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This is a structured whitespace globbing implementation that uses an early whitespace filtering while the resource is loaded.

This version inherits from org.apache.velocity.tools.view.WebappResourceLoader, but one could easily craft a version inheriting from org.apache.velocity.runtime.resource.loader.FileResourceLoader.

To use it, you would typically put the following lines in your velocity.properties:

resource.loader = globbing,string
globbing.resource.loader.class = StructuredGlobbingResourceLoader
string.resource.loader.class = org.apache.velocity.runtime.resource.loader.StringResourceLoader

StructuredGlobbingResourceLoader.java

/*
 * Copyright 2000-2004 The Apache Software Foundation.
 *
 * 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 import org.apache.velocity.tools.view;

import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;

public class StructuredGlobbingResourceLoader extends WebappResourceLoader
{

  public static class VTLIndentationGlobber extends FilterInputStream
  {
    protected String buffer = "";
    protected int bufpos = 0;
    protected enum State
    {
      defstate, hash, comment, directive, schmoo, eol, eof
    }
    protected State state = State.defstate;
  
    public VTLIndentationGlobber(InputStream is)
    {
      super(is);
    }

    // TODO - multiline comments #* ... *# not taken into account for now in all cases
    public int read() throws IOException
    {
      while(true)
      {
        switch(state)
        {
          case defstate:
          {
            int ch = in.read();
            switch(ch)
            {
              case (int)'#':
                state = State.hash;
                buffer = "";
                bufpos = 0;
                return ch;
              case (int)' ':
              case (int)'\t':
                buffer += (char)ch;
              break;
              case -1:
                state = State.eof;
                break;
              default:
                buffer += (char)ch;
                state = State.schmoo;
                break;
            }
            break;
          }
          case eol:
            if(bufpos < buffer.length()) return (int)buffer.charAt(bufpos++);
            else
            {
              state = State.defstate;
              buffer = "";
              bufpos = 0;
              return '\n';
            }
          case eof:
            if(bufpos < buffer.length()) return (int)buffer.charAt(bufpos++);
            else return -1;
          case hash:
          {
            int ch = (int)in.read();
            switch(ch)
            {
              case (int)'#':
                state = State.directive;
                return ch;
              case -1:
                state = State.eof;
                return -1;
              default:
                state = State.directive;
                buffer = "##";
                return ch;
            }
          }
          case directive:
          {
            int ch = (int)in.read();
            if(ch == (int)'\n')
            {
              state = State.eol;
              break;
            }
            else if (ch == -1)
            {
              state = State.eof;
              break;
            }
            else return ch;
          }
          case schmoo:
          {
            int ch = (int)in.read();
            if(ch == (int)'\n')
            {
              state = State.eol;
              break;
            }
            else if (ch == -1)
            {
              state = State.eof;
              break;
            }
            else
            {
              buffer += (char)ch;
              return (int)buffer.charAt(bufpos++);
            }
          }
        }
      }
    }

    public int read(byte[] b, int off, int len) throws IOException
    {
      int i;
      int ok = 0;
      while (len-- > 0) {
        i = read();
        if (i == -1) return (ok == 0) ? -1 : ok;
        b[off++] = (byte) i;
        ok++;
      }
      return ok;
    }

    public int read(byte[] b) throws IOException
    {
      return read(b,0,b.length);
    }

    public boolean markSupported()
    {
      return false;
    }
  }

  public synchronized InputStream getResourceStream(String name)
  {
    return new VTLIndentationGlobber(super.getResourceStream(name));
  }

  // test
  public static void main(String args[])
  {
    try
    {
      java.io.BufferedReader reader = new java.io.BufferedReader(new java.io.InputStreamReader(new VTLIndentationGlobber(new java.io.FileInputStream(args[0]))));
      String line;
      while( (line = reader.readLine() ) != null )
      {
        System.out.println(line);
      }
    }
    catch(IOException ioe)
    {
      ioe.printStackTrace();
    }
  }

}


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