How to use

AbstractCodeWriter$TrimTrailingSpaceWriter

in

com.oracle.truffle.dsl.processor.java.transform

@Override
public void write(char[] cbuf, int off, int len) throws IOException {
  buffer.append(cbuf, off, len);
  int newLinePoint = buffer.indexOf(LN);
  if (newLinePoint != -1) {
    String lhs = trimTrailing(buffer.substring(0, newLinePoint));
    delegate.write(lhs);
    delegate.write(LN);
    buffer.delete(0, newLinePoint + 1);
  }
}

try {
  imports = OrganizedImports.organize(e);
  w = new TrimTrailingSpaceWriter(createWriter(e));
  writer = w;
  writeRootClass(e);

@Override
public Void visitType(CodeTypeElement e, Void p) {
  if (e.isTopLevelClass()) {
    Writer w = null;
    try {
      imports = OrganizedImports.organize(e);
      w = new TrimTrailingSpaceWriter(createWriter(e));
      writer = w;
      writeRootClass(e);
    } catch (IOException ex) {
      throw new RuntimeException(ex);
    } finally {
      if (w != null) {
        try {
          w.close();
        } catch (Throwable e1) {
          // see eclipse bug https://bugs.eclipse.org/bugs/show_bug.cgi?id=361378
          // TODO temporary suppress errors on close.
        }
      }
      writer = null;
    }
  } else {
    writeClassImpl(e);
  }
  return null;
}

@Override
public void write(char[] cbuf, int off, int len) throws IOException {
  buffer.append(cbuf, off, len);
  int newLinePoint = buffer.indexOf(LN);
  if (newLinePoint != -1) {
    String lhs = trimTrailing(buffer.substring(0, newLinePoint));
    delegate.write(lhs);
    delegate.write(LN);
    buffer.delete(0, newLinePoint + 1);
  }
}