/*
* Copyright 2000-2017 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 org.jetbrains.plugins.groovy.lang.psi.impl.statements.expressions;
import com.intellij.lang.ASTNode;
import com.intellij.psi.*;
import com.intellij.psi.impl.source.resolve.ResolveCache;
import com.intellij.psi.scope.ElementClassHint;
import com.intellij.psi.scope.PsiScopeProcessor;
import com.intellij.psi.tree.IElementType;
import com.intellij.util.ConcurrencyUtil;
import com.intellij.util.SmartList;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.lexer.GroovyTokenTypes;
import org.jetbrains.plugins.groovy.lang.lexer.TokenSets;
import org.jetbrains.plugins.groovy.lang.psi.GroovyElementVisitor;
import org.jetbrains.plugins.groovy.lang.psi.api.GroovyResolveResult;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrAssignmentExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrParenthesizedExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrReferenceExpression;
import org.jetbrains.plugins.groovy.lang.psi.dataFlow.types.TypeInferenceHelper;
import org.jetbrains.plugins.groovy.lang.psi.impl.GroovyFileImpl;
import org.jetbrains.plugins.groovy.lang.psi.impl.statements.GrOperatorExpressionImpl;
import org.jetbrains.plugins.groovy.lang.psi.impl.synthetic.GrBindingVariable;
import org.jetbrains.plugins.groovy.lang.resolve.DependentResolver;
import org.jetbrains.plugins.groovy.lang.resolve.ResolveUtil;
import org.jetbrains.plugins.groovy.lang.resolve.processors.DynamicMembersHint;
import java.util.Collection;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.ConcurrentMap;
/**
* @author ilyas
*/
public class GrAssignmentExpressionImpl extends GrOperatorExpressionImpl implements GrAssignmentExpression {
public GrAssignmentExpressionImpl(@NotNull ASTNode node) {
super(node);
}
public String toString() {
return "Assignment expression";
}
@Override
@NotNull
public GrExpression getLValue() {
return Objects.requireNonNull(findExpressionChild(this));
}
@Override
@Nullable
public GrExpression getRValue() {
GrExpression[] exprs = findChildrenByClass(GrExpression.class);
if (exprs.length > 1) {
return exprs[1];
}
return null;
}
@Override
@NotNull
public PsiElement getOperationToken() {
return findNotNullChildByType(TokenSets.ASSIGNMENTS);
}
@Override
public void accept(GroovyElementVisitor visitor) {
visitor.visitAssignmentExpression(this);
}
@NotNull
@Override
public GroovyResolveResult[] multiResolve(boolean incompleteCode) {
return TypeInferenceHelper.getCurrentContext().multiResolve(this, incompleteCode, RESOLVER);
}
@Override
public PsiReference getReference() {
final IElementType operationToken = getOperationTokenType();
if (operationToken == GroovyTokenTypes.mASSIGN) return null;
return this;
}
@Override
public boolean processDeclarations(@NotNull PsiScopeProcessor processor,
@NotNull ResolveState state,
@Nullable PsiElement lastParent,
@NotNull PsiElement place) {
if (!shouldProcessBindings(this, processor, lastParent, place)) return true;
return processLValue(processor, state, place, (GroovyFileImpl)getParent(), getLValue());
}
static boolean shouldProcessBindings(@NotNull PsiElement owner,
@NotNull PsiScopeProcessor processor,
@Nullable PsiElement lastParent,
@NotNull PsiElement place) {
final ElementClassHint classHint = processor.getHint(ElementClassHint.KEY);
if (!ResolveUtil.shouldProcessProperties(classHint)) return false;
final DynamicMembersHint dynamicMembersHint = processor.getHint(DynamicMembersHint.KEY);
if (dynamicMembersHint != null && !dynamicMembersHint.shouldProcessProperties()) return false;
PsiElement parent = owner.getParent();
if (!(parent instanceof GroovyFileImpl)) return false;
final GroovyFileImpl file = (GroovyFileImpl)parent;
if (!file.isInScriptBody(lastParent, place)) return false;
return true;
}
static boolean processLValue(@NotNull PsiScopeProcessor processor,
@NotNull ResolveState state,
@NotNull PsiElement place,
@NotNull GroovyFileImpl file,
@NotNull GrExpression lValue) {
if (!(lValue instanceof GrReferenceExpression)) return true;
final GrReferenceExpression lReference = (GrReferenceExpression)lValue;
if (lReference.isQualified()) return true;
final String name = lReference.getReferenceName();
if (name == null) return true;
String hintName = ResolveUtil.getNameHint(processor);
if (hintName != null && !name.equals(hintName)) return true;
if (lReference != place && lReference.resolve() != null && !(lReference.resolve() instanceof GrBindingVariable)) return true;
final ConcurrentMap<String, GrBindingVariable> bindings = file.getBindings();
GrBindingVariable variable = bindings.get(name);
if (variable == null) {
variable = ConcurrencyUtil.cacheOrGet(bindings, name, new GrBindingVariable(file, name, true));
}
if (!variable.hasWriteAccess()) return true;
return processor.execute(variable, state);
}
@Nullable
@Override
public PsiType getLeftType() {
return getLValue().getType();
}
@Nullable
@Override
public PsiType getRightType() {
GrExpression rValue = getRValue();
return rValue == null ? null : rValue.getType();
}
@Nullable
@Override
public PsiType getType() {
if (TokenSets.ASSIGNMENTS_TO_OPERATORS.containsKey(getOperationTokenType())) {
return super.getType();
}
else {
return getRightType();
}
}
private static final ResolveCache.PolyVariantResolver<GrAssignmentExpression> RESOLVER = new DependentResolver<GrAssignmentExpression>() {
@Override
public Collection<PsiPolyVariantReference> collectDependencies(@NotNull GrAssignmentExpression ref) {
List<PsiPolyVariantReference> result = new SmartList<>();
ref.accept(new PsiRecursiveElementWalkingVisitor() {
@Override
public void visitElement(PsiElement element) {
if (element instanceof GrAssignmentExpression) {
super.visitElement(element);
}
else if (element instanceof GrParenthesizedExpression) {
GrExpression operand = ((GrParenthesizedExpression)element).getOperand();
if (operand != null) super.visitElement(operand);
}
}
@Override
protected void elementFinished(PsiElement element) {
if (element instanceof GrAssignmentExpression) {
result.add(((GrAssignmentExpression)element));
}
}
});
return result;
}
@NotNull
@Override
public ResolveResult[] doResolve(@NotNull GrAssignmentExpression assignmentExpression, boolean incomplete) {
final IElementType opType = assignmentExpression.getOperationTokenType();
if (opType == GroovyTokenTypes.mASSIGN) return GroovyResolveResult.EMPTY_ARRAY;
PsiType lType = assignmentExpression.getLeftType();
if (lType == null) return GroovyResolveResult.EMPTY_ARRAY;
PsiType rType = assignmentExpression.getRightType();
final IElementType operatorToken = TokenSets.ASSIGNMENTS_TO_OPERATORS.get(opType);
return TypesUtil.getOverloadedOperatorCandidates(lType, operatorToken, assignmentExpression, new PsiType[]{rType});
}
};
}