X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMouse%2FMeta%2FAttribute.pm;h=77d935a03711d566f57d795db5a413d1b4c6ddab;hb=60b5c3be4d0b3bb705df1e8d977f2ce90db6668d;hp=af9e737602b1377a6048b6c5003d361bf42da1e3;hpb=f7b11a21869769d2b49bba4fa72d33fa54ad0c2e;p=gitmo%2FMouse.git

diff --git a/lib/Mouse/Meta/Attribute.pm b/lib/Mouse/Meta/Attribute.pm
index af9e737..77d935a 100644
--- a/lib/Mouse/Meta/Attribute.pm
+++ b/lib/Mouse/Meta/Attribute.pm
@@ -1,277 +1,201 @@
-#!/usr/bin/env perl
 package Mouse::Meta::Attribute;
 use strict;
 use warnings;
 
-use Carp 'confess';
-use Scalar::Util 'blessed';
+use Mouse::Meta::TypeConstraint;
+use Mouse::Meta::Method::Accessor;
 
 sub new {
-    my $class = shift;
-    my %args  = @_;
+    my ($class, $name, %options) = @_;
 
-    my $name = $args{name};
+    $options{name} = $name;
 
-    $args{init_arg} = $name
-        unless exists $args{init_arg};
+    $options{init_arg} = $name
+        unless exists $options{init_arg};
 
-    $args{is} ||= '';
+    my $is = $options{is} ||= '';
 
-    if ($args{lazy_build}) {
-        confess("You can not use lazy_build and default for the same attribute $name")
-            if exists $args{default};
-        $args{lazy}      = 1;
-        $args{required}  = 1;
-        $args{builder}   = "_build_${name}"
-            if !exists($args{builder});
-        if ($name =~ /^_/) {
-            $args{clearer}   = "_clear${name}" if !exists($args{clearer});
-            $args{predicate} = "_has${name}" if !exists($args{predicate});
-        }
-        else {
-            $args{clearer}   = "clear_${name}" if !exists($args{clearer});
-            $args{predicate} = "has_${name}" if !exists($args{predicate});
-        }
+    if($is eq 'rw'){
+        $options{accessor} = $name if !exists $options{accessor};
+    }
+    elsif($is eq 'ro'){
+        $options{reader}   = $name if !exists $options{reader};
     }
 
-    bless \%args, $class;
+    bless \%options, $class;
 }
 
-sub name              { $_[0]->{name}            }
-sub class             { $_[0]->{class}           }
-sub _is_metadata      { $_[0]->{is}              }
-sub is_required       { $_[0]->{required}        }
-sub default           { $_[0]->{default}         }
-sub is_lazy           { $_[0]->{lazy}            }
-sub is_lazy_build     { $_[0]->{lazy_build}      }
-sub predicate         { $_[0]->{predicate}       }
-sub clearer           { $_[0]->{clearer}         }
-sub handles           { $_[0]->{handles}         }
-sub is_weak_ref       { $_[0]->{weak_ref}        }
-sub init_arg          { $_[0]->{init_arg}        }
-sub type_constraint   { $_[0]->{type_constraint} }
-sub trigger           { $_[0]->{trigger}         }
-sub builder           { $_[0]->{builder}         }
-sub should_auto_deref { $_[0]->{auto_deref}      }
-
-sub has_default         { exists $_[0]->{default}         }
-sub has_predicate       { exists $_[0]->{predicate}       }
-sub has_clearer         { exists $_[0]->{clearer}         }
-sub has_handles         { exists $_[0]->{handles}         }
-sub has_type_constraint { exists $_[0]->{type_constraint} }
-sub has_trigger         { exists $_[0]->{trigger}         }
-sub has_builder         { exists $_[0]->{builder}         }
+# readers
+
+sub name                 { $_[0]->{name}                   }
+sub associated_class     { $_[0]->{associated_class}       }
+
+sub accessor             { $_[0]->{accessor}               }
+sub reader               { $_[0]->{reader}                 }
+sub writer               { $_[0]->{writer}                 }
+sub predicate            { $_[0]->{predicate}              }
+sub clearer              { $_[0]->{clearer}                }
+sub handles              { $_[0]->{handles}                }
+
+sub _is_metadata         { $_[0]->{is}                     }
+sub is_required          { $_[0]->{required}               }
+sub default              { $_[0]->{default}                }
+sub is_lazy              { $_[0]->{lazy}                   }
+sub is_lazy_build        { $_[0]->{lazy_build}             }
+sub is_weak_ref          { $_[0]->{weak_ref}               }
+sub init_arg             { $_[0]->{init_arg}               }
+sub type_constraint      { $_[0]->{type_constraint}        }
+sub find_type_constraint {
+    Carp::carp("This method was deprecated");
+    $_[0]->type_constraint();
+}
+sub trigger              { $_[0]->{trigger}                }
+sub builder              { $_[0]->{builder}                }
+sub should_auto_deref    { $_[0]->{auto_deref}             }
+sub should_coerce        { $_[0]->{should_coerce}          }
+
+# predicates
+
+sub has_accessor         { exists $_[0]->{accessor}        }
+sub has_reader           { exists $_[0]->{reader}          }
+sub has_writer           { exists $_[0]->{writer}          }
+sub has_predicate        { exists $_[0]->{predicate}       }
+sub has_clearer          { exists $_[0]->{clearer}         }
+sub has_handles          { exists $_[0]->{handles}         }
+
+sub has_default          { exists $_[0]->{default}         }
+sub has_type_constraint  { exists $_[0]->{type_constraint} }
+sub has_trigger          { exists $_[0]->{trigger}         }
+sub has_builder          { exists $_[0]->{builder}         }
 
