[PHPTAL] Escaping of dollar sign ($)

[Iván Montes]

Hi,

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 ($ for $) or custom 
entities. This would remove the need for backtracking when parsing 
interpolatable texts and remove possible ambiguities like the one 
described in the original mail.

/imv

On 10/27/09 11:53 AM, Kornel Lesiński wrote:
> On 26-10-2009 at 23:10:45 Cameron Junge <cameron.junge at 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?
>
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