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439 lines
8.4 KiB
Perl
439 lines
8.4 KiB
Perl
# -*- cperl -*-
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# Copyright (c) 2008 Sun Microsystems, Inc.
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# Use is subject to license terms.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; version 2 of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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package My::Config::Option;
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use strict;
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use warnings;
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sub new {
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my ($class, $option_name, $option_value)= @_;
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my $self= bless { name => $option_name,
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value => $option_value
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}, $class;
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return $self;
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}
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sub name {
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my ($self)= @_;
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return $self->{name};
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}
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sub value {
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my ($self)= @_;
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return $self->{value};
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}
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package My::Config::Group;
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use strict;
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use warnings;
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sub new {
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my ($class, $group_name)= @_;
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my $self= bless { name => $group_name,
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options => [],
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options_by_name => {},
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}, $class;
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return $self;
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}
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sub insert {
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my ($self, $option_name, $value, $if_not_exist)= @_;
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my $option= $self->option($option_name);
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if (defined($option) and !$if_not_exist) {
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$option->{value}= $value;
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}
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else {
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my $option= My::Config::Option->new($option_name, $value);
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# Insert option in list
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push(@{$self->{options}}, $option);
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# Insert option in hash
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$self->{options_by_name}->{$option_name}= $option;
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}
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return $option;
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}
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sub remove {
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my ($self, $option_name)= @_;
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# Check that option exists
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my $option= $self->option($option_name);
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return undef unless defined $option;
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# Remove from the hash
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delete($self->{options_by_name}->{$option_name}) or die;
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# Remove from the array
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@{$self->{options}}= grep { $_->name ne $option_name } @{$self->{options}};
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return $option;
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}
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sub options {
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my ($self)= @_;
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return @{$self->{options}};
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}
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sub name {
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my ($self)= @_;
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return $self->{name};
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}
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#
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# Return a specific option in the group
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#
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sub option {
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my ($self, $option_name)= @_;
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return $self->{options_by_name}->{$option_name};
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}
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#
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# Return a specific value for an option in the group
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#
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sub value {
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my ($self, $option_name)= @_;
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my $option= $self->option($option_name);
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die "No option named '$option_name' in this group"
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if ! defined($option);
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return $option->value();
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}
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package My::Config;
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use strict;
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use warnings;
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use IO::File;
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use File::Basename;
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#
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# Constructor for My::Config
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# - represents a my.cnf config file
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#
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# Array of arrays
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#
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sub new {
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my ($class, $path)= @_;
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my $group_name= undef;
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my $self= bless { groups => [] }, $class;
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my $F= IO::File->new($path, "<")
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or die "Could not open '$path': $!";
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while ( my $line= <$F> ) {
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chomp($line);
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# [group]
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if ( $line =~ /\[(.*)\]/ ) {
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# New group found
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$group_name= $1;
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#print "group: $group_name\n";
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$self->insert($group_name, undef, undef);
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}
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# Magic #! comments
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elsif ( $line =~ /^#\!/) {
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my $magic= $line;
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die "Found magic comment '$magic' outside of group"
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unless $group_name;
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#print "$magic\n";
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$self->insert($group_name, $magic, undef);
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}
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# Comments
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elsif ( $line =~ /^#/ || $line =~ /^;/) {
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# Skip comment
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next;
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}
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# Empty lines
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elsif ( $line =~ /^$/ ) {
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# Skip empty lines
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next;
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}
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# !include <filename>
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elsif ( $line =~ /^\!include\s*(.*?)\s*$/ ) {
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my $include_file_name= dirname($path)."/".$1;
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# Check that the file exists
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die "The include file '$include_file_name' does not exist"
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unless -f $include_file_name;
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$self->append(My::Config->new($include_file_name));
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}
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# <option>
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elsif ( $line =~ /^([\@\w-]+)\s*$/ ) {
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my $option= $1;
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die "Found option '$option' outside of group"
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unless $group_name;
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#print "$option\n";
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$self->insert($group_name, $option, undef);
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}
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# <option>=<value>
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elsif ( $line =~ /^([\@\w-]+)\s*=\s*(.*?)\s*$/ ) {
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my $option= $1;
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my $value= $2;
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die "Found option '$option=$value' outside of group"
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unless $group_name;
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#print "$option=$value\n";
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$self->insert($group_name, $option, $value);
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} else {
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die "Unexpected line '$line' found in '$path'";
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}
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}
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undef $F; # Close the file
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return $self;
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}
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#
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# Insert a new group if it does not already exist
