From 040328d0b0e2e528e06ba9e7f49cbaa38697ff9e Mon Sep 17 00:00:00 2001
From: 冯昶 <fengchang@novel-supertv.com>
Date: Sat, 20 Jul 2019 19:55:56 +0800
Subject: challenge 017

---
 challenge-017/feng-chang/perl5/ch-1.pl | 27 +++++++++++++++++
 challenge-017/feng-chang/perl5/ch-2.pl | 36 +++++++++++++++++++++++
 challenge-017/feng-chang/perl6/ch-1.p6 | 22 ++++++++++++++
 challenge-017/feng-chang/perl6/ch-2.p6 | 53 ++++++++++++++++++++++++++++++++++
 4 files changed, 138 insertions(+)
 create mode 100755 challenge-017/feng-chang/perl5/ch-1.pl
 create mode 100755 challenge-017/feng-chang/perl5/ch-2.pl
 create mode 100755 challenge-017/feng-chang/perl6/ch-1.p6
 create mode 100755 challenge-017/feng-chang/perl6/ch-2.p6

diff --git a/challenge-017/feng-chang/perl5/ch-1.pl b/challenge-017/feng-chang/perl5/ch-1.pl
new file mode 100755
index 0000000000..560139c16e
--- /dev/null
+++ b/challenge-017/feng-chang/perl5/ch-1.pl
@@ -0,0 +1,27 @@
+#!/bin/env perl
+
+use Modern::Perl;
+
+say "A(0,$_) ", A(0, $_) for 0..9;
+say "A(1,$_) ", A(1, $_) for 0..9;
+say "A(2,$_) ", A(2, $_) for 0..9;
+say "A(3,$_) ", A(3, $_) for 0..9;
+
+my @pool;
+
+sub A {
+    my ($m, $n) = @_;
+    die "parameter less than 0\n" if $m < 0 or $n < 0;
+
+    return $pool[$m][$n] if defined $pool[$m][$n];
+
+    if ($m == 0) {
+        $pool[0][$n] = $n + 1;
+    } elsif ($n == 0) {
+        $pool[$m][0] = A($m - 1, 1);
+    } else {
+        $pool[$m][$n] = A($m - 1, A($m, $n - 1));
+    }
+
+    return $pool[$m][$n];
+}
diff --git a/challenge-017/feng-chang/perl5/ch-2.pl b/challenge-017/feng-chang/perl5/ch-2.pl
new file mode 100755
index 0000000000..a1f542e831
--- /dev/null
+++ b/challenge-017/feng-chang/perl5/ch-2.pl
@@ -0,0 +1,36 @@
+#!/bin/env perl 
+
+use Modern::Perl;
+
+my $s = 'jdbc:mysql://user:password@localhost:3306/pwc?profile=true#h1';
+
+#       scheme:[//[userinfo@]host[:port]]path[?query][#fragment]
+# e.g.: jdbc:mysql://user:password@localhost:3306/pwc?profile=true#h1
+if ($s =~ m/^
+            (?<scheme> [a-zA-Z][-+.a-zA-Z0-9]* (?: : [a-zA-Z][-+.a-zA-Z0-9]*)? )
+            : (?: \/\/
+                  (?:
+                      (?<userinfo>
+                          (?<user>     [a-z][-+.a-zA-Z0-9]*) :
+                          (?<password> [-+.a-zA-Z0-9]*)
+                      )
+                      @
+                  )?
+                  (?<host> [a-zA-Z0-9][-+.a-zA-Z0-9]*) 
+                  (?: : (?<port> \d+) )?
+              )?
+            (?<path> \/ (?: \w+? \/? )* )
+            (?: \? (?<query> [a-zA-Z][-+.a-zA-Z0-9]* = \w+ (?: & [a-zA-Z][-+.a-zA-Z0-9]* = \w+)* ))?
+            (?: \# (?<fragment> [a-zA-Z][-+.a-zA-Z0-9]*))?
