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/*
* Copyright 2000-2014 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 org.jetbrains.java.decompiler.main;
import java.util.*;
/**
* Allows to connect text with resulting lines
*
* @author egor
*/
public class TextBuffer {
private final String myLineSeparator = DecompilerContext.getNewLineSeparator();
private final StringBuilder myStringBuilder;
private Map<Integer, Integer> myLineToOffsetMapping = null;
public TextBuffer() {
myStringBuilder = new StringBuilder();
}
public TextBuffer(int size) {
myStringBuilder = new StringBuilder(size);
}
public void setCurrentLine(int line) {
if (line >= 0) {
checkMapCreated();
myLineToOffsetMapping.put(line, myStringBuilder.length()+1);
}
}
public TextBuffer append(String str) {
myStringBuilder.append(str);
return this;
}
public TextBuffer append(char ch) {
myStringBuilder.append(ch);
return this;
}
public TextBuffer appendLineSeparator() {
myStringBuilder.append(myLineSeparator);
return this;
}
public void addBanner(String banner) {
myStringBuilder.insert(0, banner);
if (myLineToOffsetMapping != null) {
for (Integer line : myLineToOffsetMapping.keySet()) {
myLineToOffsetMapping.put(line, myLineToOffsetMapping.get(line) + banner.length());
}
}
}
@Override
public String toString() {
String original = myStringBuilder.toString();
if (myLineToOffsetMapping == null || myLineToOffsetMapping.isEmpty()) {
return original;
}
else {
StringBuilder res = new StringBuilder();
String[] srcLines = original.split(myLineSeparator);
int currentLineStartOffset = 0;
int currentLine = 0;
int previousMarkLine = 0;
int dumpedLines = 0;
ArrayList<Integer> linesWithMarks = new ArrayList<Integer>(myLineToOffsetMapping.keySet());
Collections.sort(linesWithMarks);
for (Integer markLine : linesWithMarks) {
Integer markOffset = myLineToOffsetMapping.get(markLine);
while (currentLine < srcLines.length) {
String line = srcLines[currentLine];
int lineEnd = currentLineStartOffset + line.length() + myLineSeparator.length();
if (markOffset >= currentLineStartOffset && markOffset <= lineEnd) {
int requiredLinesNumber = markLine - dumpedLines;
dumpedLines = markLine;
appendLines(res, srcLines, previousMarkLine, currentLine, requiredLinesNumber);
previousMarkLine = currentLine;
break;
}
currentLineStartOffset = lineEnd;
currentLine++;
}
}
if (previousMarkLine < srcLines.length) {
appendLines(res, srcLines, previousMarkLine, srcLines.length, srcLines.length - previousMarkLine);
}
return res.toString();
}
}
private void appendLines(StringBuilder res, String[] srcLines, int from, int to, int requiredLineNumber) {
if (to - from > requiredLineNumber) {
int separatorsRequired = to - from - requiredLineNumber - 1;
for (int i = from; i < to; i++) {
res.append(srcLines[i]);
if (separatorsRequired-- > 0) {
res.append(myLineSeparator);
}
}
res.append(myLineSeparator);
}
else if (to - from <= requiredLineNumber) {
for (int i = from; i < to; i++) {
res.append(srcLines[i]).append(myLineSeparator);
}
for (int i = 0; i < requiredLineNumber - to + from; i++) {
res.append(myLineSeparator);
}
}
}
public int length() {
return myStringBuilder.length();
}
public String substring(int start) {
return myStringBuilder.substring(start);
}
public void setLength(int position) {
myStringBuilder.setLength(position);
}
public void append(TextBuffer buffer) {
if (buffer.myLineToOffsetMapping != null && !buffer.myLineToOffsetMapping.isEmpty()) {
checkMapCreated();
for (Map.Entry<Integer, Integer> entry : buffer.myLineToOffsetMapping.entrySet()) {
myLineToOffsetMapping.put(entry.getKey(), entry.getValue() + myStringBuilder.length());
}
}
myStringBuilder.append(buffer.myStringBuilder);
}
private void checkMapCreated() {
if (myLineToOffsetMapping == null) {
myLineToOffsetMapping = new HashMap<Integer, Integer>();
}
}
public void insert(int offset, String s) {
if (myLineToOffsetMapping != null) {
throw new IllegalStateException("insert not yet supported with Line mapping");
}
myStringBuilder.insert(offset, s);
}
}
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