On Tue, 11 Feb 2003 at 10:39:53 +1100, Andrew Savige wrote:
In case anyone is unaware of (-ugene's status in world golf, you can
find out by typing in Eugene van der Pijll at www.googlism.com.
I just typed in 'Eugene' to check.
eugene is the fastest and most pleasant
eugene is about the size
Ian Phillipps sprak:
I just typed in 'Eugene' to check.
eugene is the fastest and most pleasant
eugene is about the size of a dog
eugene is devastated
But, most relevantly,
eugene is right
In my experience, Eugene (and Ton) are always right.
I just noticed that Yitzchak's email
Andrew Savige [mailto:[EMAIL PROTECTED]] wrote:
Winter Christian wrote:
# String to array:
@lines=$x=~/[^\n]/g;
This one splits into array of chars not array of lines.
Shame on me, seems like I was unable to
read what the question was.
-Christian
* Andrew Savige [EMAIL PROTECTED] [2003-02-10 17:54]:
*whistle* *whistle* *red card* *disqualified*
multiplying by length (x+length) will not give the desired
result here; it must be boolean (0 or 1 only).
Doh! Of course. I'm an idiot. *grmbl*
--
Regards,
Aristotle
Andrew Savige schreef:
Aristotle golfed:
$_=$x;@lines=(/^.*/mg)x+length;
Against my better judgment, I will have a go at golfing this:
$_=$x;@l=(/^.*/mg)x/./s
This clobbers $_. Not nice for the rest of the program. Correct is:
{local$_=$x;@l=(/^.*/mg)x/./s}
or
* Eugene van der Pijll [EMAIL PROTECTED] [2003-02-10 18:35]:
Unfortunately, you had use strict in your first post,
and neither of these are use-strict safe.
Oh? What makes you say so?
--
Regards,
Aristotle
(-ugene sprak:
Andrew Savige schreef:
Aristotle golfed:
$_=$x;@lines=(/^.*/mg)x+length;
Against my better judgment, I will have a go at golfing this:
$_=$x;@l=(/^.*/mg)x/./s
This clobbers $_. Not nice for the rest of the program. Correct is:
On Mon, 10 Feb 2003 11:09:25 +1100 (EST), [EMAIL PROTECTED] wrote:
Yitzchak Scott-Thoennes wrote:
Sigh. I'd call that a bug if someone hadn't gone to the trouble to
test for it and document it. (Indeed, I see a bug report out there:
#6653, was 20010327.008.) So do something like:
my
Yitzchak Scott-Thoennes [EMAIL PROTECTED] wrote:
Only if you say $x eq means no lines instead of one empty
line missing its \n :)
Well, the subject line does say textfile-like, and a 0-byte
text file has no lines, not one empty line.
--
Keith C. Ivey [EMAIL PROTECTED]
Washington, DC
On Mon, 10 Feb 2003 23:44:14 -0500, [EMAIL PROTECTED] wrote:
Yitzchak Scott-Thoennes [EMAIL PROTECTED] wrote:
Only if you say $x eq means no lines instead of one empty
line missing its \n :)
Well, the subject line does say textfile-like, and a 0-byte
text file has no lines, not one empty
* John W. Krahn [EMAIL PROTECTED] [2003-02-09 12:27]:
You can also speed up j1 by using map without the braces.
sub j1 { my @lines = map chomp $_, split /^/, $x, -1 }
Which will promptly fail on a last line without a trailing
record separator because chomp would return 0 and cause the
to
Yitzchak Scott-Thoennes wrote:
Sigh. I'd call that a bug if someone hadn't gone to the trouble to
test for it and document it. (Indeed, I see a bug report out there:
#6653, was 20010327.008.) So do something like:
my @lines;
chomp(my $tmp=$x);
@lines = split /\n/,$tmp,-1 or @lines=
@lines = length($x) ? $x=~/^(.*)$/mg : ();
--
John Douglas Porter
__
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John Douglas Porter wrote:
@lines = length($x) ? $x=~/^(.*)$/mg : ();
^ ^^
unnecessary
This is a little faster:
@lines = length($x) ? $x=~/^.*/mg : ();
/-\
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- Send some online love
John Douglas Porter:
@lines = length($x) ? $x=~/^(.*)$/mg : ();
@lines = ($x=~/^.*/mg) x !!length($x);
@lines = ($x=~/^.*/mg) x ($x ne );
This line of play looks promising for golf.
/-\
http://greetings.yahoo.com.au - Yahoo! Greetings
- Send some online love this Valentine's Day.
* Andrew Savige [EMAIL PROTECTED] [2003-02-10 07:28]:
@lines = ($x=~/^.*/mg) x !!length($x);
$_=$x;@lines=(/^.*/mg)x+length;
--
Regards,
Aristotle
Aristotle:
@lines = ($x=~/^.*/mg) x !!length($x);
$_=$x;@lines=(/^.*/mg)x+length;
*whistle* *whistle* *red card* *disqualified*
multiplying by length (x+length) will not give the desired result here;
it must be boolean (0 or 1 only).
