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/*
* Copyright 2000-2009 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.lookup.LookupElement;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.paths.PsiDynaReference;
import com.intellij.openapi.util.Ref;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.PsiReference;
import com.intellij.psi.ReferenceRange;
import com.intellij.psi.impl.source.resolve.reference.impl.PsiMultiReference;
import com.intellij.util.PairConsumer;
import org.jetbrains.annotations.NotNull;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Set;
/**
* @author peter
*/
public class LegacyCompletionContributor extends CompletionContributor {
private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.completion.LegacyCompletionContributor");
@Override
public void fillCompletionVariants(@NotNull CompletionParameters parameters, @NotNull CompletionResultSet _result) {
if (parameters.getCompletionType() != CompletionType.BASIC) {
return;
}
CompletionData completionData = getCompletionData(parameters);
if (completionData == null) return;
final PsiElement insertedElement = parameters.getPosition();
final CompletionResultSet result = _result.withPrefixMatcher(completionData.findPrefix(insertedElement, parameters.getOffset()));
completeReference(parameters, result);
final Set<LookupElement> lookupSet = new LinkedHashSet<LookupElement>();
final Set<CompletionVariant> keywordVariants = new HashSet<CompletionVariant>();
PsiFile file = parameters.getOriginalFile();
completionData.addKeywordVariants(keywordVariants, insertedElement, file);
completionData.completeKeywordsBySet(lookupSet, keywordVariants, insertedElement, result.getPrefixMatcher(), file);
result.addAllElements(lookupSet);
}
public static boolean completeReference(final CompletionParameters parameters, final CompletionResultSet result) {
final CompletionData completionData = getCompletionData(parameters);
if (completionData == null) {
return false;
}
final Ref<Boolean> hasVariants = Ref.create(false);
processReferences(parameters, result, new PairConsumer<PsiReference, CompletionResultSet>() {
@Override
public void consume(final PsiReference reference, final CompletionResultSet resultSet) {
final Set<LookupElement> lookupSet = new LinkedHashSet<LookupElement>();
completionData
.completeReference(reference, lookupSet, parameters.getPosition(), parameters.getOriginalFile(), parameters.getOffset());
for (final LookupElement item : lookupSet) {
if (resultSet.getPrefixMatcher().prefixMatches(item)) {
hasVariants.set(true);
resultSet.addElement(item);
}
}
}
});
return hasVariants.get().booleanValue();
}
private static CompletionData getCompletionData(CompletionParameters parameters) {
final PsiElement position = parameters.getPosition();
return CompletionUtil.getCompletionDataByElement(position, parameters.getOriginalFile());
}
public static void processReferences(final CompletionParameters parameters,
final CompletionResultSet result,
final PairConsumer<PsiReference, CompletionResultSet> consumer) {
final int startOffset = parameters.getOffset();
final PsiReference ref = parameters.getPosition().getContainingFile().findReferenceAt(startOffset);
if (ref instanceof PsiMultiReference) {
for (final PsiReference reference : CompletionData.getReferences((PsiMultiReference)ref)) {
processReference(result, startOffset, consumer, reference);
}
}
else if (ref instanceof PsiDynaReference) {
for (final PsiReference reference : ((PsiDynaReference<?>)ref).getReferences()) {
processReference(result, startOffset, consumer, reference);
}
}
else if (ref != null) {
processReference(result, startOffset, consumer, ref);
}
}
private static void processReference(final CompletionResultSet result,
final int startOffset,
final PairConsumer<PsiReference, CompletionResultSet> consumer,
final PsiReference reference) {
PsiElement element = reference.getElement();
final int offsetInElement = startOffset - element.getTextRange().getStartOffset();
if (!ReferenceRange.containsOffsetInElement(reference, offsetInElement)) {
return;
}
TextRange range = reference.getRangeInElement();
try {
final String prefix = element.getText().substring(range.getStartOffset(), offsetInElement);
consumer.consume(reference, result.withPrefixMatcher(prefix));
}
catch (StringIndexOutOfBoundsException e) {
LOG.error("Reference=" + reference +
"; element=" + element + " of " + element.getClass() +
"; range=" + range +
"; offset=" + offsetInElement,
e);
}
}
}
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