Re: how to find out what variables an expression references?

This should work (code lifted from "?eval" built-in's code):

             SimpleCharStream scs = new SimpleCharStream(new  
StringReader("(" + s + ")"), 1, 1, s.length() + 2);
             FMParserTokenManager token_source = new  
FMParserTokenManager(scs);
             token_source.SwitchTo(FMParserConstants.FM_EXPRESSION);
             FMParser parser = new FMParser(token_source);
             parser.template = getTemplate();
             Expression exp = parser.Expression();

Attila.

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On Oct 7, 2008, at 1:31 PM, conrad wrote:

> Hi,
>
> I'm wondering if anyone can help me with following situation...
>
> I'm trying to figure out how I could parse a freemarker expression  
> in order to
> get a list of the variables the expression (or template) references.
>
> I need this because I want to dynamically fetch the referenced  
> variables from a
> user interface when the template is rendered.
>
> I tried parsing an expression using the FMParser, but I run into all  
> kinds of
> trouble, so this does not seem the appropriate way to go about this.
>
> ... anyone know how to handle this?
>
>
>
> Thnx,
> Conrad.

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