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# -*- Mode: cperl; coding: utf-8; cperl-indent-level: 4 -*- # vim: ts=4 sts=4 sw=4: use 5.006; use strict; package CPAN::Distroprefs; use vars qw($VERSION); $VERSION = '6.0001'; package CPAN::Distroprefs::Result; use File::Spec; sub new { bless $_[1] || {} => $_[0] } sub abs { File::Spec->catfile($_[0]->dir, $_[0]->file) } sub __cloner { my ($class, $name, $newclass) = @_; $newclass = 'CPAN::Distroprefs::Result::' . $newclass; no strict 'refs'; *{$class . '::' . $name} = sub { $newclass->new({ %{ $_[0] }, %{ $_[1] }, }); }; } BEGIN { __PACKAGE__->__cloner(as_warning => 'Warning') } BEGIN { __PACKAGE__->__cloner(as_fatal => 'Fatal') } BEGIN { __PACKAGE__->__cloner(as_success => 'Success') } sub __accessor { my ($class, $key) = @_; no strict 'refs'; *{$class . '::' . $key} = sub { $_[0]->{$key} }; } BEGIN { __PACKAGE__->__accessor($_) for qw(type file ext dir) } sub is_warning { 0 } sub is_fatal { 0 } sub is_success { 0 } package CPAN::Distroprefs::Result::Error; use vars qw(@ISA); BEGIN { @ISA = 'CPAN::Distroprefs::Result' } ## no critic BEGIN { __PACKAGE__->__accessor($_) for qw(msg) } sub as_string { my ($self) = @_; if ($self->msg) { return sprintf $self->fmt_reason, $self->file, $self->msg; } else { return sprintf $self->fmt_unknown, $self->file; } } package CPAN::Distroprefs::Result::Warning; use vars qw(@ISA); BEGIN { @ISA = 'CPAN::Distroprefs::Result::Error' } ## no critic sub is_warning { 1 } sub fmt_reason { "Error reading distroprefs file %s, skipping: %s" } sub fmt_unknown { "Unknown error reading distroprefs file %s, skipping." } package CPAN::Distroprefs::Result::Fatal; use vars qw(@ISA); BEGIN { @ISA = 'CPAN::Distroprefs::Result::Error' } ## no critic sub is_fatal { 1 } sub fmt_reason { "Error reading distroprefs file %s: %s" } sub fmt_unknown { "Unknown error reading distroprefs file %s." } package CPAN::Distroprefs::Result::Success; use vars qw(@ISA); BEGIN { @ISA = 'CPAN::Distroprefs::Result' } ## no critic BEGIN { __PACKAGE__->__accessor($_) for qw(prefs extension) } sub is_success { 1 } package CPAN::Distroprefs::Iterator; sub new { bless $_[1] => $_[0] } sub next { $_[0]->() } package CPAN::Distroprefs; use Carp (); use DirHandle; sub _load_method { my ($self, $loader, $result) = @_; return '_load_yaml' if $loader eq 'CPAN' or $loader =~ /^YAML(::|$)/; return '_load_' . $result->ext; } sub _load_yaml { my ($self, $loader, $result) = @_; my $data = eval { $loader eq 'CPAN' ? $loader->_yaml_loadfile($result->abs) : [ $loader->can('LoadFile')->($result->abs) ] }; if (my $err = $@) { die $result->as_warning({ msg => $err, }); } elsif (!$data) { die $result->as_warning; } else { return @$data; } } sub _load_dd { my ($self, $loader, $result) = @_; my @data; { package CPAN::Eval; # this caused a die in CPAN.pm, and I am leaving it 'fatal', though I'm # not sure why we wouldn't just skip the file as we do for all other # errors. -- hdp my $abs = $result->abs; open FH, "<$abs" or die $result->as_fatal(msg => "$!"); local $/; my $eval = <FH>; close FH; no strict; eval $eval; if (my $err = $@) { die $result->as_warning({ msg => $err }); } my $i = 1; while (${"VAR$i"}) { push @data, ${"VAR$i"}; $i++; } } return @data; } sub _load_st { my ($self, $loader, $result) = @_; # eval because Storable is never forward compatible my @data = eval { @{scalar $loader->can('retrieve')->($result->abs) } }; if (my $err = $@) { die $result->as_warning({ msg => $err }); } return @data; } sub _build_file_list { if (@_ > 3) { die "_build_file_list should be called with 3 arguments, was called with more. First argument is '$_[0]'."; } my ($dir, $dir1, $ext_re) = @_; my @list; my $dh; unless (opendir($dh, $dir)) { $CPAN::Frontend->mywarn("ignoring prefs directory '$dir': $!"); return @list; } while (my $fn = readdir $dh) { next if $fn eq '.' || $fn eq '..'; if (-d "$dir/$fn") { next if $fn =~ /^[._]/; # prune .svn, .git, .hg, _darcs and what the user wants to hide push @list, _build_file_list("$dir/$fn", "$dir1$fn/", $ext_re); } else { if ($fn =~ $ext_re) { push @list, "$dir1$fn"; } } } return @list; } sub find { my ($self, $dir, $ext_map) = @_; return CPAN::Distroprefs::Iterator->new(sub { return }) unless %$ext_map; my $possible_ext = join "|", map { quotemeta } keys %$ext_map; my $ext_re = qr/\.($possible_ext)$/; my @files = _build_file_list($dir, '', $ext_re); @files = sort @files if @files; # label the block so that we can use redo in the middle return CPAN::Distroprefs::Iterator->new(sub { LOOP: { my $fn = shift @files; return unless defined $fn; my ($ext) = $fn =~ $ext_re; my $loader = $ext_map->{$ext}; my $result = CPAN::Distroprefs::Result->new({ file => $fn, ext => $ext, dir => $dir }); # copied from CPAN.pm; is this ever actually possible? redo unless -f $result->abs; my $load_method = $self->_load_method($loader, $result); my @prefs = eval { $self->$load_method($loader, $result) }; if (my $err = $@) { if (ref($err) && eval { $err->isa('CPAN::Distroprefs::Result') }) { return $err; } # rethrow any exceptions that we did not generate die $err; } elsif (!@prefs) { # the loader should have handled this, but just in case: return $result->as_warning; } return $result->as_success({ prefs => [ map { CPAN::Distroprefs::Pref->new({ data => $_ }) } @prefs ], }); } }); } package CPAN::Distroprefs::Pref; use Carp (); sub new { bless $_[1] => $_[0] } sub data { shift->{data} } sub has_any_match { $_[0]->data->{match} ? 1 : 0 } sub has_match { my $match = $_[0]->data->{match} || return 0; exists $match->{$_[1]} || exists $match->{"not_$_[1]"} } sub has_valid_subkeys { grep { exists $_[0]->data->{match}{$_} } map { $_, "not_$_" } $_[0]->match_attributes } sub _pattern { my $re = shift; my $p = eval sprintf 'qr{%s}', $re; if ($@) { $@ =~ s/\n$//; die "Error in Distroprefs pattern qr{$re}\n$@"; } return $p; } sub _match_scalar { my ($match, $data) = @_; my $qr = _pattern($match); return $data =~ /$qr/; } sub _match_hash { my ($match, $data) = @_; for my $mkey (keys %$match) { (my $dkey = $mkey) =~ s/^not_//; my $val = defined $data->{$dkey} ? $data->{$dkey} : ''; if (_match_scalar($match->{$mkey}, $val)) { return 0 if $mkey =~ /^not_/; } else { return 0 if $mkey !~ /^not_/; } } return 1; } sub _match { my ($self, $key, $data, $matcher) = @_; my $m = $self->data->{match}; if (exists $m->{$key}) { return 0 unless $matcher->($m->{$key}, $data); } if (exists $m->{"not_$key"}) { return 0 if $matcher->($m->{"not_$key"}, $data); } return 1; } sub _scalar_match { my ($self, $key, $data) = @_; return $self->_match($key, $data, \&_match_scalar); } sub _hash_match { my ($self, $key, $data) = @_; return $self->_match($key, $data, \&_match_hash); } # do not take the order of C<keys %$match> because "module" is by far the # slowest sub match_attributes { qw(env distribution perl perlconfig module) } sub match_module { my ($self, $modules) = @_; return $self->_match("module", $modules, sub { my($match, $data) = @_; my $qr = _pattern($match); for my $module (@$data) { return 