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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.psi.impl.source.tree.java;
import com.intellij.lang.ASTNode;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.psi.*;
import com.intellij.psi.impl.source.resolve.graphInference.InferenceSession;
import com.intellij.psi.impl.source.resolve.graphInference.PsiPolyExpressionUtil;
import com.intellij.psi.impl.source.tree.ChildRole;
import com.intellij.psi.impl.source.tree.ElementType;
import com.intellij.psi.impl.source.tree.JavaElementType;
import com.intellij.psi.infos.MethodCandidateInfo;
import com.intellij.psi.tree.ChildRoleBase;
import com.intellij.psi.util.PsiUtil;
import com.intellij.psi.util.TypeConversionUtil;
import org.jetbrains.annotations.NotNull;
public class PsiConditionalExpressionImpl extends ExpressionPsiElement implements PsiConditionalExpression {
private static final Logger LOG = Logger.getInstance("#com.intellij.psi.impl.source.tree.java.PsiConditionalExpressionImpl");
public PsiConditionalExpressionImpl() {
super(JavaElementType.CONDITIONAL_EXPRESSION);
}
@Override
@NotNull
public PsiExpression getCondition() {
return (PsiExpression)findChildByRoleAsPsiElement(ChildRole.CONDITION);
}
@Override
public PsiExpression getThenExpression() {
return (PsiExpression)findChildByRoleAsPsiElement(ChildRole.THEN_EXPRESSION);
}
@Override
public PsiExpression getElseExpression() {
return (PsiExpression)findChildByRoleAsPsiElement(ChildRole.ELSE_EXPRESSION);
}
/**
* JLS 15.25
*/
@Override
public PsiType getType() {
PsiExpression expr1 = getThenExpression();
PsiExpression expr2 = getElseExpression();
PsiType type1 = expr1 == null ? null : expr1.getType();
PsiType type2 = expr2 == null ? null : expr2.getType();
if (type1 == null) return type2;
if (type2 == null) return type1;
if (type1.equals(type2)) return type1;
final int typeRank1 = TypeConversionUtil.getTypeRank(type1);
final int typeRank2 = TypeConversionUtil.getTypeRank(type2);
// bug in JLS3, see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6888770
if (type1 instanceof PsiClassType && type2.equals(PsiPrimitiveType.getUnboxedType(type1))) return type2;
if (type2 instanceof PsiClassType && type1.equals(PsiPrimitiveType.getUnboxedType(type2))) return type1;
if (TypeConversionUtil.isNumericType(typeRank1) && TypeConversionUtil.isNumericType(typeRank2)){
if (typeRank1 == TypeConversionUtil.BYTE_RANK && typeRank2 == TypeConversionUtil.SHORT_RANK) {
return type2 instanceof PsiPrimitiveType ? type2 : PsiPrimitiveType.getUnboxedType(type2);
}
if (typeRank1 == TypeConversionUtil.SHORT_RANK && typeRank2 == TypeConversionUtil.BYTE_RANK) {
return type1 instanceof PsiPrimitiveType ? type1 : PsiPrimitiveType.getUnboxedType(type1);
}
if (typeRank2 == TypeConversionUtil.INT_RANK && (typeRank1 == TypeConversionUtil.BYTE_RANK || typeRank1 == TypeConversionUtil.SHORT_RANK || typeRank1 == TypeConversionUtil.CHAR_RANK)){
if (TypeConversionUtil.areTypesAssignmentCompatible(type1, expr2)) return type1;
}
if (typeRank1 == TypeConversionUtil.INT_RANK && (typeRank2 == TypeConversionUtil.BYTE_RANK || typeRank2 == TypeConversionUtil.SHORT_RANK || typeRank2 == TypeConversionUtil.CHAR_RANK)){
if (TypeConversionUtil.areTypesAssignmentCompatible(type2, expr1)) return type2;
}
return TypeConversionUtil.binaryNumericPromotion(type1, type2);
}
if (TypeConversionUtil.isNullType(type1) && !(type2 instanceof PsiPrimitiveType)) return type2;
if (TypeConversionUtil.isNullType(type2) && !(type1 instanceof PsiPrimitiveType)) return type1;
if (PsiUtil.isLanguageLevel8OrHigher(this) &&
PsiPolyExpressionUtil.isPolyExpression(this) &&
!MethodCandidateInfo.ourOverloadGuard.currentStack().contains(this.getParent())) {
//15.25.3 Reference Conditional Expressions
// The type of a poly reference conditional expression is the same as its target type.
return InferenceSession.getTargetType(this);
}
if (TypeConversionUtil.isAssignable(type1, type2, false)) return type1;
if (TypeConversionUtil.isAssignable(type2, type1, false)) return type2;
if (!PsiUtil.isLanguageLevel5OrHigher(this)) {
return null;
}
if (TypeConversionUtil.isPrimitiveAndNotNull(type1)) {
type1 = ((PsiPrimitiveType)type1).getBoxedType(this);
if (type1 == null) return null;
}
if (TypeConversionUtil.isPrimitiveAndNotNull(type2)) {
type2 = ((PsiPrimitiveType)type2).getBoxedType(this);
if (type2 == null) return null;
}
if (type1 instanceof PsiLambdaParameterType || type2 instanceof PsiLambdaParameterType) return null;
final PsiType leastUpperBound = GenericsUtil.getLeastUpperBound(type1, type2, getManager());
return leastUpperBound != null ? PsiUtil.captureToplevelWildcards(leastUpperBound, this) : null;
}
@Override
public ASTNode findChildByRole(int role) {
LOG.assertTrue(ChildRole.isUnique(role));
switch(role){
default:
return null;
case ChildRole.CONDITION:
return getFirstChildNode();
case ChildRole.QUEST:
return findChildByType(JavaTokenType.QUEST);
case ChildRole.THEN_EXPRESSION:
ASTNode quest = findChildByRole(ChildRole.QUEST);
ASTNode child = quest.getTreeNext();
while(true){
if (child == null) return null;
if (ElementType.EXPRESSION_BIT_SET.contains(child.getElementType())) break;
child = child.getTreeNext();
}
return child;
case ChildRole.COLON:
return findChildByType(JavaTokenType.COLON);
case ChildRole.ELSE_EXPRESSION:
ASTNode colon = findChildByRole(ChildRole.COLON);
if (colon == null) return null;
return ElementType.EXPRESSION_BIT_SET.contains(getLastChildNode().getElementType()) ? getLastChildNode() : null;
}
}
@Override
public int getChildRole(ASTNode child) {
LOG.assertTrue(child.getTreeParent() == this);
if (ElementType.EXPRESSION_BIT_SET.contains(child.getElementType())){
int role = getChildRole(child, ChildRole.CONDITION);
if (role != ChildRoleBase.NONE) return role;
role = getChildRole(child, ChildRole.THEN_EXPRESSION);
if (role != ChildRoleBase.NONE) return role;
role = getChildRole(child, ChildRole.ELSE_EXPRESSION);
return role;
}
if (child.getElementType() == JavaTokenType.QUEST){
return ChildRole.QUEST;
}
if (child.getElementType() == JavaTokenType.COLON){
return ChildRole.COLON;
}
return ChildRoleBase.NONE;
}
@Override
public void accept(@NotNull PsiElementVisitor visitor) {
if (visitor instanceof JavaElementVisitor) {
((JavaElementVisitor)visitor).visitConditionalExpression(this);
}
else {
visitor.visitElement(this);
}
}
public String toString() {
return "PsiConditionalExpression:" + getText();
}
}
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