/*
* Copyright 2000-2014 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.completion;
import com.intellij.codeInsight.completion.*;
import com.intellij.codeInsight.completion.impl.CamelHumpMatcher;
import com.intellij.codeInsight.lookup.AutoCompletionPolicy;
import com.intellij.codeInsight.lookup.LookupElement;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.registry.Registry;
import com.intellij.patterns.PsiJavaPatterns;
import com.intellij.psi.*;
import com.intellij.psi.search.PsiShortNamesCache;
import com.intellij.util.IncorrectOperationException;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.lang.psi.GrReferenceElement;
import org.jetbrains.plugins.groovy.lang.psi.GroovyPsiElementFactory;
import org.jetbrains.plugins.groovy.lang.psi.api.auxiliary.modifiers.annotation.GrAnnotation;
import org.jetbrains.plugins.groovy.lang.psi.api.types.GrCodeReferenceElement;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* @author peter
*/
public class GroovyNoVariantsDelegator extends CompletionContributor {
private static final Logger LOG = Logger.getInstance("#org.jetbrains.plugins.groovy.lang.completion.GroovyNoVariantsDelegator");
private static boolean suggestAnnotations(CompletionParameters parameters) {
return PsiJavaPatterns.psiElement().withParents(GrCodeReferenceElement.class, GrAnnotation.class).accepts(parameters.getPosition());
}
@Override
public void fillCompletionVariants(@NotNull final CompletionParameters parameters, @NotNull CompletionResultSet result) {
JavaNoVariantsDelegator.ResultTracker tracker = new JavaNoVariantsDelegator.ResultTracker(result);
result.runRemainingContributors(parameters, tracker);
final boolean empty = tracker.containsOnlyPackages || suggestAnnotations(parameters);
if (GrMainCompletionProvider.isClassNamePossible(parameters.getPosition()) && !JavaCompletionContributor.mayStartClassName(result)) {
result.restartCompletionOnAnyPrefixChange();
}
if (empty) {
delegate(parameters, result);
} else if (Registry.is("ide.completion.show.better.matching.classes")) {
if (parameters.getCompletionType() == CompletionType.BASIC &&
parameters.getInvocationCount() <= 1 &&
JavaCompletionContributor.mayStartClassName(result) &&
GrMainCompletionProvider.isClassNamePossible(parameters.getPosition()) &&
!MapArgumentCompletionProvider.isMapKeyCompletion(parameters) &&
!areNonImportedInheritorsAlreadySuggested(parameters)) {
result = result.withPrefixMatcher(tracker.betterMatcher);
suggestNonImportedClasses(parameters, result);
}
}
}
private static boolean areNonImportedInheritorsAlreadySuggested(@NotNull CompletionParameters parameters) {
return GroovySmartCompletionContributor.AFTER_NEW.accepts(parameters.getPosition()) &&
GroovySmartCompletionContributor.getExpectedTypes(parameters).length > 0;
}
private static void delegate(CompletionParameters parameters, CompletionResultSet result) {
if (parameters.getCompletionType() == CompletionType.BASIC) {
if (parameters.getInvocationCount() <= 1 &&
(JavaCompletionContributor.mayStartClassName(result) || suggestAnnotations(parameters)) &&
GrMainCompletionProvider.isClassNamePossible(parameters.getPosition()) &&
!MapArgumentCompletionProvider.isMapKeyCompletion(parameters)) {
suggestNonImportedClasses(parameters, result);
}
suggestChainedCalls(parameters, result);
}
}
private static void suggestNonImportedClasses(CompletionParameters parameters, final CompletionResultSet result) {
GrMainCompletionProvider.addAllClasses(parameters, element -> {
JavaPsiClassReferenceElement classElement =
element.as(JavaPsiClassReferenceElement.CLASS_CONDITION_KEY);
if (classElement != null) {
classElement.setAutoCompletionPolicy(AutoCompletionPolicy.NEVER_AUTOCOMPLETE);
}
result.addElement(element);
}, new JavaCompletionSession(result), result.getPrefixMatcher());
}
