package Config::Any;
-# $Id: $
-use warnings;
+
use strict;
+use warnings;
+
use Carp;
use Module::Pluggable::Object ();
-our $VERSION = (qw$Rev: $)[-1];
+
+our $VERSION = '0.09';
+
+=head1 NAME
+
+Config::Any - Load configuration from different file formats, transparently
+
+=head1 VERSION
+
+This document describes Config::Any version 0.09
+
+=head1 SYNOPSIS
+
+ use Config::Any;
+
+ my $cfg = Config::Any->load_stems({stems => \@filepath_stems, ... });
+ # or
+ my $cfg = Config::Any->load_files({files => \@filepaths, ... });
+
+ for (@$cfg) {
+ my ($filename, $config) = each %$_;
+ $class->config($config);
+ warn "loaded config from file: $filename";
+ }
+
+=head1 DESCRIPTION
+
+L<Config::Any|Config::Any> provides a facility for Perl applications and libraries
+to load configuration data from multiple different file formats. It supports XML, YAML,
+JSON, Apache-style configuration, Windows INI files, and even Perl code.
+
+The rationale for this module is as follows: Perl programs are deployed on many different
+platforms and integrated with many different systems. Systems administrators and end
+users may prefer different configuration formats than the developers. The flexibility
+inherent in a multiple format configuration loader allows different users to make
+different choices, without generating extra work for the developers. As a developer
+you only need to learn a single interface to be able to use the power of different
+configuration formats.
+
+=head1 INTERFACE
+
+=cut
+
+=head2 load_files( \%args )
+
+ Config::Any->load_files( { files => \@files } );
+ Config::Any->load_files( { files => \@files, filter => \&filter } );
+ Config::Any->load_files( { files => \@files, use_ext => 1 } );
+
+C<load_files()> attempts to load configuration from the list of files passed in
+the C<files> parameter, if the file exists.
+
+If the C<filter> parameter is set, it is used as a callback to modify the configuration
+data before it is returned. It will be passed a single hash-reference parameter which
+it should modify in-place.
+
+If the C<use_ext> parameter is defined, the loader will attempt to parse the file
+extension from each filename and will skip the file unless it matches a standard
+extension for the loading plugins. Only plugins whose standard extensions match the
+file extension will be used. For efficiency reasons, its use is encouraged, but
+be aware that you will lose flexibility -- for example, a file called C<myapp.cfg>
+containing YAML data will not be offered to the YAML plugin, whereas C<myapp.yml>
+or C<myapp.yaml> would be.
+
+C<load_files()> also supports a 'force_plugins' parameter, whose value should be an
+arrayref of plugin names like C<Config::Any::INI>. Its intended use is to allow the use
+of a non-standard file extension while forcing it to be offered to a particular parser.
+It is not compatible with 'use_ext'.
+
+You can supply a C<driver_args> hashref to pass special options to a particular
+parser object. Example:
+
+ Config::Any->load_files( { files => \@files, driver_args => {
+ General => { -LowerCaseNames => 1 }
+ } )
+
+=cut
sub load_files {
- my ($class, $args) = @_;
- croak "load_files requires a hashref argument" unless defined $args;
- croak "no files specified!" unless defined $args->{files};
- my $files = [ grep { -f $_ } @{$args->{files}} ];
- my $filter_cb = delete $args->{filter};
- return $class->_load($files, $filter_cb);
+ my ( $class, $args ) = @_;
+
+ unless ( $args && exists $args->{ files } ) {
+ warn "No files specified!";
+ return;
+ }
+
+ return $class->_load( $args );
}
+=head2 load_stems( \%args )
+
+ Config::Any->load_stems( { stems => \@stems } );
+ Config::Any->load_stems( { stems => \@stems, filter => \&filter } );
+ Config::Any->load_stems( { stems => \@stems, use_ext => 1 } );
+
+C<load_stems()> attempts to load configuration from a list of files which it generates
+by combining the filename stems list passed in the C<stems> parameter with the
+potential filename extensions from each loader, which you can check with the
+C<extensions()> classmethod described below. Once this list of possible filenames is
+built it is treated exactly as in C<load_files()> above, as which it takes the same
+parameters. Please read the C<load_files()> documentation before using this method.
