NAME
    FormValidator::Simple - validation with simple chains of constraints

SYNOPSIS
        my $query = CGI->new;
        $query->param( param1 => 'ABCD' );
        $query->param( param2 =>  12345 );
        $query->param( mail1  => 'lyo.kato@gmail.com' );
        $query->param( mail2  => 'lyo.kato@gmail.com' );
        $query->param( year   => 2005 );
        $query->param( month  =>   11 );
        $query->param( day    =>   27 );

        my $result = FormValidator::Simple->check( $query => [
            param1 => ['NOT_BLANK', 'ASCII', ['LENGTH', 2, 5]],
            param2 => ['NOT_BLANK', 'INT'  ],
            mail1  => ['NOT_BLANK', 'EMAIL_LOOSE'],
            mail2  => ['NOT_BLANK', 'EMAIL_LOOSE'],
            { mails => ['mail1', 'mail2'       ] } => ['DUPLICATION'],
            { date  => ['year',  'month', 'day'] } => ['DATE'],
        ] );

        if ( $result->has_error ) {
            my $tt = Template->new({ INCLUDE_PATH => './tmpl' });
            $tt->process('template.html', { result => $result });
        }

    template example

        [% IF result.has_error %]
        <p>Found Input Error</p>
        <ul>

            [% IF result.missing('param1') %]
            <li>param1 is blank.</li>
            [% END %]

            [% IF result.invalid('param1') %]
            <li>param1 is invalid.</li>
            [% END %]

            [% IF result.invalid('param1', 'ASCII') %]
            <li>param1 needs ascii code.</li>
            [% END %]

            [% IF result.invalid('param1', 'LENGTH') %]
            <li>input into param1 with characters that's length should be between two and five. </li>
            [% END %]

        </ul>
        [% END %]

    example2

        [% IF result.has_error %]
        <ul>
            [% FOREACH key IN result.error %]
                [% FOREACH type IN result.error(key) %]
                <li>invalid: [% key %] - [% type %]</li>
                [% END %]
            [% END %]
        </ul>
        [% END %]

DESCRIPTION
    This module provides you a sweet way of form data validation with simple
    constraints chains. You can write constraints on single line for each
    input data.

    This idea is based on Sledge::Plugin::Validator, and most of validation
    code is borrowed from this plugin.

    (Sledge is a MVC web application framework: http://sl.edge.jp [Japanese]
    )

    The result object this module returns behaves like
    Data::FormValidator::Results.

HOW TO SET PROFILE
        FormValidator::Simple->check( $q => [
            #profile
        ] );

    Use 'check' method.

    A hash reference includes input data, or an object of some class that
    has a method named 'param', for example CGI, is needed as first
    argument.

    And set profile as array reference into second argument. Profile
    consists of some pairs of input data and constraints.

        my $q = CGI->new;
        $q->param( param1 => 'hoge' );

        FormValidator::Simple->check( $q => [
            param1 => [ ['NOT_BLANK'], ['LENGTH', 4, 10] ],
        ] );

    In this case, param1 is the name of a form element. and the array ref "[
    ['NOT_BLANK']... ]" is a constraints chain.

    Write constraints chain as arrayref, and you can set some constraints
    into it. In the last example, two constraints 'NOT_BLANK', and 'LENGTH'
    are set. Each constraints is should be set as arrayref, but in case the
    constraint has no argument, it can be written as scalar text.

        FormValidator::Simple->check( $q => [
            param1 => [ 'NOT_BLANK', ['LENGTH', 4, 10] ],
        ] );

    Now, in this sample 'NOT_BLANK' constraint is not an arrayref, but
    'LENGTH' isn't. Because 'LENGTH' has two arguments, 4 and 10.

  MULTIPLE DATA VALIDATION
    When you want to check about multiple input data, do like this.

        my $q = CGI->new;
        $q->param( mail1 => 'lyo.kato@gmail.com' );
        $q->param( mail2 => 'lyo.kato@gmail.com' );

        my $result = FormValidator::Simple->check( $q => [
            { mails => ['mail1', 'mail2'] } => [ 'DUPLICATION' ],
        ] )

        [% IF result.invalid('mails') %]
        <p>mail1 and mail2 aren't same.</p>
        [% END %]

    and here's an another example.

        my $q = CGI->new;
        $q->param( year  => 2005 );
        $q->param( month =>   12 );
        $q->param(   day =>   27 );

        my $result = FormValidator::Simple->check( $q => [ 
            { date => ['year', 'month', 'day'] } => [ 'DATE' ],
        ] );