private static void suggestChainedCalls(CompletionParameters parameters, CompletionResultSet result) {
PsiElement position = parameters.getPosition();
PsiElement parent = position.getParent();
if (!(parent instanceof GrReferenceElement)) {
return;
}
PsiElement qualifier = ((GrReferenceElement)parent).getQualifier();
if (!(qualifier instanceof GrReferenceElement) ||
((GrReferenceElement)qualifier).getQualifier() != null) {
return;
}
PsiElement target = ((GrReferenceElement)qualifier).resolve();
if (target != null && !(target instanceof PsiPackage)) {
return;
}
String fullPrefix = position.getContainingFile().getText().substring(parent.getTextRange().getStartOffset(), parameters.getOffset());
final CompletionResultSet qualifiedCollector = result.withPrefixMatcher(fullPrefix);
JavaCompletionSession session = new JavaCompletionSession(result);
for (final LookupElement base : suggestQualifierItems(parameters, (GrReferenceElement)qualifier, session)) {
final PsiType type = getPsiType(base.getObject());
if (type != null && !PsiType.VOID.equals(type)) {
GrReferenceElement ref = createMockReference(position, type, base);
PsiElement refName = ref == null ? null : ref.getReferenceNameElement();
if (refName == null) continue;
CompletionParameters newParams = parameters.withPosition(refName, refName.getTextRange().getStartOffset());
GrMainCompletionProvider.completeReference(newParams, ref, session, result.getPrefixMatcher(), element ->
qualifiedCollector.addElement(new JavaChainLookupElement(base, element) {
@Override
protected boolean shouldParenthesizeQualifier(PsiFile file, int startOffset, int endOffset) {
return false;
}
}));
}
}
}
@Nullable
private static PsiType getPsiType(final Object o) {
if (o instanceof ResolveResult) {
return getPsiType(((ResolveResult)o).getElement());
}
if (o instanceof PsiVariable) {
return ((PsiVariable)o).getType();
}
else if (o instanceof PsiMethod) {
return ((PsiMethod)o).getReturnType();
}
else if (o instanceof PsiClass) {
final PsiClass psiClass = (PsiClass)o;
return JavaPsiFacade.getElementFactory(psiClass.getProject()).createType(psiClass);
}
return null;
}
@Nullable
private static GrReferenceElement createMockReference(final PsiElement place, @NotNull PsiType qualifierType, LookupElement qualifierItem) {
GroovyPsiElementFactory factory = GroovyPsiElementFactory.getInstance(place.getProject());
if (qualifierItem.getObject() instanceof PsiClass) {
try {
return factory
.createReferenceExpressionFromText(((PsiClass)qualifierItem.getObject()).getQualifiedName() + ".xxx", place);
}
catch (IncorrectOperationException e) {
LOG.debug(e);
return null;
}
}
return factory.createReferenceExpressionFromText("xxx.xxx",
JavaCompletionUtil
.createContextWithXxxVariable(place, qualifierType));
}
private static Set<LookupElement> suggestQualifierItems(CompletionParameters _parameters,
GrReferenceElement qualifier,
JavaCompletionSession session) {
CompletionParameters parameters =
_parameters.withPosition(qualifier.getReferenceNameElement(), qualifier.getTextRange().getEndOffset());
String referenceName = qualifier.getReferenceName();
if (referenceName == null) {
return Collections.emptySet();
}
final PrefixMatcher qMatcher = new CamelHumpMatcher(referenceName);
final Set<LookupElement> variants = new LinkedHashSet<>();
GrMainCompletionProvider.completeReference(parameters, qualifier, session, qMatcher, element -> {
if (qMatcher.prefixMatches(element)) {
variants.add(element);
}
});
for (PsiClass aClass : PsiShortNamesCache.getInstance(qualifier.getProject()).getClassesByName(referenceName, qualifier.getResolveScope())) {
variants.add(GroovyCompletionUtil.createClassLookupItem(aClass));
}
if (variants.isEmpty()) {
GrMainCompletionProvider.addAllClasses(parameters, element -> {
if (qMatcher.prefixMatches(element)) {
variants.add(element);
}
}, session, qMatcher);
}
return variants;
}
}