[stringtemplate-interest] padding and such for pretty printing

[Terence Parr]

On Jul 5, 2008, at 1:54 PM, Terence Parr wrote:

> hi! Heh, I need to start thinking about building a pretty printer and
> have a basic architecture in mind. The problem is that I need away in
> ST to pad things out or anchor things more easily. Moreover, I might
> need to say things in the template like "if the help look for this

ooops. voice recog failed.  "if the character width for this element..."

Ter

>
> element exceeds 20 characters, start it on a new line".Technically, we
> can do any expression we want as long as it is on the shape or the
> presence or absence of an attribute. We just can't test its value
> (booleans being the only special case). In other words there is
> nothing against model-view separation doing this:
>
> <if(width(anotherTemplate()) > 20)>...<else>...<endif>
>
> This means we have to add expressions within IF tags and I would need
> to do some type checking to make sure that you only did  computations
> on things like width() function results.
>
> Has anybody built a pretty printer and know what the requirements
> are?  Jurgen Vinju at CWI in Amsterdam has a really nice tool in
> MetaEnv where you can group chunks into effectively large characters
> like latex... it then knows how to move them to a new line or  
> whatever.
>
> Ter
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