1 if $module =~ /$qr/; } return 0; }); } sub match_distribution { shift->_scalar_match(distribution => @_) } sub match_perl { shift->_scalar_match(perl => @_) } sub match_perlconfig { shift->_hash_match(perlconfig => @_) } sub match_env { shift->_hash_match(env => @_) } sub matches { my ($self, $arg) = @_; my $default_match = 0; for my $key (grep { $self->has_match($_) } $self->match_attributes) { unless (exists $arg->{$key}) { Carp::croak "Can't match pref: missing argument key $key"; } $default_match = 1; my $val = $arg->{$key}; # make it possible to avoid computing things until we have to if (ref($val) eq 'CODE') { $val = $val->() } my $meth = "match_$key"; return 0 unless $self->$meth($val); } return $default_match; } 1; __END__ =head1 NAME CPAN::Distroprefs -- read and match distroprefs =head1 SYNOPSIS use CPAN::Distroprefs; my %info = (... distribution/environment info ...); my $finder = CPAN::Distroprefs->find($prefs_dir, \%ext_map); while (my $result = $finder->next) { die $result->as_string if $result->is_fatal; warn($result->as_string), next if $result->is_warning; for my $pref (@{ $result->prefs }) { if ($pref->matches(\%info)) { return $pref; } } } =head1 DESCRIPTION This module encapsulates reading L<Distroprefs|CPAN> and matching them against CPAN distributions. =head1 INTERFACE my $finder = CPAN::Distroprefs->find($dir, \%ext_map); while (my $result = $finder->next) { ... } Build an iterator which finds distroprefs files in the tree below the given directory. Within the tree directories matching C<m/^[._]/> are pruned. C<%ext_map> is a hashref whose keys are file extensions and whose values are modules used to load matching files: { 'yml' => 'YAML::Syck', 'dd' => 'Data::Dumper', ... } Each time C<< $finder->next >> is called, the iterator returns one of two possible values: =over =item * a CPAN::Distroprefs::Result object =item * C<undef>, indicating that no prefs files remain to be found =back =head1 RESULTS L<C<find()>|/INTERFACE> returns CPAN::Distroprefs::Result objects to indicate success or failure when reading a prefs file. =head2 Common All results share some common attributes: =head3 type C<success>, C<warning>, or C<fatal> =head3 file the file from which these prefs were read, or to which this error refers (relative filename) =head3 ext the file's extension, which determines how to load it =head3 dir the directory the file was read from =head3 abs the absolute path to the file =head2 Errors Error results (warning and fatal) contain: =head3 msg the error message (usually either C<$!> or a YAML error) =head2 Successes Success results contain: =head3 prefs an arrayref of CPAN::Distroprefs::Pref objects =head1 PREFS CPAN::Distroprefs::Pref objects represent individual distroprefs documents. They are constructed automatically as part of C<success> results from C<find()>. =head3 data the pref information as a hashref, suitable for e.g. passing to Kwalify =head3 match_attributes returns a list of the valid match attributes (see the Distroprefs section in L<CPAN>) currently: C<env perl perlconfig distribution module> =head3 has_any_match true if this pref has a 'match' attribute at all =head3 has_valid_subkeys true if this pref has a 'match' attribute and at least one valid match attribute =head3 matches if ($pref->matches(\%arg)) { ... } true if this pref matches the passed-in hashref, which must have a value for each of the C<match_attributes> (above) =head1 LICENSE This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut