1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/*
* 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.impl.source.tree.java.PsiMethodCallExpressionImpl;
import com.intellij.psi.infos.MethodCandidateInfo;
import com.intellij.psi.util.PsiUtil;
import com.intellij.psi.util.TypeConversionUtil;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.containers.HashSet;
import org.jetbrains.annotations.NotNull;
import java.util.Collection;
import java.util.Iterator;
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) {
typeParams = method.getTypeParameters();
}
} 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 Set<PsiTypeParameter> oldBounds = ContainerUtil.newHashSet(session.getParamsToInfer());
final boolean sameMethodCall = session.initBounds(myExpression, typeParams);
PsiSubstitutor substitutor = PsiSubstitutor.EMPTY;
final HashSet<InferenceVariable> variables = new HashSet<InferenceVariable>();
session.collectDependencies(returnType, variables);
final PsiTypeParameter[] params = new PsiTypeParameter[typeParams.length];
for (int i = 0; i < typeParams.length; i++) {
if (variables.contains(session.getInferenceVariable(typeParams[i]))) {
params[i] = JavaPsiFacade.getElementFactory(myExpression.getProject()).createTypeParameterFromText("copyOf" + myExpression.hashCode() + typeParams[i].getName(), null);
substitutor = substitutor.put(typeParams[i], JavaPsiFacade.getElementFactory(myExpression.getProject()).createType(params[i]));
}
else {
params[i] = typeParams[i];
}
}
PsiSubstitutor siteSubstitutor = PsiSubstitutor.EMPTY;
if (method != null && !method.isConstructor()) {
if (resolveResult instanceof MethodCandidateInfo) {
siteSubstitutor = ((MethodCandidateInfo)resolveResult).getSiteSubstitutor();
}
else if (candidateProperties != null) {
siteSubstitutor = candidateProperties.getSubstitutor();
}
}
for (PsiTypeParameter typeParameter : siteSubstitutor.getSubstitutionMap().keySet()) {
substitutor = substitutor.put(typeParameter, substitutor.substitute(siteSubstitutor.substitute(typeParameter)));
}
final Collection<PsiTypeParameter> params1 = session.getTypeParams();
final InferenceSession callSession = new InferenceSession(params, substitutor, myExpression.getManager(), myExpression);
callSession.initBounds(session.getContext(), params1.toArray(new PsiTypeParameter[params1.size()]));
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(
method != null && !PsiUtil.isRawSubstitutor(method, siteSubstitutor) ? siteSubstitutor.substitute(returnType) : returnType,
substitutor.substitute(returnType));
if (callSession.repeatInferencePhases(true)) {
final Collection<InferenceVariable> inferenceVariables = callSession.getInferenceVariables();
if (sameMethodCall) {
for (Iterator<InferenceVariable> iterator = inferenceVariables.iterator(); iterator.hasNext(); ) {
InferenceVariable variable = iterator.next();
if (oldBounds.contains(variable.getParameter())) {
iterator.remove();
}
}
}
session.liftBounds(myExpression, inferenceVariables);
} else {
return false;
}
final PsiType capturedReturnType = myExpression instanceof PsiMethodCallExpression
? PsiMethodCallExpressionImpl.captureReturnType((PsiMethodCallExpression)myExpression, method, returnType, substitutor)
: substitutor.substitute(returnType);
constraints.add(new TypeCompatibilityConstraint(myT, capturedReturnType));
}
}
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);
}
}
}
}
}
}
|
