package NEXT;
-$VERSION = '0.60';
+$VERSION = '0.64';
use Carp;
use strict;
+use overload ();
sub NEXT::ELSEWHERE::ancestors
{
: 0 } @outlist;
}
-sub AUTOLOAD
+sub NEXT::ELSEWHERE::buildAUTOLOAD
{
- my ($self) = @_;
- my $caller = (caller(1))[3];
- my $wanted = $NEXT::AUTOLOAD || 'NEXT::AUTOLOAD';
- undef $NEXT::AUTOLOAD;
- my ($caller_class, $caller_method) = $caller =~ m{(.*)::(.*)}g;
- my ($wanted_class, $wanted_method) = $wanted =~ m{(.*)::(.*)}g;
- croak "Can't call $wanted from $caller"
- unless $caller_method eq $wanted_method;
-
- local ($NEXT::NEXT{$self,$wanted_method}, $NEXT::SEEN) =
- ($NEXT::NEXT{$self,$wanted_method}, $NEXT::SEEN);
-
-
- unless ($NEXT::NEXT{$self,$wanted_method}) {
- my @forebears =
- NEXT::ELSEWHERE::ancestors ref $self || $self,
- $wanted_class;
- while (@forebears) {
- last if shift @forebears eq $caller_class
- }
- no strict 'refs';
- @{$NEXT::NEXT{$self,$wanted_method}} =
- map { *{"${_}::$caller_method"}{CODE}||() } @forebears
- unless $wanted_method eq 'AUTOLOAD';
- @{$NEXT::NEXT{$self,$wanted_method}} =
- map { (*{"${_}::AUTOLOAD"}{CODE}) ? "${_}::AUTOLOAD" : ()} @forebears
- unless @{$NEXT::NEXT{$self,$wanted_method}||[]};
- $NEXT::SEEN->{$self,*{$caller}{CODE}}++;
- }
- my $call_method = shift @{$NEXT::NEXT{$self,$wanted_method}};
- while ($wanted_class =~ /^NEXT\b.*\b(UNSEEN|DISTINCT)\b/
- && defined $call_method
- && $NEXT::SEEN->{$self,$call_method}++) {
- $call_method = shift @{$NEXT::NEXT{$self,$wanted_method}};
- }
- unless (defined $call_method) {
- return unless $wanted_class =~ /^NEXT:.*:ACTUAL/;
- (local $Carp::CarpLevel)++;
- croak qq(Can't locate object method "$wanted_method" ),
- qq(via package "$caller_class");
- };
- return $self->$call_method(@_[1..$#_]) if ref $call_method eq 'CODE';
- no strict 'refs';
- ($wanted_method=${$caller_class."::AUTOLOAD"}) =~ s/.*:://
- if $wanted_method eq 'AUTOLOAD';
- $$call_method = $caller_class."::NEXT::".$wanted_method;
- return $call_method->(@_);
+ my $autoload_name = caller() . '::AUTOLOAD';
+
+ no strict 'refs';
+ *{$autoload_name} = sub {
+ my ($self) = @_;
+ my $depth = 1;
+ until (((caller($depth))[3]||q{}) !~ /^\(eval\)$/) { $depth++ }
+ my $caller = (caller($depth))[3];
+ my $wanted = $NEXT::AUTOLOAD || $autoload_name;
+ undef $NEXT::AUTOLOAD;
+ my ($caller_class, $caller_method) = do { $caller =~ m{(.*)::(.*)}g };
+ my ($wanted_class, $wanted_method) = do { $wanted =~ m{(.*)::(.*)}g };
+ croak "Can't call $wanted from $caller"
+ unless $caller_method eq $wanted_method;
+
+ my $key = ref $self && overload::Overloaded($self)
+ ? overload::StrVal($self) : $self;
+
+ local ($NEXT::NEXT{$key,$wanted_method}, $NEXT::SEEN) =
+ ($NEXT::NEXT{$key,$wanted_method}, $NEXT::SEEN);
+
+ unless ($NEXT::NEXT{$key,$wanted_method}) {
+ my @forebears =
+ NEXT::ELSEWHERE::ancestors ref $self || $self,
+ $wanted_class;
+ while (@forebears) {
+ last if shift @forebears eq $caller_class
+ }
+ no strict 'refs';
+ @{$NEXT::NEXT{$key,$wanted_method}} =
+ map {
+ my $stash = \%{"${_}::"};
+ ($stash->{$caller_method} && (*{$stash->{$caller_method}}{CODE}))
+ ? *{$stash->{$caller_method}}{CODE}
+ : () } @forebears
+ unless $wanted_method eq 'AUTOLOAD';
+ @{$NEXT::NEXT{$key,$wanted_method}} =
+ map {
+ my $stash = \%{"${_}::"};
+ ($stash->{AUTOLOAD} && (*{$stash->{AUTOLOAD}}{CODE}))
+ ? "${_}::AUTOLOAD"
+ : () } @forebears
+ unless @{$NEXT::NEXT{$key,$wanted_method}||[]};
+ $NEXT::SEEN->{$key,*{$caller}{CODE}}++;
+ }
+ my $call_method = shift @{$NEXT::NEXT{$key,$wanted_method}};
+ while (do { $wanted_class =~ /^NEXT\b.*\b(UNSEEN|DISTINCT)\b/ }
+ && defined $call_method
