/*
* Copyright 2011-2014 Gregory Shrago
*
* 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 org.intellij.grammar;
import com.intellij.lang.ASTNode;
import com.intellij.lang.folding.FoldingBuilderEx;
import com.intellij.lang.folding.FoldingDescriptor;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.util.TextRange;
import com.intellij.psi.PsiElement;
import com.intellij.psi.search.PsiElementProcessor;
import com.intellij.psi.util.PsiTreeUtil;
import org.intellij.grammar.psi.BnfAttrs;
import org.intellij.grammar.psi.BnfFile;
import org.intellij.grammar.psi.BnfRule;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.ArrayList;
/**
* @author gregsh
*/
public class BnfFoldingBuilder extends FoldingBuilderEx implements DumbAware {
@NotNull
@Override
public FoldingDescriptor[] buildFoldRegions(@NotNull PsiElement root, @NotNull Document document, boolean quick) {
if (!(root instanceof BnfFile)) return FoldingDescriptor.EMPTY;
BnfFile file = (BnfFile)root;
final ArrayList<FoldingDescriptor> result = new ArrayList<FoldingDescriptor>();
for (BnfAttrs attrs : file.getAttributes()) {
TextRange textRange = attrs.getTextRange();
if (textRange.getLength() <= 2) continue;
result.add(new FoldingDescriptor(attrs, textRange));
}
for (BnfRule rule : file.getRules()) {
//result.add(new FoldingDescriptor(rule, rule.getTextRange()));
BnfAttrs attrs = rule.getAttrs();
if (attrs != null) {
result.add(new FoldingDescriptor(attrs, attrs.getTextRange()));
}
}
if (!quick) {
PsiTreeUtil.processElements(file, new PsiElementProcessor() {
@Override
public boolean execute(@NotNull PsiElement element) {
if (element.getNode().getElementType() == BnfParserDefinition.BNF_BLOCK_COMMENT) {
result.add(new FoldingDescriptor(element, element.getTextRange()));
}
return true;
}
});
}
return result.toArray(new FoldingDescriptor[result.size()]);
}
@Nullable
@Override
public String getPlaceholderText(@NotNull ASTNode node) {
PsiElement psi = node.getPsi();
if (psi instanceof BnfAttrs) return "{..}";
if (psi instanceof BnfRule) return ((BnfRule)psi).getName() + " ::= ...";
if (node.getElementType() == BnfParserDefinition.BNF_BLOCK_COMMENT) return "/*..*/";
return null;
}
@Override
public boolean isCollapsedByDefault(@NotNull ASTNode node) {
PsiElement psi = node.getPsi();
return psi instanceof BnfAttrs && !(psi.getParent() instanceof BnfRule);
}
}