Tag: PerlParents:
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Perlgeek.de Blog :: What you can write in Perl 6 today
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Tags: [Perl]
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Patrick Michaud (re)wrote an RPN calculator in Perl 6. Perl 6 is so cool.
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Tags: [Perl]
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Parrot 1.0.0 "Haru Tatsu" Released! (via). Wow, I didn't even realize they were close to 1.0. Here's hoping Perl 6 won't be too far behind. I'm really looking forward to it. I think it's going to be a very fun language to program in.
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Tags: [Perl]
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use Perl | Perl 5 now uses Git for version control.
In true open source style, Sam Vilain converted Perl's history from Perforce to Git. He did the work both in his spare time and in time donated by his employer, Catalyst IT. He spent more than a year building custom tools to transform 21 years of Perl history into the first ever unified repository of every single change to Perl. In addition to changes from Perforce, Sam patched together a comprehensive view of Perl's history incorporating publicly available snapshot releases, changes from historical mailing list archives and patch sets recovered from the hard drives of previous Perl release engineers.
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Tags: [Git, Perl]
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chromatic on Python 3000:
I'm not criticizing Python 3.0 by any means. It's a decent, modest improvement on a decent, modern language. Just don't mistake it for anything revolutionary, and don't pretend that it didn't also take almost a decade, even with Googlebucks-funded development.
Hmm.
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Tags: [Perl, Python]
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Perl 6 1.0 in March? It's taken forever but from some of the stuff I've seen, Perl 6 looks like it'll be a terribly fun (and powerful) language to code in.
Update: Misread... Parrot 1.0 is scheduled for March, not Rakudo 1.0 (i.e. Perl 6).
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Tags: [Perl]
Gema:
gema is a general purpose text processing utility based on the concept of pattern matching. In general, it reads an input file and copies it to an output file, while performing certain transformations to the data as specified by a set of patterns defined by the user. It can be used to do the sorts of things that are done by Unix utilities such as cpp, grep, sed, awk, or strings. It can be used as a macro processor, but it is much more general than cpp or m4 because it does not impose any particular syntax for what a macro call looks like. Unlike utilities like sed or awk, gema can deal with patterns that span multiple lines and with nested constructs. It is also distinguished by being able to use multiple sets of rules to be used in different contexts.
Another neat feature is that it has bindings to Lua that let you run arbitrary Lua code to operate on the result of a match.
I came across Gema years ago, but while I've never had the opportunity to use it for anything, I kept it in the back of my mind as an interesting project. I've been wondering how similar what it does is to Perl 6 grammars, so I've been meaning to check out Gema again, although I couldn't remember the name until just now.
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Moritz Lenz's blogs on Perl 6, intended for people familiar with Perl 5, have done a lot to get me re-interested in Perl 6, despite how long it's taken to develop.
My understanding is that a full release of Perl 6 is probably another year away, but it may have been worth the wait. Perl 6 looks like a really fun language.
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Tags: [Perl]
Re: translate Perl diamond operator to Ruby.
Perl:
while(<>){
...
}
Ruby:
ARGF.each do |$_|
...
end
At this point I question whether I'd ever use Perl for anything again. Until now, Perl filled a niche where if the code I wanted to write would fit in 10 lines or so, and did a lot of string manipulation, I'd turn to Perl. Otherwise Python. Now I think I'll just use Ruby for everything 
Substring in C# (and Java) throw an exception if you take a substring and give it a length (or a starting position) that puts you after the end of the string. That's basically to ensure that you always get a string that's exactly the length you want? Rather than just being able to take a substring and not having to worry about it, you have to include code like the following around every single substring you ever take:
if (str.Length > 30){
str = str.Substring(0, 30);
}
Typically when you take a substring you want to ensure that your string is no longer than a certain number of characters. I can't think of a situation that would it a good idea for the language to enforce that you can't get a string that's less than the maximum length you want instead of exactly the length you want.
On the other hand, most of the dynamic languages (PPPR) let you substring off the end of the string without worrying about it.
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perl.com: Perl Command-Line Options. Good reference and tutorial.
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Tags: [Perl]
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Here's some quick Perl I used to unescape some form-encoded data:
while(<>){
s/\+/ /g;
s/%([0-9A-Fa-f]{2})/chr(hex($1))/ge;
print;
}
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Tags: [Code, Perl]
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reform - Third millenium syntax for Perl 5 OOP (via Keith). Actually reasonable OO syntax in Perl.
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Tags: [Perl, Programming]
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First monads in Perl, now monads in Ruby (via Keith Gaughan, via The Farm), both still to read.
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Tags: [Monads, Perl, Programming, Ruby]
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Friday, April 24, 2009
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