+
+=cut
+
sub load_stems {
- my ($class, $args) = @_;
- croak "load_stems requires a hashref argument" unless defined $args;
- croak "no stems specified!" unless defined $args->{stems};
- my $filter_cb = delete $args->{filter};
- my $stems = $args->{stems};
+ my ( $class, $args ) = @_;
+
+ unless ( $args && exists $args->{ stems } ) {
+ warn "No stems specified!";
+ return;
+ }
+
+ my $stems = delete $args->{ stems };
my @files;
- STEM:
- for my $s (@$stems) {
- EXT:
- for my $ext ($class->extensions) {
- my $file = "$s.$ext";
- next EXT unless -f $file;
- push @files, $file;
- last EXT;
+ for my $s ( @$stems ) {
+ for my $ext ( $class->extensions ) {
+ push @files, "$s.$ext";
}
}
- return $class->_load(\@files, $filter_cb);
+
+ $args->{ files } = \@files;
+ return $class->_load( $args );
}
+# this is where we do the real work
+# it's a private class-method because users should use the interface described
+# in the POD.
sub _load {
- my ($class, $files_ref, $filter_cb) = @_;
+ my ( $class, $args ) = @_;
+ my ( $files_ref, $filter_cb, $use_ext, $force_plugins_ref )
+ = @{ $args }{ qw(files filter use_ext force_plugins) };
croak "_load requires a arrayref of file paths" unless defined $files_ref;
- my $final_configs = [];
+ my %files = map { $_ => 1 } @$files_ref;
+ my %force_plugins = map { $_ => 1 } @$force_plugins_ref;
+ my $enforcing = keys %force_plugins ? 1 : 0;
+
+ my $final_configs = [];
+ my $originally_loaded = {};
+ # perform a separate file loop for each loader
for my $loader ( $class->plugins ) {
- for my $filename (@$files_ref) {
- my $config = $loader->load( $filename );
+ next if $enforcing && not defined $force_plugins{ $loader };
+ last unless keys %files;
+ my %ext = map { $_ => 1 } $loader->extensions;
+
+ my ( $loader_class ) = $loader =~ /::([^:]+)$/;
+ my $driver_args = $args->{ driver_args }{ $loader_class } || {};
+
+ FILE:
+ for my $filename ( keys %files ) {
+ next unless -f $filename;
+
+ # use file extension to decide whether this loader should try this file
+ # use_ext => 1 hits this block
+ if ( defined $use_ext && !$enforcing ) {
+ my $matched_ext = 0;
+ EXT:
+ for my $e ( keys %ext ) {
+ next EXT unless $filename =~ m{ \. $e \z }xms;
+ next FILE unless exists $ext{ $e };
+ $matched_ext = 1;
+ }
+
+ next FILE unless $matched_ext;
+ }
+
+ my $config;
+ eval { $config = $loader->load( $filename, $driver_args ); };
+
+ next if $@; # if it croaked or warned, we can't use it
next if !$config;
+ delete $files{ $filename };
+
+ # post-process config with a filter callback, if we got one
$filter_cb->( $config ) if defined $filter_cb;
+
push @$final_configs, { $filename => $config };
}
}
- $final_configs;
+
+ return $final_configs;
}
+=head2 finder( )
+
+The C<finder()> classmethod returns the
+L<Module::Pluggable::Object|Module::Pluggable::Object>
+object which is used to load the plugins. See the documentation for that module for
+more information.
+
+=cut
+
sub finder {
- my $class = shift;
+ my $class = shift;
my $finder = Module::Pluggable::Object->new(
search_path => [ __PACKAGE__ ],
require => 1
);
- $finder;
+ return $finder;
}
+=head2 plugins( )
+
+The C<plugins()> classmethod returns the names of configuration loading plugins as
+found by L<Module::Pluggable::Object|Module::Pluggable::Object>.
+
+=cut
+
sub plugins {
my $class = shift;
return $class->finder->plugins;
}
-sub extensions {
- my $class = shift;
- return [ map { $_->extensions } $class->plugins ];
-}
-
-1; # Magic true value required at end of module
-__END__
-
-=head1 NAME
-
-Config::Any - [One line description of module's purpose here]
+=head2 extensions( )
+The C<extensions()> classmethod returns the possible file extensions which can be loaded
+by C<load_stems()> and C<load_files()>. This may be useful if you set the C<use_ext>
+parameter to those methods.
-=head1 VERSION
-
-This document describes Config::Any version 0.0.4
-
-
-=head1 SYNOPSIS
-
- use Config::Any;
-
- my $cfg = Config::Any->load_stems({stems => \@filepath_stems, ... });
- # or
- my $cfg = Config::Any->load_files({files => \@filepaths, ... });
-
- for (@$cfg) {
- my ($filename, $config) = each %$_;
- $class->config($config);
- warn "loaded config from file: $filename";
- }
-
-=head1 DESCRIPTION
-
-=for author to fill in:
- Write a full description of the module and its features here.