 sub _create_args {
     $_[0]->{_create_args} = $_[1] if @_ > 1;
     $_[0]->{_create_args}
 }
 
-sub generate_accessor {
-    my $attribute = shift;
-
-    my $name       = $attribute->name;
-    my $key        = $name;
-    my $default    = $attribute->default;
-    my $trigger    = $attribute->trigger;
-    my $type       = $attribute->type_constraint;
-    my $constraint = $attribute->find_type_constraint;
-    my $builder    = $attribute->builder;
-
-    my $accessor = 'sub {
-        my $self = shift;';
-
-    if ($attribute->_is_metadata eq 'rw') {
-        $accessor .= 'if (@_) {
-            local $_ = $_[0];';
-
-        if ($constraint) {
-            $accessor .= 'do {
-                my $display = defined($_) ? overload::StrVal($_) : "undef";
-                Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $display") unless $constraint->();
-            };'
-        }
-
-        $accessor .= '$self->{$key} = $_;';
-
-        if ($attribute->is_weak_ref) {
-            $accessor .= 'Scalar::Util::weaken($self->{$key}) if ref($self->{$key});';
-        }
-
-        if ($trigger) {
-            $accessor .= '$trigger->($self, $_, $attribute);';
-        }
+sub accessor_metaclass { 'Mouse::Meta::Method::Accessor' }
 
-        $accessor .= '}';
-    }
-    else {
-        $accessor .= 'confess "Cannot assign a value to a read-only accessor" if @_;';
-    }
+sub create {
+    my ($self, $class, $name, %args) = @_;
 
-    if ($attribute->is_lazy) {
-        $accessor .= '$self->{$key} = ';
+    $args{name}             = $name;
+    $args{associated_class} = $class;
 
-        $accessor .= $attribute->has_builder
-                   ? '$self->$builder'
-                     : ref($default) eq 'CODE'
-                     ? '$default->($self)'
-                     : '$default';
+    %args = $self->canonicalize_args($name, %args);
+    $self->validate_args($name, \%args);
 
-        $accessor .= ' if !exists($self->{$key});';
-    }
+    $args{should_coerce} = delete $args{coerce}
+        if exists $args{coerce};
 
-    if ($attribute->should_auto_deref) {
-        if ($attribute->type_constraint eq 'ArrayRef') {
-            $accessor .= 'if (wantarray) {
-                return @{ $self->{$key} || [] };
-            }';
-        }
-        else {
-            $accessor .= 'if (wantarray) {
-                return %{ $self->{$key} || {} };
-            }';
-        }
+    if (exists $args{isa}) {
+        my $type_constraint = delete $args{isa};
+        $args{type_constraint}= Mouse::Util::TypeConstraints::find_or_create_isa_type_constraint($type_constraint);
     }
 
-    $accessor .= 'return $self->{$key};
-    }';
-
-    return eval $accessor;
-}
-
-sub generate_predicate {
-    my $attribute = shift;
-    my $key = $attribute->name;
-
-    my $predicate = 'sub { exists($_[0]->{$key}) }';
+    my $attribute = $self->new($name, %args);
 
-    return eval $predicate;
-}
-
-sub generate_clearer {
-    my $attribute = shift;
-    my $key = $attribute->name;
-
-    my $predicate = 'sub { delete($_[0]->{$key}) }';
-
-    return eval $predicate;
-}
+    $attribute->_create_args(\%args);
 
-sub generate_handles {
-    my $attribute = shift;
-    my $reader = $attribute->name;
-    my %handles = $attribute->_canonicalize_handles($attribute->handles);
+    $class->add_attribute($attribute);
 
-    my %method_map;
+    my $associated_methods = 0;
 
