| /* |
| * 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.openapi.util.Pair; |
| 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.impl.source.tree.java.PsiMethodCallExpressionImpl; |
| import com.intellij.psi.infos.MethodCandidateInfo; |
| import com.intellij.psi.util.TypeConversionUtil; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.*; |
| |
| /** |
| * User: anna |
| */ |
| public class ExpressionCompatibilityConstraint extends InputOutputConstraintFormula { |
| private 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 != null && !exprType.equals(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 Pair<PsiMethod,PsiSubstitutor> pair = MethodCandidateInfo.getCurrentMethod(argumentList); |
| final PsiMethod method = pair != null ? pair.first : ((PsiCallExpression)myExpression).resolveMethod(); |
| PsiType returnType = null; |
| InferenceSession callSession = null; |
| if (method != null) { |
| returnType = method.getReturnType(); |
| final PsiParameter[] parameters = method.getParameterList().getParameters(); |
| if (returnType != null) { |
| callSession = new InferenceSession(method.getTypeParameters(), parameters, |
| argumentList.getExpressions(), |
| PsiSubstitutor.EMPTY, null, myExpression.getManager()); |
| |
| } |
| } 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); |
| callSession = new InferenceSession(((PsiClass)psiClass).getTypeParameters(), |
| PsiParameter.EMPTY_ARRAY, |
| argumentList.getExpressions(), |
| PsiSubstitutor.EMPTY, null, myExpression.getManager()); |
| } |
| } |
| } |
| |
| if (callSession != null) { |
| |
| for (PsiTypeParameter typeParameter : session.getTypeParams()) { |
| callSession.addCapturedVariable(typeParameter); |
| } |
| callSession.addConstraint(new TypeCompatibilityConstraint(myT, returnType)); |
| final PsiSubstitutor callSubstitutor = callSession.infer(); |
| |
| if (myExpression instanceof PsiMethodCallExpression) { |
| returnType = PsiMethodCallExpressionImpl.captureReturnType((PsiMethodCallExpression)myExpression, method, returnType, callSubstitutor); |
| } |
| else { |
| returnType = callSubstitutor.substitute(returnType); |
| } |
| constraints.add(new TypeCompatibilityConstraint(myT, returnType)); //todo primitive types |
| } |
| } |
| 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; |
| if (!myT.equals(that.myT)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = myExpression.hashCode(); |
| result = 31 * result + myT.hashCode(); |
| return result; |
| } |
| |
| @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); |
| } |
| } |
| } |
| } |
| } |
| } |