| /* |
| * [The "BSD licence"] |
| * Copyright (c) 2010 Ben Gruver |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| 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); |
| } |
| } |
| |
| /** |
| * Writes out a block of text that contains no newlines |
| */ |
| private void writeLine(char[] chars, int start, int len) throws IOException { |
| if (beginningOfLine && len > 0) { |
| writeIndent(); |
| beginningOfLine = false; |
| } |
| writer.write(chars, start, len); |
| } |
| |
| |
| /** |
| * Writes out a block of text that contains no newlines |
| */ |
| 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); |
| } |
| } |
| } |