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# and add option if defined
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#
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sub insert {
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my ($self, $group_name, $option, $value, $if_not_exist)= @_;
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my $group;
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# Create empty array for the group if it doesn't exist
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if ( !$self->group_exists($group_name) ) {
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$group= $self->_group_insert($group_name);
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}
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else {
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$group= $self->group($group_name);
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}
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if ( defined $option ) {
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#print "option: $option, value: $value\n";
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# Add the option to the group
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$group->insert($option, $value, $if_not_exist);
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}
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}
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#
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# Remove a option, given group and option name
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#
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sub remove {
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my ($self, $group_name, $option_name)= @_;
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my $group= $self->group($group_name);
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die "group '$group_name' does not exist"
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unless defined($group);
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$group->remove($option_name) or
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die "option '$option_name' does not exist";
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}
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#
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# Check if group with given name exists in config
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#
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sub group_exists {
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my ($self, $group_name)= @_;
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foreach my $group ($self->groups()) {
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return 1 if $group->{name} eq $group_name;
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}
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return 0;
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}
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#
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# Insert a new group into config
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#
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sub _group_insert {
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my ($self, $group_name)= @_;
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caller eq __PACKAGE__ or die;
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# Check that group does not already exist
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die "Group already exists" if $self->group_exists($group_name);
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my $group= My::Config::Group->new($group_name);
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push(@{$self->{groups}}, $group);
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return $group;
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}
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#
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# Append a configuration to current config
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#
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sub append {
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my ($self, $from)= @_;
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foreach my $group ($from->groups()) {
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foreach my $option ($group->options()) {
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$self->insert($group->name(), $option->name(), $option->value());
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}
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}
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}
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#
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# Return a list with all the groups in config
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#
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sub groups {
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my ($self)= @_;
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return ( @{$self->{groups}} );
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}
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#
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# Return a list of all the groups in config
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# starting with the given string
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#
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sub like {
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my ($self, $prefix)= @_;
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return ( grep ( $_->{name} =~ /^$prefix/, $self->groups()) );
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}
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#
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# Return the first group in config
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# starting with the given string
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#
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sub first_like {
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my ($self, $prefix)= @_;
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return ($self->like($prefix))[0];
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}
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#
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# Return a specific group in the config
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#
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sub group {
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my ($self, $group_name)= @_;
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foreach my $group ( $self->groups() ) {
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return $group if $group->{name} eq $group_name;
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}
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return undef;
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}
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#
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# Return a list of all options in a specific group in the config
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#
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sub options_in_group {
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my ($self, $group_name)= @_;
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my $group= $self->group($group_name);
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return () unless defined $group;
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return $group->options();
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}
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#
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# Return a value given group and option name
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#
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sub value {
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my ($self, $group_name, $option_name)= @_;
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my $group= $self->group($group_name);
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die "group '$group_name' does not exist"
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unless defined($group);
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my $option= $group->option($option_name);
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die "option '$option_name' does not exist"
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unless defined($option);
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return $option->value();
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}
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#
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# Check if an option exists
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#
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sub exists {
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my ($self, $group_name, $option_name)= @_;
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my $group= $self->group($group_name);
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die "group '$group_name' does not exist"
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unless defined($group);
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my $option= $group->option($option_name);
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return defined($option);
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}
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# Overload "to string"-operator with 'stringify'
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use overload
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'""' => \&stringify;
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#
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# Return the config as a string in my.cnf file format
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#
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sub stringify {
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my ($self)= @_;
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my $res;
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foreach my $group ($self->groups()) {
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$res .= "[$group->{name}]\n";
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foreach my $option ($group->options()) {
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$res .= $option->name();
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my $value= $option->value();
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if (defined $value) {
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$res .= "=$value";
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}
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$res .= "\n";
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}
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$res .= "\n";
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}
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return $res;
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}
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#
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# Save the config to named file
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#
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sub save {
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my ($self, $path)= @_;
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my $F= IO::File->new($path, ">")
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or die "Could not open '$path': $!";
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print $F $self;
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undef $F; # Close the file
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}
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1;
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