/*
* Copyright 2003-2016 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.nodeEditor.braces;
import jetbrains.mps.editor.runtime.style.StyleAttributes;
import jetbrains.mps.nodeEditor.braces.BracesFinder.Algorithm;
import jetbrains.mps.nodeEditor.cells.CellFinderUtil;
import jetbrains.mps.openapi.editor.cells.CellTraversalUtil;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import jetbrains.mps.util.Pair;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.model.SNode;
class MatchingLabelBracesFinder implements Algorithm {
@Nullable
@Override
public BracePair find(@NotNull EditorCell selectedCell) {
final Pair<EditorCell, String> matchingLabelAndCell = getMatchingLabelAndCell(selectedCell);
if (matchingLabelAndCell == null) {
return null;
}
final EditorCell matchingCell = matchingLabelAndCell.o1;
EditorCell bigCell = CellTraversalUtil.getContainingBigCell(selectedCell);
EditorCell editorCell = CellFinderUtil.findChildByCondition(bigCell, cell -> isMatchingLabelAndCell(matchingLabelAndCell, cell), true);
return editorCell != null ? new BracePair(editorCell, matchingCell) : null;
}
private Pair<EditorCell, String> getMatchingLabelAndCell(EditorCell editorCell) {
SNode node = editorCell.getSNode();
while (editorCell != null && editorCell.getSNode() == node) {
if (editorCell.getStyle().get(StyleAttributes.MATCHING_LABEL) != null) {
return new Pair<>(editorCell, editorCell.getStyle().get(StyleAttributes.MATCHING_LABEL));
}
editorCell = editorCell.getParent();
}
return null;
}
private boolean isMatchingLabelAndCell(Pair<EditorCell, String> matchingLabelAndCell, EditorCell cell) {
EditorCell matchingCell = matchingLabelAndCell.o1;
return cell != matchingCell
&& cell.getSNode() == matchingCell.getSNode()
&& matchingLabelAndCell.o2.equals(cell.getStyle().get(StyleAttributes.MATCHING_LABEL));
}
}