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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.*;
import com.intellij.diagnostic.LogMessageEx;
import com.intellij.diagnostic.AttachmentFactory;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.util.ClassConditionKey;
import com.intellij.openapi.util.Key;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.*;
import com.intellij.psi.codeStyle.CodeStyleManager;
import com.intellij.psi.codeStyle.CodeStyleSettingsManager;
import com.intellij.psi.impl.DebugUtil;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.text.CharArrayUtil;
import gnu.trove.THashSet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Set;
/**
* @author peter
*/
public class JavaChainLookupElement extends LookupElementDecorator<LookupElement> implements TypedLookupItem {
public static final Key<Boolean> CHAIN_QUALIFIER = Key.create("CHAIN_QUALIFIER");
private static final Logger LOG = Logger.getInstance("#com.intellij.codeInsight.completion.JavaChainLookupElement");
public static final ClassConditionKey<JavaChainLookupElement> CLASS_CONDITION_KEY = ClassConditionKey.create(JavaChainLookupElement.class);
private final LookupElement myQualifier;
public JavaChainLookupElement(LookupElement qualifier, LookupElement main) {
super(main);
myQualifier = qualifier;
}
@NotNull
@Override
public String getLookupString() {
return maybeAddParentheses(myQualifier.getLookupString()) + "." + getDelegate().getLookupString();
}
public LookupElement getQualifier() {
return myQualifier;
}
@Override
public Set<String> getAllLookupStrings() {
final Set<String> strings = getDelegate().getAllLookupStrings();
final THashSet<String> result = new THashSet<String>();
result.addAll(strings);
result.add(getLookupString());
return result;
}
@NotNull
@Override
public String toString() {
return maybeAddParentheses(myQualifier.toString()) + "." + getDelegate();
}
private String maybeAddParentheses(String s) {
return getQualifierObject() instanceof PsiMethod ? s + "()" : s;
}
@Nullable
private Object getQualifierObject() {
Object qObject = myQualifier.getObject();
if (qObject instanceof ResolveResult) {
qObject = ((ResolveResult)qObject).getElement();
}
return qObject;
}
@Override
public boolean isValid() {
return super.isValid() && myQualifier.isValid();
}
@Override
public void renderElement(LookupElementPresentation presentation) {
super.renderElement(presentation);
final LookupElementPresentation qualifierPresentation = new LookupElementPresentation();
myQualifier.renderElement(qualifierPresentation);
String name = maybeAddParentheses(qualifierPresentation.getItemText());
final String qualifierText = myQualifier.as(CastingLookupElementDecorator.CLASS_CONDITION_KEY) != null ? "(" + name + ")" : name;
presentation.setItemText(qualifierText + "." + presentation.getItemText());
if (myQualifier instanceof LookupItem && getQualifierObject() instanceof PsiClass) {
String locationString = JavaPsiClassReferenceElement.getLocationString((LookupItem)myQualifier);
presentation.setTailText(StringUtil.notNullize(presentation.getTailText()) + locationString);
}
}
@Override
public void handleInsert(InsertionContext context) {
final Document document = context.getEditor().getDocument();
document.replaceString(context.getStartOffset(), context.getTailOffset(), ";");
myQualifier.putUserData(CHAIN_QUALIFIER, true);
final InsertionContext qualifierContext = CompletionUtil.emulateInsertion(context, context.getStartOffset(), myQualifier);
OffsetKey oldStart = context.trackOffset(context.getStartOffset(), false);
PsiDocumentManager.getInstance(context.getProject()).doPostponedOperationsAndUnblockDocument(document);
int start = CharArrayUtil.shiftForward(context.getDocument().getCharsSequence(), context.getStartOffset(), " \t\n");
if (shouldParenthesizeQualifier(context.getFile(), start, qualifierContext.getTailOffset())) {
final String space = CodeStyleSettingsManager.getSettings(qualifierContext.getProject()).SPACE_WITHIN_PARENTHESES ? " " : "";
document.insertString(start, "(" + space);
document.insertString(qualifierContext.getTailOffset(), space + ")");
}
final char atTail = document.getCharsSequence().charAt(context.getTailOffset() - 1);
if (atTail != ';') {
LOG.error(LogMessageEx.createEvent("Unexpected character",
"atTail=" + atTail + "\n" +
"offset=" + context.getTailOffset() + "\n" +
"item=" + this + "\n" +
"item.class=" + this.getClass() + "\n" +
DebugUtil.currentStackTrace(),
AttachmentFactory.createAttachment(context.getDocument())));
}
document.replaceString(context.getTailOffset() - 1, context.getTailOffset(), ".");
CompletionUtil.emulateInsertion(getDelegate(), context.getTailOffset(), context);
context.commitDocument();
int formatStart = context.getOffset(oldStart);
int formatEnd = context.getTailOffset();
if (formatStart >= 0 && formatEnd >= 0) {
CodeStyleManager.getInstance(context.getProject()).reformatText(context.getFile(), formatStart, formatEnd);
}
}
protected boolean shouldParenthesizeQualifier(final PsiFile file, final int startOffset, final int endOffset) {
PsiElement element = file.findElementAt(startOffset);
if (element == null) {
return false;
}
PsiElement last = element;
while (element != null &&
element.getTextRange().getStartOffset() >= startOffset && element.getTextRange().getEndOffset() <= endOffset &&
!(element instanceof PsiExpressionStatement)) {
last = element;
element = element.getParent();
}
PsiExpression expr = PsiTreeUtil.getParentOfType(last, PsiExpression.class, false, PsiClass.class);
if (expr == null) {
return false;
}
if (expr.getTextRange().getEndOffset() > endOffset) {
return true;
}
if (expr instanceof PsiJavaCodeReferenceElement ||
expr instanceof PsiMethodCallExpression ||
expr instanceof PsiNewExpression ||
expr instanceof PsiArrayAccessExpression) {
return false;
}
return true;
}
@NotNull
private LookupElement getComparableQualifier() {
final CastingLookupElementDecorator casting = myQualifier.as(CastingLookupElementDecorator.CLASS_CONDITION_KEY);
return casting == null ? myQualifier : casting.getDelegate();
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
return getComparableQualifier().equals(((JavaChainLookupElement)o).getComparableQualifier());
}
@Override
public int hashCode() {
return 31 * super.hashCode() + getComparableQualifier().hashCode();
}
@Override
public PsiType getType() {
final Object object = getObject();
if (object instanceof PsiMember) {
return JavaCompletionUtil.getQualifiedMemberReferenceType(JavaCompletionUtil.getLookupElementType(myQualifier), (PsiMember)object);
}
return ((PsiVariable) object).getType();
}
}
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