Re: [PHPTAL] Escaping of dollar sign ($)
On 03-11-2009 at 17:56:02 Tobias Herp bruno-the-questiona...@gmx.net
wrote:
Kornel Lesiński wrote:
I could change it to:
${x} → value
$${x} → ${x}
$$${x} → $value
{x} → $${x}
${x} → $$value
$${x} → $$${x}
etc.
Yes, please!
This is logical, and it is the behaviour defined by the TALES standard
(http://wiki.zope.org/ZPT/TALESSpecification13#required_type_prefixes).
The current behaviour is a *bug* and should be fixed.
OK. That's a good point.
• Pre-filters may need to deal with this to (un)escape text properly.
With simpler rules you can just replace ${ with $${ to escape text.
It's not so easy when you need to observe even/odd number of $s.
Well, you can consume the text sequentially and change every $$ into $,
and treat every ${ or $\w as the beginning of a variable. Doesn't look
very complicated to me.
Using regular expressions, you could look for $(.); if \1 is another $,
you have a literal $, etc. Anything else but [${\w] should yield an
error, of course!
How do you halve/double number of $'s with regular expression?
--
regards, Kornel
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Re: [PHPTAL] Escaping of dollar sign ($)
On 04-11-2009 at 10:22:56 Tjerk Meesters tjerk.meest...@gmail.com wrote:
Would it be possible to use a preg_replace() with two expressions, one
to replace $$ by $ and one to handle \b${?(\w+)
You'd have to use assertions or other tricks, to avoid replacing unrelated
$$s.
I think I'll just have to provide (un)escaping function for prefilters.
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Re: [PHPTAL] Escaping of dollar sign ($)
Kornel Lesiński wrote:
I could change it to:
${x} → value
$${x} → ${x}
$$${x} → $value
{x} → $${x}
${x} → $$value
$${x} → $$${x}
etc.
Yes, please!
This is logical, and it is the behaviour defined by the TALES standard
(http://wiki.zope.org/ZPT/TALESSpecification13#required_type_prefixes).
The current behaviour is a *bug* and should be fixed.
It's ok to add features to ZPT (especially the definition of operators); but
IMO it's /not/ ok to change the meaning of existing syntax.
However:
• Pre-filters may need to deal with this to (un)escape text properly.
With simpler rules you can just replace ${ with $${ to escape text.
It's not so easy when you need to observe even/odd number of $s.
Well, you can consume the text sequentially and change every $$ into $, and
treat every ${ or $\w as the beginning of a variable. Doesn't look very
complicated to me.
Using regular expressions, you could look for $(.); if \1 is another $, you
have a literal $, etc. Anything else but [${\w] should yield an error, of
course!
• It breaks backwards compatibility (hopefully not many people have
$$${x} in their templates)
I doubt so; I can hardly imagine a serious use of sequences of two or more
dollar signs.
--
Cheers,
Tobias
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Re: [PHPTAL] Escaping of dollar sign ($)
What about the html entity: #36;
On 26/10/2009 23:10, Cameron Junge cameron.ju...@finda.co.nz wrote:
Hi All,
Not sure if this has been covered on this list before, my quick search
couldn't find anything that seemed appropriate.
If I wish to display a $ followed by a tal variable using the inline
syntax (ie. ${variable}) then I have to either:
a) put a space between the 2 $ signs; or
b) use a tag to spit the variable out; or
c) use a phptal_tales expression.
Eg. if I have a variable amount with the value 100, and I want to
display is as $100 then I either have to do:
a) $ ${amount}; or
b) $tal:block replace=amount /; or
c) tal:block replace=money: amount /
Various attempts at escaping have failed. $$${amount} comes out as
$${amount}; $${amount} comes out as ${amount}
I know that there are workarounds, but surely there must be some way to
do what is relatively simple? or is this a bug?
Cheers, Cameron.
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Re: [PHPTAL] Escaping of dollar sign ($)
On 26-10-2009 at 23:10:45 Cameron Junge cameron.ju...@finda.co.nz wrote:
Eg. if I have a variable amount with the value 100, and I want to
display is as $100 then I either have to do:
a) $ ${amount}; or
b) $tal:block replace=amount /; or
c) tal:block replace=money: amount /
$x tal:replace=amount/
${money:amount}
I think the last one isn't bad.
Various attempts at escaping have failed. $$${amount} comes out as
$${amount}; $${amount} comes out as ${amount}
I know that there are workarounds, but surely there must be some way to
do what is relatively simple? or is this a bug?
Strictly speaking it's not a bug (it's deliberately coded that way). It's
PHPTAL's simplistic approach to escaping of ${}:
1. '$${' is not interpreted as start of interpolated expression
2. '$${' is replaced with '${'
This gives:
${x} → value
$${x} → ${x}
$$${x} → $${x}
{x} → $$${x}
${x} → {x}
etc.
I could change it to:
${x} → value
$${x} → ${x}
$$${x} → $value
{x} → $${x}
${x} → $$value
$${x} → $$${x}
etc.
However:
• Pre-filters may need to deal with this to (un)escape text properly. With
simpler rules you can just replace ${ with $${ to escape text. It's not so
easy when you need to observe even/odd number of $s.
• It breaks backwards compatibility (hopefully not many people have $$${x}
in their templates)
Deal PHPTAL users, what's your opinion on this?
--
regards, Kornel
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Re: [PHPTAL] Escaping of dollar sign ($)
I vote for not changing the current behaviour; I agree that if it's
documented, it can be a little weird ;-)
Personally I would choose to have a money formatter TALES construct,
because I hate having to go through my templates again when I start
adding another currency for instance.
Best,
Tjerk
2009/10/27 Kornel Lesiński kor...@aardvarkmedia.co.uk:
On 27-10-2009 at 12:34:42 Iván Montes drsl...@pollinimini.net wrote:
I vote for not changing the behavior but I would like, for next major
version of PHPTAL, to break BC for escaping and remove the escaping of
the dollar symbol:
${variable} - variable
$${variable} - $variable
Since TAL is heavily based on HTML/XML semantics I guess it makes more
sense to escape using unicode point codes (#36; for $) or custom
entities.
Unfortunately in XML it shouldn't matter whether you use literal $ or #36;
(the difference is completely lost if you use W3C DOM for example).
Theoretically PHPTAL should support #x24;#x7b;var#x7d; as well as ${var}
:/
Custom entities require custom DOCTYPE/DTD, and that's just a can of worms.
This would remove the need for backtracking when parsing
interpolatable texts and remove possible ambiguities like the one
described in the original mail.
It can be unambiguous. It just has to be clearly defined and implemented in
one way or another :)
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regards, Kornel
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