RonW:
Here's an alternative, though the syntax isn't as nice as your proposed syntax:
#!/usr/bin/env perl
use strict;
use warnings;
my $fn = \&doOtherProcessing;
while (<DATA>) {
if (/for/) {$fn = \&doStage1}
if (/their/) {$fn = \&doStage2}
if (/fruit/) {$fn = \&doStage3}
if (/lazy/) {$fn = \&doOtherProcessing}
$fn->($_);
}
sub doStage1 { print "1: ",shift }
sub doStage2 { print "2: ",shift }
sub doStage3 { print "3: ",shift }
sub doOtherProcessing { print "*: ",shift }
__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.
Basically we're just using $fn to be a combination state variable / function pointer to track the current state of your chain of comparisons, and selecting a different handler at each match:
*: now is the time
1: for all good men to
1: come to the aid of
2: their party.
2: Time flies like an arrow
3: fruit flies like a banana.
3: The quick red fox
*: jumps over the lazy
*: brown dog.
*: Etaoinshrdlu.
*:
...roboticus
When your only tool is a hammer, all problems look like your thumb.
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