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/*******************************************************************************
* Copyright (c) 2004, 2012 IBM Corporation 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:
* John Camelon (IBM) - Initial API and implementation
* Markus Schorn (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp;
import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.LVALUE;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTConditionalExpression;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IASTUnaryExpression;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTExpression;
import org.eclipse.cdt.internal.core.dom.parser.ASTNode;
import org.eclipse.cdt.internal.core.dom.parser.IASTAmbiguityParent;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalConditional;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalFixed;
public class CPPASTConditionalExpression extends ASTNode implements IASTConditionalExpression,
ICPPASTExpression, IASTAmbiguityParent {
private ICPPASTExpression fCondition;
private ICPPASTExpression fPositive;
private ICPPASTExpression fNegative;
private ICPPEvaluation fEval;
public CPPASTConditionalExpression() {
}
public CPPASTConditionalExpression(IASTExpression condition, IASTExpression postive, IASTExpression negative) {
setLogicalConditionExpression(condition);
setPositiveResultExpression(postive);
setNegativeResultExpression(negative);
}
@Override
public CPPASTConditionalExpression copy() {
return copy(CopyStyle.withoutLocations);
}
@Override
public CPPASTConditionalExpression copy(CopyStyle style) {
CPPASTConditionalExpression copy = new CPPASTConditionalExpression();
copy.setLogicalConditionExpression(fCondition == null ? null : fCondition.copy(style));
copy.setPositiveResultExpression(fPositive == null ? null : fPositive.copy(style));
copy.setNegativeResultExpression(fNegative == null ? null : fNegative.copy(style));
copy.setOffsetAndLength(this);
if (style == CopyStyle.withLocations) {
copy.setCopyLocation(this);
}
return copy;
}
@Override
public IASTExpression getLogicalConditionExpression() {
return fCondition;
}
@Override
public void setLogicalConditionExpression(IASTExpression expression) {
assertNotFrozen();
fCondition = (ICPPASTExpression) expression;
if (expression != null) {
expression.setParent(this);
expression.setPropertyInParent(LOGICAL_CONDITION);
}
}
@Override
public IASTExpression getPositiveResultExpression() {
return fPositive;
}
@Override
public void setPositiveResultExpression(IASTExpression expression) {
assertNotFrozen();
this.fPositive = (ICPPASTExpression) expression;
if (expression != null) {
expression.setParent(this);
expression.setPropertyInParent(POSITIVE_RESULT);
}
}
@Override
public IASTExpression getNegativeResultExpression() {
return fNegative;
}
@Override
public void setNegativeResultExpression(IASTExpression expression) {
assertNotFrozen();
this.fNegative = (ICPPASTExpression) expression;
if (expression != null) {
expression.setParent(this);
expression.setPropertyInParent(NEGATIVE_RESULT);
}
}
@Override
public boolean accept(ASTVisitor action) {
if (action.shouldVisitExpressions) {
switch (action.visit(this)) {
case ASTVisitor.PROCESS_ABORT: return false;
case ASTVisitor.PROCESS_SKIP: return true;
default: break;
}
}
if (fCondition != null && !fCondition.accept(action))
return false;
if (fPositive != null && !fPositive.accept(action))
return false;
if (fNegative != null && !fNegative.accept(action))
return false;
if (action.shouldVisitExpressions && action.leave(this) == ASTVisitor.PROCESS_ABORT)
return false;
return true;
}
@Override
public void replace(IASTNode child, IASTNode other) {
if (child == fCondition) {
other.setPropertyInParent(child.getPropertyInParent());
other.setParent(child.getParent());
fCondition = (ICPPASTExpression) other;
}
if (child == fPositive) {
other.setPropertyInParent(child.getPropertyInParent());
other.setParent(child.getParent());
fPositive = (ICPPASTExpression) other;
}
if (child == fNegative) {
other.setPropertyInParent(child.getPropertyInParent());
other.setParent(child.getParent());
fNegative = (ICPPASTExpression) other;
}
}
private boolean isThrowExpression(IASTExpression expr) {
while (expr instanceof IASTUnaryExpression) {
final IASTUnaryExpression unaryExpr = (IASTUnaryExpression) expr;
final int op = unaryExpr.getOperator();
if (op == IASTUnaryExpression.op_throw) {
return true;
} else if (op == IASTUnaryExpression.op_bracketedPrimary) {
expr= unaryExpr.getOperand();
} else {
return false;
}
}
return false;
}
@Override
public ICPPEvaluation getEvaluation() {
if (fEval == null) {
if (fCondition == null || fNegative == null) {
fEval= EvalFixed.INCOMPLETE;
} else {
final ICPPEvaluation condEval = fCondition.getEvaluation();
final ICPPEvaluation posEval = fPositive == null ? null : fPositive.getEvaluation();
fEval= new EvalConditional(condEval, posEval, fNegative.getEvaluation(),
isThrowExpression(fPositive), isThrowExpression(fNegative));
}
}
return fEval;
}
@Override
public IType getExpressionType() {
return getEvaluation().getTypeOrFunctionSet(this);
}
@Override
public ValueCategory getValueCategory() {
return getEvaluation().getValueCategory(this);
}
@Override
public boolean isLValue() {
return getValueCategory() == LVALUE;
}
}
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