarsource.com/license/ssal/
*/
package org.sonar.python.checks;
import java.util.Collection;
import java.util.Optional;
import java.util.function.Predicate;
import org.sonar.plugins.python.api.PythonSubscriptionCheck;
import org.sonar.plugins.python.api.SubscriptionContext;
import org.sonar.plugins.python.api.symbols.AmbiguousSymbol;
import org.sonar.plugins.python.api.symbols.ClassSymbol;
import org.sonar.plugins.python.api.symbols.Symbol;
import org.sonar.plugins.python.api.symbols.Usage;
import org.sonar.plugins.python.api.tree.ClassDef;
import org.sonar.python.tree.TreeUtils;
import static org.sonar.plugins.python.api.tree.Tree.Kind.CLASSDEF;
public abstract class AbstractUnreadPrivateMembersCheck extends PythonSubscriptionCheck {
@Override
public void initialize(Context context) {
String memberPrefix = memberPrefix();
context.registerSyntaxNodeConsumer(CLASSDEF, ctx -> {
ClassDef classDef = (ClassDef) ctx.syntaxNode();
if (!classDef.decorators().isEmpty()) {
// avoid checking for classes with decorators since it is impossible to analyze its final behavior
return;
}
Optional.ofNullable(TreeUtils.getClassSymbolFromDef(classDef))
.map(ClassSymbol::declaredMembers)
.stream()
.flatMap(Collection::stream)
.filter(s -> s.name().startsWith(memberPrefix) && !s.name().endsWith("__") && equalsToKind(s) && isNeverRead(s))
.filter(Predicate.not(this::isException))
.filter(s -> !hasAmbiguousUsage(s, classDef))
.forEach(symbol -> reportIssue(ctx, symbol));
});
}
protected boolean isException(Symbol symbol) {
return false;
}
protected boolean hasAmbiguousUsage(Symbol symbol, ClassDef classDef) {
return false;
}
private boolean equalsToKind(Symbol symbol) {
if (symbol.kind().equals(Symbol.Kind.AMBIGUOUS)) {
return ((AmbiguousSymbol) symbol).alternatives().stream().allMatch(s -> s.kind() == kind());
}
return symbol.kind() == kind();
}
private void reportIssue(SubscriptionContext ctx, Symbol symbol) {
PreciseIssue preciseIssue = null;
for (int i = 0; i < symbol.usages().size(); i++) {
Usage usage = symbol.usages().get(i);
if (i == 0) {
preciseIssue = ctx.addIssue(usage.tree(), message(symbol.name()));
} else {
preciseIssue.secondary(usage.tree(), secondaryMessage());
}
}
}
private static boolean isNeverRead(Symbol symbol) {
return symbol.usages().stream().allMatch(Usage::isBindingUsage);
}
abstract String memberPrefix();
abstract Symbol.Kind kind();
abstract String message(String memberName);
abstract String secondaryMessage();
}
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