| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.royale.compiler.internal.targets; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.royale.compiler.exceptions.CircularDependencyException; |
| import org.apache.royale.compiler.internal.graph.Graph; |
| import org.apache.royale.compiler.internal.graph.GraphEdge; |
| import org.apache.royale.compiler.internal.graph.TopologicalSort; |
| import org.apache.royale.compiler.internal.graph.TopologicalSort.IVisitor; |
| import org.apache.royale.swf.io.SWFReader; |
| import org.apache.royale.swf.tags.ICharacterReferrer; |
| import org.apache.royale.swf.tags.ICharacterTag; |
| import org.apache.royale.swf.tags.ITag; |
| |
| /** |
| * This is an utility class that can sort tags in topological order. This is especially useful |
| * for {@link ICharacterReferrer} tags because the sorting will guarantee that the tags are in |
| * an order where referred tags appear before the referrer. |
| * |
| * This ordering mimics the ordering in the 4.5.1 Flex Compiler for Native SWF Tags. |
| * |
| * Please note that only {@link ICharacterTag} will have a stable ordering in addition to the |
| * topological ordering (it will be based on their character IDs). Other tags will be sorted by |
| * their toString functions, which may changed on execution. |
| */ |
| public class TagSorter |
| { |
| private static class TagGraphVisitor implements IVisitor<ITag, GraphEdge<ITag>> |
| { |
| private List<ITag> orderedList; |
| private Map<ITag, Integer> tagOrdering; |
| |
| public TagGraphVisitor (List<ITag> orderedList, Map<ITag, Integer> tagOrdering) |
| { |
| this.orderedList = orderedList; |
| this.tagOrdering = tagOrdering; |
| } |
| |
| @Override |
| public int compare(ITag tag1, ITag tag2) |
| { |
| return tagOrdering.get(tag1) - tagOrdering.get(tag2); |
| } |
| |
| @Override |
| public void visit(ITag v) |
| { |
| orderedList.add(v); |
| } |
| |
| /** |
| * All ITag edges are Topological |
| */ |
| @Override |
| public boolean isTopologicalEdge(GraphEdge<ITag> e) |
| { |
| return true; |
| } |
| |
| public List<ITag> getOrderedList() |
| { |
| return orderedList; |
| } |
| } |
| |
| /** |
| * Adds tag and all referred {@link ITag} to a Graph |
| * @param tagGraph |
| * @param tag |
| */ |
| private static void walkTags(Graph<ITag, GraphEdge<ITag>> tagGraph, ITag tag, Map<ITag, Integer> ordering) |
| { |
| if (tagGraph.addVertex(tag)) |
| { |
| if (tag instanceof ICharacterReferrer) |
| { |
| for (ITag childTag : ((ICharacterReferrer)tag).getReferences()) |
| { |
| if (childTag == SWFReader.INVALID_TAG) |
| continue; |
| |
| walkTags(tagGraph, childTag, ordering); |
| tagGraph.setEdge(new GraphEdge<ITag>(tag, childTag)); |
| } |
| } |
| } |
| |
| if (!ordering.containsKey(tag)) |
| { |
| ordering.put(tag, ordering.keySet().size()); |
| } |
| } |
| |
| /** |
| * Sorts the rootedTags topologically. It is assumed that rootedTags are |
| * nodes of a DAG (no circular {@link ICharacterReferrer}) |
| * |
| * This algorithm will break ties based on depth first ordering of the getReferences() |
| * function of {@link ICharacterReferrer} |
| * |
| * @param rootedTags An initial list of tags considered as "root" tags. |
| * @return A list sorted in topological order containing the reachable tags from rootedTags |
| */ |
| public static List<ITag> sortFullGraph(List<ITag> rootedTags) |
| { |
| Graph<ITag, GraphEdge<ITag>> tagGraph = new Graph<ITag, GraphEdge<ITag>>(); |
| |
| Map<ITag, Integer> tagOrder = new HashMap<ITag, Integer>(); |
| |
| //add extra referred tags if needed |
| for (ITag rootedTag : rootedTags) |
| { |
| walkTags(tagGraph, rootedTag, tagOrder); |
| } |
| |
| List<ITag> orderedList = new ArrayList<ITag>(); |
| |
| TagGraphVisitor visitor = new TagGraphVisitor(orderedList, tagOrder); |
| |
| try |
| { |
| TopologicalSort.sort(tagGraph, rootedTags, visitor); |
| } |
| catch (CircularDependencyException e) |
| { |
| //This should never happen as tags should not refer to themselves. |
| assert false : "CircularDependencyException"; |
| } |
| |
| return visitor.getOrderedList(); |
| } |
| } |