NAME

Sub::Meta::Parameters - meta information about parameters

SYNOPSIS

use Sub::Meta::Parameters;

my $p1 = Sub::Meta::Parameters->new(
    args => ['Str']
);
$p1->invocant;            # => undef;
$p1->invocants;           # => [];
$p1->positional;          # => [Sub::Meta::Param->new('Str')]
$p1->positional_required; # => [Sub::Meta::Param->new('Str')]
$p1->positional_optional; # => []
$p1->named;               # => []
$p1->named_required;      # => []
$p1->named_optional;      # => []
$p1->nshift;              # => 0
$p1->slurpy;              # => 0
$p1->args_min;            # => 1
$p1->args_max;            # => 1


my $x = Sub::Meta::Param->new({ type => 'Int', name => '$x', named => 1 });
my $y = Sub::Meta::Param->new({ type => 'Int', name => '$y', named => 1 });

my $p2 = Sub::Meta::Parameters->new(
    nshift => 1,
    args => [
        'ClassName', $x, $y
    ]
);

$p2->invocant;            # => Sub::Meta::Param->new('ClassName');
$p2->invocants;           # => [Sub::Meta::Param->new('ClassName')];
$p2->positional;          # => []
$p2->positional_required; # => []
$p2->positional_optional; # => []
$p2->named;               # => [$x, $y]
$p2->named_required;      # => [$x, $y]
$p2->named_optional;      # => []
$p2->nshift;              # => 1
$p2->slurpy;              # => 0
$p2->args_min;            # => 5
$p2->args_max;            # => 0+'Inf'

METHODS

new

Constructor of Sub::Meta::Parameters.

my $p = Sub::Meta::Parameters->new(
    args   => ['Str'], # required. arguments
    nshift => 0,       # optional. number of shift arguments
    slurpy => 0,       # optional. whether get all rest arguments
);

ACCESSORS

args

method args() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Subroutine arguments arrayref.

has_args

method has_args() => Bool

Whether Sub::Meta::Parameters has args or not.

set_args

method set_args(ArrayRef[InstanceOf[Sub::Meta::Param]]) => $self
method set_args(ArrayRef[$sub_meta_param_args]) => $self
method set_args(Dict[Str, $sub_meta_param_args]) => $self
method set_args(Ref $type) => $self

Setter for subroutine arguments. An element can be an argument of Sub::Meta::Param.

use Types::Standard -types;

my $p = Sub::Meta::Parameters->new(args => []);
$p->set_args([Int,Int]);
$p->set_args([{ type => Int, name => 'num' }]);

# named case:
$p->set_args({ a => Str, b => Str });
$p->set_args({
    a => { isa => Str, default => 123 },
    b => { isa => Str, optional => 1 }
});

# single ref:
$p->set_args(Str); # => $p->set_args([Str])

all_args

method all_args() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Subroutine invocants and arguments arrayref.

nshift

method nshift() => Enum[0,1]

Number of shift arguments.

set_nshift($nshift)

method nshift(Enum[0,1] $nshift) => $self

Setter for nshift. For example, it is assumed that 1 is specified in the case of methods, and 0 is specified in the case of normal functions.

slurpy

method slurpy() => Maybe[InstanceOf[Sub::Meta::Param]]

Subroutine all rest arguments.

has_slurpy

method has_slurpy() => Bool

Whether Sub::Meta::Parameters has slurpy or not.

set_slurpy($param_args)

method set_slurpy(InstanceOf[Sub::Meta::Param]) => $self> or
method set_slurpy($sub_meta_param_args)> or

Setter for slurpy:

my $p = Sub::Meta::Parameters->new(args => [{ isa => 'Int', name => '$a'}]);
$p->set_slurpy({ name => '@numbers', isa => 'Int' }); # => (Int $a, Int @numbers)

positional

method positional() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Returns an arrayref of parameter objects for the positional arguments.

positional_required

method positional_required() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Returns an arrayref of parameter objects for the required positional arguments.

positional_optional

method positional_optional() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Returns an arrayref of parameter objects for the optional positional arguments.

named

method named() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Returns an arrayref of parameter objects for the named arguments.

named_required

method named_required() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Returns an arrayref of parameter objects for the required named arguments.

named_optional

method named_optional() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Returns an arrayref of parameter objects for the optional named arguments.

invocant

method invocant() => Maybe[InstanceOf[Sub::Meta::Param]]

First element of invocants.

