NET/worlds/scape/IndentStream.java


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package NET.worlds.scape;

import java.io.OutputStream;
import java.io.PrintStream;

public class IndentStream extends PrintStream {
   private boolean _atstart = true;
   private int _indent = 0;

   public IndentStream(OutputStream os) {
      super(os);
   }

   public IndentStream(OutputStream os, boolean flush) {
      super(os, flush);
   }

   public void indent(int step) {
      this._indent += step;
   }

   public void indent() {
      this.indent(2);
   }

   public void undent(int step) {
      if (this._indent >= step) {
         this._indent -= step;
      } else {
         this._indent = 0;
      }
   }

   public void undent() {
      this.undent(2);
   }

   public int curIndent() {
      return this._indent;
   }

   private void startLine() {
      for (int i = 0; i < this._indent; i++) {
         super.write(32);
      }

      this._atstart = false;
   }

   @Override
   public void write(int b) {
      if (b == 10) {
         this._atstart = true;
      } else if (this._atstart) {
         this.startLine();
      }

      super.write(b);
   }

   @Override
   public void write(byte[] b, int off, int len) {
      while (len > 0) {
         int firstlen = 0;

         while (firstlen < len && b[off + firstlen] != 10) {
            firstlen++;
         }

         if (firstlen > 0) {
            if (this._atstart) {
               this.startLine();
            }

            super.write(b, off, firstlen);
            off += firstlen;
            len -= firstlen;
            this._atstart = false;
            firstlen = 0;
         }

         while (firstlen < len && b[off + firstlen] == 10) {
            firstlen++;
         }

         if (firstlen > 0) {
            super.write(b, off, firstlen);
            off += firstlen;
            len -= firstlen;
            this._atstart = true;
         }
      }
   }
}