/*
* 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.nodeEditor.cells.EditorCell_Label;
import jetbrains.mps.openapi.editor.cells.CellTraversalUtil;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
public class BracesFinder {
private static final Algorithm[] ALGORITHMS = new Algorithm[] { new MatchingLabelBracesFinder(), new CollectionBracesFinder() };
@Nullable
public static BracePair findBracesToHighlight(@NotNull EditorCell anchor) {
BracePair bracePair = findUsingAlgorithms(anchor);
if (bracePair != null) return bracePair;
EditorCell alternativeAnchor = getAlternativeAnchor(anchor);
if (alternativeAnchor == null) {
return null;
}
return findUsingAlgorithms(alternativeAnchor);
}
@Nullable
private static BracePair findUsingAlgorithms(@NotNull EditorCell cell) {
for (Algorithm algorithm : ALGORITHMS) {
BracePair bracePair = algorithm.find(cell);
if (bracePair != null) {
return bracePair;
}
}
return null;
}
@Nullable
private static EditorCell getAlternativeAnchor(@NotNull EditorCell newSelection) {
if (!(newSelection instanceof EditorCell_Label)) {
return null;
}
EditorCell_Label editorCell = (EditorCell_Label) newSelection;
if (editorCell.getCaretPosition() == 0) {
EditorCell cell = CellTraversalUtil.getPrevLeaf(editorCell);
if (cell instanceof EditorCell_Label) {
EditorCell_Label label = (EditorCell_Label) cell;
if (label.getWidth() == 0 && editorCell.getLeftInset() == 0) {
return label;
}
}
}
if (editorCell.getCaretPosition() == editorCell.getText().length()) {
EditorCell cell = CellTraversalUtil.getNextLeaf(editorCell);
if (cell instanceof EditorCell_Label) {
EditorCell_Label label = (EditorCell_Label) cell;
if (label.getWidth() == 0 && editorCell.getRightInset() == 0) {
return label;
}
}
}
return null;
}
interface Algorithm {
@Nullable
BracePair find(@NotNull EditorCell selectedCell);
}
}