Re: Custom encoding a string value

Hi Daniel,

Thanks for the help. I have implemented TemplateMethodModel and used 
Apache commons/codec to do the quoted-printable encoding. As I require 
the functionality with the current release I have not added it to the 
upcoming version. I'll try to find some time to see if I can add it.


Thanks,

Martijn Brinkers


The QP function for Freemarker:

import java.util.List;

import mitm.common.locale.CharacterEncoding;

import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.net.QuotedPrintableCodec;

import freemarker.template.SimpleScalar;
import freemarker.template.TemplateMethodModel;
import freemarker.template.TemplateModelException;

/**
  * A 'function' for Freemarker that allows you to encode a string to 
quoted-printable
  *
  */
public class QuotedPrintableEncodeMethod implements TemplateMethodModel
{
     public static String METHOD_NAME = "qp";

     @SuppressWarnings("unchecked")
     public Object exec(List arguments)
     throws TemplateModelException
     {
         if (arguments.size() != 1 && arguments.size() != 2) {
             throw new TemplateModelException(METHOD_NAME + " needs 1 or 
two arguments.");
         }
         try {
             String input = (String) arguments.get(0);

             String charset = arguments.size() == 2 ? (String) 
arguments.get(1) : CharacterEncoding.UTF_8;

             QuotedPrintableCodec codec = new QuotedPrintableCodec(charset);

             return new SimpleScalar(codec.encode(input));
         }
         catch (EncoderException e) {
             throw new TemplateModelException("Quoted Printable encoding 
failed", e);
         }
     }
}

Daniel Dekany wrote:
> Tuesday, December 1, 2009, 2:18:23 PM, martijn.list wrote:
> 
>> Hi,
>>
>> I would like to add my own string encoding to Freemarker.
>>
>> I would like to encode a string to quoted-printable format. There are 
>> built-in encodings like ?html. Is it possible to add for example ?QP 
>> (for quoted printable)?
>>
>> What is the best approach for me?
> 
> Write a #function or a TemplateMethodModelEx for it, and put that in a
> file that you #import (or #include) everywhere. Or, write a
> TemplateMethodModelEx and set it as shared variable in the
> Configuration object. In any case, you will be able to do something
> like this: qp(theExpression), but not theExpression?qp, since ?stuff
> is reserved for core stuff (mostly that's why it exist at all).
> 
> Another possibility is that you contribute and then ?qp can be part of
> the next FreeMarker release (and immediately of he nightly build).
> Note that QP is a charset-aware algorithm, so it need a charset
> parameter that defaults to .output_encoding, just like in the case of
> ?url.
> 
>> Kind regards,
>>
>> Martijn Brinkers
>>
>>
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> 


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