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/*******************************************************************************
* Copyright (c) 2008, 2010 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Markus Schorn - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTArraySubscriptExpression;
import org.eclipse.cdt.core.dom.ast.IASTCastExpression;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTExpressionList;
import org.eclipse.cdt.core.dom.ast.IASTFieldReference;
import org.eclipse.cdt.core.dom.ast.IASTFunctionCallExpression;
import org.eclipse.cdt.core.dom.ast.IASTInitializerClause;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTUnaryExpression;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IProblemBinding;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.core.runtime.Assert;
/**
* Handles the ambiguity between cast and function-call expressions: (type)(expr) versus (function)(expr);
* It also handles the impact on the grouping of the sub-expressions.
*/
public abstract class ASTAmbiguousCastVsFunctionCallExpression extends ASTAmbiguousNode implements IASTAmbiguousExpression {
private final IASTCastExpression fCastExpression;
private final IASTFunctionCallExpression fFunctionCallExpression;
/**
* The operand of the cast expression must start with an expression in parenthesis (which could be read as the parameter
* list of the function call).
* The function-call must contain the name expression (corresponding to the type-id of the cast expression). The parameter
* expression may be <code>null</code>, it will be computed from the cast expression.
*/
public ASTAmbiguousCastVsFunctionCallExpression(IASTCastExpression castExpression, IASTFunctionCallExpression functionCall) {
fCastExpression= castExpression;
fFunctionCallExpression= functionCall;
}
@Override
public final IASTNode[] getNodes() {
return getExpressions();
}
public final IASTExpression copy() {
throw new UnsupportedOperationException();
}
public void addExpression(IASTExpression e) {
Assert.isLegal(false);
}
public IType getExpressionType() {
return fCastExpression.getExpressionType();
}
public IASTExpression[] getExpressions() {
return new IASTExpression[] {fCastExpression, fFunctionCallExpression};
}
@Override
public final IASTNode resolveAmbiguity(ASTVisitor visitor) {
final IASTAmbiguityParent owner= (IASTAmbiguityParent) getParent();
IASTNode nodeToReplace= this;
// try cast-expression
owner.replace(nodeToReplace, fCastExpression);
nodeToReplace= fCastExpression;
// resolve nested ambiguities
fCastExpression.accept(visitor);
// if the operand of the cast-expr is not suitable for a function call, we are done.
final IASTUnaryExpression primaryWithParenthesis= findPrimaryExpressionInParenthesis(fCastExpression.getOperand());
if (primaryWithParenthesis == null)
return nodeToReplace;
// find nested names
final NameCollector nameCollector= new NameCollector();
fCastExpression.getTypeId().accept(nameCollector);
final IASTName[] names= nameCollector.getNames();
// resolve names
boolean hasIssue= false;
for (IASTName name : names) {
try {
IBinding b = name.resolveBinding();
if (b instanceof IProblemBinding) {
hasIssue= true;
break;
}
} catch (Exception t) {
hasIssue= true;
break;
}
}
if (!hasIssue)
return nodeToReplace;
final IASTExpression operand = primaryWithParenthesis.getOperand();
if (operand instanceof IASTExpressionList) {
final IASTExpressionList list= (IASTExpressionList) operand;
fFunctionCallExpression.setArguments(list.getExpressions());
} else if (operand != null) {
fFunctionCallExpression.setArguments(new IASTInitializerClause[] {operand});
} else {
fFunctionCallExpression.setArguments(IASTExpression.EMPTY_EXPRESSION_ARRAY);
}
setRange(fFunctionCallExpression, fCastExpression, primaryWithParenthesis);
IASTExpression result= fFunctionCallExpression;
IASTExpression postFix= fCastExpression.getOperand();
if (postFix != primaryWithParenthesis) {
result= postFix;
while (true) {
setStart(postFix, fFunctionCallExpression);
if (postFix instanceof IASTArraySubscriptExpression) {
final IASTArraySubscriptExpression ase = (IASTArraySubscriptExpression) postFix;
postFix= ase.getArrayExpression();
if (postFix == primaryWithParenthesis) {
ase.setArrayExpression(fFunctionCallExpression);
break;
}
} else if (postFix instanceof IASTFunctionCallExpression) {
final IASTFunctionCallExpression fc = (IASTFunctionCallExpression) postFix;
postFix= fc.getFunctionNameExpression();
if (postFix == primaryWithParenthesis) {
fc.setFunctionNameExpression(fFunctionCallExpression);
break;
}
} else if (postFix instanceof IASTFieldReference) {
final IASTFieldReference fr = (IASTFieldReference) postFix;
postFix= fr.getFieldOwner();
if (postFix == primaryWithParenthesis) {
fr.setFieldOwner(fFunctionCallExpression);
break;
}
} else {
final IASTUnaryExpression ue = (IASTUnaryExpression) postFix;
postFix= ue.getOperand();
if (postFix == primaryWithParenthesis) {
ue.setOperand(fFunctionCallExpression);
break;
}
}
}
}
owner.replace(nodeToReplace, result);
// resolve ambiguities in the function-call expression
fFunctionCallExpression.getFunctionNameExpression().accept(visitor);
return result;
}
private IASTUnaryExpression findPrimaryExpressionInParenthesis(IASTExpression operand) {
while (true) {
if (operand instanceof IASTUnaryExpression) {
final IASTUnaryExpression unary= (IASTUnaryExpression) operand;
switch (unary.getOperator()) {
case IASTUnaryExpression.op_bracketedPrimary:
return unary;
case IASTUnaryExpression.op_postFixDecr:
case IASTUnaryExpression.op_postFixIncr:
operand= unary.getOperand();
break;
default:
return null;
}
}
else if (operand instanceof IASTArraySubscriptExpression) {
operand= ((IASTArraySubscriptExpression) operand).getArrayExpression();
} else if (operand instanceof IASTFunctionCallExpression) {
operand= ((IASTFunctionCallExpression) operand).getFunctionNameExpression();
} else if (operand instanceof IASTFieldReference) {
operand= ((IASTFieldReference) operand).getFieldOwner();
} else {
return null;
}
}
}
private void setStart(IASTNode node, IASTNode start) {
final ASTNode target= (ASTNode) node;
final int offset = ((ASTNode) start).getOffset();
target.setOffsetAndLength(offset, target.getOffset() + target.getLength() - offset);
}
private void setRange(IASTNode node, IASTNode from, IASTNode to) {
final int offset = ((ASTNode) from).getOffset();
final ASTNode t= (ASTNode) to;
((ASTNode) node).setOffsetAndLength(offset, t.getOffset()+t.getLength()-offset);
}
}
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