Re: Print all derefs and method calls in a directory (Friday golf)

Addressing the golfing request,

# 123
rgrep  -e'->' * | perl -ne '/(\S{3,80}->\S{5,80})/;print $1,"\n"' | pe
+rl -pe's/^\(//' | perl -pe 's/^\+\+|^\-\-//' | sort | uniq
[download]

is sufficiently equivalent to

# 68
perl -ne's/^(\(|[+-]{2})//g,say for/(\S{3,80}->\S{5,80})/' *|sort -u
[download]

And since you already assume that you can't have two dereferencing expressions on the same line,

# 67
perl -ne's/^(\(|[+-]{2})//g,say for/\S{3,80}->\S{5,80}/g' *|sort -u
[download]

Comment on Re: Print all derefs and method calls in a directory (Friday golf) Select or Download Code

Replies are listed 'Best First'.
Re^2: Print all derefs and method calls in a directory (Friday golf) by JavaFan (Canon) on Jan 09, 2009 at 12:11 UTC
Since you're using 'say', you have to use '-E' instead of '-e'. Note also that `[+-]{2}` is not equivalent to `\+\+\|--` as the former matches `"-+"` while the latter doesn't. Also, the original code will remove a leading `"(--"` from the line, while your code will not (it will either remove a leading '(' or a leading '--', '-+', '+-' or '--'). Finally, a /g modifier is useless if the pattern is anchored to the beginning of the string. And, if you're golfing, you shouldn't make a capture if you aren't using the result. Your s/// could be written as: `s/^\(?([-+])\1//` [download] My entry (untested): `perl -nE'/\(?([-+])\1.?(\S{3,80}->\S{5,80})/&&say$2' \|sort -u` [download] I do think the 80 is a bit arbitrary, and `perl -nE'/\(?([-+])\1.?(\S{3,}->\S{5,})/&&say$2' \|sort -u` [download] is not only shorter, but likely to be preferred.	[reply] [d/l] [select]
Re^3: Print all derefs and method calls in a directory (Friday golf) by ikegami (Patriarch) on Jan 09, 2009 at 13:03 UTC
Since you're using 'say', you have to use '-E' instead of '-e'. Oops! it will either remove a leading '(' or a leading '--', '-+', '+-' or '--') Oops! `[+-]{2}` is not equivalent to `\+\+\|--` Indeed, but I deemed it acceptable. if you're golfing, you shouldn't make a capture if you aren't using the result. Not until Perl6. `/...(?:...\|...)/` is longer than `/...(...\|...)/`. (Multiplying out the leading subexpression would have been shorter, but that's not the issue you raised.) I take your 69 and give you 51: `perl -nE'/[-+(](\S{3,}->\S{5,})/&&say$1' \|sort -u` [download]	[reply] [d/l] [select]


We don't bite newbies here... much
	PerlMonks