        [% IF result.invalid('date') %]
        <p>Set correct date.</p>
        [% END %]

  FLEXIBLE VALIDATION
        my $valid = FormValidator::Simple->new();

        $valid->check( $q => [ 
            param1 => [qw/NOT_BLANK ASCII/, [qw/LENGTH 4 10/] ],
        ] );

        $valid->check( $q => [
            param2 => [qw/NOT_BLANK/],
        ] );

        my $results = $valid->results;

        if ( found some error... ) {
            $results->set_invalid('param3' => 'MY_ERROR');
        }

    template example

        [% IF results.invalid('param1') %]
        ...
        [% END %]
        [% IF results.invalid('param2') %]
        ...
        [% END %]
        [% IF results.invalid('param3', 'MY_ERROR') %]
        ...
        [% END %]

HOW TO SET OPTIONS
    Option setting is needed by some validation, especially in plugins.

    You can set them in two ways.

        FormValidator::Simple->set_option(
            dbic_base_class => 'MyProj::Model::DBIC',
            charset         => 'euc',
        );

    or

        $valid = FormValidator::Simple->new(
            dbic_base_class => 'MyProj::Model::DBIC',
            charset         => 'euc',
        );

        $valid->check(...)

VALIDATION COMMANDS
    You can use follow variety validations. and each validations can be used
    as negative validation with 'NOT_' prefix.

        FormValidator::Simple->check( $q => [ 
            param1 => [ 'INT', ['LENGTH', 4, 10] ],
            param2 => [ 'NOT_INT', ['NOT_LENGTH', 4, 10] ],
        ] );

    SP  check if the data has space or not.

    INT check if the data is integer or not.

    UINT
        unsigined integer check. for example, if -1234 is input, the
        validation judges it invalid.

    DECIMAL
            $q->param( 'num1' => '123.45678' );

            my $result = FormValidator::Simple->check( $q => [ 
                num1 => [ ['DECIMAL', 3, 5] ],
            ] );

        each numbers (3,5) mean maximum digits before/after '.'

    ASCII
        check is the data consists of only ascii code.

    LENGTH
        check the length of the data.

            my $result = FormValidator::Simple->check( $q => [
                param1 => [ ['LENGTH', 4] ],
            ] );

        check if the length of the data is 4 or not.

            my $result = FormValidator::Simple->check( $q => [
                param1 => [ ['LENGTH', 4, 10] ],
            ] );

        when you set two arguments, it checks if the length of data is in
        the range between 4 and 10.

    HTTP_URL
        verify it is a http(s)-url

            my $result = FormValidator::Simple->check( $q => [
                param1 => [ 'HTTP_URL' ],
            ] );

    SELECTED_AT_LEAST
        verify the quantity of selected parameters is counted over allowed
        minimum.

            <input type="checkbox" name="hobby" value="music" /> Music
            <input type="checkbox" name="hobby" value="movie" /> Movie
            <input type="checkbox" name="hobby" value="game"  /> Game

            my $result = FormValidator::Simple->check( $q => [ 
                hobby => ['NOT_BLANK', ['SELECTED_AT_LEAST', 2] ],
            ] );

    REGEX
        check with regular expression.

            my $result = FormValidator::Simple->check( $q => [ 
                param1 => [ ['REGEX', qr/^hoge$/ ] ],
            ] );

    DUPLICATION
        check if the two data are same or not.

            my $result = FormValidator::Simple->check( $q => [ 
                { duplication_check => ['param1', 'param2'] } => [ 'DUPLICATION' ],
            ] );

    EMAIL
        check with Email::Valid.

    EMAIL_MX
        check with Email::Valid, including mx check.

    EMAIL_LOOSE
        check with Email::Valid::Loose.

    EMAIL_LOOSE_MX
        check with Email::Valid::Loose, including mx check.

    DATE
        check with Date::Calc

            my $result = FormValidator::Simple->check( $q => [ 
                { date => [qw/year month day/] } => [ 'DATE' ]
            ] );

    TIME
        check with Date::Calc

            my $result = FormValidator::Simple->check( $q => [
                { time => [qw/hour min sec/] } => ['TIME'],
            ] );

    DATETIME
        check with Date::Calc

            my $result = FormValidator::Simple->check( $q => [ 
                { datetime => [qw/year month day hour min sec/] } => ['DATETIME']
            ] );

    DATETIME_STRPTIME
        check with DateTime::Format::Strptime.

            my $q = CGI->new;
            $q->param( datetime => '2006-04-26T19:09:21+0900' );

            my $result = FormValidator::Simple->check( $q => [
              datetime => [ [ 'DATETIME_STRPTIME', '%Y-%m-%dT%T%z' ] ],
            ] );

