Presentation of Perl 5.10 on OSDC.tw 2009, 4/19 by scw

1. Perl 5.10

2. OSDC.tw 2009 4/19
scw at csie dot org

3. Who

4. Who?
Larry Wall
Rafa¨l Garcia-Suarez
e

5. When

6. When?
Perl 5.8.0: July 18, 2002

7. When?
Perl 5.8.0: July 18, 2002
Perl 5.8.9: Dec 14, 2008

8. When?
Perl 5.10.0: Dec 18, 2007

9. When?
Perl 5.10.0: Dec 18, 2007
Perl 6: By Xmas

10. What

11. What?
Compatible (almost)
major upgrade

12. What?
New language features
Interpreter improvements

13. What?
Features and inspiration
from Perl 6

14. Where

15. Where?
Debian 5.0 lenny
Ubuntu 8.10 intrepid
Fedora 9

16. Where?
FreeBSD ports (2009-03-28)
ActivePerl 5.10.0.1004

17. How

18. How?
apt-get install perl
yum update perl

19. How?
portsnap fetch update
cd lang/perl5.10
make install clean

20. How?
portsnap fetch update
cd lang/perl5.10
make install clean
read /usr/ports/UPDATING !!!

22. Not root?

23. Not root!
$ wget http://www.cpan.org/authors/id/
R/RG/RGARCIA/perl-5.10.0.tar.gz
$ tar zxf perl-5.10.0.tar.gz; cd perl-5.10.0
$ ./Configure -Dprefix=/usr/local
˜
-Duserelocatableinc
$ make -j 8 all test install

24. Why

25. a//a

26. a||a

27. Why?
$a // ”Comment?”

28. Why?
$a // ”Comment?”
defined $a ?
$a : ”Comment?”

29. defined-or
Apply defined-or patch against
perl 5.8 works, too

30. defined-or
my $price = mysql select(...)
// ”not found”;
say ”Price at $price”

31. say
say = print + -l
Not enabled by default

32. feature
use feature qw( )
say, switch, state

33. feature
use feature ”:5.10”
use 5.010
use v5.10
perl -E

34. feature
switch
In correct English!!

35. switch
given($foo) {
when (undef) { say ’$foo is undefined’ }
when (”foo”) { say ’$foo is str ”foo”’ }
when ([1,3,5,7,9]) {
say ’$foo is an odd digit’; continue;
}
when ($ < 100) { say ’$foo under 100’ }
when (&func) { say ’func($foo) true’ }
default { die q(I don’t know what to do

36. when
my $count = 0;
for (@array) {
when (”foo”) { ++$count }
}
say ”array contains $count copies of ’foo’”;

37. given, when & default
given(EXPR) = do{ $ = EXPR; ... }
when($foo) = when($ ˜˜$foo)
default = when(1 == 1)

38. smart match
”Smart matching in detail” in perlsyn
$a˜˜$b the same to $b˜˜$a
keys for hash
content for array

39. PerlRE

41. Engine
De-recursivised

42. Engine
Trie

43. Engine
Aho-Corasick

44. Named Capture

45. Named capture
/(?<ip> d+.d+.d+.d+)
.-.-.[(?<time>.*?)]
.”(?<method>GET|POST)
.(?<request>[ˆ ]+)
/x

46. Named capture
/(?<ip> d+.d+.d+.d+)
.-.-.[(?<time>.*?)]
.”(?<method>GET|POST)
.(?<request>[ˆ ]+)
/x
$+{’ip’, ’time’, ’method’, ’request’}

47. backreference
/(.)1/
/(.)g1/
/(.)g{1}/
/(.)g{-1}/
/(?<letter>.)g{letter}/
/(?<letter>.)k<letter>/

48. Regexp::Keep

49. Regexp::Keep
s/(.*)?.*/$1/g

50. Regexp::Keep
s/(.*)?.*/$1/g
s/.*K?.*//g

51. PerlRE not Regular

52. Recursive
/ˆ( # start of line, capture buffer 1
< # match an opening angle brack
(? : # match one of:
[ˆ <>]+ # one or more non angle br
| # ... or ...
(?1) # recurse to bracket 1 and try
)∗ # 0 or more times.
> # match a closing angle bracket
) # end capture buffer one
$/x # end of line

53. Recursive
/ˆ( # start of line, capture buffer 1
< # match an opening angle brack
(? : # match one of:
(? >
[ˆ <>]+ # one or more non angle br
)
| # ... or ...
(?1) # recurse to bracket 1 and try
)∗ # 0 or more times.
> # match a closing angle bracket
) # end capture buffer one
$/x # end of line

54. Recursive
/ˆ( # start of line, capture buffer 1
< # match an opening angle brack
(? : # match one of:
[ˆ <>] + + # one or more non angle b
| # ... or ...
(?1) # recurse to bracket 1 and tr
)∗ # 0 or more times.
> # match a closing angle bracket
) # end capture buffer one
$/x # end of line

55. Backtracking Control Verbs

56. (*FAIL)

57. (*ACCEPT)

58. On (*FAIL)...

59. On (*FAIL)...
(*PRUNE)
estart this trial (:)

60. On (*FAIL)...
aaaaaaaaaaaaaa
/a*(*PRUNE)a/

61. On (*FAIL)...
(*THEN)
ext branch (::)

62. On (*FAIL)...
aaaaaaaaaaaaa
/a*(*THEN)a/

63. On (*FAIL)...
aaaaaaaaaaaaaaaa
/a*(*THEN)a|a+/

64. On (*FAIL)...
(*COMMIT)
ail the match (:::)

65. On (*FAIL)...
aaaaaaaaaaaaaaaa
/a*(*COMMIT)a/

66. demo
parse string

67. man perlre

68. man perldelta

69. Thank you!