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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
* Mike Kucera (IBM)
* 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.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTImplicitName;
import org.eclipse.cdt.core.dom.ast.IASTInitializerClause;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTArraySubscriptExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTInitializerClause;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunction;
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.EvalBinary;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalFixed;
public class CPPASTArraySubscriptExpression extends ASTNode
implements ICPPASTArraySubscriptExpression, IASTAmbiguityParent {
private ICPPASTExpression arrayExpression;
private ICPPASTInitializerClause subscriptExp;
private ICPPEvaluation evaluation;
private IASTImplicitName[] implicitNames;
public CPPASTArraySubscriptExpression() {
}
public CPPASTArraySubscriptExpression(IASTExpression arrayExpression, IASTInitializerClause operand) {
setArrayExpression(arrayExpression);
setArgument(operand);
}
@Override
public CPPASTArraySubscriptExpression copy() {
return copy(CopyStyle.withoutLocations);
}
@Override
public CPPASTArraySubscriptExpression copy(CopyStyle style) {
CPPASTArraySubscriptExpression copy = new CPPASTArraySubscriptExpression();
copy.setArrayExpression(arrayExpression == null ? null : arrayExpression.copy(style));
copy.setArgument(subscriptExp == null ? null : subscriptExp.copy(style));
copy.setOffsetAndLength(this);
if (style == CopyStyle.withLocations) {
copy.setCopyLocation(this);
}
return copy;
}
@Override
public ICPPASTExpression getArrayExpression() {
return arrayExpression;
}
@Override
public void setArrayExpression(IASTExpression expression) {
assertNotFrozen();
if (expression != null) {
if (!(expression instanceof ICPPASTExpression))
throw new IllegalArgumentException(expression.getClass().getName());
expression.setParent(this);
expression.setPropertyInParent(ARRAY);
}
arrayExpression = (ICPPASTExpression) expression;
}
@Override
public ICPPASTInitializerClause getArgument() {
return subscriptExp;
}
@Override
public void setArgument(IASTInitializerClause arg) {
assertNotFrozen();
if (arg != null) {
if (!(arg instanceof ICPPASTInitializerClause))
throw new IllegalArgumentException(arg.getClass().getName());
arg.setParent(this);
arg.setPropertyInParent(SUBSCRIPT);
}
subscriptExp = (ICPPASTInitializerClause) arg;
}
@Override
@Deprecated
public IASTExpression getSubscriptExpression() {
if (subscriptExp instanceof IASTExpression)
return (IASTExpression) subscriptExp;
return null;
}
@Override
@Deprecated
public void setSubscriptExpression(IASTExpression expression) {
setArgument(expression);
}
@Override
public IASTImplicitName[] getImplicitNames() {
if (implicitNames == null) {
ICPPFunction overload = getOverload();
if (overload == null || overload instanceof CPPImplicitFunction)
return implicitNames = IASTImplicitName.EMPTY_NAME_ARRAY;
// create separate implicit names for the two brackets
CPPASTImplicitName n1 = new CPPASTImplicitName(OverloadableOperator.BRACKET, this);
n1.setBinding(overload);
n1.computeOperatorOffsets(arrayExpression, true);
CPPASTImplicitName n2 = new CPPASTImplicitName(OverloadableOperator.BRACKET, this);
n2.setBinding(overload);
n2.computeOperatorOffsets(subscriptExp, true);
n2.setAlternate(true);
implicitNames = new IASTImplicitName[] { n1, n2 };
}
return implicitNames;
}
private ICPPFunction getOverload() {
ICPPEvaluation eval = getEvaluation();
if (eval instanceof EvalBinary)
return ((EvalBinary) eval).getOverload(this);
return null;
}
@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 (arrayExpression != null && !arrayExpression.accept(action))
return false;
IASTImplicitName[] implicits = action.shouldVisitImplicitNames ? getImplicitNames() : null;
if (implicits != null && implicits.length > 0 && !implicits[0].accept(action))
return false;
if (subscriptExp != null && !subscriptExp.accept(action))
return false;
if (implicits != null && implicits.length > 0 && !implicits[1].accept(action))
return false;
if (action.shouldVisitExpressions) {
switch (action.leave(this)) {
case ASTVisitor.PROCESS_ABORT: return false;
case ASTVisitor.PROCESS_SKIP: return true;
default: break;
}
}
return true;
}
@Override
public void replace(IASTNode child, IASTNode other) {
if (child == subscriptExp) {
other.setPropertyInParent(child.getPropertyInParent());
other.setParent(child.getParent());
subscriptExp = (ICPPASTExpression) other;
}
if (child == arrayExpression) {
other.setPropertyInParent(child.getPropertyInParent());
other.setParent(child.getParent());
arrayExpression = (ICPPASTExpression) other;
}
}
@Override
public ICPPEvaluation getEvaluation() {
if (evaluation == null)
evaluation= computeEvaluation();
return evaluation;
}
private ICPPEvaluation computeEvaluation() {
if (arrayExpression == null || subscriptExp == null)
return EvalFixed.INCOMPLETE;
return new EvalBinary(EvalBinary.op_arrayAccess, arrayExpression.getEvaluation(), subscriptExp.getEvaluation());
}
@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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