/*
* Copyright 2013-2016 Sergey Ignatov, Alexander Zolotov, Florin Patan
*
* 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.goide.psi.impl;
import com.goide.psi.*;
import com.intellij.psi.PsiElement;
import com.intellij.psi.ResolveState;
import com.intellij.psi.util.PsiTreeUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Collection;
public class GoLabelReference extends GoCachedReference<GoLabelRef> {
private final GoScopeProcessorBase myProcessor = new GoScopeProcessorBase(myElement) {
@Override
protected boolean crossOff(@NotNull PsiElement e) {
return !(e instanceof GoLabelDefinition) || ((GoLabelDefinition)e).isBlank();
}
};
public GoLabelReference(@NotNull GoLabelRef element) {
super(element);
}
@NotNull
private Collection<GoLabelDefinition> getLabelDefinitions() {
GoFunctionLit functionLit = PsiTreeUtil.getParentOfType(myElement, GoFunctionLit.class);
PsiElement blockToSearch = functionLit != null ? functionLit.getBlock() : PsiTreeUtil.getTopmostParentOfType(myElement, GoBlock.class);
return PsiTreeUtil.findChildrenOfType(blockToSearch, GoLabelDefinition.class);
}
@Nullable
@Override
protected PsiElement resolveInner() {
return !processResolveVariants(myProcessor) ? myProcessor.getResult() : null;
}
@Override
public boolean processResolveVariants(@NotNull GoScopeProcessor processor) {
GoBreakStatement breakStatement = PsiTreeUtil.getParentOfType(myElement, GoBreakStatement.class);
if (breakStatement != null) {
return processDefinitionsForBreakReference(breakStatement, processor);
}
return processAllDefinitions(processor);
}
private boolean processAllDefinitions(@NotNull GoScopeProcessor processor) {
Collection<GoLabelDefinition> defs = getLabelDefinitions();
for (GoLabelDefinition def : defs) {
if (!processor.execute(def, ResolveState.initial())) {
return false;
}
}
return true;
}
private static boolean processDefinitionsForBreakReference(@NotNull GoBreakStatement breakStatement,
@NotNull GoScopeProcessor processor) {
PsiElement breakStatementOwner = GoPsiImplUtil.getBreakStatementOwner(breakStatement);
while (breakStatementOwner != null) {
PsiElement parent = breakStatementOwner.getParent();
if (parent instanceof GoLabeledStatement) {
if (!processor.execute(((GoLabeledStatement)parent).getLabelDefinition(), ResolveState.initial())) {
return false;
}
}
breakStatementOwner = GoPsiImplUtil.getBreakStatementOwner(breakStatementOwner);
}
return true;
}
}