[Zope] Zope 2.1.0 &dtml-expr="5+5"; doesn't work anymore?

[Jim Fulton]

Joe Grace wrote:
> 
(snip)
> 
> I just upgraded from Zope 2.0.0 (stable version I believe) to Zope 2.1.0
> and my site broke where I use
> 
>     &dtml-expr="";

This was never correct usage. If it ever worked, it was a bug.
When using the entity-regerance syntax in 2.0, you aren't allowed to
specify any attributes. The form is:

  &dtml-foo;

which is equivalent to:

  <dtml name="foo">

> 
> syntax.  I looked in the release notes for any changes to DTML syntax
> but noticed none which seem to cause my problem.  (However, this same
> thing happened to me upgrading to 2.0.0 and the docs escaped my notice
> then so...)  Basically, I'm using
> 
>     <... &dtml-expr="Python calculations go here"; ...>
> 
> e.g.,
> 
>    <TR BGCOLOR="#&dtml-expr="_.hex( 0xF8 -
> depth)[2:]";&dtml-expr="_.hex(
> 0xF8 - depth)[2:]";FF">
> 
> in several places.  I noticed that the entity syntax has been upgraded
> with qualifiers.  I've also tried a whole bunch of syntactic variations
> to get my &dtml-expr=""s to work, all to no avail.  Finally, I've
> practiced newbie Zope Zen and tried to decipher DT_Var.py (or
> thereabouts) to see if I could figure out the fate of &dtml-expr.
> Anyway...
> 
> Has &dtml-expr="" been deprecated, i.e., removed from Zope, or have I
> just failed to find the new secret incantation which gets me an
> expression using the entity syntax?

It was never supported. I'm quite surprized that it worked.
 
> Needless to say, any help appreciated.  I don't mind changing my code,
> but I do need to know the new Zope 2.1.0 Zen of &dtml-expr="";).

The new and old Zope zen is that you can't use '&dtml-expr="";'.

Use <dtml expr="">.  If you need to use an entity reference, then
you need to use a with or let tag:

 <dtml-with "_(
     bgcolor=_.hex( 0xF8 - depth)[2:]
    )">
  <TR BGCOLOR="#&dtml-bgcolor1;&dtml-bgcolor1;FF">
 </dtml-with>

Jim

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