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[Parse] Discussion of PARSE dialect

Maxim
24-Dec-2008
[3390]
but, in R2,  I'm not using it for some reason I don't remember... 
I actually use the change/part within a paren and manually set the 
series using the :here trick.
BrianH
24-Dec-2008
[3391]
Right. All of the PARSE proposals have (awkward) R2 equivalents :)
Maxim
24-Dec-2008
[3392x3]
ahh... its all string based.
yep... cause I've been doing all of them in remark for a year  :-)
although the 'USE really makes a BIG capability boost in PARSE.
BrianH
24-Dec-2008
[3395]
I had to clean up a few REBOL 2 assumptions in the proposals list, 
mostly by Peta, through no fault of their own :(
Maxim
24-Dec-2008
[3396x2]
so I'll go back to the batcave and continue working on remark v2, 
and some other stuff... I want to release since a long time
its fun to be able to read all that stuff about parse and *get* it.
BrianH
24-Dec-2008
[3398]
Yeah, the R2 equivalent of USE is the most awkward :(
Maxim
24-Dec-2008
[3399]
not so long ago, it used to be magic...  nothing to big, or I'd get 
really lost.
BrianH
24-Dec-2008
[3400x3]
The biggest problem you would have if compiling the new rules to 
their R2 equivalents would be to generate all of the intermediate 
variables and make sure their bindings are not corrupted on recursion.
If you weren't careful you could easily overflow system/words :(
Must go now - it's been fun :)
Maxim
24-Dec-2008
[3403]
yes cool.  ciao...
BrianH
29-Dec-2008
[3404]
I finished the Parse Proposals cleanup again. Enjoy!
GiuseppeC
29-Dec-2008
[3405x2]
I have read the cleanupped version. I like the "To-Thru" proposal 
to match for multiple ends but I have read that full grammar could 
not be used for "performance reasons".
However the proposal is really big and I think that implementing 
it would not be so easy and fast. Will we see it complete at the 
end of 2009 ? It is only Carl working on it :-(
BrianH
29-Dec-2008
[3407x2]
The real advantage to the TO/THRU enhancement comes when it lets 
you avoid creating charsets, which are a lot less useful with Unicode. 
It should be pretty easy to implement.
I think that the proposals are more than Carl was thinking they would 
be - apparently he had forgotten the previous proposal lists. I don't 
think that it will be too much of a problem though, as there are 
not really that many proposals that are likely to be accepted. Some 
are competing proposals, of which only one would be chosen. Also, 
there aren't that many proposals overall - they are just thoroughly 
specified.
GiuseppeC
29-Dec-2008
[3409x3]
Lets see how things evolves. Proposal are very interesting as they 
would easy a lot of work on building parse rules. Everything is silent 
apart some blog messages where I have read for the first time the 
word "Beta" connected with REBOL3.
(*ease)
Good night. Here in Italy is 20 past 1AM.
BrianH
29-Dec-2008
[3412x4]
My main concern is that Carl's main requirements of the proposal 
process have been ignored in some cases:

- That the proposals be concisely specified. The Purpose and Importance 
statements should be one sentence each.
- That there be no discussion of theory.
- That there be no specification of equivalent rules.
- That all discussions happen outside of the wiki.
- That this is a proposals page, not documentation.
While I appreciate the speculative documentation, it will need to 
be moved to another page once the proposals process is done.
As it is, I hope Carl will read a paper that long when he gets to 
the point of taking on PARSE.
The whole point of the proposals process was to prevent exactly what 
happened, so in that respect I failed.
PeterWood
29-Dec-2008
[3416]
If Carl sticks to his word in his intial request all the proposals 
will be rejected:


Each improvement will require test code be provided that would certify 
its correctness. No test code, no improvement. (Sorry... you often 
ask me what you can do to help. Please don't put the burden of testing 
such changes on me.)
BrianH
29-Dec-2008
[3417x3]
The test code hasn't been written yet.
The initial request was not the blog post - that came later.
The test code won't be in the wiki.
PeterWood
29-Dec-2008
[3420]
That doesn't appear logical to me. In his blog Carl specifically 
stated that proposals without test ocde would not be considered. 
You are saying the opposite.
BrianH
29-Dec-2008
[3421x3]
He didn't say that to me, nor did he specify any format for the test 
cases in his initial version of the proposals wiki.
We will have test cases once the test case syntax is specified.
They won't go in the wiki though, at least not the main page. The 
page is too big already.
Janko
31-Jan-2009
[3424]
Hi, I need am asking for some help with parse again... are there 
any detailed docs with examples about parse?
Josh
31-Jan-2009
[3425]
One that I used when I was learning was Brett's  http://www.codeconscious.com/rebol/parse-tutorial.html
Graham
31-Jan-2009
[3426x2]
Brett has lots of examples on parse
oops ... snap!
[unknown: 5]
31-Jan-2009
[3428]
http://www.rebol.com/docs/core23/rebolcore-15.html
Janko
31-Jan-2009
[3429x6]
aha, I remeber I learned a lot from that green page too.. thanks 
for links so far , I will read the pages and hopefully I will find 
something related to the problems I have
thanks paul for your link too, I couldn't find that page on google 
( I did the bret's one)
the last problem I had and steeve and oldes propsoed solutions... 
I got steeve's one but I don't get what "complement charset" in olde's 
does.. >>str: "a.b.c.d!e?f. " chars: complement charset ".!?" >> 
parse str [any chars tmp: to end (uppercase tmp)] str == "a.B.C.D!E?F. 
"<<
I think my problem is of this kind: http://www.mail-archive.com/[rebol-list-:-rebol-:-com]/msg16347.html
or in terms of Brett's examples: == true

>> a: copy "dog cat" parse a [ ANY [ thru "dog" (print 1) | thru 
"cat" (print 2) ] ]
1
2
== true

>> a: copy "cat dog" parse a [ ANY [ thru "dog" (print 1) | thru 
"cat" (print 2) ] ]
1
== true
basically similar problem that last time as I see now.. so by looking 
at that mailing list answers I have 2 solutions ... I use parse 3 
times on a string.. or maybe I use Ladislav's parseen which he said 
solves this.. but I don't yet know how :)
[unknown: 5]
31-Jan-2009
[3435]
What do you want to accomplish?
Janko
31-Jan-2009
[3436]
=heading=
[unknown: 5]
31-Jan-2009
[3437]
is that your answer?
Janko
31-Jan-2009
[3438x2]
no .. I am writing example
S WORKS IF IN THIS ORDER

=heading=

{comment some comment}

- line 1
- line 2

------------->

<h1>heading</h1>

<p>comment some comment</p>

<li>line 1<li>
<li>line 2</li>

THIS DOESN'T WORK

=heading=

{comment some comment}

=heading=

- line 1
- line 2

=heading=

{comment some comment}

ADDITIONAL (SIMILAR) PROBLEM

- line 1
+ line 2
+ line 3
- line 4
+ line 5

----------------->

<li class="a">line 1</li>
<li class="a">line 2</li>
...