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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.task.util.editor;
import java.util.LinkedList;
import java.util.List;
import static com.yahoo.vespa.hosted.node.admin.task.util.editor.TextUtil.splitString;
/**
* @author hakon
*/
public class TextBufferImpl implements TextBuffer {
private final LinkedList<String> lines = new LinkedList<>();
private Version version = new Version();
TextBufferImpl() {
// Invariant about always size() >= 0, and an empty text buffer => [""]
lines.add("");
}
TextBufferImpl(String text) {
lines.add("");
write(getStartOfText(), text);
// reset version
version = new Version();
}
@Override
public Version getVersion() {
return version;
}
@Override
public String getString() {
return String.join("\n", lines);
}
@Override
public int getMaxLineIndex() {
return lines.size() - 1;
}
@Override
public String getLine(int lineIndex) {
return lines.get(lineIndex);
}
@Override
public Position write(Position position, String text) {
List<String> linesToInsert = splitString(text, true, false);
if (linesToInsert.isEmpty()) {
return position;
}
int lineIndex = position.lineIndex();
String prefix = getLinePrefix(position);
linesToInsert.set(0, prefix + linesToInsert.get(0));
// Insert the current prefix to the first line
int numberOfLinesToInsert = linesToInsert.size() - 1; // 1 will be set, the rest inserted
String prefixOfCursorAfterwards = linesToInsert.get(numberOfLinesToInsert);
// Append the current suffix to the last line
String suffix = getLineSuffix(position);
String lastLine = prefixOfCursorAfterwards + suffix;
linesToInsert.set(numberOfLinesToInsert, lastLine);
// The first line is overwritten with set()
lines.set(lineIndex, linesToInsert.remove(0));
// The following lines must be inserted
lines.addAll(lineIndex + 1, linesToInsert);
incrementVersion();
return new Position(lineIndex + linesToInsert.size(), prefixOfCursorAfterwards.length());
}
@Override
public void clear() {
lines.clear();
lines.add("");
}
@Override
public void delete(Position start, Position end) {
if (start.isAfter(end)) {
throw new IllegalArgumentException("start position " + start +
" is after end position " + end);
}
String prefix = getLinePrefix(start);
String suffix = getLineSuffix(end);
String stichedLine = prefix + suffix;
lines.set(start.lineIndex(), stichedLine);
deleteLines(start.lineIndex() + 1, end.lineIndex() + 1);
incrementVersion();
}
private void deleteLines(int startIndex, int endIndex) {
int fromIndex = endIndex;
for (int toIndex = startIndex; fromIndex <= getMaxLineIndex(); ++toIndex, ++fromIndex) {
lines.set(toIndex, lines.get(fromIndex));
}
truncate(getMaxLineIndex() - (endIndex - startIndex));
}
private void truncate(int newMaxLineIndex) {
while (getMaxLineIndex() > newMaxLineIndex) {
lines.remove(getMaxLineIndex());
}
}
private void incrementVersion() {
version = version.next();
}
}
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