[stringtemplate-interest] Passing values into templates

[Ben Hood]

On 19 Apr 2008, at 23:18, Zenaan Harkness wrote:

>> I'd like to be able to implement the readBytes(length) template in a
>> subtemplate that is specific to the target language.
>
> So your sub-group has a line near the top that says something like:
>
> group my-language-or-subgroup-name : super-group-name;

No, I was doing that programmatically rather than using any syntax  
available in the template definition. I didn't even know you could do  
something like

group sub : super;

because it doesn't seem to appear in the documentation.

> And then your sub-groups (one for each language), implement
> readBytes(length)?
>
> Then it should work.
>
> I haven't used STGroup interfaces yet, so someone else would have to
> comment on that.
>
> If it's not running, perhaps your value being passed to readbytes is  
> all
> that needs to change (you do know you can't do any maths  
> calculations in
> ST yes (except for if/endif)?).
>
> Eg:
>   return <readBytes("length= next - 0x20")>;

If I do this, i.e. return <readBytes(length="next - 0x20")>; then I  
run into this error:

action parse error in group GenricReader line 7; template context is  
[decode]
line 1:1: unexpected token: readBytes

when the readBytes template is defined as

readBytes(length) ::= "foo"

Ben