+        $/x
+   ) {
+    say 'scheme:   ',   $+{ scheme };
+    say 'userinfo: ',   $+{ userinfo } if defined $+{ userinfo };
+    #say '  user:     ', $+{ user }     if defined $+{ user };
+    #say '  password: ', $+{ password } if defined $+{ password };
+    say 'host:     ',   $+{ host }     if defined $+{ host };
+    say 'port:     ',   $+{ port }     if defined $+{ port };
+    say 'path:     ',   $+{ path };
+    say 'query:    ',   $+{ query }    if defined $+{ query };
+    say 'fragment: ',   $+{ fragment } if defined $+{ fragment };
+}
diff --git a/challenge-017/feng-chang/perl6/ch-1.p6 b/challenge-017/feng-chang/perl6/ch-1.p6
new file mode 100755
index 0000000000..9081f56910
--- /dev/null
+++ b/challenge-017/feng-chang/perl6/ch-1.p6
@@ -0,0 +1,22 @@
+#!/bin/env perl6
+
+my @pool;
+
+say "A(0,$_) ", A(0, $_) for 0..9;
+say "A(1,$_) ", A(1, $_) for 0..9;
+say "A(2,$_) ", A(2, $_) for 0..9;
+say "A(3,$_) ", A(3, $_) for 0..9;
+
+sub A(UInt $m, UInt $n) returns UInt {
+    return @pool[$m][$n] if @pool[$m][$n].defined;
+
+    if $m == 0 {
+        @pool[0][$n] = $n + 1;
+    } elsif $n == 0 {
+        @pool[$m][0] = A($m - 1, 1);
+    } else {
+        @pool[$m][$n] = A($m - 1, A($m, $n - 1));
+    }
+
+    return @pool[$m][$n];
+}
diff --git a/challenge-017/feng-chang/perl6/ch-2.p6 b/challenge-017/feng-chang/perl6/ch-2.p6
new file mode 100755
index 0000000000..e9c140a149
--- /dev/null
+++ b/challenge-017/feng-chang/perl6/ch-2.p6
@@ -0,0 +1,53 @@
+#!/bin/env perl6
+
+# scheme:[//[userinfo@]host[:port]]path[?query][#fragment]
+grammar URL {
+    token TOP { ^
+        <scheme> ':' 
+        [ '//'
+            [ <userinfo> '@' ]?
+            <host>
+            [ ':' <port> ]?
+        ]?
+        <path>
+        [ '?' <queries> ]?
+        [ '#' <fragment> ]?
+    $ }
+
+    token       scheme { <id> }
+
+    token     userinfo { <user> [ ':' <password> ]? }
+    token         user { <id> }
+    token     password { \w+ }
+
+    token         host { [ <IPv4-address> | <domain-name> ] }
+    token IPv4-address { [\d ** 1..3] ** 4 % '.' }
+    token        dname { <[a..zA..Z]> <[-a..zA..Z0..9]>* }
+    token  domain-name { <dname>+ % '.' }
+
+    token         port { \d+ }
+
+    token         path { '/' [<[a..zA..Z0..9]>+] *%% '/' }
+
+    token          key { <id> }
+    token        value { \w+ }
+    token        query { <key> '=' <value> }
+    token      queries { <query> +% '&' }
+
+    token     fragment { <id> }
+
+    token           id { <[a..zA..Z]> <[-+.a..zA..Z0..9]>* }
+}
+
+sub MAIN(Str $url = 'jdbc://user:password@localhost:3306/pwc?profile=true#h1') {
+    my $m = URL.parse($url);
+    if $m {
+        say 'scheme:   ', ~$m<scheme>;
+        say 'userinfo: ', ~$m<userinfo> if $m<userinfo>;
+        say 'host:     ', ~$m<host>     if $m<host>;
+        say 'port:     ', ~$m<port>     if $m<port>;
+        say 'path:     ', ~$m<path>;
+        say 'query:    ', ~$m<queries>  if $m<queries>;
+        say 'fragment: ', ~$m<fragment> if $m<fragment>;
+    }
+}
-- 
cgit