The problem is that I really need a lot more flexibility than the JSP
2.0 EL gives. I need to be able to do things like:
- traverse the expression and get the type of each node
- be able to decompose the expression into nodes, so that I can
manipulate Lists/Maps with generics correctly
- set values using the expression(!)
- set values, and correctly instantiate null intermediate values
While I'd like to keep the syntax the same as the EL (and subset of
OGNL that Stripes uses/promotes), what I think I really need is a
expression parser that then lets me work with the expression...
-t
On Jul 19, 2006, at 1:35 PM, Aaron Porter wrote:
> Tim Fennell wrote:
>> Hey,
>>
>> Does anyone on this list have experience writing parsers in Java? To
>> give a little background to that question, I'm considering (and have
>> ...
>>
>> In fact it'd probably just be a subset of the new Unified EL grammar
>> to be consistent. Anyone have good suggestions on the easiest way to
>> create a parser for an EL?
>>
>> -t
>>
> Tim,
> Why not just use the built in EL parser? If I remember correctly,
> when I
> was looking into it for expression validation it looked trivial to use
> your own context. You'd just have to create a VariableResolver to pass
> into ExpressionEvaluator.evaluate(). It looks like the
> VariableResolver
> receives an identifier and returns an Object.
>
> Aaron
>
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