/*
* Copyright 2003-2015 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.assist;
import jetbrains.mps.nodeEditor.cells.EditorCell_ContextAssistantComponent;
import jetbrains.mps.nodeEditor.selection.SingularSelectionUtil;
import jetbrains.mps.openapi.editor.assist.ContextAssistant;
import jetbrains.mps.openapi.editor.cells.EditorCell;
import jetbrains.mps.openapi.editor.cells.EditorCell_Collection;
import jetbrains.mps.openapi.editor.selection.Selection;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
/**
* Looks for a context assistant placeholder cell in the subtree of the selected cell and its descendants which are not big cells (i.e. belong to the same node
* as the cell). If not successful, continues to the cell's ancestors and their subtrees.
*/
class AncestorOrSmallCellContextAssistantFinder implements ContextAssistantFinder {
@Nullable
@Override
public ContextAssistant findAssistant(@NotNull Selection selection) {
EditorCell cell = SingularSelectionUtil.getSingleSelectedCell(selection);
EditorCell last = null;
while (cell != null) {
ContextAssistant assistant = findAssistantInSubTree(cell, last);
if (assistant != null) {
return assistant;
}
last = cell;
cell = cell.getParent();
}
return null;
}
/**
* Looks for context assistant in the subtree of {@code root}, skipping big cells and {@code skipChild} (since it was checked earlier).
*/
@Nullable
private ContextAssistant findAssistantInSubTree(@NotNull EditorCell root, @Nullable EditorCell skipChild) {
if (root instanceof EditorCell_ContextAssistantComponent) {
return ((EditorCell_ContextAssistantComponent) root).getContextAssistant();
}
if (!(root instanceof EditorCell_Collection)) {
return null;
}
for (EditorCell child : ((EditorCell_Collection) root)) {
if (child == skipChild) {
continue;
}
if (child.isBig()) {
continue;
}
ContextAssistant assistant = findAssistantInSubTree(child, null);
if (assistant != null) {
return assistant;
}
}
return null;
}
}