@Override
public String handleEmptyLookup(
@NotNull final CompletionParameters parameters, final Editor editor) {
if (!(parameters.getOriginalFile() instanceof PsiJavaFile)) return null;
final String ad = advertise(parameters);
final String suffix = ad == null ? "" : "; " + StringUtil.decapitalize(ad);
if (parameters.getCompletionType() == CompletionType.SMART) {
if (!ApplicationManager.getApplication().isUnitTestMode()) {
final Project project = parameters.getPosition().getProject();
final PsiFile file = parameters.getOriginalFile();
PsiExpression expression =
PsiTreeUtil.getContextOfType(parameters.getPosition(), PsiExpression.class, true);
if (expression != null && expression.getParent() instanceof PsiExpressionList) {
int lbraceOffset = expression.getParent().getTextRange().getStartOffset();
ShowParameterInfoHandler.invoke(project, editor, file, lbraceOffset, null);
}
if (expression instanceof PsiLiteralExpression) {
return LangBundle.message("completion.no.suggestions") + suffix;
}
if (expression instanceof PsiInstanceOfExpression) {
final PsiInstanceOfExpression instanceOfExpression = (PsiInstanceOfExpression) expression;
if (PsiTreeUtil.isAncestor(
instanceOfExpression.getCheckType(), parameters.getPosition(), false)) {
return LangBundle.message("completion.no.suggestions") + suffix;
}
}
}
final Set<PsiType> expectedTypes = JavaCompletionUtil.getExpectedTypes(parameters);
if (expectedTypes != null) {
PsiType type = expectedTypes.size() == 1 ? expectedTypes.iterator().next() : null;
if (type != null) {
final PsiType deepComponentType = type.getDeepComponentType();
if (deepComponentType instanceof PsiClassType) {
if (((PsiClassType) deepComponentType).resolve() != null) {
return CompletionBundle.message(
"completion.no.suggestions.of.type", type.getPresentableText())
+ suffix;
}
return CompletionBundle.message("completion.unknown.type", type.getPresentableText())
+ suffix;
}
if (!PsiType.NULL.equals(type)) {
return CompletionBundle.message(
"completion.no.suggestions.of.type", type.getPresentableText())
+ suffix;
}
}
}
}
return LangBundle.message("completion.no.suggestions") + suffix;
}
public static void addAllClasses(
CompletionParameters parameters,
final CompletionResultSet result,
final InheritorsHolder inheritors) {
if (!isClassNamePossible(parameters) || !mayStartClassName(result)) {
return;
}
if (parameters.getInvocationCount() >= 2) {
JavaClassNameCompletionContributor.addAllClasses(
parameters,
parameters.getInvocationCount() <= 2,
result.getPrefixMatcher(),
new Consumer<LookupElement>() {
@Override
public void consume(LookupElement element) {
if (!inheritors.alreadyProcessed(element)) {
result.addElement(element);
}
}
});
} else {
advertiseSecondCompletion(parameters.getPosition().getProject(), result);
}
}
public static void fillCompletionVariants(
CompletionParameters parameters, CompletionResultSet result) {
if (parameters.getCompletionType() != CompletionType.BASIC
&& parameters.getCompletionType() != CompletionType.SMART) {
return;
}
PsiElement position = parameters.getPosition();
if (psiElement(PsiIdentifier.class)
.withParents(PsiJavaCodeReferenceElement.class, PsiTypeElement.class, PsiClass.class)
.andNot(JavaCompletionData.AFTER_DOT)
.andNot(psiElement().afterLeaf(psiElement().inside(PsiModifierList.class)))
.accepts(position)) {
suggestGeneratedMethods(result, position);
} else if (psiElement(PsiIdentifier.class)
.withParents(
PsiJavaCodeReferenceElement.class,
PsiAnnotation.class,
PsiModifierList.class,
PsiClass.class)
.accepts(position)) {
PsiAnnotation annotation =
ObjectUtils.assertNotNull(PsiTreeUtil.getParentOfType(position, PsiAnnotation.class));
int annoStart = annotation.getTextRange().getStartOffset();
suggestGeneratedMethods(
result.withPrefixMatcher(
annotation.getText().substring(0, parameters.getOffset() - annoStart)),
