17 Sep
2012
17 Sep
'12
12:21 p.m.
Am 14.09.2012 um 14:35 schrieb H. Hirzel <hannes.hirzel(a)gmail.com>om>:
On 9/14/12, Stephan Eggermont <stephan(a)stack.nl>
wrote:
I experienced that limit and it is 254 instance variables.
Guillermo wrote:
I put them into into method categories and that works very fine for me.
(growing to 300,
Maybe you can use a -completely separate-
pre-parser? :)
It takes the input with the pre processor directives, and answers a new
processed string which the original parser will handle?.
Yes, I guess so. I'm fighting a bit with PetitParser, wondering if the
traditional
style of building parsers wouldn't be faster. But that might be just about
trying
something new. I like the tests, the separate lexicon, syntax and semantics
subclassing not so much better than preprocessing, scanning, parsing.
I definitely don't like having 80 productions in a class not
sure how to grow over the max nr of instVars ).
I assume it is not possible to have more than 255 rules in a class but
I have not tried this limit yet.
But you can start combining parser as I understand. I
have not done
this either, so I would appreciate to be pointed to an example
In order to combine parsers you need separate grammar parts that can be combined with a
single rule. I think this can be a heavy task if you have a huge grammar and you like to
split it into parts. I tried something by having delegating parsers. Meaning putting
productions in separate classes and delegate to the parsers inside a production rule.
After a while I started to dislike the approach and got rid of the separate classes again.
Instead I compacted the rules a bit. Rules that were really close to each other I have
combined in one method having the individual rules in temporary variables. Until now I
didn't find any better approach. If the project is huge and a lot of extra complexity
is ok then using Lukas' approach in Helvetia would be feasible. By introducing a
separate smalltalk parser the accesses to instance variables are mapped onto a dictionary.
This way the limit isn't there.
Norbert
--Hannes
Is there an array or
dictionary
based PPCompositeParser?
Stephan
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