X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=moose-class%2Fslides%2Findex.html;h=98e190a312cc6d8648c6f7a310e8299b57c392fb;hb=ba3e6f3b43767d159a22c4884f0a7e3720bda4c2;hp=81db5110e0c836e97fb4fda9c219c3cf00c5d3b9;hpb=4a2daaa5e6a7a78149d61c25aee24eae9031e11b;p=gitmo%2Fmoose-presentations.git
diff --git a/moose-class/slides/index.html b/moose-class/slides/index.html
index 81db511..98e190a 100644
--- a/moose-class/slides/index.html
+++ b/moose-class/slides/index.html
@@ -40,7 +40,7 @@ img#me05 {top: 43px;left: 36px;}
@@ -888,7 +901,6 @@ sub BUILDARGS {
if ( @_ == 1 && ! ref $_[0] ) {
return { ssn => $_[0] };
}
-
return $class->SUPER::BUILDARGS(@_);
}
@@ -940,7 +952,7 @@ sub BUILD {
-
The Object is Oqaque
+
The Object is Opaque
- Technically it's a hash reference
@@ -962,6 +974,8 @@ sub BUILD {
extends is sugar for declaring parent classes- Also ensures metaclass compatibility between parent and child
+ - Do not
use base
package Employee;
@@ -1029,7 +1043,8 @@ use Moose;
override work => sub {
my $self = shift;
- die "Pay me first" unless $self->got_paid;
+ die "Pay me first"
+ unless $self->got_paid;
super();
};
no Moose at the end of a package is a best practice- Or
use namespace::autoclean at the top
- Just do it
@@ -1187,13 +1203,15 @@ use Moose;
Exercises
# cd exercises
-# perl install-moose (if needed)
+
# perl bin/prove -lv t/00-prereq.t
-Missing anything? Install it. (see tarballs/)
+# perl install-moose (if needed)
# perl bin/prove -lv t/01-classes.t
+# edit lib/Person.pm and lib/Employee.pm
+
Iterate til this passes all its tests
@@ -1211,11 +1229,10 @@ Iterate til this passes all its tests
-
Roles Can Have State and Behavior
+
Roles - State and Behavior
package HasPermissions;
use Moose::Role;
-
# state
has access_level => ( is => 'rw' );
@@ -1224,7 +1241,8 @@ sub can_access {
my $self = shift;
my $required = shift;
- return $self->access_level >= $required;
+ return $self->access_level
+ >= $required;
}
Classes Consume Roles
my $person = Person->new(
- first_name => 'Kenichi',
- last_name => 'Asai',
+ first_name => 'Kenichi',
+ last_name => 'Asai',
access_level => 42,
);
@@ -1325,7 +1343,7 @@ sub print {
# or ...
-if ( Person->meta->does('Printable') ) { ... }
+Person->meta->does('Printable')
@@ -1391,10 +1409,10 @@ use Moose;
use Moose;
with 'IsFragile' =>
- { alias =>
+ { -alias =>
{ break => 'break_bone' } },
'CanBreakdance' =>
- { alias =>
+ { -alias =>
{ break => 'break_it_down' } };
@@ -1410,13 +1428,13 @@ use Moose;
use Moose;
with 'IsFragile' =>
- { alias =>
+ { -alias =>
{ break => 'break_bone' },
- exclude => 'break' },
+ -excludes => 'break' },
'CanBreakdance' =>
- { alias =>
- { break => 'break_dance' },
- exclude => 'break' };
+ { -alias =>
+ { break => 'break_it_down' },
+ -excludes => 'break' };
@@ -1428,7 +1446,7 @@ use Moose;
sub break {
my $self = shift;
- $self->break_dance;
+ $self->break_it_down;
if ( rand(1) < 0.5 ) {
$self->break_bone;
}
@@ -1589,7 +1607,8 @@ has [ 'left', 'right' ] => (
use Moose::Util qw( apply_all_roles );
my $fragile_person = Person->new( ... );
-apply_all_roles( $fragile_person, 'IsFragile' );
+apply_all_roles( $fragile_person,
+ 'IsFragile' );
- Does not change the
Person class
@@ -1752,7 +1771,7 @@ Person->new(); # kaboom
- Attributes can have defaults
- - Simple non-referecne scalars (number, string)