invocants

method invocants() => ArrayRef[InstanceOf[Sub::Meta::Param]]

Returns an arrayref of parameter objects for the variables into which initial arguments are shifted automatically. This will usually return () for normal functions and ('$self') for methods.

has_invocant

method has_invocant() => Bool

Whether Sub::Meta::Parameters has invocant or not.

set_invocant($param_args)

method set_invocant(InstanceOf[Sub::Meta::Param]) => $self
method set_invocant($sub_meta_param_args) => $self

Setter for invocant:

my $invocant = Sub::Meta::Param->new(name => '$self');
my $p = Sub::Meta::Parameters->new(args => []);
$p->set_invocant($invocant);

$p->invocant; # => Sub::Meta::Param->new(name => '$self', invocant => 1);
$p->nshift; # => 1

args_min

method args_min() => NonNegativeInt

Returns the minimum number of required arguments.

This is computed as follows: Invocants and required positional parameters count 1 each. Optional parameters don't count. Required named parameters count 2 each (key + value). Slurpy parameters don't count either because they accept empty lists.

args_max

method args_max() => NonNegativeInt

Returns the maximum number of arguments.

This is computed as follows: If there are any named or slurpy parameters, the result is Inf. Otherwise the result is the number of all invocants and positional parameters.

METHODS

is_same_interface($other_meta)

method is_same_interface(InstanceOf[Sub::Meta::Parameters] $other_meta) => Bool

A boolean value indicating whether Sub::Meta::Parameters object is same or not. Specifically, check whether args, nshift and slurpy are equal.

is_relaxed_same_interface($other_meta)

method is_relaxed_same_interface(InstanceOf[Sub::Meta::Parameters] $other_meta) => Bool

A boolean value indicating whether Sub::Meta::Parameters object is same or not. Specifically, check whether args, nshift and slurpy are satisfy the condition of $self side:

my $meta = Sub::Meta::Parameters->new(args => []);
my $other = Sub::Meta::Parameters->new(args => ["Str"]);
$meta->is_same_interface($other); # NG
$meta->is_relaxed_same_interface($other); # OK. The reason is that $meta does not specify the elements of args.

is_same_interface_inlined($other_meta_inlined)

method is_same_interface_inlined(InstanceOf[Sub::Meta::Parameters] $other_meta) => Str

Returns inlined is_same_interface string.

is_relaxed_same_interface_inlined($other_meta_inlined)

method is_relaxed_same_interface_inlined(InstanceOf[Sub::Meta::Parameters] $other_meta) => Str

Returns inlined is_relaxed_same_interface string.

error_message($other_meta)

method error_message(InstanceOf[Sub::Meta::Parameters] $other_meta) => Str

Return the error message when the interface is not same. If same, then return empty string.

relaxed_error_message($other_meta)

method relaxed_error_message(InstanceOf[Sub::Meta::Parameters] $other_meta) => Str

Return the error message when the interface does not satisfy the $self meta. If match, then return empty string.

display

method display() => Str

Returns the display of Sub::Meta::Parameters:

use Sub::Meta::Parameters;
use Types::Standard qw(Num);
my $meta = Sub::Meta::Parameters->new(
    args => [
        { name => '$lat', type => Num, named => 1 },
        { name => '$lng', type => Num, named => 1 },
    ],
);
$meta->display; # 'Num :$lat, Num :$lng'

OTHERS

param_class

method param_class() => Str

Returns class name of param. default: Sub::Meta::Param Please override for customization.

LICENSE

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

AUTHOR

kfly8 <kfly@cpan.org>

To install Sub::Meta, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Sub::Meta

CPAN shell

perl -MCPAN -e shell
install Sub::Meta

For more information on module installation, please visit the detailed CPAN module installation guide.

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NAME

SYNOPSIS

METHODS

new

ACCESSORS

args

has_args

set_args

all_args

nshift

set_nshift($nshift)

slurpy

has_slurpy

set_slurpy($param_args)

positional

positional_required

positional_optional

named

named_required

named_optional

invocant

invocants

has_invocant

set_invocant($param_args)

args_min

args_max

METHODS

is_same_interface($other_meta)

is_relaxed_same_interface($other_meta)

is_same_interface_inlined($other_meta_inlined)

is_relaxed_same_interface_inlined($other_meta_inlined)

error_message($other_meta)

relaxed_error_message($other_meta)

display

OTHERS

param_class

SEE ALSO

LICENSE

AUTHOR

Module Install Instructions