Re: Any plans for a 100% wm syntax compatibility?

Daniel Dekany wrote:
> Monday, March 24, 2008, 11:46:39 PM, Jonathan Revusky wrote:
> 
>> Okay, Demetrios, I have a first pass written now. I mostly did this
>> as a technical challenge. I was curious to see how hard it is.
>> (Answer: not very hard, I don't think.)
> [snip]
> 
> What did you done with the semantical differences regarding missing
> variables? 

All the semantics are freemarker semantics. What it does is it uses the 
Velocity parser to build the AST that Velocity builds. Then I have a 
visitor that walks over the Velocity AST and generates a FreeMarker AST.

Then the processing of the template is done with all the FreeMarker 
machinery, so it's the same as what FreeMarker does when it hits an 
undefined variable.

>(I suppose you don't print $noSuchThing (literarily; that's
> how it works in VM) for $noSuchThing.) 

That's the velocity rendering engine that does that kind of silliness. 
This uses the FreeMarker engine, it's just piggy backing off the 
Velocity parser to understand the VTL.

> With the more loose boolean
> logic (e.g. #if $noSuchThing)? 

None of that happens with this. It's all just regular FreeMarker semantics.


> And with the interpolation semantic? As
> you know, VM uses toString(), while we are using localized format by
> default... that can cause 1234 to become 1,234 and like, that can be a
> problem. Oh, and the horror of horrors... with assignments? You know,
> when #set(x = $noSuchThing) just does nothing. Ugh... it would feel
> perverted to emulate this. :)
> 

It all works the way FreeMarker works. Oh, and by the way, I got the 
line number/column information in there too. So, it constructs error 
messages using the location info from the Velocity template.

I think this may have all taken me 4 or 5 hours. I dunno. This Demetrios 
guy had better check this stuff out and test it, or I'll be annoyed... :-)

JR

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