+ - Simple non-reference scalars (number, string)
- Subroutine reference
- A builder method
@@ -1793,7 +1812,7 @@ has bank => (
-
Default as a Subroutine Reference
+
Subroutine Reference Default
- Called as a method on the object
@@ -1866,7 +1885,8 @@ has bank => (
sub _build_bank {
my $self = shift;
- return Bank->new( name => 'Spire FCU' );
+ return Bank->new(
+ name => 'Spire FCU' );
}
-
Lazy, Good for Nothing Attributes
+
Lazy, Good for Nothin' Attributes
- Normally, defaults are generated during object construction
@@ -2189,7 +2209,8 @@ has first_name => (
Exercises
# cd exercises
-# perl bin/prove -lv t/03-basic-attributes.t
+# perl bin/prove -lv \
+ t/03-basic-attributes.t
Iterate til this passes all its tests
-
Other Uses Example
+
More Modifier Examples
has password => (
is => 'rw',
clearer => 'clear_password',
);
-
has hashed_password => (
is => 'ro',
builder => '_build_hashed_password',
clearer => '_clear_hashed_password',
);
-
after clear_password => sub {
my $self = shift;
$self->_clear_hashed_password;
@@ -2343,7 +2363,6 @@ after clear_password => sub {
$self->_munge_insert(@_) );
$new_user->_assign_uri;
-
return $new_user;
};
Modifier Order
- - Before runs order from last to first
+ - Before runs in order from last to first
- After runs in order from first to last
- Around runs in order from last to first
@@ -2421,13 +2440,11 @@ sub xml { '<doc>' . inner() . '</doc>
package Report;
extends 'Document';
-
augment xml =>
sub { title() . inner() . summary() };
package TPSReport;
extends 'Report';
-
augment xml =>
sub { tps_xml() . inner() };
@@ -2508,7 +2525,8 @@ extends 'Report';
Exercises
# cd exercises
-# perl bin/prove -lv t/04-method-modifiers.t
+# perl bin/prove -lv \
+ t/04-method-modifiers.t
Iterate til this passes all its tests
@@ -2564,6 +2582,7 @@ Item
(Item)
(Defined)
+ (Value)
Ref
ScalarRef
ArrayRef[`a]
@@ -2662,8 +2681,9 @@ undef
subtype 'PositiveInt',
as 'Int',
where { $_ > 0 },
- message { "The value you provided ($_)"
- . " was not a positive number." };
+ message
+ { "The value you provided ($_)"
+ . " was not a positive int." };
has size => (
is => 'ro',
@@ -2742,7 +2762,9 @@ subtype 'Car',
use Moose::Util::TypeConstraints;
enum Color => qw( red blue green ) );
-my %ok = map { $_ => 1 } qw( red blue green );
+my %ok = map { $_ => 1 }
+ qw( red blue green );
+
subtype 'Color'
as 'Str',
where { $ok{$_} },
@@ -2774,9 +2796,13 @@ has size => (
subtype 'UCStr',
as 'Str',
- where { ! /[a-z]/ };
+ where { ! /[a-z]/ };
+
-coerce 'UCStr',
+
+
Coercions
+
+
coerce 'UCStr',
from 'Str',
via { uc };
@@ -2815,18 +2841,15 @@ coerce 'My::DateTime',
via { [ $_ ] };
- - Coerce instead of a union like
Int | ArrayRef[Int]
+ - Instead of union -
Int | ArrayRef[Int]
Using Types with Attributes
package Person;
-use Moose::Util::TypeConstraints;
-
has height => (
is => 'rw',
isa => 'Num',
@@ -2840,6 +2863,24 @@ has favorite_numbers => (
+
More Droppings
+
+
+ Moose::Util::TypeConstraints also needs cleanup
+
+
package Person;
+
+use Moose;
+use Moose::Util::TypeConstraints;
+
+subtype ...;
+
+no Moose;
+no Moose::Util::TypeConstraints;
+
Typed Methods (Low-tech)
package Person;
@@ -2852,12 +2893,11 @@ sub work {
\@_,
tasks =>
{ isa => 'ArrayRef[Task]',
- coerce =>1 },
+ coerce => 1 },
can_rest =>
{ isa => 'Bool',
default => 0 },
);
-
...