+ && $NEXT::SEEN->{$key,$call_method}++) {
+ $call_method = shift @{$NEXT::NEXT{$key,$wanted_method}};
+ }
+ unless (defined $call_method) {
+ return unless do { $wanted_class =~ /^NEXT:.*:ACTUAL/ };
+ (local $Carp::CarpLevel)++;
+ croak qq(Can't locate object method "$wanted_method" ),
+ qq(via package "$caller_class");
+ };
+ return $self->$call_method(@_[1..$#_]) if ref $call_method eq 'CODE';
+ no strict 'refs';
+ do { ($wanted_method=${$caller_class."::AUTOLOAD"}) =~ s/.*::// }
+ if $wanted_method eq 'AUTOLOAD';
+ $$call_method = $caller_class."::NEXT::".$wanted_method;
+ return $call_method->(@_);
+ };
}
no strict 'vars';
-package NEXT::UNSEEN; @ISA = 'NEXT';
-package NEXT::DISTINCT; @ISA = 'NEXT';
-package NEXT::ACTUAL; @ISA = 'NEXT';
-package NEXT::ACTUAL::UNSEEN; @ISA = 'NEXT';
-package NEXT::ACTUAL::DISTINCT; @ISA = 'NEXT';
-package NEXT::UNSEEN::ACTUAL; @ISA = 'NEXT';
-package NEXT::DISTINCT::ACTUAL; @ISA = 'NEXT';
-
-package EVERY::LAST; @ISA = 'EVERY';
-package EVERY; @ISA = 'NEXT';
-sub AUTOLOAD
-{
- my ($self) = @_;
- my $caller = (caller(1))[3];
- my $wanted = $EVERY::AUTOLOAD || 'EVERY::AUTOLOAD';
- undef $EVERY::AUTOLOAD;
- my ($wanted_class, $wanted_method) = $wanted =~ m{(.*)::(.*)}g;
-
- local $NEXT::ALREADY_IN_EVERY{$self,$wanted_method} =
- $NEXT::ALREADY_IN_EVERY{$self,$wanted_method};
-
- return if $NEXT::ALREADY_IN_EVERY{$self,$wanted_method}++;
-
- my @forebears = NEXT::ELSEWHERE::ordered_ancestors ref $self || $self,
- $wanted_class;
- @forebears = reverse @forebears if $wanted_class =~ /\bLAST\b/;
- no strict 'refs';
- my %seen;
- my @every = map { my $sub = "${_}::$wanted_method";
- !*{$sub}{CODE} || $seen{$sub}++ ? () : $sub
- } @forebears
- unless $wanted_method eq 'AUTOLOAD';
-
- my $want = wantarray;
- if (@every) {
- if ($want) {
- return map {($_, [$self->$_(@_[1..$#_])])} @every;
- }
- elsif (defined $want) {
- return { map {($_, scalar($self->$_(@_[1..$#_])))}
- @every
- };
- }
- else {
- $self->$_(@_[1..$#_]) for @every;
- return;
- }
- }
-
- @every = map { my $sub = "${_}::AUTOLOAD";
- !*{$sub}{CODE} || $seen{$sub}++ ? () : "${_}::AUTOLOAD"
- } @forebears;
- if ($want) {
- return map { $$_ = ref($self)."::EVERY::".$wanted_method;
- ($_, [$self->$_(@_[1..$#_])]);
- } @every;
- }
- elsif (defined $want) {
- return { map { $$_ = ref($self)."::EVERY::".$wanted_method;
- ($_, scalar($self->$_(@_[1..$#_])))
- } @every
- };
- }
- else {
- for (@every) {
- $$_ = ref($self)."::EVERY::".$wanted_method;
- $self->$_(@_[1..$#_]);
- }
- return;
- }
+package NEXT; NEXT::ELSEWHERE::buildAUTOLOAD();
+package NEXT::UNSEEN; @ISA = 'NEXT'; NEXT::ELSEWHERE::buildAUTOLOAD();
+package NEXT::DISTINCT; @ISA = 'NEXT'; NEXT::ELSEWHERE::buildAUTOLOAD();
+package NEXT::ACTUAL; @ISA = 'NEXT'; NEXT::ELSEWHERE::buildAUTOLOAD();
+package NEXT::ACTUAL::UNSEEN; @ISA = 'NEXT'; NEXT::ELSEWHERE::buildAUTOLOAD();
+package NEXT::ACTUAL::DISTINCT; @ISA = 'NEXT'; NEXT::ELSEWHERE::buildAUTOLOAD();
+package NEXT::UNSEEN::ACTUAL; @ISA = 'NEXT'; NEXT::ELSEWHERE::buildAUTOLOAD();
+package NEXT::DISTINCT::ACTUAL; @ISA = 'NEXT'; NEXT::ELSEWHERE::buildAUTOLOAD();
+
+package EVERY;
+
+sub EVERY::ELSEWHERE::buildAUTOLOAD {
+ my $autoload_name = caller() . '::AUTOLOAD';
+
+ no strict 'refs';
+ *{$autoload_name} = sub {
+ my ($self) = @_;
+ my $depth = 1;
+ until (((caller($depth))[3]||q{}) !~ /^\(eval\)$/) { $depth++ }
+ my $caller = (caller($depth))[3];
+ my $wanted = $EVERY::AUTOLOAD || $autoload_name;
+ undef $EVERY::AUTOLOAD;
+ my ($wanted_class, $wanted_method) = do { $wanted =~ m{(.*)::(.*)}g };
+
+ my $key = ref($self) && overload::Overloaded($self)
+ ? overload::StrVal($self) : $self;
