| /* |
| * 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.constraints; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.impl.source.resolve.graphInference.InferenceSession; |
| import com.intellij.psi.impl.source.resolve.graphInference.InferenceVariable; |
| import com.intellij.psi.impl.source.resolve.graphInference.PsiPolyExpressionUtil; |
| import com.intellij.psi.infos.MethodCandidateInfo; |
| import com.intellij.psi.util.PsiUtil; |
| import com.intellij.psi.util.TypeConversionUtil; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Set; |
| |
| /** |
| * User: anna |
| */ |
| public class ExpressionCompatibilityConstraint extends InputOutputConstraintFormula { |
| private final PsiExpression myExpression; |
| private PsiType myT; |
| |
| public ExpressionCompatibilityConstraint(@NotNull PsiExpression expression, @NotNull PsiType type) { |
| myExpression = expression; |
| myT = type; |
| } |
| |
| @Override |
| public boolean reduce(InferenceSession session, List<ConstraintFormula> constraints) { |
| if (!PsiPolyExpressionUtil.isPolyExpression(myExpression)) { |
| if (session.isProperType(myT)) { |
| return TypeConversionUtil.areTypesAssignmentCompatible(myT, myExpression); |
| } |
| |
| final PsiType exprType = myExpression.getType(); |
| |
| if (exprType instanceof PsiLambdaParameterType) { |
| return false; |
| } |
| |
| if (exprType != null && exprType != PsiType.NULL) { |
| constraints.add(new TypeCompatibilityConstraint(myT, exprType)); |
| } |
| return true; |
| } |
| if (myExpression instanceof PsiParenthesizedExpression) { |
| final PsiExpression expression = ((PsiParenthesizedExpression)myExpression).getExpression(); |
| if (expression != null) { |
| constraints.add(new ExpressionCompatibilityConstraint(expression, myT)); |
| return true; |
| } |
| } |
| |
| if (myExpression instanceof PsiConditionalExpression) { |
| final PsiExpression thenExpression = ((PsiConditionalExpression)myExpression).getThenExpression(); |
| if (thenExpression != null) { |
| constraints.add(new ExpressionCompatibilityConstraint(thenExpression, myT)); |
| } |
| |
| final PsiExpression elseExpression = ((PsiConditionalExpression)myExpression).getElseExpression(); |
| if (elseExpression != null) { |
| constraints.add(new ExpressionCompatibilityConstraint(elseExpression, myT)); |
| } |
| return true; |
| } |
| |
| if (myExpression instanceof PsiCallExpression) { |
| final PsiExpressionList argumentList = ((PsiCallExpression)myExpression).getArgumentList(); |
| if (argumentList != null) { |
| final MethodCandidateInfo.CurrentCandidateProperties candidateProperties = MethodCandidateInfo.getCurrentMethod(((PsiCallExpression)myExpression).getArgumentList()); |
| final JavaResolveResult resolveResult = candidateProperties != null ? null : ((PsiCallExpression)myExpression).resolveMethodGenerics(); |
| final PsiMethod method = candidateProperties != null ? candidateProperties.getMethod() : (PsiMethod)resolveResult.getElement(); |
| PsiType returnType = null; |
| PsiTypeParameter[] typeParams = null; |
| if (method != null && !method.isConstructor()) { |
| returnType = method.getReturnType(); |
| if (returnType != null) { |
| List<PsiTypeParameter> params = new ArrayList<PsiTypeParameter>(); |
| for (PsiTypeParameter parameter : PsiUtil.typeParametersIterable(method)) { |
| params.add(parameter); |
| } |
| typeParams = params.toArray(new PsiTypeParameter[params.size()]); |
| } |
| } else if (myExpression instanceof PsiNewExpression) { //default constructor |
| final PsiJavaCodeReferenceElement classReference = ((PsiNewExpression)myExpression).getClassOrAnonymousClassReference(); |
| if (classReference != null) { |
| final PsiElement psiClass = classReference.resolve(); |
| if (psiClass instanceof PsiClass) { |
| returnType = JavaPsiFacade.getElementFactory(argumentList.getProject()).createType((PsiClass)psiClass, PsiSubstitutor.EMPTY); |
| typeParams = ((PsiClass)psiClass).getTypeParameters(); |
| } |
| } |
| } |
| |
| if (typeParams != null) { |
| final InferenceSession callSession = new InferenceSession(typeParams, PsiSubstitutor.EMPTY, myExpression.getManager(), myExpression); |
| callSession.propagateVariables(session.getInferenceVariables()); |
| if (method != null) { |
| final PsiExpression[] args = argumentList.getExpressions(); |
| final PsiParameter[] parameters = method.getParameterList().getParameters(); |
| callSession.initExpressionConstraints(parameters, args, myExpression, method, resolveResult instanceof MethodCandidateInfo && ((MethodCandidateInfo)resolveResult).isVarargs() || |
| candidateProperties != null && candidateProperties.isVarargs()); |
| } |
| final boolean accepted = callSession.repeatInferencePhases(true); |
| if (!accepted) { |
| return false; |
| } |
| callSession.registerReturnTypeConstraints(returnType, myT); |
| if (callSession.repeatInferencePhases(true)) { |
| session.registerNestedSession(callSession); |
| } else { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| if (myExpression instanceof PsiMethodReferenceExpression) { |
| constraints.add(new PsiMethodReferenceCompatibilityConstraint(((PsiMethodReferenceExpression)myExpression), myT)); |
| return true; |
| } |
| |
| if (myExpression instanceof PsiLambdaExpression) { |
| constraints.add(new LambdaExpressionCompatibilityConstraint((PsiLambdaExpression)myExpression, myT)); |
| return true; |
| } |
| |
| |
| return true; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| ExpressionCompatibilityConstraint that = (ExpressionCompatibilityConstraint)o; |
| |
| if (!myExpression.equals(that.myExpression)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| return myExpression.hashCode(); |
| } |
| |
| @Override |
| public PsiExpression getExpression() { |
| return myExpression; |
| } |
| |
| @Override |
| public PsiType getT() { |
| return myT; |
| } |
| |
| @Override |
| protected void setT(PsiType t) { |
| myT = t; |
| } |
| |
| @Override |
| protected InputOutputConstraintFormula createSelfConstraint(PsiType type, PsiExpression expression) { |
| return new ExpressionCompatibilityConstraint(expression, type); |
| } |
| |
| protected void collectReturnTypeVariables(InferenceSession session, |
| PsiExpression psiExpression, |
| PsiType returnType, |
| Set<InferenceVariable> result) { |
| if (psiExpression instanceof PsiLambdaExpression) { |
| if (returnType != PsiType.VOID) { |
| final List<PsiExpression> returnExpressions = LambdaUtil.getReturnExpressions((PsiLambdaExpression)psiExpression); |
| for (PsiExpression expression : returnExpressions) { |
| final Set<InferenceVariable> resultInputVars = createSelfConstraint(returnType, expression).getInputVariables(session); |
| if (resultInputVars != null) { |
| result.addAll(resultInputVars); |
| } |
| } |
| } |
| } |
| } |
| } |