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Re^4: Multi-stage flip-flop? ( till() - proof of concept)

by LanX (Saint)
on Dec 12, 2014 at 03:00 UTC ( [id://1110117]=note: print w/replies, xml ) Need Help??


in reply to Re^3: Multi-stage flip-flop? ( till() - proof of concept)
in thread Multi-stage flip-flop?

Your concept of passing the condition only works when testing a global var like $_ and typechecking is vulnerable in edge cases.¹

I think my concept is more robust and any boolean test can be used.

Sometimes less is more.

use strict; use warnings; use Data::Dump; { my %state; sub till { my @phases=@_; #dd \@_; my ($file,$line)= (caller)[1..2]; my $state = \$state{$file,$line}; $$state //= 0; $phases[1+$$state]->(); if ($phases[$$state]) { $$state += 2; $$state %= @phases; } } } while (my $var = <DATA>){ till ( - ($var =~ /for/) => sub { print "*: $var" }, - ($var =~ /their/) => sub { print "1: $var" }, - ($var =~ /fruit/) => sub { print "2: $var" }, - ($var =~ /lazy/) => sub { print "3: $var" }, ); } __DATA__ now is the time for all good men to come to the aid of their party. Time flies like an arrow fruit flies like a banana. The quick red fox jumps over the lazy brown dog. Etaoinshrdlu.

out

*: now is the time *: for all good men to 1: come to the aid of 1: their party. 2: Time flies like an arrow 2: fruit flies like a banana. 3: The quick red fox 3: jumps over the lazy *: brown dog. *: Etaoinshrdlu.

Cheers Rolf

(addicted to the Perl Programming Language and ☆☆☆☆ :)

¹) What if a test returns a reference for true? Enforcing negation with a unitary minus solves this issue.

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