/-\
http://greetings.yahoo.com.au - Yahoo!
Aristotle golfed:
$_=$x;@lines=(/^.*/mg)x+length;
Against my better judgment, I will have a go at golfing this:
$_=$x;@l=(/^.*/mg)x/./s
/-\
http://greetings.yahoo.com.au - Yahoo! Greetings
- Send some online love this Valentine's Day.
Aristotle wrote:
my @lines = split m[\Q$/], $x, -1;
This one produces one too many elements in the array.
/-\
http://greetings.yahoo.com.au - Yahoo! Greetings
- Send some online love this Valentine's Day.
Yitzchak Scott-Thoennes wrote:
chomp(my $tmp=$x); my @lines=split /\n/,$tmp,-1
This one fails for the case $x = \n; @lines should contain one
empty element, but the code above contains none.
/-\
http://greetings.yahoo.com.au - Yahoo! Greetings
- Send some online love this Valentine's
To clarify, you may assume that lines in string are separated by
\n but any solution must pass the following edge cases:
1) empty string: @lines should contain zero elements
2) string of \n : @lines should contain one empty element
3) trailing empty lines should be retained
4) you may not
To convert the other way is simpler and I'm struggling to find
alternatives to my original join solution. The only edge case I
can think of is empty array @lines. You may assume that no item
of @lines contains \n. Benchmark program follows.
use strict;
use Benchmark;
my @lines = (
,
This is
On Sun, 9 Feb 2003 14:34:07 +1100 (EST), [EMAIL PROTECTED] wrote:
sub a2 { my $y = ; $y .= $_ . \n for @lines }
The = is optional. my $x; $x.=foo intentionally doesn't warn.
Andrew savige wrote:
sub a1 { my @lines = split(/^/, $x, -1); chomp(@lines) }
sub a2 { my @lines = $x eq ? () : $x =~ /^.*/mg }
sub j1 { my @lines = map { chomp; $_ } split /^/, $x, -1 }
# w1 is Perl 5.8.0 only
sub w1 { open(my $fh, , \$x); my @lines = $fh; chomp(@lines) }
* Andrew Savige [EMAIL PROTECTED] [2003-02-07 13:47]:
my @lines = split(/^/, $x, -1); chomp(@lines); # fastest?
my @lines = split m[\Q$/], $x, -1;
--
Regards,
Aristotle
On Fri, Feb 07, 2003 at 06:26:22PM +1100, Andrew Savige wrote:
my @lines = split(/^/, $x, -1); chomp(@lines); # fastest?
I'll prolly say something stupid here, but:
my @lines = split \n, $x;
Joy,
`/.
--
There are people in the world so hungry, that God cannot appear to
Andrew Savige [EMAIL PROTECTED] wrote:
I am interested to learn the fastest and shortest way to convert a
textfile-like string to an array and back again (chopping newlines).
Not tested, but I would guess that the obvious
@lines = split /\n/, $x, -1; pop @lines;
might be both fastest and
-Original Message-
From: Andrew Savige [mailto:[EMAIL PROTECTED]]
I am interested to learn the fastest and shortest way to convert a
textfile-like string to an array and back again (chopping newlines).
Test program follows. Improvements (golf or speed) welcome.
# String to array:
* John Douglas Porter [EMAIL PROTECTED] [2003-02-07 14:15]:
@lines = split /\n/, $x, -1; pop @lines;
$/ can be different from \n though.
And popping the last field is dangerous - you don't know if
the file ends with a newline. Also, you now have no chance
to reconstruct the exact equivalent
A. Pagaltzis [EMAIL PROTECTED] wrote:
* John Douglas Porter [EMAIL PROTECTED] [2003-02-07 14:15]:
@lines = split /\n/, $x, -1; pop @lines;
$/ can be different from \n though.
Yes, but his example data was text in a here document.
But you can always do
split m,$/, $x, -1;
And
* John Douglas Porter [EMAIL PROTECTED] [2003-02-07 14:50]:
Yes, but his example data was text in a here document.
Then add a note about the caveat.
split m,$/, $x, -1;
In bizarre cases, $/ might contain regex metacharacters.
Don't forget the \Q.
And popping the last field is dangerous -
A. Pagaltzis [EMAIL PROTECTED] wrote:
John Douglas Porter [EMAIL PROTECTED]:
Yes, but his example data was text in a here document.
Then add a note about the caveat.
Sorry, I thought (and still do) that the OP's caveat was
understood to still be in effect.
join \n, @lines, $tail;
* Yitzchak Scott-Thoennes [EMAIL PROTECTED] [2003-02-07 20:51]:
chomp(my $tmp=$x); my @lines=split /\n/,$tmp,-1
Very nice.
--
Regards,
Aristotle
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