This is probably much more rudimentary than the other responses, but I thought I'd throw it out there. I wrote such a parser a few years ago, and this morning, updated my CPAN module Devel::Examine::Subs to calculate the line numbers where each sub starts and ends.

It's rudimentary because it relies on the fact that each sub must start at the first column of the file, and the closing brace must be in the same position (this means that subs created within other blocks won't get caught).

Here's a script that uses the module, and a snip of some example output:

#!/usr/bin/perl
use warnings; use strict;

use Devel::Examine::Subs;

my $des = Devel::Examine::Subs->new();

my $file = '../business-isp/lib/Business/ISP/Object.pm';

my $subs = $des->sublist({ file => $file });

for my $sub (@$subs){
    
    my $name = $sub->name();
    my $start = $sub->start(); 
    my $end = $sub->stop();
    my $count = $sub->count();

    print "Sub: $name\n\tStart line: $start\n" .
          "\tEnd line: $end\n\tTotal lines: $count\n\n";

}
[download]

Output:

Sub: build_stack
    Start line: 363
    End line: 392
    Total lines: 29

Sub: schema
    Start line: 455
    End line: 511
    Total lines: 56

Sub: new
    Start line: 117
    End line: 207
    Total lines: 90

Sub: DESTROY
    Start line: 767
    End line: 771
    Total lines: 4

Sub: string_to_date
    Start line: 659
    End line: 686
    Total lines: 27

Sub: configure
    Start line: 208
    End line: 300
    Total lines: 92
[download]

-stevieb