position);
}
}
public static String findAlphanumericPrefix(CompletionParameters parameters) {
return findIdentifierPrefix(
parameters.getPosition().getContainingFile(),
parameters.getOffset(),
character().letterOrDigit(),
character().letterOrDigit());
}
public static boolean shouldShowFeature(
final CompletionParameters parameters, @NonNls final String id) {
if (FeatureUsageTracker.getInstance()
.isToBeAdvertisedInLookup(id, parameters.getPosition().getProject())) {
FeatureUsageTracker.getInstance().triggerFeatureShown(id);
return true;
}
return false;
}
@Nullable
public static Set<PsiType> getExpectedTypes(final CompletionParameters parameters) {
final PsiExpression expr =
PsiTreeUtil.getContextOfType(parameters.getPosition(), PsiExpression.class, true);
if (expr != null) {
final Set<PsiType> set = new THashSet<PsiType>();
for (final ExpectedTypeInfo expectedInfo :
JavaSmartCompletionContributor.getExpectedTypes(parameters)) {
set.add(expectedInfo.getType());
}
return set;
}
return null;
}
private static void addKeywords(CompletionParameters parameters, CompletionResultSet result) {
PsiElement position = parameters.getPosition();
final Set<LookupElement> lookupSet = new LinkedHashSet<LookupElement>();
final Set<CompletionVariant> keywordVariants = new HashSet<CompletionVariant>();
final JavaCompletionData completionData = getCompletionData(PsiUtil.getLanguageLevel(position));
completionData.addKeywordVariants(keywordVariants, position, parameters.getOriginalFile());
completionData.completeKeywordsBySet(
lookupSet,
keywordVariants,
position,
result.getPrefixMatcher(),
parameters.getOriginalFile());
completionData.fillCompletions(parameters, result);
for (final LookupElement item : lookupSet) {
result.addElement(item);
}
}
static boolean isClassNamePossible(CompletionParameters parameters) {
boolean isSecondCompletion = parameters.getInvocationCount() >= 2;
PsiElement position = parameters.getPosition();
if (JavaCompletionData.isInstanceofPlace(position)) return false;
final PsiElement parent = position.getParent();
if (!(parent instanceof PsiJavaCodeReferenceElement)) return isSecondCompletion;
if (((PsiJavaCodeReferenceElement) parent).getQualifier() != null) return isSecondCompletion;
if (parent instanceof PsiJavaCodeReferenceElementImpl
&& ((PsiJavaCodeReferenceElementImpl) parent).getKind()
== PsiJavaCodeReferenceElementImpl.PACKAGE_NAME_KIND) {
return false;
}
PsiElement grand = parent.getParent();
if (grand instanceof PsiSwitchLabelStatement) {
return false;
}
if (psiElement().inside(PsiImportStatement.class).accepts(parent)) {
return isSecondCompletion;
}
if (grand instanceof PsiAnonymousClass) {
grand = grand.getParent();
}
if (grand instanceof PsiNewExpression && ((PsiNewExpression) grand).getQualifier() != null) {
return false;
}
if (JavaCompletionData.isAfterPrimitiveOrArrayType(position)) {
return false;
}
return true;
}
@Override
public String advertise(@NotNull final CompletionParameters parameters) {
if (!(parameters.getOriginalFile() instanceof PsiJavaFile)) return null;
if (parameters.getCompletionType() == CompletionType.BASIC
&& parameters.getInvocationCount() > 0) {
PsiElement position = parameters.getPosition();
if (psiElement()
.withParent(
psiReferenceExpression()
.withFirstChild(psiReferenceExpression().referencing(psiClass())))
.accepts(position)) {
if (CompletionUtil.shouldShowFeature(
parameters, JavaCompletionFeatures.GLOBAL_MEMBER_NAME)) {
final String shortcut = getActionShortcut(IdeActions.ACTION_CODE_COMPLETION);
if (shortcut != null) {
return "Pressing "
+ shortcut
+ " twice without a class qualifier would show all accessible static methods";
}
}
}
}
if (parameters.getCompletionType() != CompletionType.SMART
&& shouldSuggestSmartCompletion(parameters.getPosition())) {
