trusty (3) Config::Model::Backend::IniFile.3pm.gz
NAME
Config::Model::Backend::IniFile - Read and write config as a INI file
VERSION
version 2.047
SYNOPSIS
use Config::Model;
use Log::Log4perl qw(:easy);
Log::Log4perl->easy_init($WARN);
my $model = Config::Model->new;
$model->create_config_class (
name => "IniClass",
element => [
[qw/foo bar/] => {
type => 'list',
cargo => {qw/type leaf value_type string/}
}
]
);
# model for free INI class name and constrained class parameters
$model->create_config_class(
name => "MyClass",
element => [
'ini_class' => {
type => 'hash',
index_type => 'string',
cargo => {
type => 'node',
config_class_name => 'IniClass'
},
},
],
read_config => [
{
backend => 'IniFile',
config_dir => '/tmp',
file => 'foo.conf',
store_class_in_hash => 'ini_class',
auto_create => 1,
}
],
);
my $inst = $model->instance(root_class_name => 'MyClass' );
my $root = $inst->config_root ;
$root->load('ini_class:ONE foo=FOO1 bar=BAR1 -
ini_class:TWO foo=FOO2' );
$inst->write_back ;
Now "/tmp/foo.conf" will contain:
## file written by Config::Model
[ONE]
foo=FOO1
bar=BAR1
[TWO]
foo=FOO2
DESCRIPTION
This module is used directly by Config::Model to read or write the content of a configuration tree
written with INI syntax in "Config::Model" configuration tree.
This INI file can have arbitrary comment delimiter. See the example in the SYNOPSIS that sets a semi-
column as comment delimiter. By default the comment delimiter is '#' like in Shell or Perl.
Note that undefined values are skipped for list element. I.e. if a list element contains
"('a',undef,'b')", the data structure will contain 'a','b'.
Comments
This backend tries to read and write comments from configuration file. The comments are stored as
annotation within the configuration tree. Bear in mind that comments extraction is based on best
estimation as to which parameter the comment may apply. Wrong estimations are possible.
CONSTRUCTOR
new ( node => $node_obj, name => 'inifile' ) ;
Inherited from Config::Model::Backend::Any. The constructor will be called by Config::Model::BackendMgr.
Parameters
Optional parameters declared in the model:
comment_delimiter
Change the character that starts comments in the INI file. Default is '"#"'.
store_class_in_hash
See "Arbitrary class name"
section_map
Is a kind of exception of the above rule. See also "Arbitrary class name"
force_lc_section
Boolean. When set, sections names are converted to lowercase.
force_lc_key
Idem for key name
force_lc_value
Idem for all values.
split_list_value
Some INI values are in fact a list of items separated by a space or a comma. This parameter
specifies the regex to use to split the value into a list. This applies only to "list" elements.
join_list_value
Conversely, the list element split with "split_list_value" needs to be written back with a string to
join them. Specify this string (usually ' ' or ', ') with "join_list_value".
write_boolean_as
Array ref. Reserved for boolean value. Specify how to write a boolean value. Default is "[0,1]"
which may not be the most readable. "write_boolean_as" can be specified as "['false','true']" or
"['no','yes']".
Mapping between INI structure and model
INI file typically have the same structure with 2 different conventions. The class names can be imposed
by the application or may be chosen by user.
Imposed class name
In this case, the class names must match what is expected by the application. The elements of each class
can be different. For instance:
foo = foo_v
[ A ]
bar = bar_v
[ B ]
baz = baz_v
In this case, class "A" and class "B" will not use the same configuration class.
The model will have this structure:
Root class
|- leaf element foo
|- node element A of class_A
| \- leaf element bar
\- node element B of class_B
\- leaf element baz
Arbitrary class name
In this case, the class names can be chosen by the end user. Each class will have the same elements. For
instance:
foo = foo_v
[ A ]
bar = bar_v1
[ B ]
bar = bar_v2
In this case, class "A" and class "B" will not use the same configuration class. The model will have
this structure:
Root class
|- leaf foo
\- hash element my_class_holder
|- key A (value is node of class_A)
| \- element-bar
\- key B (value is node of class_A)
\- element-bar
In this case, the "my_class_holder" name is specified in "read_config" with "store_class_in_hash"
parameter:
read_config => [
{
backend => 'IniFile',
config_dir => '/tmp',
file => 'foo.ini',
store_class_in_hash => 'my_class_holder',
}
],
Of course they are exceptions. For instance, in "Multistrap", the "[General]" INI class must be mapped to
a specific node object. This can be specified with the "section_map" parameter:
read_config => [
{
backend => 'IniFile',
config_dir => '/tmp',
file => 'foo.ini',
store_class_in_hash => 'my_class_holder',
section_map => {
General => 'general_node',
}
}
],
"section_map" can also map an INI class to the root node:
read_config => [
{
backend => 'ini_file',
store_class_in_hash => 'sections',
section_map => {
General => '!'
},
}
],
Methods
read ( io_handle => ... )
Of all parameters passed to this read call-back, only "io_handle" is used. This parameter must be
IO::File object already opened for read.
It can also be undef. In this case, "read()" will return 0.
When a file is read, "read()" will return 1.
write ( io_handle => ... )
Of all parameters passed to this write call-back, only "io_handle" is used. This parameter must be
IO::File object already opened for write.
"write()" will return 1.
AUTHOR
Dominique Dumont, (ddumont at cpan dot org); Krzysztof Tyszecki, (krzysztof.tyszecki at gmail dot com)
SEE ALSO
Config::Model, Config::Model::BackendMgr, Config::Model::Backend::Any,
AUTHOR
Dominique Dumont
COPYRIGHT AND LICENSE
This software is Copyright (c) 2013 by Dominique Dumont.
This is free software, licensed under:
The GNU Lesser General Public License, Version 2.1, February 1999