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/*******************************************************************************
* Copyright (c) 2008, 2017 Institute for Software, HSR Hochschule fuer Technik
* Rapperswil, University of applied sciences and others
*
* 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
*
* Contributors:
* Institute for Software - initial API and implementation
* Sergey Prigogin (Google)
*******************************************************************************/
package org.eclipse.cdt.internal.ui.refactoring.extractfunction;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTBinaryExpression;
import org.eclipse.cdt.core.dom.ast.IASTCompoundStatement;
import org.eclipse.cdt.core.dom.ast.IASTDeclSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTExpressionStatement;
import org.eclipse.cdt.core.dom.ast.IASTIdExpression;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTNode.CopyStyle;
import org.eclipse.cdt.core.dom.ast.IASTPointerOperator;
import org.eclipse.cdt.core.dom.ast.IBasicType.Kind;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.INodeFactory;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.ITypedef;
import org.eclipse.cdt.core.dom.ast.IVariable;
import org.eclipse.cdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.cdt.core.dom.rewrite.DeclarationGenerator;
import org.eclipse.cdt.core.parser.util.ArrayUtil;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTBinaryExpression;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTReturnStatement;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPBasicType;
import org.eclipse.cdt.internal.ui.refactoring.NameInformation;
import org.eclipse.text.edits.TextEditGroup;
/**
* Handles the extraction of expression nodes, for example, return type determination.
*
* @author Mirko Stocker
*/
public class ExpressionExtractor extends FunctionExtractor {
@Override
public boolean canChooseReturnValue() {
return false;
}
@Override
public void constructMethodBody(IASTCompoundStatement compound, List<IASTNode> nodes,
List<NameInformation> parameters, ASTRewrite rewrite, TextEditGroup group) {
CPPASTReturnStatement statement = new CPPASTReturnStatement();
statement.setReturnValue(getExpression(nodes));
ASTRewrite subRewrite = rewrite.insertBefore(compound, null, statement, group);
Map<IASTName, NameInformation> changedParameters = getChangedParameterReferences(parameters);
INodeFactory nodeFactory = nodes.get(0).getTranslationUnit().getASTNodeFactory();
adjustParameterReferences(statement, changedParameters, nodeFactory, subRewrite, group);
}
private IASTExpression getExpression(List<IASTNode> nodes) {
if (nodes.size() > 1) {
CPPASTBinaryExpression expression = new CPPASTBinaryExpression();
expression.setParent(nodes.get(0).getParent());
expression.setOperand1((IASTExpression) nodes.get(0).copy(CopyStyle.withLocations));
expression.setOperator(((IASTBinaryExpression) nodes.get(1).getParent()).getOperator());
expression.setOperand2(getExpression(nodes.subList(1, nodes.size())));
return expression;
} else {
return (IASTExpression) nodes.get(0).copy(CopyStyle.withLocations);
}
}
@Override
public IASTDeclSpecifier determineReturnType(IASTNode extractedNode, NameInformation nameInfo,
List<IASTPointerOperator> pointerOperators) {
IType returnType = determineReturnType(extractedNode);
INodeFactory factory = extractedNode.getTranslationUnit().getASTNodeFactory();
DeclarationGenerator generator = DeclarationGenerator.create(factory);
IASTDeclarator declarator = generator.createDeclaratorFromType(returnType, null);
ArrayUtil.addAll(pointerOperators, declarator.getPointerOperators());
return generator.createDeclSpecFromType(returnType);
}
private IType determineReturnType(IASTNode extractedNode) {
List<ITypedef> typedefs = getTypedefs(extractedNode);
if (extractedNode instanceof IASTExpression) {
IType expressionType = ((IASTExpression) extractedNode).getExpressionType();
for (ITypedef typedef : typedefs) {
if (typedef.getType().isSameType(expressionType)) {
return typedef;
}
}
return expressionType;
} else { // Fallback
return new CPPBasicType(Kind.eVoid, 0);
}
}
private List<ITypedef> getTypedefs(IASTNode extractedNode) {
final ArrayList<ITypedef> typeDefs = new ArrayList<>();
extractedNode.accept(new ASTVisitor() {
{
shouldVisitExpressions = true;
}
@Override
public int visit(IASTExpression expression) {
if (expression instanceof IASTIdExpression) {
IASTIdExpression id = (IASTIdExpression) expression;
IBinding binding = id.getName().resolveBinding();
IType expressionType = null;
if (binding instanceof IVariable) {
expressionType = ((IVariable) binding).getType();
}
if (binding instanceof IType) {
expressionType = (IType) binding;
}
if (expressionType != null && expressionType instanceof ITypedef) {
ITypedef typdef = (ITypedef) expressionType;
typeDefs.add(typdef);
}
}
return PROCESS_CONTINUE;
}
});
return typeDefs;
}
@Override
public IASTNode createReturnAssignment(IASTNode node, IASTExpressionStatement stmt, IASTExpression callExpression) {
return callExpression;
}
}
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