/*
* Copyright 2000-2011 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.psi.impl.source.tree.java;
import com.intellij.lang.ASTNode;
import com.intellij.lang.java.JavaLanguage;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.Ref;
import com.intellij.psi.*;
import com.intellij.psi.impl.PsiImplUtil;
import com.intellij.psi.impl.source.tree.*;
import com.intellij.psi.scope.BaseScopeProcessor;
import com.intellij.psi.scope.ElementClassHint;
import com.intellij.psi.scope.NameHint;
import com.intellij.psi.scope.PsiScopeProcessor;
import com.intellij.psi.scope.util.PsiScopesUtil;
import com.intellij.psi.tree.ChildRoleBase;
import com.intellij.psi.tree.IElementType;
import gnu.trove.THashSet;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Collections;
import java.util.Set;
public class PsiCodeBlockImpl extends LazyParseablePsiElement implements PsiCodeBlock {
private static final Logger LOG = Logger.getInstance("#com.intellij.psi.impl.source.tree.java.PsiCodeBlockImpl");
public PsiCodeBlockImpl(CharSequence text) {
super(JavaElementType.CODE_BLOCK, text);
}
@Override
public void clearCaches() {
super.clearCaches();
myVariablesSet = null;
myClassesSet = null;
myConflict = false;
}
@Override
@NotNull
public PsiStatement[] getStatements() {
return PsiImplUtil.getChildStatements(this);
}
@Override
public PsiElement getFirstBodyElement() {
final PsiJavaToken lBrace = getLBrace();
if (lBrace == null) return null;
final PsiElement nextSibling = lBrace.getNextSibling();
return nextSibling == getRBrace() ? null : nextSibling;
}
@Override
public PsiElement getLastBodyElement() {
final PsiJavaToken rBrace = getRBrace();
if (rBrace != null) {
final PsiElement prevSibling = rBrace.getPrevSibling();
return prevSibling == getLBrace() ? null : prevSibling;
}
return getLastChild();
}
@Override
public PsiJavaToken getLBrace() {
return (PsiJavaToken)findChildByRoleAsPsiElement(ChildRole.LBRACE);
}
@Override
public PsiJavaToken getRBrace() {
return (PsiJavaToken)findChildByRoleAsPsiElement(ChildRole.RBRACE);
}
private volatile Set<String> myVariablesSet = null;
private volatile Set<String> myClassesSet = null;
private volatile boolean myConflict = false;
// return Pair(classes, locals) or null if there was conflict
@Nullable
private Pair<Set<String>, Set<String>> buildMaps() {
Set<String> set1 = myClassesSet;
Set<String> set2 = myVariablesSet;
boolean wasConflict = myConflict;
if (set1 == null || set2 == null) {
final Set<String> localsSet = new THashSet<String>();
final Set<String> classesSet = new THashSet<String>();
final Ref<Boolean> conflict = new Ref<Boolean>(Boolean.FALSE);
PsiScopesUtil.walkChildrenScopes(this, new BaseScopeProcessor() {
@Override
public boolean execute(@NotNull PsiElement element, ResolveState state) {
if (element instanceof PsiLocalVariable) {
final PsiLocalVariable variable = (PsiLocalVariable)element;
final String name = variable.getName();
if (!localsSet.add(name)) {
conflict.set(Boolean.TRUE);
localsSet.clear();
classesSet.clear();
}
}
else if (element instanceof PsiClass) {
final PsiClass psiClass = (PsiClass)element;
final String name = psiClass.getName();
if (!classesSet.add(name)) {
conflict.set(Boolean.TRUE);
localsSet.clear();
classesSet.clear();
}
}
return !conflict.get();
}
}, ResolveState.initial(), this, this);
myClassesSet = set1 = classesSet.isEmpty() ? Collections.<String>emptySet() : classesSet;
