/*
* 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.smodel.persistence.def.v9;
import jetbrains.mps.extapi.model.GeneratableSModel;
import jetbrains.mps.generator.ModelDigestUtil;
import jetbrains.mps.smodel.persistence.def.IHashProvider;
import jetbrains.mps.smodel.persistence.def.XmlFastScanner;
import jetbrains.mps.smodel.persistence.def.v9.IdEncoder.EncodingException;
import org.jetbrains.mps.openapi.model.SNodeId;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class HashProvider9 extends IHashProvider {
@Override
public String getHash(String content) {
return ModelDigestUtil.hashText(content);
}
@Override
public Map<String, String> getRootHashes(String content) {
Map<String, String> result = new HashMap<String, String>();
extractRootHashes(content, result);
return result;
}
private static void extractRootHashes(String content, Map<String, String> rootHashes) {
XmlFastScanner scanner = new XmlFastScanner(content.toCharArray());
int token, nodeStart = -1, nodeEnd = -1;
String rootId = null;
// { mandatory space} id {optional space} = {optional space} "{value}"
final Matcher nodeIdMatcher = Pattern.compile("\\sid\\s*=\\s*\"([^\"]+)\"").matcher("");
final IdEncoder idEncoder = new IdEncoder();
boolean nodeElementFound = false;
while ((token = scanner.next()) != XmlFastScanner.EOI) {
if (token != XmlFastScanner.OPEN_TAG && token != XmlFastScanner.SIMPLE_TAG && token != XmlFastScanner.CLOSE_TAG) {
continue;
}
if (scanner.tagDepth() != 1 || !"node".equals(scanner.getName())) {
continue;
}
switch (token) {
case XmlFastScanner.SIMPLE_TAG:
nodeEnd = scanner.getOffset();
// fall-through
case XmlFastScanner.OPEN_TAG:
nodeEnd = -1; // just in case due to corrupt file (e.g. merge) closing tag comes first.
nodeStart = scanner.getTokenOffset();
if (nodeIdMatcher.reset(scanner.token()).find()) {
rootId = nodeIdMatcher.group(1);
} else {
rootId = null;
}
if (rootId != null && !nodeElementFound) {
rootHashes.put(GeneratableSModel.HEADER, ModelDigestUtil.hashText(scanner.getText(0, nodeStart)));
nodeElementFound = true;
}
break;
case XmlFastScanner.CLOSE_TAG:
nodeEnd = scanner.getOffset();
break;
}
if (rootId != null && nodeStart != -1 && nodeEnd != -1) {
assert nodeStart <= nodeEnd;
String s = scanner.getText(nodeStart, nodeEnd);
SNodeId nodeId = null;
try {
nodeId = idEncoder.parseNodeId(rootId);
} catch (EncodingException e) {
throw new IllegalArgumentException(e);
}
// presentation of node id in persistence is different from what customers use (SNodeId.toString).
// However, it's bad idea to have map<string,string> here, and shall get refactored.
rootHashes.put(nodeId.toString(), ModelDigestUtil.hashText(s));
nodeStart = nodeEnd = -1;
rootId = null;
}
}
if (!nodeElementFound) {
rootHashes.put(GeneratableSModel.HEADER, ModelDigestUtil.hashText(content));
}
}
}