NAME

FormValidator::Lite - lightweight form validation library

SYNOPSIS

use FormValidator::Lite;

FormValidator::Lite->load_constraints(qw/Japanese/);

my $q = CGI->new();
my $validator = FormValidator::Lite->new($q);
$validator->load_function_message('en');
my $res = $validator->check(
    name => [qw/NOT_NULL/],
    name_kana => [qw/NOT_NULL KATAKANA/],
    {mails => [qw/mail1 mail2/]} => ['DUPLICATION'],
);
if ( ..... return_true_if_error() ..... ) {
    $validator->set_error('login_id' => 'DUPLICATION');
}
if ($validator->has_error) {
    ...
}

# in your template
<ul>
? for my $msg ($validator->get_error_messages) {
    <li><?= $msg ?></li>
? }
</ul>

DESCRIPTION

FormValidator::Lite is a simple, fast implementation for form validation.

IT'S IN BETA QUALITY. API MAY CHANGE IN THE FUTURE.

HOW TO WRITE YOUR OWN CONSTRAINTS

Create your own constraint package as such :

package MyApp::Validator::Constraint;
use strict;
use warnings;
use FormValidator::Lite::Constraint;

rule 'IS_EVEN' => sub {
    return $_ % 2 ? 0 : 1;
};

rule 'IS_GREATER_THAN' => sub {
    my ($min) = @_;
    return $_ >= $min;
}
alias 'IS_GREATER_THAN' => 'IS_BIGGER_THAN';

1;

And in your controller :

use FormValidator::Lite qw("+MyApp::Validator::Constraint");

my $validator = FormValidator::Lite->new(...);
$validator->set_message_data(...);
$validator->check(
    some_param => [ 'UINT', 'IS_EVEN', ['IS_GREATER_THAN' => 42] ],
);

When defining a rule keep in mind that the value for the parameter comes from $_ and the additional arguments defined in your validation specifications come from @_.

METHODS

my $validator = FormValidator::Lite->new($q);

Create a new instance.

The constructor takes a mandatory argument $q that is a query-like object such as Apache::Request, CGI.pm, Plack::Request. The object MUST have a $q->param method.

EXPERIMENTAL: You can pass the hash value for $q.

$validator->query()

$validator->query($query)

Getter/Setter for the query attribute.

$validator->check(@specs_array)

Validate the query against a set of specifications defined in the @specs_array argument. In the most common case, the array is a sequence of pairs : the first item is the parameter name and the second item is an array reference with a list of constraint rules to apply on the query's value for the parameter.

my $res = $validator->check(
    name      => [qw/NOT_NULL/],
    name_kana => [qw/NOT_NULL KATAKANA/],
    {mails => [qw/mail1 mail2/]} => ['DUPLICATION'],
);

In the above example name is a parameter. NOT_NULL, KATAKANA and DUPLICATION are the names of the constraints.

$validator->is_error($key)

Return true value if there is an error for the $key parameter.

$validator->is_valid()

Return true value if $validator didn't detect any error.

This is the same as !$validator->has_error().

$validator->has_error()

Return true value if $validator detects error.

This is the same as !$validator->is_valid().

$validator->set_error($param, $rule_name)

Manually set a new error for the parameter named $param. The rule's name is $rule_name.

$validator->errors()

Return all the errors as a hash reference where the keys are the parameters and the values are a hash reference with the failing constraints.

{
    'foo' => { 'NOT_NULL' => 1, 'INT' => 1 },
    'bar' => { 'EMAIL' => 1, },
}

$validator->load_constraints($name)

$validator->load_constraints("DATE", "Email");

# or load your own constraints
$validator->load_constraints("+MyApp::FormValidator::Lite::Constraint");

You can also load the constraints during import :

use FormValidator::Lite qw/Date Email/;

Load constraint components named "FormValidator::Lite::Constraint::${name}".

$validator->load_function_message($lang)

$validator->load_function_message('ja');

Load function message file.

Currently, FormValidator::Lite::Messages::ja and FormValidator::Lite::Messages::en are available.

$validator->set_param_message($param => $message, ...)

$validator->set_param_message(
    name => 'Your Name',
);

Add a message-friendly description for the parameter.

$validator->set_message("$param.$func" => $message)

$v->set_message('zip.jzip' => 'Please input correct zip number.');

Set an error message for a given $param and $func pair.

$validator->set_message_data({ message => $msg, param => $param, function => $function })

$v->set_message_data(YAML::Load(<<'...'));
---
message:
  zip.jzip: Please input correct zip number.
param:
  name: Your Name
function:
  not_null: "[_1] is empty"
  hiragana: "[_1] is not Hiragana"
...

Set the error message map. In the 'function' and 'message' sections, [_1] will be replaced by build_message with the description of the failing parameter provided in the 'param' section.

$validator->build_message($tmpl, @args)

replace [_1] in $tmpl by @args.

Setup error message map.

$validator->set_message("$param.$func" => $message)

$v->set_message('zip.jzip' => 'Please input correct zip number.');

Note that it will void any previous calls to load_function_message, set_message or set_param_message.

my @errors = $validator->get_error_messages()

my $errors = $validator->get_error_messages()

Get all the error messages for the query. This method returns an array in list context and an array reference otherwise.

my $msg = $validator->get_error_message($param => $func)

Generate the error message for parameter $param and function $func.

my @msgs = $validator->get_error_messages_from_param($param)

Get all the error messages for the parameter $param.

WHY NOT FormValidator::Simple?

Yes, I know. This module is very similar with FV::S.

But, FormValidator::Simple is too heavy for me. FormValidator::Lite is fast!

Perl: 5.010000
FVS: 0.23
FVL: 0.02
                        Rate FormValidator::Simple   FormValidator::Lite
FormValidator::Simple  353/s                    --                  -75%
FormValidator::Lite   1429/s                  304%                    --

AUTHOR

Tokuhiro Matsuno <tokuhirom AAJKLFJEF@ gmail.com>

THANKS TO

craftworks

nekokak

tomi-ru

SEE ALSO

FormValidator::Simple, Data::FormValidator, HTML::FormFu

LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.