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package Specio::Constraint::Role::Interface;
use strict;
use warnings;
our $VERSION = '0.42';
use Carp qw( confess );
use Eval::Closure qw( eval_closure );
use List::Util 1.33 qw( all any first );
use Specio::Exception;
use Specio::PartialDump qw( partial_dump );
use Specio::TypeChecks qw( is_CodeRef );
use Role::Tiny 1.003003;
use Specio::Role::Inlinable;
with 'Specio::Role::Inlinable';
use overload(
q{""} => sub { $_[0] },
'&{}' => '_subification',
'bool' => sub {1},
);
{
## no critic (Subroutines::ProtectPrivateSubs)
my $role_attrs = Specio::Role::Inlinable::_attrs();
## use critic
my $attrs = {
%{$role_attrs},
name => {
isa => 'Str',
predicate => '_has_name',
},
parent => {
does => 'Specio::Constraint::Role::Interface',
predicate => '_has_parent',
},
_constraint => {
isa => 'CodeRef',
init_arg => 'constraint',
predicate => '_has_constraint',
},
_optimized_constraint => {
isa => 'CodeRef',
init_arg => undef,
lazy => 1,
builder => '_build_optimized_constraint',
},
_ancestors => {
isa => 'ArrayRef',
init_arg => undef,
lazy => 1,
builder => '_build_ancestors',
},
_message_generator => {
isa => 'CodeRef',
init_arg => undef,
},
_coercions => {
builder => '_build_coercions',
clone => '_clone_coercions',
},
_subification => {
init_arg => undef,
lazy => 1,
builder => '_build_subification',
},
# Because types are cloned on import, we can't directly compare type
# objects. Because type names can be reused between packages (no global
# registry) we can't compare types based on name either.
_signature => {
isa => 'Str',
init_arg => undef,
lazy => 1,
builder => '_build_signature',
},
};
## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
sub _attrs {
return $attrs;
}
}
my $NullConstraint = sub {1};
# See Specio::OO to see how this is used.
## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
sub _Specio_Constraint_Role_Interface_BUILD {
my $self = shift;
my $p = shift;
unless ( $self->_has_constraint || $self->_has_inline_generator ) {
$self->{_constraint} = $NullConstraint;
}
die
'A type constraint should have either a constraint or inline_generator parameter, not both'
if $self->_has_constraint && $self->_has_inline_generator;
$self->{_message_generator}
= $self->_wrap_message_generator( $p->{message_generator} );
return;
}
## use critic
sub _wrap_message_generator {
my $self = shift;
my $generator = shift;
unless ( defined $generator ) {
$generator = sub {
my $description = shift;
my $value = shift;
return "Validation failed for $description with value "
. partial_dump($value);
};
}
my $d = $self->description;
return sub { $generator->( $d, @_ ) };
}
sub coercions { values %{ $_[0]->{_coercions} } }
sub coercion_from_type { $_[0]->{_coercions}{ $_[1] } }
sub _has_coercion_from_type { exists $_[0]->{_coercions}{ $_[1] } }
sub _add_coercion { $_[0]->{_coercions}{ $_[1] } = $_[2] }
sub has_coercions { scalar keys %{ $_[0]->{_coercions} } }
sub validate_or_die {
my $self = shift;
my $value = shift;
return if $self->value_is_valid($value);
Specio::Exception->throw(
message => $self->_message_generator->($value),
type => $self,
value => $value,
);
}
sub value_is_valid {
my $self = shift;
my $value = shift;
return $self->_optimized_constraint->($value);
}
sub _ancestors_and_self {
my $self = shift;
return ( ( reverse @{ $self->_ancestors } ), $self );
}
sub is_a_type_of {
my $self = shift;
my $type = shift;
return any { $_->_signature eq $type->_signature }
$self->_ancestors_and_self;
}
sub is_same_type_as {
my $self = shift;
my $type = shift;
return $self->_signature eq $type->_signature;
}
sub is_anon {
my $self = shift;
return !$self->_has_name;
}
sub has_real_constraint {
my $self = shift;
return ( $self->_has_constraint && $self->_constraint ne $NullConstraint )
|| $self->_has_inline_generator;
}
sub can_be_inlined {
my $self = shift;
return 1 if $self->_has_inline_generator;
return 0
if $self->_has_constraint && $self->_constraint ne $NullConstraint;
# If this type is an empty subtype of an inlinable parent, then we can
# inline this type as well.
return 1 if $self->_has_parent && $self->parent->can_be_inlined;
return 0;
}
sub _build_generated_inline_sub {
my $self = shift;
my $type = $self->_self_or_first_inlinable_ancestor;
my $source
= 'sub { ' . $type->_inline_generator->( $type, '$_[0]' ) . '}';
return eval_closure(
source => $source,
environment => $type->inline_environment,
description => 'inlined sub for ' . $self->description,
);
}
sub _self_or_first_inlinable_ancestor {
my $self = shift;
my $type = first { $_->_has_inline_generator }
reverse $self->_ancestors_and_self;