if (CompletionUtil.shouldShowFeature(
parameters, CodeCompletionFeatures.EDITING_COMPLETION_SMARTTYPE_GENERAL)) {
final String shortcut = getActionShortcut(IdeActions.ACTION_SMART_TYPE_COMPLETION);
if (shortcut != null) {
return CompletionBundle.message("completion.smart.hint", shortcut);
}
}
}
if (parameters.getCompletionType() == CompletionType.SMART
&& parameters.getInvocationCount() == 1) {
final PsiType[] psiTypes =
ExpectedTypesGetter.getExpectedTypes(parameters.getPosition(), true);
if (psiTypes.length > 0) {
if (CompletionUtil.shouldShowFeature(
parameters, JavaCompletionFeatures.SECOND_SMART_COMPLETION_TOAR)) {
final String shortcut = getActionShortcut(IdeActions.ACTION_SMART_TYPE_COMPLETION);
if (shortcut != null) {
for (final PsiType psiType : psiTypes) {
final PsiType type = PsiUtil.extractIterableTypeParameter(psiType, false);
if (type != null) {
return CompletionBundle.message(
"completion.smart.aslist.hint", shortcut, type.getPresentableText());
}
}
}
}
if (CompletionUtil.shouldShowFeature(
parameters, JavaCompletionFeatures.SECOND_SMART_COMPLETION_ASLIST)) {
final String shortcut = getActionShortcut(IdeActions.ACTION_SMART_TYPE_COMPLETION);
if (shortcut != null) {
for (final PsiType psiType : psiTypes) {
if (psiType instanceof PsiArrayType) {
final PsiType componentType = ((PsiArrayType) psiType).getComponentType();
if (!(componentType instanceof PsiPrimitiveType)) {
return CompletionBundle.message(
"completion.smart.toar.hint", shortcut, componentType.getPresentableText());
}
}
}
}
}
if (CompletionUtil.shouldShowFeature(
parameters, JavaCompletionFeatures.SECOND_SMART_COMPLETION_CHAIN)) {
final String shortcut = getActionShortcut(IdeActions.ACTION_SMART_TYPE_COMPLETION);
if (shortcut != null) {
return CompletionBundle.message("completion.smart.chain.hint", shortcut);
}
}
}
}
return null;
}
private static Set<String> addReferenceVariants(
final CompletionParameters parameters,
CompletionResultSet result,
final InheritorsHolder inheritors) {
final Set<String> usedWords = new HashSet<String>();
final PsiElement position = parameters.getPosition();
final boolean first = parameters.getInvocationCount() <= 1;
final boolean isSwitchLabel = SWITCH_LABEL.accepts(position);
final boolean isAfterNew = JavaClassNameCompletionContributor.AFTER_NEW.accepts(position);
final boolean pkgContext = JavaCompletionUtil.inSomePackage(position);
LegacyCompletionContributor.processReferences(
parameters,
result,
new PairConsumer<PsiReference, CompletionResultSet>() {
@Override
public void consume(final PsiReference reference, final CompletionResultSet result) {
if (reference instanceof PsiJavaReference) {
final ElementFilter filter = getReferenceFilter(position);
if (filter != null) {
final PsiFile originalFile = parameters.getOriginalFile();
JavaCompletionProcessor.Options options =
JavaCompletionProcessor.Options.DEFAULT_OPTIONS
.withCheckAccess(first)
.withFilterStaticAfterInstance(first)
.withShowInstanceInStaticContext(!first);
for (LookupElement element :
JavaCompletionUtil.processJavaReference(
position,
(PsiJavaReference) reference,
new ElementExtractorFilter(filter),
options,
result.getPrefixMatcher(),
parameters)) {
if (inheritors.alreadyProcessed(element)) {
continue;
}
if (isSwitchLabel) {
result.addElement(
TailTypeDecorator.withTail(element, TailType.createSimpleTailType(':')));
} else {
final LookupItem item = element.as(LookupItem.CLASS_CONDITION_KEY);
if (originalFile instanceof PsiJavaCodeReferenceCodeFragment
&& !((PsiJavaCodeReferenceCodeFragment) originalFile).isClassesAccepted()
&& item != null) {
item.setTailType(TailType.NONE);
}
result.addElement(element);
}
}
}
return;
}
if (reference instanceof PsiLabelReference) {
processLabelReference(result, (PsiLabelReference) reference);
return;
}
