/*
* Copyright 2000-2013 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.scope.util;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.progress.ProgressIndicatorProvider;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiInvalidElementAccessException;
import com.intellij.psi.ResolveState;
import com.intellij.psi.scope.PsiScopeProcessor;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* Some base methods for scopes
*/
public class PsiScopesUtilCore {
public static final Logger LOGGER = Logger.getInstance(PsiScopesUtilCore.class);
public static boolean treeWalkUp(@NotNull PsiScopeProcessor processor, @NotNull PsiElement entrance, @Nullable PsiElement maxScope) {
return treeWalkUp(processor, entrance, maxScope, ResolveState.initial());
}
public static boolean treeWalkUp(@NotNull final PsiScopeProcessor processor,
@NotNull final PsiElement entrance,
@Nullable final PsiElement maxScope,
@NotNull final ResolveState state) {
if (!entrance.isValid()) {
LOGGER.error(new PsiInvalidElementAccessException(entrance));
}
PsiElement prevParent = entrance;
PsiElement scope = entrance;
while (scope != null) {
ProgressIndicatorProvider.checkCanceled();
if (!scope.processDeclarations(processor, state, prevParent, entrance)) {
return false; // resolved
}
if (scope == maxScope) break;
prevParent = scope;
scope = prevParent.getContext();
if (scope != null && scope != prevParent.getParent() && !scope.isValid()) {
break;
}
}
return true;
}
public static boolean walkChildrenScopes(@NotNull PsiElement thisElement,
@NotNull PsiScopeProcessor processor,
@NotNull ResolveState state,
PsiElement lastParent,
PsiElement place) {
PsiElement child = null;
if (lastParent != null && lastParent.getParent() == thisElement) {
child = lastParent.getPrevSibling();
if (child == null) return true; // first element
}
if (child == null) {
child = thisElement.getLastChild();
}
while (child != null) {
if (!child.processDeclarations(processor, state, null, place)) return false;
child = child.getPrevSibling();
}
return true;
}
}