}
@@ -2881,7 +2921,7 @@ sub work {
Digression: The Type Registry
- - Types are actually
Moose::Meta::TypeConstraint objects
+ - Types are actually
Moose::Meta::TypeConstraints objects
- Stored in an interpreter-global registry mapping names to objects
@@ -2910,7 +2950,6 @@ sub work {
Namespace Fix
use Moose::Util::TypeConstraints;
-
subtype 'MyApp::Type::DateTime',
as 'DateTime';
@@ -3090,7 +3129,8 @@ $alice->friend($bob);
use Moose;
has name => ( is => 'ro' );
-has friend => ( is => 'rw', weak_ref => 1 );
+has friend => ( is => 'rw',
+ weak_ref => 1 );
my $alice = Person->new( name => 'Alice' );
my $bob = Person->new( name => 'Bob' );
@@ -3209,7 +3249,6 @@ has lungs => (
package Person;
use Moose;
-
has account => (
is => 'ro',
isa => 'BankAccount',
@@ -3257,7 +3296,6 @@ has name => (
package Auditor;
use Moose::Role;
-
sub record_change { ... }
sub change_history { ... }
@@ -3285,6 +3323,112 @@ has history => (
+
Native Delegation
+
+
+ - Delegate to unblessed Perl types
+ - Scalar, array or hash ref, etc
+ - Treat Perl types as objects
+ - Still uses
handles
+ - Pretend that native Perl types have methods
+
+
+
Native Delegation - Array(Ref)
+
+
+ - Methods include:
+
+ pushshiftelements - returns all elementscountis_empty- quite a few more
+
+
+
+
+
+
+
Native Delegation - Array(Ref)
+
+
package Person;
+use Moose;
+has _favorite_numbers => (
+ traits => [ 'Array' ],
+ is => 'ro',
+ isa => 'ArrayRef[Int]',
+ default => sub { [] },
+ init_arg => undef,
+ handles =>
+ { favorite_numbers => 'elements',
+ add_favorite_number => 'push',
+ },
+);
+
+
+
+
Native Delegation - Array(Ref)
+
+
my $person = Person->new();
+
+$person->add_favorite_number(7);
+$person->add_favorite_number(42);
+
+print "$_\n"
+ for $person->favorite_numbers;
+
+# 7
+# 42
+
+
+
+
Native Delegation
+
+
+ - Native types are ...
+
+ - Number -
add, mul, ...
+ - String -
append, chop, ...
+ - Counter -
inc, dec, ...
+ - Bool -
set, toggle, ...
+ - Hash -
get, set, ...
+ - Array - already saw it
+ - Code -
execute, that's it
+
+
+
+
+
+
+
Curried Delegation
+
+
+ - A delegation with some preset arguments
+ - Works with object or Native delegation
+
+
+
+
+
Curried Delegation
+
+
package Person;
+use Moose;
+has account => (
+ is => 'ro',
+ isa => 'BankAccount',
+ handles => {
+ receive_100 =>
+ [ 'deposit', 100 ]
+ give_100 =>
+ [ 'withdraw', 100 ]
+ },
+);
+
+
+
Traits and Metaclasses
@@ -3327,7 +3471,6 @@ has ssn => (
isa => 'Str',
label => 'Social Security Number',
);
-
print Person->meta
->get_attribute('ssn')->label;
@@ -3346,7 +3489,6 @@ has ssn => (
isa => 'Str',
label => 'Social Security Number',
);
-
print
Person->meta
->get_attribute('ssn')->label;
@@ -3381,7 +3523,8 @@ print
Person->meta
Exercises
# cd exercises
-# perl bin/prove -lv t/06-advanced-attributes.t
+# perl bin/prove -lv \
+ t/06-advanced-attributes.t
Iterate til this passes all its tests
+ 