[Aeditor-talk] Regexp assertions

[Simon Strandgaard]

On Fri, 2003-12-12 at 21:46, Mark wrote:
> the [...] format is now working for non capturing grouping

Add this illegal testcase, it may surprise you.

compile("a[xy)b")   #  compiles fine, shouldn't it fail?



> I've almost finished working on assertions with the following working
> <1,5>	repeat

I think I read that perl6 also has inverse ranges, so that ATOM<!3,5>
are equal to  ( ATOM<0,2> | ATOM<6,> )     not sure though   


> <digit>	named character class
> <[0-9]>	explicit character class
> <-[0-9]> inverse character class
> 
> I still need to work on more complicated assertions such as
> < <digit> - [0-2] > which would match all digits except 0,1 and 2, and code 
> assertions.

Yes thats not trivial. the #parse_charclass will require some rewrite.

The variable 'symbols' (also 'inverse_symbols'), are an Array
containing either 
A) letter        'Y'      
B) letter-range  'X'..'Z'

Some sort of add/subtract for this array seems to be necessary.


> I have a couple of questions
> 
> I want to add some new classes for code assertions and closures,
> 
> CodeBlock
> 	CodeAssertion
> 	Closure

>From my brief understanding of perl6, the only thing which are the
difference on {closure} and <codeassertion>, are that codeassert ignores
the result ?   Is that correct?

If this is the case, then I would join the 2 classes. Perhaps call the
class 'InlineCode'... and have a boolean which indicates weather the
result should be ignored or not.


> am I right in thinking that abstractsyntax.rb is the best place to put them?

Exactly.


> Also I'm making a list of features that I still need. Would it be best to put 
> it in the TODO file or to set up a seperate TODO file for Perl6 features?

make it separate, 'TODO.perl6', 'README.perl6' ... etc.

except for 'CHANGES'.


The last week I have been sick.. now my headache are gone, and I am
ready to work again. I will focus on implementing a better
scanner-routine for Repeat. 

--
Simon Strandgaard