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### Re^2: A mini-language for sequences (part 1)

by tmoertel (Chaplain)
 on Mar 11, 2005 at 02:10 UTC ( #438497=note: print w/replies, xml ) Need Help??

in reply to Re: A mini-language for sequences (part 1)
in thread A mini-language for sequences (part 1)

First, thanks for taking the time to do this! The way you broke out the examples is great. It's a much better format for meditation than my original linear flow.

Second, here's a patch that adds seq_concat, which is almost identical to seq_series. (In fact, the patch redefines the latter in terms of the former.)

```diff -urN amlfsp1/ex17.pl amlfsp1.new/ex17.pl
--- amlfsp1/ex17.pl    2005-03-09 15:22:08.000000000 -0500
+++ amlfsp1.new/ex17.pl    2005-03-10 20:53:15.660873854 -0500
@@ -11,5 +11,5 @@

seq(1..3)->seq_map(\&supto)->seq_concat->enumerate;

-#seq(1..3)->seq_concatmap(\&supto)->enumerate;
+seq(1..3)->seq_concatmap(\&supto)->enumerate;

diff -urN amlfsp1/Sequences.pm amlfsp1.new/Sequences.pm
--- amlfsp1/Sequences.pm    2005-03-10 13:38:12.000000000 -0500
+++ amlfsp1.new/Sequences.pm    2005-03-10 20:56:21.166003398 -0500
@@ -101,7 +101,11 @@
}

sub seq_series {
-    my \$seqs = seq( @_ );
+    seq( @_ )->seq_concat;
+}
+
+sub seq_concat {
+    my \$seqs = shift;
my \$seq;
seqsub {
my @val;
@@ -166,19 +170,6 @@
wantarray ? @accum : \$accum[0];
}

-sub seq_concat {  # FIXME: there's probably a slicker way of doing th
+is...
-    my \$seq = shift;
-    my @cache;
-    while (my @seqs = \$seq->()) {
-        foreach my \$s (@seqs) {
-            while (my @vals = \$s->()) {
-                push @cache, @vals;
-            }
-        }
-    }
-    seq(@cache);
-}
-
sub seq_concatmap {
my (\$seq, \$fn) = @_;
\$seq->seq_map(\$fn)->seq_concat;

To apply the patch (on a Unix-esque system), save it into a file, "cd" into the directory containing Sequences.pm, and then run this command: "patch -p1 < patchfile".

Cheers,
Tom

Replies are listed 'Best First'.
Re^3: A mini-language for sequences (part 1)
by trammell (Priest) on Mar 11, 2005 at 03:51 UTC
Excellent! I struggled a bit with seq_concat and seq_concatmap; I'm glad to have more idiomatic versions.

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