man Attribute::Params::Validate () - Validate method/function parameters using attributes

NAME

Attribute::Params::Validate - Validate method/function parameters using attributes

SYNOPSIS

  use Attribute::Params::Validate qw(:all);


  # takes named params (hash or hashref)
  # foo is mandatory, bar is optional
  sub foo : Validate( foo => 1, bar => 0 )
  {
      ...
  }


  # takes positional params
  # first two are mandatory, third is optional
  sub bar : ValidatePos( 1, 1, 0 )
  {
      ...
  }


  # for some reason Perl insists that the entire attribute be on one line
  sub foo2 : Validate( foo => { type => ARRAYREF }, bar => { can => [ 'print', 'flush', 'frobnicate' ] }, baz => { type => SCALAR, callbacks => { 'numbers only' => sub { shift() =~ /^\d+$/ }, 'less than 90' => sub { shift() < 90 } } } )
  {
      ...
  }


  # note that this is marked as a method.  This is very important!
  sub baz : Validate( foo => { type => ARRAYREF }, bar => { isa => 'Frobnicator' } ) method
  {
      ...
  }

DESCRIPTION

The Attribute::Params::Validate module allows you to validate method or function call parameters just like Params::Validate does. However, this module allows you to specify your validation spec as an attribute, rather than by calling the CWvalidate routine.

Please see Params::Validate for more information on how you can specify what validation is performed.

EXPORT

This module exports everthing that Params::Validate does except for the CWvalidate and CWvalidate_pos subroutines.

ATTRIBUTES

* Validate
This attribute corresponse to the CWvalidate subroutine in Params::Validate.
* ValidatePos
This attribute corresponse to the CWvalidate_pos subroutine in Params::Validate.

OO

If you are using this module to mark methods for validation, as opposed to subroutines, it is crucial that you mark these methods with the CW:method attribute, as well as the CWValidate or CWValidatePos attribute.

If you do not do this, then the object or class used in the method call will be passed to the validation routines, which is probably not what you want.

CAVEATS

You must put all the arguments to the CWValidate or CWValidatePos attribute on a single line, or Perl will complain.

SEE ALSO

Params::Validate

AUTHOR

Dave Rolsky, <autarch@urth.org>