/*
* Copyright 2012-2014 Sergey Ignatov
*
* 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.erlang.editor;
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.psi.PsiElement;
import com.intellij.psi.search.PsiElementProcessor;
import com.intellij.psi.tree.IElementType;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.containers.ContainerUtil;
import org.intellij.erlang.ErlangParserDefinition;
import org.intellij.erlang.psi.ErlangFile;
import org.intellij.erlang.psi.ErlangFunction;
import org.intellij.erlang.psi.impl.ErlangPsiImplUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.List;
public class ErlangFoldingBuilder extends FoldingBuilderEx implements DumbAware {
@NotNull
@Override
public FoldingDescriptor[] buildFoldRegions(@NotNull PsiElement root, @NotNull Document document, boolean quick) {
if (!(root instanceof ErlangFile)) return FoldingDescriptor.EMPTY;
ErlangFile file = (ErlangFile) root;
final List<FoldingDescriptor> result = ContainerUtil.newArrayList();
for (ErlangFunction function : file.getFunctions()) {
result.add(new FoldingDescriptor(function, function.getTextRange()));
}
if (!quick) {
PsiTreeUtil.processElements(file, new PsiElementProcessor() {
@Override
public boolean execute(@NotNull PsiElement element) {
if (ErlangParserDefinition.COMMENTS.contains(element.getNode().getElementType()) && element.getTextRange().getLength() > 2) {
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 ErlangFunction) return ErlangPsiImplUtil.createFunctionPresentation((ErlangFunction) psi) + " -> ...";
IElementType type = node.getElementType();
if (ErlangParserDefinition.ERL_COMMENT == type) return "% ...";
if (ErlangParserDefinition.ERL_FUNCTION_DOC_COMMENT == type) return "%% ...";
if (ErlangParserDefinition.ERL_MODULE_DOC_COMMENT == type) return "%%% ...";
return null;
}
@Override
public boolean isCollapsedByDefault(@NotNull ASTNode node) {
return false;
}
}