NAME

Smart::Args::TypeTiny - We are smart, smart for you

SYNOPSIS

use Smart::Args::TypeTiny;

sub func2 {
    args my $p => 'Int',
         my $q => {isa => 'Int', optional => 1},
         ;
}
func2(p => 3, q => 4); # p => 3, q => 4
func2(p => 3);         # p => 3, q => undef

sub func3 {
    args my $p => {isa => 'Int', default => 3};
}
func3(p => 4); # p => 4
func3();       # p => 3

package F;
use Moo;
use Smart::Args::TypeTiny;
use Types::Standard -all;

sub method {
    args my $self,
         my $p => Int,
         ;
}
sub class_method {
    args my $class => ClassName,
         my $p     => Int,
         ;
}

sub simple_method {
    args_pos my $self, my $p;
}

my $f = F->new();
$f->method(p => 3);

F->class_method(p => 3);

F->simple_method(3);

DESCRIPTION

Smart::Args::TypeTiny provides Smart::Args-like argument validator using Type::Tiny.

IMCOMPATIBLE CHANGES WITH Smart::Args

Unexpected parameters will be a fatal error

  sub foo {
      args my $x => 'Str';
  }

  sub bar {
      args_pos my $x => 'Str';
  }

  foo(x => 'a', y => 'b'); # fatal: Unexpected parameter 'y' passed
  bar('a', 'b');           # fatal: Too many parameters passed

Optional allows to pass undef to parameter

  sub foo {
      args my $p => {isa => 'Int', optional => 1};
  }

  foo();           # $p = undef
  foo(p => 1);     # $p = 1
  foo(p => undef); # $p = undef

Default parameter can take coderef as lazy value

  sub foo {
      args my $p => {isa => 'Foo', default => create_foo},         # calls every time even if $p is passed
           my $q => {isa => 'Foo', default => sub { create_foo }}, # calls only when $p is not passed
           ;
  }

FUNCTIONS

my $args = args my $var[, $rule], ...;

  sub foo {
      args my $int   => 'Int',
           my $foo   => 'Foo',
           my $bar   => {isa => 'Bar',  default  => sub { Bar->new }},
           my $baz   => {isa => 'Baz',  optional => 1},
           my $bool  => {isa => 'Bool', default  => 0},
           ;

      ...
  }

  foo(int => 1, foo => Foo->new, bool => 1);

Check parameters and fills them into lexical variables. All the parameters are mandatory by default. The hashref of all parameters is returned.

$rule can be any one of type name, Type::Tiny's type constraint object, or hashref have these parameters:

isa Str|Object

Type name or Type::Tiny's type constraint.

Types::Standard
```
  args my $int => {isa => 'Int'};
```

Mouse::Util::TypeConstraints

Enable if Mouse.pm is loaded.

  use Mouse::Util::TypeConstraints;

  subtype 'PositiveInt',
      as 'Int',
      where { $_ > 0 },
      message { 'Must be greater than zero' };

  args my $positive_int => {isa => 'PositiveInt'};

class name

  {
      package Foo;
      ...
  }

  args my $foo => {isa => 'Foo'};

does Str|Object

Role name or Type::Tiny's type constraint object.
optional Bool

The parameter doesn't need to be passed when optional is true.
default Any|CodeRef

Default value for the parameter.

my $args = args_pos my $var[, $rule], ...;

  sub bar {
      args_pos my $x => 'Str',
               my $p => 'Int',
               ;

      ...
  }

  bar('abc', 123);

Same as args except take arguments instead of parameters.

TIPS

SKIP TYPE CHECK

For optimization calling subroutine in runtime type check, you can overwrite check_rule like following code:

{
    no warnings 'redefine';
    sub Smart::Args::TypeTiny::check_rule {
        my ($rule, $value, $exists, $name) = @_;
        return $value;
    }
}

LICENSE

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

AUTHOR

Takumi Akiyama t.akiym@gmail.com

akiym / Smart-Args-TypeTiny