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inc/inc_Params-Check/Params/Check.pm  view on Meta::CPAN

(This is particularly useful for more complicated data).

=item array ref

The provided argument MUST equal one of the elements of the array
ref for the validation to pass. An array ref can hold all the above
values.

=back

It returns true if the key matched the criteria, or false otherwise.

=cut

sub allow {
    ### use $_[0] and $_[1] since this is hot code... ###
    #my ($val, $ref) = @_;

    ### it's a regexp ###
    if( ref $_[1] eq 'Regexp' ) {
        local $^W;  # silence warnings if $val is undef #
        return if $_[0] !~ /$_[1]/;

    ### it's a sub ###
    } elsif ( ref $_[1] eq 'CODE' ) {
        return unless $_[1]->( $_[0] );

    ### it's an array ###
    } elsif ( ref $_[1] eq 'ARRAY' ) {

        ### loop over the elements, see if one of them says the
        ### value is OK
        ### also, short-circuit when possible
        for ( @{$_[1]} ) {
            return 1 if allow( $_[0], $_ );
        }

        return;

    ### fall back to a simple, but safe 'eq' ###
    } else {
        return unless _safe_eq( $_[0], $_[1] );
    }

    ### we got here, no failures ###
    return 1;
}

### helper functions ###

sub _safe_eq {
    ### only do a straight 'eq' if they're both defined ###
    return defined($_[0]) && defined($_[1])
                ? $_[0] eq $_[1]
                : defined($_[0]) eq defined($_[1]);
}

sub _who_was_it {
    my $level = $_[0] || 0;

    return (caller(2 + $CALLER_DEPTH + $level))[3] || 'ANON'
}

=head2 last_error()

Returns a string containing all warnings and errors reported during
the last time C<check> was called.

This is useful if you want to report then some other way than
C<carp>'ing when the verbose flag is on.

It is exported upon request.

=cut

{   $_ERROR_STRING = '';

    sub _store_error {
        my($err, $verbose, $offset) = @_[0..2];
        $verbose ||= 0;
        $offset  ||= 0;
        my $level   = 1 + $offset;

        local $Carp::CarpLevel = $level;

        carp $err if $verbose;

        $_ERROR_STRING .= $err . "\n";
    }

    sub _clear_error {
        $_ERROR_STRING = '';
    }

    sub last_error { $_ERROR_STRING }
}

1;

=head1 Global Variables

The behaviour of Params::Check can be altered by changing the
following global variables:

=head2 $Params::Check::VERBOSE

This controls whether Params::Check will issue warnings and
explanations as to why certain things may have failed.
If you set it to 0, Params::Check will not output any warnings.

The default is 1 when L<warnings> are enabled, 0 otherwise;

=head2 $Params::Check::STRICT_TYPE

This works like the C<strict_type> option you can pass to C<check>,
which will turn on C<strict_type> globally for all calls to C<check>.

The default is 0;

=head2 $Params::Check::ALLOW_UNKNOWN

inc/inc_Params-Check/Params/Check.pm  view on Meta::CPAN

the rest on blindly to perhaps another subroutine.

The default is 0;

=head2 $Params::Check::STRIP_LEADING_DASHES

If you set this flag, all keys passed in the following manner:

    function( -key => 'val' );

will have their leading dashes stripped.

=head2 $Params::Check::NO_DUPLICATES

If set to true, all keys in the template that are marked as to be
stored in a scalar, will also be removed from the result set.

Default is false, meaning that when you use C<store> as a template
key, C<check> will put it both in the scalar you supplied, as well as
in the hashref it returns.

=head2 $Params::Check::PRESERVE_CASE

If set to true, L<Params::Check> will no longer convert all keys from
the user input to lowercase, but instead expect them to be in the
case the template provided. This is useful when you want to use
similar keys with different casing in your templates.

Understand that this removes the case-insensitivity feature of this
module.

Default is 0;

=head2 $Params::Check::ONLY_ALLOW_DEFINED

If set to true, L<Params::Check> will require all values passed to be
C<defined>. If you wish to enable this on a 'per key' basis, use the
template option C<defined> instead.

Default is 0;

=head2 $Params::Check::SANITY_CHECK_TEMPLATE

If set to true, L<Params::Check> will sanity check templates, validating
for errors and unknown keys. Although very useful for debugging, this
can be somewhat slow in hot-code and large loops.

To disable this check, set this variable to C<false>.

Default is 1;

=head2 $Params::Check::WARNINGS_FATAL

If set to true, L<Params::Check> will C<croak> when an error during
template validation occurs, rather than return C<false>.

Default is 0;

=head2 $Params::Check::CALLER_DEPTH

This global modifies the argument given to C<caller()> by
C<Params::Check::check()> and is useful if you have a custom wrapper
function around C<Params::Check::check()>. The value must be an
integer, indicating the number of wrapper functions inserted between
the real function call and C<Params::Check::check()>.

Example wrapper function, using a custom stacktrace:

    sub check {
        my ($template, $args_in) = @_;

        local $Params::Check::WARNINGS_FATAL = 1;
        local $Params::Check::CALLER_DEPTH = $Params::Check::CALLER_DEPTH + 1;
        my $args_out = Params::Check::check($template, $args_in);

        my_stacktrace(Params::Check::last_error) unless $args_out;

        return $args_out;
    }

Default is 0;

=head1 Acknowledgements

Thanks to Richard Soderberg for his performance improvements.

=head1 BUG REPORTS

Please report bugs or other issues to E<lt>bug-params-check@rt.cpan.orgE<gt>.

=head1 AUTHOR

This module by Jos Boumans E<lt>kane@cpan.orgE<gt>.

=head1 COPYRIGHT

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


=cut

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