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/*
* 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.BetterPrefixMatcher;
import com.intellij.codeInsight.completion.impl.CamelHumpMatcher;
import com.intellij.codeInsight.lookup.AutoCompletionPolicy;
import com.intellij.codeInsight.lookup.LookupElement;
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.Consumer;
import org.jetbrains.annotations.NotNull;
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.GrModifierList;
import org.jetbrains.plugins.groovy.lang.psi.api.auxiliary.modifiers.annotation.GrAnnotation;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.GrAnnotationTypeDefinition;
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 boolean suggestMetaAnnotations(CompletionParameters parameters) {
PsiElement position = parameters.getPosition();
return PsiJavaPatterns.psiElement().withParents(GrCodeReferenceElement.class, GrAnnotation.class, GrModifierList.class, GrAnnotationTypeDefinition.class).accepts(position);
}
@Override
public void fillCompletionVariants(@NotNull final CompletionParameters parameters, @NotNull CompletionResultSet result) {
LinkedHashSet<CompletionResult> plainResults = result.runRemainingContributors(parameters, true);
final boolean empty = JavaNoVariantsDelegator.containsOnlyPackages(plainResults) || suggestMetaAnnotations(parameters);
if (!empty && parameters.getInvocationCount() == 0) {
result.restartCompletionWhenNothingMatches();
}
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) &&
!GroovySmartCompletionContributor.AFTER_NEW.accepts(parameters.getPosition())) {
result = result.withPrefixMatcher(new BetterPrefixMatcher(result.getPrefixMatcher(), BetterPrefixMatcher.getBestMatchingDegree(plainResults)));
suggestNonImportedClasses(parameters, result);
}
}
}
private static void delegate(CompletionParameters parameters, CompletionResultSet result) {
if (parameters.getCompletionType() == CompletionType.BASIC) {
if (parameters.getInvocationCount() <= 1 &&
JavaCompletionContributor.mayStartClassName(result) &&
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, new Consumer<LookupElement>() {
@Override
public void consume(LookupElement element) {
JavaPsiClassReferenceElement classElement =
element.as(JavaPsiClassReferenceElement.CLASS_CONDITION_KEY);
if (classElement != null) {
classElement.setAutoCompletionPolicy(AutoCompletionPolicy.NEVER_AUTOCOMPLETE);
}
result.addElement(element);
}
}, new InheritorsHolder(parameters.getPosition(), 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);
InheritorsHolder inheritors = new InheritorsHolder(position, result);
for (final LookupElement base : suggestQualifierItems(parameters, (GrReferenceElement)qualifier, inheritors)) {
final PsiType type = JavaCompletionUtil.getLookupElementType(base);
if (type != null && !PsiType.VOID.equals(type)) {
GrReferenceElement ref = createMockReference(position, type, base);
PsiElement refName = ref.getReferenceNameElement();
assert refName != null;
CompletionParameters newParams = parameters.withPosition(refName, refName.getTextRange().getStartOffset());
GrMainCompletionProvider.completeReference(newParams, ref, inheritors, result.getPrefixMatcher(), new Consumer<LookupElement>() {
@Override
public void consume(LookupElement element) {
qualifiedCollector.addElement(new JavaChainLookupElement(base, element) {
@Override
protected boolean shouldParenthesizeQualifier(PsiFile file, int startOffset, int endOffset) {
return false;
}
});
}
});
}
}
}
private static GrReferenceElement createMockReference(final PsiElement place, @NotNull PsiType qualifierType, LookupElement qualifierItem) {
GroovyPsiElementFactory factory = GroovyPsiElementFactory.getInstance(place.getProject());
if (qualifierItem.getObject() instanceof PsiClass) {
return factory
.createReferenceExpressionFromText(((PsiClass)qualifierItem.getObject()).getQualifiedName() + ".xxx", place);
}
return factory.createReferenceExpressionFromText("xxx.xxx",
JavaCompletionUtil
.createContextWithXxxVariable(place, qualifierType));
}
private static Set<LookupElement> suggestQualifierItems(CompletionParameters _parameters,
GrReferenceElement qualifier,
InheritorsHolder inheritors) {
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<LookupElement>();
GrMainCompletionProvider.completeReference(parameters, qualifier, inheritors, qMatcher, new Consumer<LookupElement>() {
@Override
public void consume(LookupElement 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, new Consumer<LookupElement>() {
@Override
public void consume(LookupElement element) {
if (qMatcher.prefixMatches(element)) {
variants.add(element);
}
}
}, inheritors, qMatcher);
}
return variants;
}
}
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