final Object[] variants = reference.getVariants();
if (variants == null) {
LOG.error("Reference=" + reference);
}
for (Object completion : variants) {
if (completion == null) {
LOG.error(
"Position="
+ position
+ "\n;Reference="
+ reference
+ "\n;variants="
+ Arrays.toString(variants));
}
if (completion instanceof LookupElement
&& !inheritors.alreadyProcessed((LookupElement) completion)) {
usedWords.add(((LookupElement) completion).getLookupString());
result.addElement((LookupElement) completion);
} else if (completion instanceof PsiClass) {
for (JavaPsiClassReferenceElement item :
JavaClassNameCompletionContributor.createClassLookupItems(
(PsiClass) completion,
isAfterNew,
JavaClassNameInsertHandler.JAVA_CLASS_INSERT_HANDLER,
new Condition<PsiClass>() {
@Override
public boolean value(PsiClass psiClass) {
return !inheritors.alreadyProcessed(psiClass)
&& JavaCompletionUtil.isSourceLevelAccessible(
position, psiClass, pkgContext);
}
})) {
usedWords.add(item.getLookupString());
result.addElement(item);
}
} else {
LookupElement element = LookupItemUtil.objectToLookupItem(completion);
usedWords.add(element.getLookupString());
result.addElement(element);
}
}
}
});
return usedWords;
}
@Override
public void fillCompletionVariants(
final CompletionParameters parameters, final CompletionResultSet _result) {
if (parameters.getCompletionType() != CompletionType.BASIC) {
return;
}
final PsiElement position = parameters.getPosition();
if (!isInJavaContext(position)) {
return;
}
if (AFTER_NUMBER_LITERAL.accepts(position)
|| UNEXPECTED_REFERENCE_AFTER_DOT.accepts(position)) {
_result.stopHere();
return;
}
final CompletionResultSet result = JavaCompletionSorting.addJavaSorting(parameters, _result);
if (ANNOTATION_ATTRIBUTE_NAME.accepts(position)
&& !JavaCompletionData.isAfterPrimitiveOrArrayType(position)) {
JavaCompletionData.addExpectedTypeMembers(parameters, result);
completeAnnotationAttributeName(result, position, parameters);
result.stopHere();
return;
}
final InheritorsHolder inheritors = new InheritorsHolder(position, result);
if (JavaSmartCompletionContributor.IN_TYPE_ARGS.accepts(position)) {
new TypeArgumentCompletionProvider(false, inheritors)
.addCompletions(parameters, new ProcessingContext(), result);
}
PrefixMatcher matcher = result.getPrefixMatcher();
if (JavaSmartCompletionContributor.AFTER_NEW.accepts(position)) {
new JavaInheritorsGetter(ConstructorInsertHandler.BASIC_INSTANCE)
.generateVariants(parameters, matcher, inheritors);
}
if (IMPORT_REFERENCE.accepts(position)) {
result.addElement(LookupElementBuilder.create("*"));
}
addKeywords(parameters, result);
Set<String> usedWords = addReferenceVariants(parameters, result, inheritors);
if (psiElement().inside(PsiLiteralExpression.class).accepts(position)) {
PsiReference reference = position.getContainingFile().findReferenceAt(parameters.getOffset());
if (reference == null || reference.isSoft()) {
WordCompletionContributor.addWordCompletionVariants(result, parameters, usedWords);
}
}
JavaGenerateMemberCompletionContributor.fillCompletionVariants(parameters, result);
addAllClasses(parameters, result, inheritors);
final PsiElement parent = position.getParent();
if (parent instanceof PsiReferenceExpression
&& !((PsiReferenceExpression) parent).isQualified()
&& parameters.isExtendedCompletion()
&& StringUtil.isNotEmpty(matcher.getPrefix())) {
new JavaStaticMemberProcessor(parameters).processStaticMethodsGlobally(matcher, result);
}
result.stopHere();
}
@Nullable
public static String findReferencePrefix(CompletionParameters parameters) {
return CompletionData.getReferencePrefix(parameters.getPosition(), parameters.getOffset());
}
public static String findJavaIdentifierPrefix(CompletionParameters parameters) {
return findJavaIdentifierPrefix(parameters.getPosition(), parameters.getOffset());
}