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/*
* Copyright 2000-2012 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.codeInsight.completion;
import com.intellij.codeInsight.completion.scope.JavaCompletionProcessor;
import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.codeInsight.lookup.LookupElementWeigher;
import com.intellij.openapi.util.Condition;
import com.intellij.patterns.ElementPattern;
import com.intellij.psi.*;
import com.intellij.psi.filters.getters.MembersGetter;
import com.intellij.psi.impl.source.tree.JavaElementType;
import com.intellij.psi.impl.source.tree.java.PsiAnnotationImpl;
import com.intellij.psi.util.InheritanceUtil;
import com.intellij.psi.util.PropertyUtil;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.psi.util.PsiUtil;
import org.jetbrains.annotations.NotNull;
import java.util.Set;
import static com.intellij.patterns.PsiJavaPatterns.psiElement;
import static com.intellij.patterns.StandardPatterns.or;
/**
* @author peter
*/
public class PreferByKindWeigher extends LookupElementWeigher {
static final ElementPattern<PsiElement> IN_CATCH_TYPE =
psiElement().withParent(psiElement(PsiJavaCodeReferenceElement.class).
withParent(psiElement(PsiTypeElement.class).
withParent(or(psiElement(PsiCatchSection.class),
psiElement(PsiVariable.class).withParent(PsiCatchSection.class)))));
static final ElementPattern<PsiElement> IN_MULTI_CATCH_TYPE =
or(psiElement().afterLeaf(psiElement().withText("|").withParent(PsiTypeElement.class).withSuperParent(2, PsiCatchSection.class)),
psiElement().afterLeaf(psiElement().withText("|").withParent(PsiTypeElement.class).withSuperParent(2, PsiParameter.class)
.withSuperParent(3, PsiCatchSection.class)));
static final ElementPattern<PsiElement> INSIDE_METHOD_THROWS_CLAUSE =
psiElement().afterLeaf(PsiKeyword.THROWS, ",").inside(psiElement(JavaElementType.THROWS_LIST));
static final ElementPattern<PsiElement> IN_RESOURCE_TYPE =
psiElement().withParent(psiElement(PsiJavaCodeReferenceElement.class).
withParent(psiElement(PsiTypeElement.class).
withParent(or(psiElement(PsiResourceVariable.class), psiElement(PsiResourceList.class)))));
private final CompletionType myCompletionType;
private final PsiElement myPosition;
private final Set<PsiField> myNonInitializedFields;
@NotNull private final Condition<PsiClass> myRequiredSuper;
public PreferByKindWeigher(CompletionType completionType, final PsiElement position) {
super("kind");
myCompletionType = completionType;
myPosition = position;
myNonInitializedFields = JavaCompletionProcessor.getNonInitializedFields(position);
myRequiredSuper = createSuitabilityCondition(position);
}
private static Condition<PsiClass> createSuitabilityCondition(final PsiElement position) {
if (IN_CATCH_TYPE.accepts(position) ||
IN_MULTI_CATCH_TYPE.accepts(position) ||
JavaSmartCompletionContributor.AFTER_THROW_NEW.accepts(position) ||
INSIDE_METHOD_THROWS_CLAUSE.accepts(position)) {
return new Condition<PsiClass>() {
@Override
public boolean value(PsiClass psiClass) {
return InheritanceUtil.isInheritor(psiClass, CommonClassNames.JAVA_LANG_THROWABLE);
}
};
}
if (IN_RESOURCE_TYPE.accepts(position)) {
return new Condition<PsiClass>() {
@Override
public boolean value(PsiClass psiClass) {
return InheritanceUtil.isInheritor(psiClass, CommonClassNames.JAVA_LANG_AUTO_CLOSEABLE);
}
};
}
if (psiElement().withParents(PsiJavaCodeReferenceElement.class, PsiAnnotation.class).accepts(position)) {
final PsiAnnotation annotation = PsiTreeUtil.getParentOfType(position, PsiAnnotation.class);
assert annotation != null;
PsiAnnotationOwner owner = annotation.getOwner();
if (owner instanceof PsiModifierList || owner instanceof PsiTypeElement || owner instanceof PsiTypeParameter) {