    DATETIME_FORMAT
        check with DateTime::Format::***. for example,
        DateTime::Format::HTTP, DateTime::Format::Mail,
        DateTime::Format::MySQL and etc.

            my $q = CGI->new;
            $q->param( datetime => '2004-04-26 19:09:21' );

            my $result = FormValidator::Simple->check( $q => [
              datetime => [ [qw/DATETIME_FORMAT MySQL/] ],
            ] );

    GREATER_THAN
        numeric comparison

            my $result = FormValidator::Simple->check( $q => [
                age => [ ['GREATER_THAN', 25] ],
            ] );

    LESS_THAN
        numeric comparison

            my $result = FormValidator::Simple->check( $q => [
                age => [ ['LESS_THAN', 25] ],
            ] );

    EQUAL_TO
        numeric comparison

            my $result = FormValidator::Simple->check( $q => [
                age => [ ['EQUAL_TO', 25] ],
            ] );

    BETWEEN
        numeric comparison

            my $result = FormValidator::Simple->check( $q => [
                age => [ ['BETWEEN', 20, 25] ],
            ] );

    ANY check if there is not blank data in multiple data.

            my $result = FormValidator::Simple->check( $q => [ 
                { some_data => [qw/param1 param2 param3/] } => ['ANY']
            ] );

    IN_ARRAY
        check if the food ordered is in menu

            my $result = FormValidator::Simple->check( $q => [
                food => [ ['IN_ARRAY', qw/noodle soba spaghetti/] ],
            ] };

HOW TO LOAD PLUGINS
        use FormValidator::Simple qw/Japanese CreditCard/;

    FormValidator::Simple::Plugin::Japanese,
    FormValidator::Simple::Plugin::CreditCard are loaded.

    or use 'load_plugin' method.

        use FormValidator::Simple;
        FormValidator::Simple->load_plugin('FormValidator::Simple::Plugin::CreditCard');

MESSAGE HANDLING
    You can custom your own message with key and type.

        [% IF result.has_error %]
            [% FOREACH key IN result.error %]
                [% FOREACH type IN result.error(key) %]
                <p>error message:[% type %] - [% key %]</p>
                [% END %]
            [% END %]
        [% END %]

    And you can also set messages configuration before. You can prepare
    configuration as hash reference.

        FormValidator::Simple->set_messages( {
            action1 => {
                name => {
                    NOT_BLANK => 'input name!',
                    LENGTH    => 'input name (length should be between 0 and 10)!',
                },
                email => {
                    DEFAULT => 'input correct email address!',
                },
            },
        } );

    or a YAML file.

        # messages.yml
        DEFAULT:
            name:
                DEFAULT: name is invalid!
        action1:
            name:
                NOT_BLANK: input name!
                LENGTH: input name(length should be between 0 and 10)!
            email:
                DEFAULT: input correct email address!
        action2:
            name:
                DEFAULT: ...
                
    # in your perl-script, set the file's path.
        FormValidator::Simple->set_messages('messages.yml');

    DEFAULT is a special type. If it can't find setting for indicated
    validation-type, it uses message set for DEFAULT.

    after setting, execute check(),

        my $result = FormValidator::Simple->check( $q => [
            name  => [qw/NOT_BLANK/, [qw/LENGTH 0 10/] ],
            email => [qw/NOT_BLANK EMAIL_LOOSE/, [qw/LENGTH 0 20/] ],
        ] );

        # matching result and messages for indicated action.
        my $messages = $result->messages('action1');

        foreach my $message ( @$messages ) {
            print $message, "\n";
        }

    When it can't find indicated action, name, and type, it searches proper
    message from DEFAULT action. If in template file,

        [% IF result.has_error %]
            [% FOREACH msg IN result.messages('action1') %]
            <p>[% msg %]</p>
            [% END %]
        [% END %]

    you can set each message format.

        FormValidator::Simple->set_message_format('<p>%s</p>');
        my $result = FormValidator::Simple->check( $q => [
            ...profile
        ] );

        [% IF result.has_error %]
            [% result.messages('action1').join("\n") %]
        [% END %]

RESULT HANDLING
    See FormValidator::Simple::Results

SEE ALSO
    Data::FormValidator

    http://sl.edge.jp/ (Japanese)

    http://sourceforge.jp/projects/sledge

AUTHOR
    Lyo Kato <lyo.kato@gmail.com>

COPYRIGHT AND LICENSE
    This library is free software. You can redistribute it and/or modify it
    under the same terms as perl itself.