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// Copyright Vespa.ai. 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.ArrayList;
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 {
/** Invariant: {@code size() >= 1}. An empty text buffer {@code => [""]} */
private final ArrayList<String> lines = new ArrayList<>();
private Version version = new Version();
TextBufferImpl() {
lines.add("");
}
TextBufferImpl(String text) {
this();
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 = new LinkedList<>(splitString(text, true, false));
if (linesToInsert.isEmpty()) {
return position;
}
// The position splits that line in two, and both prefix and suffix must be preserved
linesToInsert.set(0, getLinePrefix(position) + linesToInsert.get(0));
String lastLine = linesToInsert.get(linesToInsert.size() - 1);
int endColumnIndex = lastLine.length();
linesToInsert.set(linesToInsert.size() - 1, lastLine + getLineSuffix(position));
// Set the first line at lineIndex, insert the rest.
int lineIndex = position.lineIndex();
int endLineIndex = lineIndex + linesToInsert.size() - 1;
lines.set(lineIndex, linesToInsert.remove(0));
lines.addAll(lineIndex + 1, linesToInsert);
incrementVersion();
return new Position(endLineIndex, endColumnIndex);
}
@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) {
for (int fromIndex = endIndex, 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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