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/*******************************************************************************
* Copyright (c) 2019 Marco Stornelli
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
*******************************************************************************/
package org.eclipse.cdt.codan.internal.checkers.ui.quickfix;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.eclipse.cdt.codan.internal.checkers.ui.CheckersUiActivator;
import org.eclipse.cdt.codan.ui.AbstractAstRewriteQuickFix;
import org.eclipse.cdt.core.dom.ast.IASTBreakStatement;
import org.eclipse.cdt.core.dom.ast.IASTCaseStatement;
import org.eclipse.cdt.core.dom.ast.IASTCompoundStatement;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTIdExpression;
import org.eclipse.cdt.core.dom.ast.IASTLiteralExpression;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTStatement;
import org.eclipse.cdt.core.dom.ast.IASTSwitchStatement;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IEnumeration;
import org.eclipse.cdt.core.dom.ast.IEnumerator;
import org.eclipse.cdt.core.dom.ast.INodeFactory;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPEnumeration;
import org.eclipse.cdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.cdt.core.index.IIndex;
import org.eclipse.cdt.core.model.ITranslationUnit;
import org.eclipse.cdt.internal.core.dom.parser.ValueFactory;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.ltk.core.refactoring.Change;
@SuppressWarnings("restriction")
public class QuickFixAddCaseSwitch extends AbstractAstRewriteQuickFix {
@Override
public String getLabel() {
return QuickFixMessages.QuickFixAddCaseSwitch_add_cases_to_switch;
}
@Override
public void modifyAST(IIndex index, IMarker marker) {
IASTTranslationUnit ast;
try {
ITranslationUnit tu = getTranslationUnitViaEditor(marker);
ast = tu.getAST(index, ITranslationUnit.AST_SKIP_INDEXED_HEADERS);
} catch (CoreException e) {
CheckersUiActivator.log(e);
return;
}
IASTNode astNode = null;
if (isCodanProblem(marker)) {
astNode = getASTNodeFromMarker(marker, ast);
}
if (astNode == null || !(astNode instanceof IASTSwitchStatement)) {
return;
}
ASTRewrite r = ASTRewrite.create(ast);
INodeFactory factory = ast.getASTNodeFactory();
Map<String, Number> missingEnums = getMissingCases((IASTSwitchStatement) astNode);
Set<Number> existing = new HashSet<>();
missingEnums = missingEnums.entrySet().stream().filter(entry -> existing.add(entry.getValue()))
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
List<IASTCaseStatement> caseStatements = new ArrayList<>();
for (Map.Entry<String, Number> e : missingEnums.entrySet()) {
IASTName newName = factory.newName(e.getKey());
caseStatements.add(factory.newCaseStatement(factory.newIdExpression(newName)));
}
IASTBreakStatement breakStatement = factory.newBreakStatement();
IASTNode[] children = astNode.getChildren();
IASTCompoundStatement compound = null;
for (int i = 0; i < children.length; ++i) {
if (children[i] instanceof IASTCompoundStatement) {
compound = (IASTCompoundStatement) children[i];
break;
}
}
if (compound == null)
return;
for (IASTCaseStatement caseStatement : caseStatements)
r.insertBefore(compound, null, caseStatement, null);
r.insertBefore(compound, null, breakStatement, null);
Change c = r.rewriteAST();
try {
c.perform(new NullProgressMonitor());
} catch (CoreException e) {
CheckersUiActivator.log(e);
return;
}
try {
marker.delete();
} catch (CoreException e) {
CheckersUiActivator.log(e);
}
}
private Map<String, Number> getMissingCases(IASTSwitchStatement statement) {
IASTExpression controller = statement.getControllerExpression();
IASTStatement bodyStmt = statement.getBody();
IType type = SemanticUtil.getUltimateType(controller.getExpressionType(), true);
Map<String, Number> enumValues = new HashMap<>();
if (type instanceof IEnumeration) {
IEnumerator[] enums = ((IEnumeration) type).getEnumerators();
String prefix = "";
if (type instanceof ICPPEnumeration) {
String[] qualName = CPPVisitor.getQualifiedName((IEnumeration) type);
StringBuilder builder = new StringBuilder();
for (int i = 0; i < qualName.length - 1; ++i) {
builder.append(qualName[i]);
builder.append("::");
}
prefix = builder.toString();
}
for (IEnumerator e : enums) {
enumValues.put(prefix + e.getName(), e.getValue().numberValue());
}
} else
return enumValues;
final List<IASTStatement> statements;
if (bodyStmt instanceof IASTCompoundStatement) {
statements = Arrays.asList(((IASTCompoundStatement) bodyStmt).getStatements());
} else {
statements = Collections.singletonList(bodyStmt);
}
for (IASTStatement s : statements) {
if (s instanceof IASTCaseStatement && ((IASTCaseStatement) s).getExpression() instanceof IASTIdExpression) {
IASTName name = ((IASTIdExpression) ((IASTCaseStatement) s).getExpression()).getName();
IBinding binding = name.resolveBinding();
if (binding instanceof IEnumerator) {
enumValues.entrySet().removeIf(
entry -> entry.getValue().equals(((IEnumerator) binding).getValue().numberValue()));
}
} else if (s instanceof IASTCaseStatement
&& ((IASTCaseStatement) s).getExpression() instanceof IASTLiteralExpression) {
Number value = ValueFactory.getConstantNumericalValue(((IASTCaseStatement) s).getExpression());
if (value != null)
enumValues.entrySet().removeIf(entry -> entry.getValue().equals(value));
}
}
return enumValues;
}
}
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