metal:use-macro should be TALES?
Not quite, I want to choose the file to include, not just have a
string " foo/${dat/bar}/
baz.xml" in the output.
I'm very wary of replacing all &s with & - I'm expecting something like
<a href="http://server/cgi?foo=bar&baz=boogie">http://server/cgi?foo=bar&baz=boogie</a>
where the visible content has & but the href has &, so replacing
all &s would be Bad.
Patch:
--- lib/Petal/CodeGenerator.pm 2006-01-17 12:27:53.000000000 +0000
+++ libnew/Petal/CodeGenerator.pm 2006-03-06 11:40:46.000000000 +0000
@@ -233,15 +233,23 @@
my $included_from = $petal_object->_file();
$included_from =~ s/\#.*$//;
+ # allow ${dat/var} expansion in includes
+ if($path=~ /^\$\{(.*)\}$/ ) {
+ $path = $class->comp_expr_encoded ($1);
+ } else {
+ $path = "'$path'";
+ }
+
$class->add_code ("do {");
$class->indent_increment();
$class->add_code ("my \$new_hash = \$hash->new();");
$class->add_code ("\$new_hash->{__included_from__} = '$included_from';");
+ $class->add_code ("my \$path = $path;");
(defined $lang and $lang) ?
- $class->add_code ("my \$res = eval { Petal->new (file =>
'$path', lang => '$lang')->process (\$new_hash) };") :
- $class->add_code ("my \$res = eval { Petal->new
('$path')->process (\$new_hash) };");
+ $class->add_code ("my \$res = eval { Petal->new (file =>
\$path, lang => '$lang')->process (\$new_hash) };") :
+ $class->add_code ("my \$res = eval { Petal->new
(\$path)->process (\$new_hash) };");
·····
$class->add_code ("\$res = \"<!--\\n\$\@\\n-->\" if (defined \$\@
and \$\@);");
$class->add_code ("\$res;");
A bit (OK, a lot) hacky, but it allows me to dynamically choose the
file to be included.
I think the underlying problem is that nested variables aren't
supported, as otherwise
<xi:include href="${dat/header}" />
would be canonicalized to
<?include href="<?var name="dat/header"?>"?>
or whatever and expanded accordingly. I can see how nested expressions
would be complicated though 
On 3/3/06, Jonathan Vanasco <jon@...> wrote:
> Usually for things like that, i do:
>
> <tal tal:omit-tag="string:1" tal:define="dynVar foo/${dat/bar}/
> baz.xml"/>
> <span tal:attributes="class var"/>
>
> I'm not sure if that will work in your example.
>
> btw, you can just
> $processed =~ s/&/&/g ;
>
> i do that for a bunch of petal symbols when doing emails/etc
>
>
> On Mar 3, 2006, at 10:54 AM, adam wrote:
>
> > Howdy.
> >
> > I'm fairly new to petal, and have been battling through the
> > standard problems (overcoming my aversion to &s in hrefs,
> > javascript stuff etc etc), but am stumped on the latest one.
> >
> > Basically I want to choose which metal template to use at run-time,
> > using something along the lines of
> >
> > metal:use-macro="dat/header" or
> > metal:use-macro="foo/${dat/bar}/baz.xml" or
> > metal:use-macro="string: dat/header"
> >
> > Is this supported? Should I be doing something entirely different?
> >
> > Thanks for your help,
> > --
> > Adam
--
Adam
--
Adam
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