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proper way to include constants; as module or include file?
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Subject Author Date
proper way to include constants; as module or include file? David Tiberio 10-24-2004
Posted by David Tiberio on October 24, 2004, 10:50 pm
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 I am developing a new perl module that uses constants with regular
expressions. What is the proper way to offer this file?

For example, my perl file is compromised of constants such as the
following:

use constant REGEX_SHELL_DATE =>
b(b(b(Sun|Mon|Tue|Wed|Thu|Fri|Sat)b|b(Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday)b)bsb(b(d|[
0]d|[1][012])b|b(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)b|b(January|February|March|April|May|June|July|August|September|October|November|December)b)bs(d)sb(b([
01]d|2[0-3])b:b([0-5]d)b:b([0-5]d)b)bsb([A-Z])bsb(d|d)b)b;

And a programmer would use my constants like so:

my $date = "Mon Oct 25 11:59:13 EDT 2004";
print $1 if $date =~ /@/;
exit();

Should my file, containing constants, be a module or some sort of
include file? How would the programmer "include" the file? I tried it
as a module, but constants are not naturally accessible from a program
calling the module.


Posted by Jim Keenan on October 26, 2004, 1:49 am
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 David Tiberio wrote:

> I am developing a new perl module that uses constants with regular
> expressions. What is the proper way to offer this file?
>
> For example, my perl file is compromised of constants such as the
> following:
>
> use constant REGEX_SHELL_DATE =>
>
b(b(b(Sun|Mon|Tue|Wed|Thu|Fri|Sat)b|b(Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday)b)bsb(b(d|[
>
0]d|[1][012])b|b(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)b|b(January|February|March|April|May|June|July|August|September|October|November|December)b)bs(d)sb(b([
>
01]d|2[0-3])b:b([0-5]d)b:b([0-5]d)b)bsb([A-Z])bsb(d|d)b)b;
>
> And a programmer would use my constants like so:
>
> my $date = "Mon Oct 25 11:59:13 EDT 2004";
> print $1 if $date =~ /@/;
> exit();
>
> Should my file, containing constants, be a module or some sort of
> include file? How would the programmer "include" the file? I tried it
> as a module, but constants are not naturally accessible from a program
> calling the module.

Please check out the documentation for CPAN distribution Regexp::Common.
You may find that it already provides the functionality you need. If
it doesn't, then continue work on your own module.

jimk


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