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/*
* Copyright 2011 Vaadin Ltd.
*
* 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 com.vaadin.sass.visitor;
import java.util.ArrayList;
import java.util.HashMap;
import com.vaadin.sass.ScssStylesheet;
import com.vaadin.sass.tree.BlockNode;
import com.vaadin.sass.tree.Node;
/**
* Handle nesting of blocks by moving child blocks to their parent, updating
* their selector lists while doing so. Also parent selectors (&) are
* handled here.
*
* Sample SASS code (from www.sass-lang.com):
*
* <pre>
* table.hl {
* margin: 2em 0;
* td.ln {
* text-align: right;
* }
* }
* </pre>
*
* Note that nested properties are handled by {@link NestedNodeHandler}, not
* here.
*/
public class BlockNodeHandler {
public static void traverse(BlockNode node) {
Node parent = node.getParentNode();
if (node.getChildren().size() == 0) {
parent.removeChild(node);
while (parent != null && parent instanceof BlockNode
&& parent.getChildren().size() == 0) {
Node temp = parent;
parent = parent.getParentNode();
parent.removeChild(temp);
}
return;
}
if (parent instanceof BlockNode) {
combineParentSelectorListToChild(node);
}
}
private static void combineParentSelectorListToChild(BlockNode node) {
ArrayList<String> newList = new ArrayList<String>();
BlockNode parentBlock = (BlockNode) node.getParentNode();
for (String parentSelector : parentBlock.getSelectorList()) {
for (String childSelector : node.getSelectorList()) {
// handle parent selector
if (childSelector.contains("&")) {
newList.add(childSelector.replace("&", parentSelector));
} else {
newList.add(parentSelector + " " + childSelector);
}
}
}
node.setSelectorList(newList);
Node oldParent = node.getParentNode();
HashMap<Node, Node> lastNodeAdded = ScssStylesheet.getLastNodeAdded();
if (lastNodeAdded.get(oldParent) != null) {
oldParent.getParentNode().appendChild(node,
lastNodeAdded.get(oldParent));
} else {
oldParent.getParentNode().appendChild(node, oldParent);
}
lastNodeAdded.put(oldParent, node);
}
}
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