-    for my $local_method (keys %handles) {
-        my $remote_method = $handles{$local_method};
+    my $generator_class = $self->accessor_metaclass;
+    foreach my $type(qw(accessor reader writer predicate clearer handles)){
+        if(exists $attribute->{$type}){
+            my $installer    = '_install_' . $type;
+            $generator_class->$installer($attribute, $attribute->{$type}, $class);
+            $associated_methods++;
+        }
+    }
 
-        my $method = 'sub {
-            my $self = shift;
-            $self->$reader->$remote_method(@_)
-        }';
+    if($associated_methods == 0 && ($attribute->_is_metadata || '') ne 'bare'){
+        Carp::cluck(qq{Attribute ($name) of class }.$class->name.qq{ has no associated methods (did you mean to provide an "is" argument?)});
 
-        $method_map{$local_method} = eval $method;
     }
 
-    return \%method_map;
+    return $attribute;
 }
 
-sub create {
-    my ($self, $class, $name, %args) = @_;
-
-    $args{name} = $name;
-    $args{class} = $class;
-
-    $self->validate_args($name, %args);
-
-    $args{type_constraint} = delete $args{isa}
-        if exists $args{isa};
-
-    my $attribute = $self->new(%args);
-    $attribute->_create_args(\%args);
-
-    my $meta = $class->meta;
-
-    $meta->add_attribute($attribute);
-
-    # install an accessor
-    if ($attribute->_is_metadata eq 'rw' || $attribute->_is_metadata eq 'ro') {
-        my $accessor = $attribute->generate_accessor;
-        no strict 'refs';
-        *{ $class . '::' . $name } = $accessor;
-    }
+sub canonicalize_args {
+    my $self = shift;
+    my $name = shift;
+    my %args = @_;
 
-    for my $method (qw/predicate clearer/) {
-        my $predicate = "has_$method";
-        if ($attribute->$predicate) {
-            my $generator = "generate_$method";
-            my $coderef = $attribute->$generator;
-            no strict 'refs';
-            *{ $class . '::' . $attribute->$method } = $coderef;
+    if ($args{lazy_build}) {
+        $args{lazy}      = 1;
+        $args{required}  = 1;
+        $args{builder}   = "_build_${name}"
+            if !exists($args{builder});
+        if ($name =~ /^_/) {
+            $args{clearer}   = "_clear${name}" if !exists($args{clearer});
+            $args{predicate} = "_has${name}" if !exists($args{predicate});
         }
-    }
-
-    if ($attribute->has_handles) {
-        my $method_map = $attribute->generate_handles;
-        for my $method_name (keys %$method_map) {
-            no strict 'refs';
-            *{ $class . '::' . $method_name } = $method_map->{$method_name};
+        else {
+            $args{clearer}   = "clear_${name}" if !exists($args{clearer});
+            $args{predicate} = "has_${name}" if !exists($args{predicate});
         }
     }
 
-    return $attribute;
+    return %args;
 }
 
 sub validate_args {
     my $self = shift;
     my $name = shift;
-    my %args = @_;
+    my $args = shift;
 
-    confess "You cannot have lazy attribute ($name) without specifying a default value for it"
-        if $args{lazy} && !exists($args{default}) && !exists($args{builder});
+    $self->throw_error("You can not use lazy_build and default for the same attribute ($name)")
+        if $args->{lazy_build} && exists $args->{default};
 
-    confess "References are not allowed as default values, you must wrap the default of '$name' in a CODE reference (ex: sub { [] } and not [])"
-        if ref($args{default})
-        && ref($args{default}) ne 'CODE';
+    $self->throw_error("You cannot have lazy attribute ($name) without specifying a default value for it")
+        if $args->{lazy}
+        && !exists($args->{default})
+        && !exists($args->{builder});
 
-    confess "You cannot auto-dereference without specifying a type constraint on attribute $name"
-        if $args{auto_deref} && !exists($args{isa});
+    $self->throw_error("References are not allowed as default values, you must wrap the default of '$name' in a CODE reference (ex: sub { [] } and not [])")
+        if ref($args->{default})
+        && ref($args->{default}) ne 'CODE';
 
-    confess "You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute $name"
-        if $args{auto_deref}
-        && $args{isa} ne 'ArrayRef'
-        && $args{isa} ne 'HashRef';
+    $self->throw_error("You cannot auto-dereference without specifying a type constraint on attribute ($name)")
+        if $args->{auto_deref} && !exists($args->{isa});
 
-    return 1;
-}
-
-sub find_type_constraint {
-    my $self = shift;
-    my $type = $self->type_constraint;
+    $self->throw_error("You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)")
+        if $args->{auto_deref}
+        && $args->{isa} !~ /^(?:ArrayRef|HashRef)(?:\[.*\])?$/;
 