myVariablesSet = set2 = localsSet.isEmpty() ? Collections.<String>emptySet() : localsSet;
myConflict = wasConflict = conflict.get();
}
return wasConflict ? null : Pair.create(set1, set2);
}
@Override
public TreeElement addInternal(TreeElement first, ASTNode last, ASTNode anchor, Boolean before) {
if (anchor == null){
if (before == null || before.booleanValue()){
anchor = findChildByRole(ChildRole.RBRACE);
before = Boolean.TRUE;
}
else{
anchor = findChildByRole(ChildRole.LBRACE);
before = Boolean.FALSE;
}
}
if (before == Boolean.TRUE) {
while (isNonJavaStatement(anchor)) {
anchor = anchor.getTreePrev();
before = Boolean.FALSE;
}
}
else if (before == Boolean.FALSE) {
while (isNonJavaStatement(anchor)) {
anchor = anchor.getTreeNext();
before = Boolean.TRUE;
}
}
return super.addInternal(first, last, anchor, before);
}
private static boolean isNonJavaStatement(ASTNode anchor) {
final PsiElement psi = anchor.getPsi();
return psi instanceof PsiStatement && psi.getLanguage() != JavaLanguage.INSTANCE;
}
@Override
public ASTNode findChildByRole(int role) {
LOG.assertTrue(ChildRole.isUnique(role));
switch(role){
default:
return null;
case ChildRole.LBRACE:
return findChildByType(JavaTokenType.LBRACE);
case ChildRole.RBRACE:
return TreeUtil.findChildBackward(this, JavaTokenType.RBRACE);
}
}
@Override
public int getChildRole(ASTNode child) {
LOG.assertTrue(child.getTreeParent() == this);
IElementType i = child.getElementType();
if (i == JavaTokenType.LBRACE) {
return getChildRole(child, ChildRole.LBRACE);
}
else if (i == JavaTokenType.RBRACE) {
return getChildRole(child, ChildRole.RBRACE);
}
else {
return ChildRoleBase.NONE;
}
}
@Override
public void accept(@NotNull PsiElementVisitor visitor) {
if (visitor instanceof JavaElementVisitor) {
((JavaElementVisitor)visitor).visitCodeBlock(this);
}
else {
visitor.visitElement(this);
}
}
public String toString() {
return "PsiCodeBlock";
}
@Override
public boolean processDeclarations(@NotNull PsiScopeProcessor processor, @NotNull ResolveState state, PsiElement lastParent, @NotNull PsiElement place) {
processor.handleEvent(PsiScopeProcessor.Event.SET_DECLARATION_HOLDER, this);
if (lastParent == null) {
// Parent element should not see our vars
return true;
}
Pair<Set<String>, Set<String>> pair = buildMaps();
boolean conflict = pair == null;
final Set<String> classesSet = conflict ? null : pair.getFirst();
final Set<String> variablesSet = conflict ? null : pair.getSecond();
final NameHint hint = processor.getHint(NameHint.KEY);
if (hint != null && !conflict) {
final ElementClassHint elementClassHint = processor.getHint(ElementClassHint.KEY);
final String name = hint.getName(state);
if ((elementClassHint == null || elementClassHint.shouldProcess(ElementClassHint.DeclarationKind.CLASS)) && classesSet.contains(name)) {
return PsiScopesUtil.walkChildrenScopes(this, processor, state, lastParent, place);
}
if ((elementClassHint == null || elementClassHint.shouldProcess(ElementClassHint.DeclarationKind.VARIABLE)) && variablesSet.contains(name)) {
return PsiScopesUtil.walkChildrenScopes(this, processor, state, lastParent, place);
}
}
else {
return PsiScopesUtil.walkChildrenScopes(this, processor, state, lastParent, place);
}
return true;
}
@Override
public boolean shouldChangeModificationCount(PsiElement place) {
PsiElement parent = getParent();
return !(parent instanceof PsiMethod || parent instanceof PsiClassInitializer);
}
}