+
+ local $NEXT::ALREADY_IN_EVERY{$key,$wanted_method} =
+ $NEXT::ALREADY_IN_EVERY{$key,$wanted_method};
+
+ return if $NEXT::ALREADY_IN_EVERY{$key,$wanted_method}++;
+
+ my @forebears = NEXT::ELSEWHERE::ordered_ancestors ref $self || $self,
+ $wanted_class;
+ @forebears = reverse @forebears if do { $wanted_class =~ /\bLAST\b/ };
+ no strict 'refs';
+ my %seen;
+ my @every = map { my $sub = "${_}::$wanted_method";
+ !*{$sub}{CODE} || $seen{$sub}++ ? () : $sub
+ } @forebears
+ unless $wanted_method eq 'AUTOLOAD';
+
+ my $want = wantarray;
+ if (@every) {
+ if ($want) {
+ return map {($_, [$self->$_(@_[1..$#_])])} @every;
+ }
+ elsif (defined $want) {
+ return { map {($_, scalar($self->$_(@_[1..$#_])))}
+ @every
+ };
+ }
+ else {
+ $self->$_(@_[1..$#_]) for @every;
+ return;
+ }
+ }
+
+ @every = map { my $sub = "${_}::AUTOLOAD";
+ !*{$sub}{CODE} || $seen{$sub}++ ? () : "${_}::AUTOLOAD"
+ } @forebears;
+ if ($want) {
+ return map { $$_ = ref($self)."::EVERY::".$wanted_method;
+ ($_, [$self->$_(@_[1..$#_])]);
+ } @every;
+ }
+ elsif (defined $want) {
+ return { map { $$_ = ref($self)."::EVERY::".$wanted_method;
+ ($_, scalar($self->$_(@_[1..$#_])))
+ } @every
+ };
+ }
+ else {
+ for (@every) {
+ $$_ = ref($self)."::EVERY::".$wanted_method;
+ $self->$_(@_[1..$#_]);
+ }
+ return;
+ }
+ };
}
+package EVERY::LAST; @ISA = 'EVERY'; EVERY::ELSEWHERE::buildAUTOLOAD();
+package EVERY; @ISA = 'NEXT'; EVERY::ELSEWHERE::buildAUTOLOAD();
1;
=head1 DESCRIPTION
NEXT.pm adds a pseudoclass named C<NEXT> to any program
-that uses it. If a method C<m> calls C<$self->NEXT::m()>, the call to
+that uses it. If a method C<m> calls C<$self-E<gt>NEXT::m()>, the call to
C<m> is redispatched as if the calling method had not originally been found.
-In other words, a call to C<$self->NEXT::m()> resumes the depth-first,
+In other words, a call to C<$self-E<gt>NEXT::m()> resumes the depth-first,
left-to-right search of C<$self>'s class hierarchy that resulted in the
original call to C<m>.
-Note that this is not the same thing as C<$self->SUPER::m()>, which
+Note that this is not the same thing as C<$self-E<gt>SUPER::m()>, which
begins a new dispatch that is restricted to searching the ancestors
-of the current class. C<$self->NEXT::m()> can backtrack
+of the current class. C<$self-E<gt>NEXT::m()> can backtrack
past the current class -- to look for a suitable method in other
-ancestors of C<$self> -- whereas C<$self->SUPER::m()> cannot.
+ancestors of C<$self> -- whereas C<$self-E<gt>SUPER::m()> cannot.
A typical use would be in the destructors of a class hierarchy,
as illustrated in the synopsis above. Each class in the hierarchy
By default, if a redispatch attempt fails to find another method
elsewhere in the objects class hierarchy, it quietly gives up and does
-nothing (but see L<"Enforcing redispatch">). This gracious acquiesence
+nothing (but see L<"Enforcing redispatch">). This gracious acquiescence
is also unlike the (generally annoying) behaviour of C<SUPER>, which
throws an exception if it cannot redispatch.
That means that the inheritance tree of the object is traversed breadth-first
and the resulting order of classes is used as the sequence in which methods
are called. However, that sequence is modified by imposing a rule that the
-appropritae method of a derived class must be called before the same method of
+appropriate method of a derived class must be called before the same method of
any ancestral class. That's why, in the above example, C<X::foo> is called
before C<D::foo>, even though C<D> comes before C<X> in C<@B::ISA>.
https://perl5.git.perl.org / perl5.git / blobdiff