package org.jf.util;
import java.io.IOException;
import java.io.Writer;
public class IndentingWriter extends Writer {
protected final Writer writer;
protected final char[] buffer = new char[24];
protected int indentLevel = 0;
private boolean beginningOfLine = true;
private static final String newLine = System.getProperty("line.separator");
public IndentingWriter(Writer writer) {
this.writer = writer;
}
protected void writeIndent() throws IOException {
for (int i=0; i<indentLevel; i++) {
writer.write(' ');
}
}
@Override
public void write(int chr) throws IOException {
if (chr == '\n') {
writer.write(newLine);
beginningOfLine = true;
} else {
if (beginningOfLine) {
writeIndent();
}
beginningOfLine = false;
writer.write(chr);
}
}
private void writeLine(char[] chars, int start, int len) throws IOException {
if (beginningOfLine && len > 0) {
writeIndent();
beginningOfLine = false;
}
writer.write(chars, start, len);
}
private void writeLine(String str, int start, int len) throws IOException {
if (beginningOfLine && len > 0) {
writeIndent();
beginningOfLine = false;
}
writer.write(str, start, len);
}
@Override
public void write(char[] chars) throws IOException {
write(chars, 0, chars.length);
}
@Override
public void write(char[] chars, int start, int len) throws IOException {
final int end = start+len;
int pos = start;
while (pos < end) {
if (chars[pos] == '\n') {
writeLine(chars, start, pos-start);
writer.write(newLine);
beginningOfLine = true;
pos++;
start = pos;
} else {
pos++;
}
}
writeLine(chars, start, pos-start);
}
@Override
public void write(String s) throws IOException {
write(s, 0, s.length());
}
@Override
public void write(String str, int start, int len) throws IOException {
final int end = start+len;
int pos = start;
while (pos < end) {
pos = str.indexOf('\n', start);
if (pos == -1 || pos >= end) {
writeLine(str, start, end-start);
return;
} else {
writeLine(str, start, pos-start);
writer.write(newLine);
beginningOfLine = true;
start = pos+1;
}
}
}
@Override
public Writer append(CharSequence charSequence) throws IOException {
write(charSequence.toString());
return this;
}
@Override
public Writer append(CharSequence charSequence, int start, int len) throws IOException {
write(charSequence.subSequence(start, len).toString());
return this;
}
@Override
public Writer append(char c) throws IOException {
write(c);
return this;
}
@Override
public void flush() throws IOException {
writer.flush();
}
@Override
public void close() throws IOException {
writer.close();
}
public void indent(int indentAmount) {
this.indentLevel += indentAmount;
if (indentLevel < 0) {
indentLevel = 0;
}
}
public void deindent(int indentAmount) {
this.indentLevel -= indentAmount;
if (indentLevel < 0) {
indentLevel = 0;
}
}
public void printUnsignedLongAsHex(long value) throws IOException {
int bufferIndex = 23;
do {
int digit = (int)(value & 15);
if (digit < 10) {
buffer[bufferIndex--] = (char)(digit + '0');
} else {
buffer[bufferIndex--] = (char)((digit - 10) + 'a');
}
value >>>= 4;
} while (value != 0);
bufferIndex++;
writeLine(buffer, bufferIndex, 24-bufferIndex);
}
public void printSignedLongAsDec(long value) throws IOException {
int bufferIndex = 23;
if (value < 0) {
value *= -1;
write('-');
}
do {
long digit = value % 10;
buffer[bufferIndex--] = (char)(digit + '0');
value = value / 10;
} while (value != 0);
bufferIndex++;
writeLine(buffer, bufferIndex, 24-bufferIndex);
}
public void printSignedIntAsDec(int value) throws IOException {
int bufferIndex = 15;
if (value < 0) {
value *= -1;
write('-');
}
do {
int digit = value % 10;
buffer[bufferIndex--] = (char)(digit + '0');
value = value / 10;
} while (value != 0);
bufferIndex++;
writeLine(buffer, bufferIndex, 16-bufferIndex);
}
public void printUnsignedIntAsDec(int value) throws IOException {
int bufferIndex = 15;
if (value < 0) {
printSignedLongAsDec(value & 0xFFFFFFFFL);
} else {
printSignedIntAsDec(value);
}
}
}