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Data::CGIForm is a Perl module with form data interface.

Data::CGIForm is yet another way to parse and handle CGI form data. The main motivation behind this module was a simple specification based validator that could handle multiple values.
You probably dont want to use this module. CGI::Validate is a much more feature complete take on getting this sort of work done. You may then ask why this is on the CPAN, I ask that of myself from time to time....

SYNOPSIS

my %spec = (
username => qr/^([a-z0-9]+)$/,
password => {
regexp => qr/^([a-z0-9+])$/,
filter => [qw(strip_leading_ws, strip_trailing_ws)],
},
email => {
regexp => qr/^([a-z0-9@.]+)$/,
filter => &qualify_domain,
optional => 1,
errors => {
empty => You didnt enter an email address.,
invalid => Bad [% key %]: "[% value %]",
},
extra_test => &check_email_addr,
},
email2 => {
equal_to => email,
errors => {
unequal => Both email addresses must be the same.,
},
},
);

my $r = $ENV{MOD_PERL} ? Apache::Request->instance : CGI->new;

my $form = Data::CGIForm->new(datasource => $r, spec => %spec);


my @params = $form->params;
foreach $param (@params) {
next unless my $error_string = $form->error($param);

print STDERR $error_string;
}

if ($form->error(username)) {
handle_error($form->username, $form->error(username));
}

my $email = $form->param(email);
my $password = $form->password;

Data::Region Perl module can define hierarchical areas with behaviors.

SYNOPSIS

use Data::Region;

$r = Data::Region->new( 8.5, 11, { data => PageObj->new() } );
$r->data( PageObj->new() );

foreach my $c ( $r->subdivide(2.5,3) ) {
$a = $c->area(0.25,0.25, 2.25,2.75);
$a2 = $c->area(0.25,0.25, -0.25,-0.25); # as offset from lower right

($t,$m,$b) = $a->split_vertical(2,5,1); # sequential heights
($t,$m,$b) = $a->split_vertical_abs(0,2,7); # absolute offsets
($l,$r) = $a->split_horizontal(2); # $l gets width of 2, $r gets the rest

my($x1,$y1,$x2,$y2) = $a->coords();
my $data = $a->data(); # data inherits from parent, if not set
$a->action( sub { $data->setfont("Times-Bold", 10);
$data->text($x1,$y1, "Some Text");
$data->line( $_[0]->coords() ); # the non-closure way
} );
}
$r->render(); # heirarchically perform all the actions

# Get some info about a region:
($w,$h) = ( $a->width(), $a->height() );
($x1,$y1, $x2,$y2) = $a->coords();
($x1,$y1) = $a->top_left();
($x2,$y1) = $a->top_right();
($x1,$y2) = $a->bottom_left();
($x2,$y2) = $a->bottom_right();

Data::Region allows you to easily define a set of nested (2-dimensional) areas, defined by related coordinates, and to associate actions with them. The actions can then be performed hierarchically from any root of the tree.

Data::Region was written to provide an easy way to do simple page layout, but has, perhaps, more general uses.

Data::Report provides a framework for flexible reporting.

Data::Report is a flexible, plugin-driven reporting framework. It makes it easy to define reports that can be produced in text, HTML and CSV. Textual ornaments like extra empty lines, dashed lines, and cell lines can be added in a way similar to HTML style sheets.

The Data::Report framework consists of three parts:
The plugins

Plugins implement a specific type of report. Standard plugins provided are Data::Report::Plugin::Text for textual reports, Data::Report::Plugin::Html for HTML reports, and Data::Report::Plugin::Csv for CSV (comma-separated) files.
Users can, and are encouraged, to develop their own plugins to handle different styles and types of reports.

The base class
The base class Data::Report::Base implements the functionality common to all reporters, plus a number of utility functions the plugins can use.

The factory
The actual Data::Report module is a factory that creates a reporter for a given report type by selecting the appropriate plugin and returning an instance thereof.

Data.FormValidators aim is to bring all the benefits of the perl module Data::FormValidator over to javascript, using the same input profiles (they can be dumped into javascript objects using the perl module Data::JavaScript.
Data.FormValidator library lets you define profiles which declare the required and optional fields and any constraints they might have.
The results are provided as an object which makes it easy to handle missing and invalid results, return error messages about which constraints failed, or process the resulting valid data.
IMPORTANT NOTE: JavaScript form validation is NOT a replacement for data validation in your backend scripts. This is the primary reason this module was written... so that it would be easy to share the same validation profile for both the frontend (via Data.FormValidator.js) and backend (via Data::FormValidator.pm).
Enhancements:
- A problem where some functions were not terminated by a semi-colon, so JavaScript compactors would end up creating broken code was fixed.

Data::Stag is a Perl module with structured tags datastructures.

SYNOPSIS

# PROCEDURAL USAGE
use Data::Stag qw(:all);
$doc = stag_parse($file);
@persons = stag_find($doc, "person");
foreach $p (@persons) {
printf "%s, %s phone: %sn",
stag_sget($p, "family_name"),
stag_sget($p, "given_name"),
stag_sget($p, "phone_no"),
;
}

# OBJECT-ORIENTED USAGE
use Data::Stag;
$doc = Data::Stag->parse($file);
@persons = $doc->find("person");
foreach $p (@person) {
printf "%s, %s phone:%sn",
$p->sget("family_name"),
$p->sget("given_name"),
$p->sget("phone_no"),
;
}

This module is for manipulating data as hierarchical tag/value pairs (Structured TAGs or Simple Tree AGgreggates).

Data::Diff is a data structure comparison module.

SYNOPSIS

use Data::Diff qw(diff);

# simple procedural interface to raw difference output
$out = diff( $a, $b );

# OO usage
$diff = Data::Diff->new( $a, $b );

$new = $diff->apply();
$changes = $diff->diff_a();

Data::Diff computes the differences between two abirtray complex data structures.

METHODS

Creation

new Data::Diff( $a, $b, $options )

Creates and retruns a new Data::Diff object with the differences between $a and $b.

Access

apply( $options )

Returns the result of applying one side over the other.

raw()

Returns the internal data structure that describes the differences at all levels within.

Functions

Diff( $a, $b, $options )

Compares the two arguments $a and $b and returns the raw comparison between the two.

EXPORT

Nothing by default but you can choose to export the non-OO function Diff().