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Re: $1, etc. are not just strings

by ikegami (Pope)
on Jan 04, 2007 at 16:49 UTC ( #592985=note: print w/replies, xml ) Need Help??


in reply to $1, etc. are not just strings

That reminds me of the danger of passing a var to a function that modifies that var. It's particularly easy to screw up when dealing with built-in globals variables such as $1.

sub func { 'b' =~ /(.)/; print(@_, "\n"); } 'a' =~ /(.)/; func($1); # Prints "b" 'a' =~ /(.)/; func("$1"); # Prints "a"
sub func { eval { die "bar\n" }; print(@_); } eval { die "foo\n" }; func($@); # Prints "bar" eval { die "foo\n" }; func("$@"); # Prints "foo"

(If you want to mess with your mind, try removing the second 'a' =~ /(.)/; from the first snippet.)

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[ambrus]: Corion: as for that, I talked with schmorp, and looked a bit more at Prima
[ambrus]: Corion: from the docs, it definitely looks like it would be possible to write an AnyEvent driver for it using Prima::File and Prima::Timer.
[ambrus]: (I haven't found an idle event.)
[ambrus]: However, I also looked at the internals, and found two interesting things:
[marto]: stupid xpath question, I have a xpath copied from the browser, is the * wildcard supposed to work for IDs? e.g. '//*[@id="*"]/ div/div/header/p/a '?
[ambrus]: The main loop for unixish systems is in https://metacpan. org/source/ KARASIK/Prima-1. 49/unix/apc_app.c. It is a hand-rolled select loop, but also always spins at least once every 0.2 seconds for some reason.
[ambrus]: marto: no, not that way. if you just want to test for an existing id attribute, then write *[@id] , or you can match a regexp to the value of that attribute like *[@id=~/something/ ]
[marto]: ambrus, thanks I ended up going with '//*[starts- with(@id, "thread_")]...

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