PsiElement member = (PsiElement)owner;
if (member instanceof PsiModifierList) {
member = member.getParent();
}
if (member instanceof PsiTypeElement && member.getParent() instanceof PsiMethod) {
member = member.getParent();
}
final String[] elementTypeFields = PsiAnnotationImpl.getApplicableElementTypeFields(member);
return new Condition<PsiClass>() {
@Override
public boolean value(PsiClass psiClass) {
if (!psiClass.isAnnotationType()) {
return false;
}
return PsiAnnotationImpl.isAnnotationApplicable(false, psiClass, elementTypeFields, position.getResolveScope());
}
};
}
}
//noinspection unchecked
return Condition.FALSE;
}
enum MyResult {
annoMethod,
probableKeyword,
localOrParameter,
qualifiedWithField,
qualifiedWithGetter,
superMethodParameters,
normal,
collectionFactory,
expectedTypeMember,
suitableClass,
nonInitialized,
classLiteral,
classNameOrGlobalStatic,
}
@NotNull
@Override
public MyResult weigh(@NotNull LookupElement item) {
final Object object = item.getObject();
if (object instanceof PsiKeyword) {
String keyword = ((PsiKeyword)object).getText();
if (PsiKeyword.RETURN.equals(keyword) && isLastStatement(PsiTreeUtil.getParentOfType(myPosition, PsiStatement.class))) {
return MyResult.probableKeyword;
}
if (PsiKeyword.ELSE.equals(keyword) || PsiKeyword.FINALLY.equals(keyword)) {
return MyResult.probableKeyword;
}
}
if (myCompletionType == CompletionType.SMART) {
if (object instanceof PsiLocalVariable || object instanceof PsiParameter || object instanceof PsiThisExpression) {
return MyResult.localOrParameter;
}
}
if (object instanceof String && item.getUserData(JavaCompletionUtil.SUPER_METHOD_PARAMETERS) == Boolean.TRUE) {
return MyResult.superMethodParameters;
}
if (myCompletionType == CompletionType.SMART) {
if (item.getUserData(CollectionsUtilityMethodsProvider.COLLECTION_FACTORY) != null) {
return MyResult.collectionFactory;
}
if (Boolean.TRUE.equals(item.getUserData(MembersGetter.EXPECTED_TYPE_INHERITOR_MEMBER))) {
return MyResult.expectedTypeMember;
}
final JavaChainLookupElement chain = item.as(JavaChainLookupElement.CLASS_CONDITION_KEY);
if (chain != null) {
Object qualifier = chain.getQualifier().getObject();
if (qualifier instanceof PsiLocalVariable || qualifier instanceof PsiParameter) {
return MyResult.localOrParameter;
}
if (qualifier instanceof PsiField) {
return MyResult.qualifiedWithField;
}
if (qualifier instanceof PsiMethod && PropertyUtil.isSimplePropertyGetter((PsiMethod)qualifier)) {
return MyResult.qualifiedWithGetter;
}
}
return MyResult.normal;
}
if (myCompletionType == CompletionType.BASIC) {
StaticallyImportable callElement = item.as(StaticallyImportable.CLASS_CONDITION_KEY);
if (callElement != null && callElement.canBeImported() && !callElement.willBeImported()) {
return MyResult.classNameOrGlobalStatic;
}
if (object instanceof PsiKeyword && PsiKeyword.CLASS.equals(item.getLookupString())) {
return MyResult.classLiteral;
}
if (object instanceof PsiMethod && PsiUtil.isAnnotationMethod((PsiElement)object)) {
return MyResult.annoMethod;
}
if (object instanceof PsiClass) {
if (myRequiredSuper.value((PsiClass)object)) {
return MyResult.suitableClass;
}
return MyResult.classNameOrGlobalStatic;
}
if (object instanceof PsiField && myNonInitializedFields.contains(object)) {
return MyResult.nonInitialized;
}
}
return MyResult.normal;
}
private static boolean isLastStatement(PsiStatement statement) {
if (statement == null || !(statement.getParent() instanceof PsiCodeBlock)) {
return true;
}
PsiStatement[] siblings = ((PsiCodeBlock)statement.getParent()).getStatements();
return statement == siblings[siblings.length - 1];
}
}
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