-    return unless $type;
+    if ($args->{trigger}) {
+        if (ref($args->{trigger}) eq 'HASH') {
+            $self->throw_error("HASH-based form of trigger has been removed. Only the coderef form of triggers are now supported.");
+        }
 
-    my $checker = Mouse::TypeRegistry->optimized_constraints->{$type};
-    return $checker if $checker;
+        $self->throw_error("Trigger must be a CODE ref on attribute ($name)")
+            if ref($args->{trigger}) ne 'CODE';
+    }
 
-    return sub { blessed($_) && blessed($_) eq $type };
+    return 1;
 }
 
-sub verify_type_constraint {
-    my $self = shift;
-    local $_ = shift;
+sub verify_against_type_constraint {
+    my ($self, $value) = @_;
+    my $tc = $self->type_constraint;
+    return 1 unless $tc;
+
+    local $_ = $value;
+    return 1 if $tc->check($value);
 
-    my $type = $self->type_constraint
-        or return 1;
-    my $constraint = $self->find_type_constraint;
+    $self->verify_type_constraint_error($self->name, $value, $tc);
+}
 
-    return 1 if $constraint->($_);
+sub verify_type_constraint_error {
+    my($self, $name, $value, $type) = @_;
+    $self->throw_error("Attribute ($name) does not pass the type constraint because: " . $type->get_message($value));
+}
 
-    my $name = $self->name;
-    my $display = defined($_) ? overload::StrVal($_) : 'undef';
-    Carp::confess("Attribute ($name) does not pass the type constraint because: Validation failed for \'$type\' failed with value $display");
+sub coerce_constraint { ## my($self, $value) = @_;
+    my $type = $_[0]->{type_constraint}
+        or return $_[1];
+    return Mouse::Util::TypeConstraints->typecast_constraints($_[0]->associated_class->name, $_[0]->type_constraint, $_[1]);
 }
 
 sub _canonicalize_handles {
@@ -285,7 +209,7 @@ sub _canonicalize_handles {
         return map { $_ => $_ } @$handles;
     }
     else {
-        confess "Unable to canonicalize the 'handles' option with $handles";
+        $self->throw_error("Unable to canonicalize the 'handles' option with $handles");
     }
 }
 
@@ -303,13 +227,20 @@ sub get_parent_args {
     my $class = shift;
     my $name  = shift;
 
-    for my $super ($class->meta->linearized_isa) {
+    for my $super ($class->linearized_isa) {
         my $super_attr = $super->can("meta") && $super->meta->get_attribute($name)
             or next;
         return %{ $super_attr->_create_args };
     }
 
-    confess "Could not find an attribute by the name of '$name' to inherit from";
+    $self->throw_error("Could not find an attribute by the name of '$name' to inherit from");
+}
+
+sub throw_error{
+    my $self = shift;
+
+    my $metaclass = (ref $self && $self->associated_class) || 'Mouse::Meta::Class';
+    $metaclass->throw_error(@_, depth => 1);
 }
 
 1;
@@ -333,7 +264,7 @@ installed. Some error checking is done.
 
 =head2 name -> AttributeName
 
-=head2 class -> OwnerClass
+=head2 associated_class -> OwnerClass
 
 =head2 is_required -> Bool
 
@@ -377,31 +308,20 @@ installed. Some error checking is done.
 
 Informational methods.
 
-=head2 generate_accessor -> CODE
-
-Creates a new code reference for the attribute's accessor.
-
-=head2 generate_predicate -> CODE
-
-Creates a new code reference for the attribute's predicate.
-
-=head2 generate_clearer -> CODE
+=head2 verify_against_type_constraint Item -> 1 | ERROR
 
-Creates a new code reference for the attribute's clearer.
-
-=head2 generate_handles -> { MethodName => CODE }
-
-Creates a new code reference for each of the attribute's handles methods.
+Checks that the given value passes this attribute's type constraint. Returns 1
+on success, otherwise C<confess>es.
 
-=head2 find_type_constraint -> CODE
+=head2 canonicalize_args Name, %args -> %args
 
-Returns a code reference which can be used to check that a given value passes
-this attribute's type constraint;
+Canonicalizes some arguments to create. In particular, C<lazy_build> is
+canonicalized into C<lazy>, C<builder>, etc.
 
-=head2 verify_type_constraint Item -> 1 | ERROR
+=head2 validate_args Name, \%args -> 1 | ERROR
 
-Checks that the given value passes this attribute's type constraint. Returns 1
-on success, otherwise C<confess>es.
+Checks that the arguments to create the attribute (ie those specified by
+C<has>) are valid.
 
 =head2 clone_parent OwnerClass, AttributeName, %args -> Mouse::Meta::Attribute