/*
* Copyright 2003-2014 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 jetbrains.mps.generator.impl;
import jetbrains.mps.generator.runtime.TemplateReductionRule;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.mps.openapi.model.SNode;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;
/**
* Evgeny Gryaznov, Apr 14, 2010
*/
public class ReductionContext {
private final ReductionContext myParent;
private final SNode myInputNode;
private final TemplateReductionRule myReductionRule;
ReductionContext() {
myParent = null;
myInputNode = null;
myReductionRule = null;
}
ReductionContext(@NotNull ReductionContext parent, @NotNull SNode inputNode, @NotNull TemplateReductionRule reductionRule) {
myParent = parent;
myInputNode = inputNode;
myReductionRule = reductionRule;
}
boolean isBlocked(SNode inputNode, TemplateReductionRule rule) {
for (ReductionContext current = this; current != null; current = current.myParent) {
if (current.myInputNode == inputNode && current.myReductionRule == rule) {
return true;
}
}
return false;
}
Object getBlockedRules(SNode inputNode) {
ArrayList<TemplateReductionRule> matchingRules = new ArrayList<TemplateReductionRule>();
for (ReductionContext current = this; current != null; current = current.myParent) {
if (current.myInputNode == inputNode && current.myReductionRule != null) {
matchingRules.add(current.myReductionRule);
}
}
if (matchingRules.isEmpty()) {
return null;
} else {
return new HashSet<TemplateReductionRule>(matchingRules);
}
}
static Object combineRuleSets(Object set1, Object set2) {
if (set1 == null)
return set2;
if (set2 == null)
return set1;
if (set1 instanceof TemplateReductionRule) {
if (set2 instanceof TemplateReductionRule) {
Set<Object> set = new HashSet<Object>(2);
set.add(set1);
set.add(set2);
return set;
} else {
Set<Object> set = new HashSet<Object>(((Set) set2).size() + 1);
set.addAll((Set) set2);
set.add(set1);
return set;
}
} else {
if (set2 instanceof TemplateReductionRule) {
Set<Object> set = new HashSet<Object>(((Set) set1).size() + 1);
set.addAll((Set) set1);
set.add(set2);
return set;
} else {
Set<Object> set = new HashSet<Object>(((Set) set2).size() + ((Set) set1).size());
set.addAll((Set) set1);
set.addAll((Set) set2);
return set;
}
}
}
}