// Copyright (C) 2011 The Android Open Source Project
//
// 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 gerrit;
import com.google.gerrit.rules.StoredValues;
import com.google.gerrit.server.patch.PatchList;
import com.google.gerrit.server.patch.PatchListEntry;
import com.google.gerrit.server.patch.Text;
import com.googlecode.prolog_cafe.lang.IllegalTypeException;
import com.googlecode.prolog_cafe.lang.JavaException;
import com.googlecode.prolog_cafe.lang.Operation;
import com.googlecode.prolog_cafe.lang.PInstantiationException;
import com.googlecode.prolog_cafe.lang.Predicate;
import com.googlecode.prolog_cafe.lang.Prolog;
import com.googlecode.prolog_cafe.lang.PrologException;
import com.googlecode.prolog_cafe.lang.Term;
import org.eclipse.jgit.diff.Edit;
import org.eclipse.jgit.errors.CorruptObjectException;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTree;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.jgit.treewalk.TreeWalk;
import java.io.IOException;
import java.util.List;
import java.util.regex.Pattern;
/**
* Returns true if any of the files that match FileNameRegex have edited lines
* that match EditRegex
*
* <pre>
* 'commit_edits'(+FileNameRegex, +EditRegex)
* </pre>
*/
public class PRED_commit_edits_2 extends Predicate.P2 {
private static final long serialVersionUID = 1L;
public PRED_commit_edits_2(Term a1, Term a2, Operation n) {
arg1 = a1;
arg2 = a2;
cont = n;
}
@Override
public Operation exec(Prolog engine) throws PrologException {
engine.setB0();
Term a1 = arg1.dereference();
Term a2 = arg2.dereference();
Pattern fileRegex = getRegexParameter(a1);
Pattern editRegex = getRegexParameter(a2);
PatchList pl = StoredValues.PATCH_LIST.get(engine);
Repository repo = StoredValues.REPOSITORY.get(engine);
final ObjectReader reader = repo.newObjectReader();
final RevTree aTree;
final RevTree bTree;
try {
final RevWalk rw = new RevWalk(reader);
final RevCommit bCommit = rw.parseCommit(pl.getNewId());
if (pl.getOldId() != null) {
aTree = rw.parseTree(pl.getOldId());
} else {
// Octopus merge with unknown automatic merge result, since the
// web UI returns no files to match against, just fail.
return engine.fail();
}
bTree = bCommit.getTree();
for (PatchListEntry entry : pl.getPatches()) {
String newName = entry.getNewName();
String oldName = entry.getOldName();
if (newName.equals("/COMMIT_MSG")) {
continue;
}
if (fileRegex.matcher(newName).find() ||
(oldName != null && fileRegex.matcher(oldName).find())) {
List<Edit> edits = entry.getEdits();
if (edits.isEmpty()) {
continue;
}
Text tA;
if (oldName != null) {
tA = load(aTree, oldName, reader);
} else {
tA = load(aTree, newName, reader);
}
Text tB = load(bTree, newName, reader);
for (Edit edit : edits) {
if (tA != Text.EMPTY) {
String aDiff = tA.getString(edit.getBeginA(), edit.getEndA(), true);
if (editRegex.matcher(aDiff).find()) {
return cont;
}
}
if (tB != Text.EMPTY) {
String bDiff = tB.getString(edit.getBeginB(), edit.getEndB(), true);
if (editRegex.matcher(bDiff).find()) {
return cont;
}
}
}
}
}
} catch (IOException err) {
throw new JavaException(this, 1, err);
} finally {
reader.release();
}
return engine.fail();
}
private Pattern getRegexParameter(Term term) {
if (term.isVariable()) {
throw new PInstantiationException(this, 1);
}
if (!term.isSymbol()) {
throw new IllegalTypeException(this, 1, "symbol", term);
}
return Pattern.compile(term.name(), Pattern.MULTILINE);
}
private Text load(final ObjectId tree, final String path, final ObjectReader reader)
throws MissingObjectException, IncorrectObjectTypeException,
CorruptObjectException, IOException {
if (path == null) {
return Text.EMPTY;
}
final TreeWalk tw = TreeWalk.forPath(reader, path, tree);
if (tw == null) {
return Text.EMPTY;
}
if (tw.getFileMode(0).getObjectType() != Constants.OBJ_BLOB) {
return Text.EMPTY;
}
return new Text(reader.open(tw.getObjectId(0), Constants.OBJ_BLOB));
}
}