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/*
* Copyright 2000-2013 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.resolve.graphInference;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTypesUtil;
import com.intellij.psi.util.PsiUtil;
import com.intellij.psi.util.TypeConversionUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
/**
* User: anna
*/
public class PsiPolyExpressionUtil {
public static boolean hasStandaloneForm(PsiExpression expression) {
if (expression instanceof PsiLambdaExpression ||
expression instanceof PsiMethodReferenceExpression ||
expression instanceof PsiParenthesizedExpression ||
expression instanceof PsiConditionalExpression ||
expression instanceof PsiCallExpression) {
return false;
}
return true;
}
public static boolean isPolyExpression(PsiExpression expression) {
if (expression instanceof PsiLambdaExpression || expression instanceof PsiMethodReferenceExpression) {
return true;
}
else if (expression instanceof PsiParenthesizedExpression) {
return isPolyExpression(((PsiParenthesizedExpression)expression).getExpression());
}
else if (expression instanceof PsiNewExpression) {
final PsiJavaCodeReferenceElement classReference = ((PsiNewExpression)expression).getClassReference();
if (classReference != null) {
final PsiReferenceParameterList parameterList = classReference.getParameterList();
if (parameterList != null) {
final PsiTypeElement[] typeElements = parameterList.getTypeParameterElements();
if (typeElements.length == 1 && typeElements[0].getType() instanceof PsiDiamondType) {
return isInAssignmentOrInvocationContext(expression);
}
}
}
} else if (expression instanceof PsiMethodCallExpression) {
if (isInAssignmentOrInvocationContext(expression) && ((PsiMethodCallExpression)expression).getTypeArguments().length == 0) {
final PsiMethod method = ((PsiMethodCallExpression)expression).resolveMethod();
if (method != null) {
final Set<PsiTypeParameter> typeParameters = new HashSet<PsiTypeParameter>(Arrays.asList(method.getTypeParameters()));
if (typeParameters.size() > 0) {
final PsiType returnType = method.getReturnType();
if (returnType != null) {
return mentionsTypeParameters(returnType, typeParameters);
}
}
}
}
}
else if (expression instanceof PsiConditionalExpression) {
final ConditionalKind conditionalKind = isBooleanOrNumeric(expression);
if (conditionalKind == null) {
return isInAssignmentOrInvocationContext(expression);
}
}
return false;
}
public static PsiType getTargetType(@NotNull PsiCallExpression expression) {
return PsiTypesUtil.getExpectedTypeByParent(expression);
}
public static Boolean mentionsTypeParameters(@Nullable PsiType returnType, final Set<PsiTypeParameter> typeParameters) {
if (returnType == null) return false;
return returnType.accept(new PsiTypeVisitor<Boolean>() {
@Nullable
@Override
public Boolean visitType(PsiType type) {
return false;
}
@Nullable
@Override
public Boolean visitWildcardType(PsiWildcardType wildcardType) {
final PsiType bound = wildcardType.getBound();
if (bound != null) {
return bound.accept(this);
}
return false;
}
@Nullable
@Override
public Boolean visitClassType(PsiClassType classType) {
for (PsiType type : classType.getParameters()) {
if (type.accept(this)) return true;
}
final PsiClass psiClass = classType.resolve();
return psiClass instanceof PsiTypeParameter && typeParameters.contains(psiClass);
}
@Nullable
@Override
public Boolean visitArrayType(PsiArrayType arrayType) {
return arrayType.getComponentType().accept(this);
}
});
}
private static boolean isInAssignmentOrInvocationContext(PsiExpression expr) {
final PsiElement context = expr.getParent();
return context instanceof PsiExpressionList || isAssignmentContext(expr, context);
}
private static boolean isAssignmentContext(PsiExpression expr, PsiElement context) {
return PsiUtil.isCondition(expr, context) ||
context instanceof PsiReturnStatement ||
context instanceof PsiAssignmentExpression ||
context instanceof PsiVariable;
}
private enum ConditionalKind {
BOOLEAN, NUMERIC
}
private static ConditionalKind isBooleanOrNumeric(PsiExpression expr) {
if (expr instanceof PsiParenthesizedExpression) {
return isBooleanOrNumeric(((PsiParenthesizedExpression)expr).getExpression());
}
PsiType type = null;
if (expr instanceof PsiNewExpression || hasStandaloneForm(expr)) {
type = expr.getType();
} else if (expr instanceof PsiMethodCallExpression) {
final PsiMethod method = ((PsiMethodCallExpression)expr).resolveMethod();
if (method != null) {
type = method.getReturnType();
}
}
if (TypeConversionUtil.isNumericType(type)) return ConditionalKind.NUMERIC;
if (TypeConversionUtil.isBooleanType(type)) return ConditionalKind.BOOLEAN;
if (expr instanceof PsiConditionalExpression) {
final PsiExpression thenExpression = ((PsiConditionalExpression)expr).getThenExpression();
final PsiExpression elseExpression = ((PsiConditionalExpression)expr).getElseExpression();
final ConditionalKind thenKind = isBooleanOrNumeric(thenExpression);
final ConditionalKind elseKind = isBooleanOrNumeric(elseExpression);
if (thenKind == elseKind) return thenKind;
}
return null;
}
}
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