- Use subsections (=head2, =head3) as appropriate.
-
-
-=head1 INTERFACE
-
-=for author to fill in:
- Write a separate section listing the public components of the modules
- interface. These normally consist of either subroutines that may be
- exported, or methods that may be called on objects belonging to the
- classes provided by the module.
+=cut
+sub extensions {
+ my $class = shift;
+ my @ext = map { $_->extensions } $class->plugins;
+ return wantarray ? @ext : \@ext;
+}
=head1 DIAGNOSTICS
-=for author to fill in:
- List every single error and warning message that the module can
- generate (even the ones that will "never happen"), with a full
- explanation of each problem, one or more likely causes, and any
- suggested remedies.
-
=over
-=item C<< Error message here, perhaps with %s placeholders >>
-
-[Description of error here]
+=item C<No files specified!> or C<No stems specified!>
-=item C<< Another error message here >>
+The C<load_files()> and C<load_stems()> methods will issue this warning if
+called with an empty list of files/stems to load.
-[Description of error here]
+=item C<_load requires a arrayref of file paths>
-[Et cetera, et cetera]
+This fatal error will be thrown by the internal C<_load> method. It should not occur
+but is specified here for completeness. If your code dies with this error, please
+email a failing test case to the authors below.
=back
-
=head1 CONFIGURATION AND ENVIRONMENT
-=for author to fill in:
- A full explanation of any configuration system(s) used by the
- module, including the names and locations of any configuration
- files, and the meaning of any environment variables or properties
- that can be set. These descriptions must also include details of any
- configuration language used.
-
Config::Any requires no configuration files or environment variables.
-
=head1 DEPENDENCIES
-=for author to fill in:
- A list of all the other modules that this module relies upon,
- including any restrictions on versions, and an indication whether
- the module is part of the standard Perl distribution, part of the
- module's distribution, or must be installed separately. ]
-
-None.
+L<Module::Pluggable|Module::Pluggable>
+And at least one of the following:
+L<Config::General|Config::General>
+L<Config::Tiny|Config::Tiny>
+L<JSON|JSON>
+L<YAML|YAML>
+L<JSON::Syck|JSON::Syck>
+L<YAML::Syck|YAML::Syck>
+L<XML::Simple|XML::Simple>
=head1 INCOMPATIBILITIES
-=for author to fill in:
- A list of any modules that this module cannot be used in conjunction
- with. This may be due to name conflicts in the interface, or
- competition for system or program resources, or due to internal
- limitations of Perl (for example, many modules that use source code
- filters are mutually incompatible).
-
None reported.
-
=head1 BUGS AND LIMITATIONS
-=for author to fill in:
- A list of known problems with the module, together with some
- indication Whether they are likely to be fixed in an upcoming
- release. Also a list of restrictions on the features the module
- does provide: data types that cannot be handled, performance issues
- and the circumstances in which they may arise, practical
- limitations on the size of data sets, special cases that are not
- (yet) handled, etc.
-
No bugs have been reported.
Please report any bugs or feature requests to
C<bug-config-any@rt.cpan.org>, or through the web interface at
L<http://rt.cpan.org>.
-
=head1 AUTHOR
-Joel Bernstein C<< <rataxis@cpan.org> >>
+Joel Bernstein E<lt>rataxis@cpan.orgE<gt>
+
+=head1 CONTRIBUTORS
+
+This module was based on the original
+L<Catalyst::Plugin::ConfigLoader|Catalyst::Plugin::ConfigLoader>
+module by Brian Cassidy C<< <bricas@cpan.org> >>.
+With ideas and support from Matt S Trout C<< <mst@shadowcatsystems.co.uk> >>.
+
+Further enhancements suggested by Evan Kaufman C<< <evank@cpan.org> >>.
=head1 LICENCE AND COPYRIGHT
Copyright (c) 2006, Portugal Telecom C<< http://www.sapo.pt/ >>. All rights reserved.
+Portions copyright 2007, Joel Bernstein C<< <rataxis@cpan.org> >>.
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself. See L<perlartistic>.
-
=head1 DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
+
+=head1 SEE ALSO
+
+L<Catalyst::Plugin::ConfigLoader|Catalyst::Plugin::ConfigLoader>
+-- now a wrapper around this module.
+
+=cut
+
+"Drink more beer";
projects / p5sagit/Config-Any.git / blobdiff