# This should never happen because ->can_be_inlined should always be
# checked before this builder is called.
die 'Cannot generate an inline sub' unless $type;
return $type;
}
sub _build_optimized_constraint {
my $self = shift;
if ( $self->can_be_inlined ) {
return $self->_generated_inline_sub;
}
else {
return $self->_constraint_with_parents;
}
}
sub _constraint_with_parents {
my $self = shift;
my @constraints;
for my $type ( $self->_ancestors_and_self ) {
next unless $type->has_real_constraint;
# If a type can be inlined, we can use that and discard all of the
# ancestors we've seen so far, since we can assume that the inlined
# constraint does all of the ancestor checks in addition to its own.
if ( $type->can_be_inlined ) {
@constraints = $type->_generated_inline_sub;
}
else {
push @constraints, $type->_constraint;
}
}
return $NullConstraint unless @constraints;
return sub {
all { $_->( $_[0] ) } @constraints;
};
}
# This is only used for identifying from types as part of coercions, but I
# want to leave open the possibility of using something other than
# _description in the future.
sub id {
my $self = shift;
return $self->description;
}
sub add_coercion {
my $self = shift;
my $coercion = shift;
my $from_id = $coercion->from->id;
confess "Cannot add two coercions fom the same type: $from_id"
if $self->_has_coercion_from_type($from_id);
$self->_add_coercion( $from_id => $coercion );
return;
}
sub has_coercion_from_type {
my $self = shift;
my $type = shift;
return $self->_has_coercion_from_type( $type->id );
}
sub coerce_value {
my $self = shift;
my $value = shift;
for my $coercion ( $self->coercions ) {
next unless $coercion->from->value_is_valid($value);
return $coercion->coerce($value);
}
return $value;
}
sub can_inline_coercion {
my $self = shift;
return all { $_->can_be_inlined } $self->coercions;
}
sub can_inline_coercion_and_check {
my $self = shift;
return all { $_->can_be_inlined } $self, $self->coercions;
}
sub inline_coercion {
my $self = shift;
my $arg_name = shift;
die 'Cannot inline coercion'
unless $self->can_inline_coercion;
my $source = 'do { my $value = ' . $arg_name . ';';
my ( $coerce, $env );
( $coerce, $arg_name, $env ) = $self->_inline_coercion($arg_name);
$source .= $coerce . $arg_name . '};';
return ( $source, $env );
}
sub inline_coercion_and_check {
my $self = shift;
my $arg_name = shift;
die 'Cannot inline coercion and check'
unless $self->can_inline_coercion_and_check;
my $source = 'do { my $value = ' . $arg_name . ';';
my ( $coerce, $env );
( $coerce, $arg_name, $env ) = $self->_inline_coercion($arg_name);
my ( $assert, $assert_env ) = $self->inline_assert($arg_name);
$source .= $coerce;
$source .= $assert;
$source .= $arg_name . '};';
return ( $source, { %{$env}, %{$assert_env} } );
}
sub _inline_coercion {
my $self = shift;
my $arg_name = shift;
return ( q{}, $arg_name, {} ) unless $self->has_coercions;
my %env;
$arg_name = '$value';
my $source = $arg_name . ' = ';
for my $coercion ( $self->coercions ) {
$source
.= '('
. $coercion->from->inline_check($arg_name) . ') ? ('
. $coercion->inline_coercion($arg_name) . ') : ';
%env = (
%env,
%{ $coercion->inline_environment },
%{ $coercion->from->inline_environment },
);
}
$source .= $arg_name . ';';
return ( $source, $arg_name, \%env );
}
{
my $counter = 1;
sub inline_assert {
my $self = shift;
my $type_var_name = '$_Specio_Constraint_Interface_type' . $counter;
my $message_generator_var_name
= '$_Specio_Constraint_Interface_message_generator' . $counter;
my %env = (
$type_var_name => \$self,
$message_generator_var_name => \( $self->_message_generator ),
%{ $self->inline_environment },
);
my $source = $self->inline_check( $_[0] );
$source .= ' or ';
$source .= $self->_inline_throw_exception(
$_[0],
$message_generator_var_name,
$type_var_name
);
$source .= ';';
$counter++;
return ( $source, \%env );
}
}
sub inline_check {
my $self = shift;
die 'Cannot inline' unless $self->can_be_inlined;
my $type = $self->_self_or_first_inlinable_ancestor;
return $type->_inline_generator->( $type, @_ );
}
# For some idiotic reason I called $type->_subify directly in Code::TidyAll so
# I'll leave this in here for now.
## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
sub _subify { $_[0]->_subification }
## use critic
sub _build_subification {
my $self = shift;
if ( defined &Sub::Quote::quote_sub && $self->can_be_inlined ) {
return Sub::Quote::quote_sub( $self->inline_assert('$_[0]') );
}
else {
return sub { $self->validate_or_die( $_[0] ) };
}
}
sub _inline_throw_exception {
my $self = shift;
my $value_var = shift;
my $message_generator_var_name = shift;
my $type_var_name = shift;
#<<<
return 'Specio::Exception->throw( '
. ' message => ' . $message_generator_var_name . '->(' . $value_var . '),'
. ' type => ' . $type_var_name . ','
. ' value => ' . $value_var . ' )';
#>>>
}
# This exists for the benefit of Moo
sub coercion_sub {
my $self = shift;
if ( defined &Sub::Quote::quote_sub
&& all { $_->can_be_inlined } $self->coercions ) {
my $inline = q{};
my %env;
for my $coercion ( $self->coercions ) {
$inline .= sprintf(
'$_[0] = %s if %s;' . "\n",
$coercion->inline_coercion('$_[0]'),
$coercion->from->inline_check('$_[0]')
);
%env = (
%env,
%{ $coercion->inline_environment },
%{ $coercion->from->inline_environment },
);
}
$inline .= sprintf( "%s;\n", '$_[0]' );
return Sub::Quote::quote_sub( $inline, \%env );
}
else {
return sub { $self->coerce_value(shift) };
}
}
sub _build_ancestors {
my $self = shift;
my @parents;
my $type = $self;
while ( $type = $type->parent ) {
push @parents, $type;
}
return \@parents;
}
sub _build_description {
my $self = shift;
my $desc
= $self->is_anon ? 'anonymous type' : 'type named ' . $self->name;
$desc .= q{ } . $self->declared_at->description;
return $desc;
}
sub _build_coercions { {} }
## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
sub _clone_coercions {
my $self = shift;
my $coercions = $self->_coercions;
my %clones;
for my $name ( keys %{$coercions} ) {
my $coercion = $coercions->{$name};
$clones{$name} = $coercion->clone_with_new_to($self);
}
return \%clones;
}
## use critic
sub _build_signature {
my $self = shift;
# This assumes that when a type is cloned, the underlying constraint or
# generator sub is copied by _reference_, so it has the same memory
# address and stringifies to the same value. XXX - will this break under
# threads?
return join "\n",
( $self->_has_parent ? $self->parent->_signature : () ),
(
defined $self->_constraint
? $self->_constraint
: $self->_inline_generator
);
}
# Moose compatibility methods - these exist as a temporary hack to make Specio
# work with Moose.
sub has_coercion {
shift->has_coercions;
}
## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
sub _inline_check {
shift->inline_check(@_);
}
sub _compiled_type_constraint {
shift->_optimized_constraint;
}
## use critic;
# This class implements the methods that Moose expects from coercions as well.
sub coercion {
return shift;
}
## no critic (Subroutines::ProhibitUnusedPrivateSubroutines)
sub _compiled_type_coercion {
my $self = shift;
return sub {
return $self->coerce_value(shift);
};
}
## use critic
sub has_message {
1;
}
sub message {
shift->_message_generator;
}
sub get_message {
my $self = shift;
my $value = shift;
return $self->_message_generator->( $self, $value );
}
sub check {
shift->value_is_valid(@_);
}
sub coerce {
shift->coerce_value(@_);
}
1;
# ABSTRACT: The interface all type constraints should provide
__END__
=pod
=encoding UTF-8
=head1 NAME
Specio::Constraint::Role::Interface - The interface all type constraints should provide
=head1 VERSION
version 0.42
=head1 DESCRIPTION
This role defines the interface that all type constraints must provide, and
provides most (or all) of the implementation. The L<Specio::Constraint::Simple>
class simply consumes this role and provides no additional code. Other
constraint classes add features or override some of this role's functionality.
=for Pod::Coverage .*
=head1 API
See the L<Specio::Constraint::Simple> documentation for details. See the
internals of various constraint classes to see how this role can be overridden
or expanded upon.
=head1 ROLES
This role does the L<Specio::Role::Inlinable> role.
=head1 SUPPORT
Bugs may be submitted at L<https://github.com/houseabsolute/Specio/issues>.
I am also usually active on IRC as 'autarch' on C<irc://irc.perl.org>.
=head1 SOURCE
The source code repository for Specio can be found at L<https://github.com/houseabsolute/Specio>.
=head1 AUTHOR
Dave Rolsky <autarch@urth.org>
=head1 COPYRIGHT AND LICENSE
This software is Copyright (c) 2012 - 2017 by Dave Rolsky.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)
The full text of the license can be found in the
F<LICENSE> file included with this distribution.
=cut