Sendpage::KeesConf(3) User Contributed Perl DocumentationSendpage::KeesConf(3)NAMESendpage::KeesConf - implements a configuration file reader
SYNOPSIS
use Sendpage::KeesConf;
$config = Sendpage::KeesConf->new();
$config->define("variable", { DEFAULT => "setting" });
$config->file("config.cfg");
$setting=$config->get("variable");
DESCRIPTION
I have borrowed VERY heavily from Andy Wardley's (abw@cre.canon.co.uk)
"AppConfig" tool, which can be found on CPAN (http://cpan.perl.org) but
I found it not dynamic enough for multi-instance variable defaults. As
a result, I wrote this massively trimmed-down version for my use.
The following methods are available:
$config = Sendpage::KeesConf->new();
The constructor doesn't take an arguement, but it should in the
future.
$config->forget();
This call will make $config forget about any variables it has
loaded. It does NOT forget "define"d variables, just instantiated
ones via "file".
$config->define($name, $options);
This will define a variable by the name of $name.
$options can contain:
ARGCOUNT
What type of variable this should be. Default value is "1".
The available types are:
0 Boolean (true/false, yes/no, 1/0)
1 Scalar (any string)
2 List (an array of strings)
DEFAULT
The default value the variable should have if it is not
overridden during the call to "file". The DEFAULT must be the
same data type as ARGCOUNT. The default DEFAULT is the string
"<unset>".
UNSET
set this to 1 if you want the default value to be undefined.
This is a hack to get around the default DEFAULT.
$config->instance_exists($name);
This tests to see if there is a section loaded named $name
$var=$config->ifset($name);
This call will search for the variable named $name. If it is not
found, it will return undef. If the value exists, it will return
the value. This is a way to call "get" without having a default
passed through.
$var=$config->exists($name);
This call will search for the variable named $name. If it is not
found, it will return false. If the value exists, it will return
true. This is a way for the user to find out if they will get a
"default" on a call to "get".
$var=$config->fallbackget($name,$quiet);
This call will search for the variable named $name. If it is not
found, the section portion will be removed, and retried for a
sectionless "get" call.
That way, global variables can be overridden by section-specific
variables. If "SECTION:Instance@name" does not exist, "name" will
be tried.
$var=$config->get($name);
This call will search for the variable named $name. If it is not
found, it will fall back to the default for the section. Sections
are explained in more detail later.
$config->instances($class);
Returns an array of the names of all the variables in the class
$class.
$config->file('program.cfg');
Loads variables from the named file. Syntax for this file is:
[SECTION:INSTANCE]
VARIABLE1 = VALUE1
VARIABLE2 = VALUE2
.
.
.
If VARIABLE is an array, VALUE is loaded using commas (,) as the
list separator. The variable will be available under the name of
the section. For example, to see VALUE2, it would be accessed as:
$config->get("SECTION:INSTANCE\@VARIABLE2");
Notice, that "=", ":", and "@" are all not allowed in section or
variable names.
Sections can be defined (and loaded) so that defaults can pass back to
a defined section default. For example, lets say that you have several
modems, and most of them have different settings. You can define all
the modem variables like so:
$config->define("modem:baud",{ DEFAULT => 9600 });
$config->define("modem:flowctl",{ DEFAULT => "hardware" });
Then, when you load them, let's say the config file has:
[modem:sportster]
baud = 115200
[modem:hayes]
The baud rate for the sportster will come back as 115200, but the hayes
will fall back during a "get" call, and find the default for the modem
section: 9600. Both fallback to have "flowctl" as "hardware":
# returns specific value 115200
$config->get("modem:sportster\@baud");
# returns default value 9600
$config->get("modem:hayes\@baud");
# both return default value "hardware"
$config->get("modem:sportster\@flowctl");
$config->get("modem:hayes\@flowctl");
CAVEATS
character limitations
As mentioned above, variable names (and section names) cannot have
the characters ":", "@", or "=" in them.
default defaults
There should be a way to pass default defaults into "new". That
would be handy, and could eliminate the need for the UNSET option
in "define".
AUTHOR
Kees Cook <kees@outflux.net>
SEE ALSOperl(1), sendpage(1), Sendpage::KeesLog(3), Sendpage::Modem(3),
Sendpage::PagingCentral(3), Sendpage::PageQueue(3), Sendpage::Page(3),
Sendpage::Recipient(3), Sendpage::Queue(3)COPYRIGHT
Copyright 2000 Kees Cook.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
POD ERRORS
Hey! The above document had some coding errors, which are explained
below:
Around line 119:
Expected text after =item, not a number
Around line 123:
Expected text after =item, not a number
perl v5.18.2 2008-01-03 Sendpage::KeesConf(3)
