/*
* Copyright 2000-2010 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 com.intellij.openapi.diff;
import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.text.StringUtil;
import org.jetbrains.annotations.NotNull;
import java.util.Iterator;
public class DiffNavigationContext {
private final String myTargetString;
private final Iterable<String> myPreviousLinesIterable;
public DiffNavigationContext(@NotNull Iterable<String> previousLinesIterable, @NotNull String targetString) {
myPreviousLinesIterable = previousLinesIterable;
myTargetString = targetString;
}
public Iterable<String> getPreviousLinesIterable() {
return myPreviousLinesIterable;
}
public String getTargetString() {
return myTargetString;
}
public int contextMatchCheck(@NotNull Iterator<Pair<Integer, CharSequence>> changedLinesIterator) {
// we ignore spaces.. at least at start/end, since some version controls could ignore their changes when doing annotate
Iterator<? extends CharSequence> iterator = getPreviousLinesIterable().iterator();
if (iterator.hasNext()) {
CharSequence contextLine = iterator.next();
while (changedLinesIterator.hasNext()) {
Pair<Integer, ? extends CharSequence> pair = changedLinesIterator.next();
if (StringUtil.equalsTrimWhitespaces(pair.getSecond(), contextLine)) {
if (!iterator.hasNext()) break;
contextLine = iterator.next();
}
}
}
if (iterator.hasNext()) return -1;
if (!changedLinesIterator.hasNext()) return -1;
while (changedLinesIterator.hasNext()) {
Pair<Integer, ? extends CharSequence> pair = changedLinesIterator.next();
if (StringUtil.equalsTrimWhitespaces(pair.getSecond(), getTargetString())) {
return pair.getFirst();
}
}
return -1;
}
}