Badger::Utils
- NAME
- SYNOPSIS
- DESCRIPTION
- EXPORTABLE FUNCTIONS
- UTILS
- is_object($class,$object)
- textlike($item)
- numlike($item)
- params(@args)
- self_params(@args)
- odd_params(@_)
- plural($noun)
- module_file($name)
- camel_case($string) / CamelCase($string)
- dotid($text)
- xprintf($format,@args)
- random_name($length,@data)
- AUTHOR
- COPYRIGHT
use Badger::Utils 'blessed params';
sub example {
my $self = shift;
my $params = params(@_);
if (blessed $self) {
print "self is blessed\n";
}
}
This module implements a number of utility functions. It also provides access to all of the utility functions in Scalar::Util, List::Util, List::MoreUtils, Hash::Util and Digest::MD5 as a convenience.
use Badger::Utils 'blessed reftype first max any all lock_hash md5_hex';
The single line of code shown here will import blessed and
reftype from Scalar::Util, first and max from List::Util, any and
all from List::Util, lock_hash from Hash::Util, and md5_hex from
Digest::MD5.
These modules are loaded on demand so there's no overhead incurred if you don't use them (other than a lookup table so we know where to find them).
Badger::Utils can automatically load and export functions
defined in the Scalar::Util, List::Util, List::MoreUtils, Hash::Util and Digest::MD5 Perl modules.
It also does the same for functions and constants defined in the Badger modules Badger::Timestamp (TS, Timestamp() and Now()) and Badger::Logic (LOGIC and Logic()).
For example:
use Badger::Utils 'Now'; print Now->year; # prints the current year
The following exportable functions are also defined in
Badger::Utils
Returns true if the $object is a blessed reference which isa
$class.
use Badger::Filesystem 'FS';
use Badger::Utils 'is_object';
if (is_object( FS => $object )) { # FS == Badger::Filesystem
print $object, ' isa ', FS, "\n";
}
Returns true if $item is a non-reference scalar or an object
that has an overloaded stringification operator.
use Badger::Filesystem 'File';
use Badger::Utils 'textlike';
# Badger::Filesystem::File objects have overloaded string operator
my $file = File('example.txt');
print $file; # example.txt
print textlike $file ? 'ok' : 'not ok'; # ok
This is an alias to the looks_like_number() function defined
in Scalar::Util.
Method to coerce a list of named parameters to a hash array reference. If the first argument is a reference to a hash array then it is returned. Otherwise the arguments are folded into a hash reference.
use Badger::Utils 'params';
params({ a => 10 }); # { a => 10 }
params( a => 10 ); # { a => 10 }
Pro Tip: If you're getting warnings about an "Odd number of elements in
anonymous hash" then try enabling debugging in
Badger::Utils. To do this, add the following to the start of
your program before you've loaded Badger::Utils:
use Badger::Debug
modules => 'Badger::Utils'
When debugging is enabled in Badger::Utils you'll get a full
stack backtrace showing you where the subroutine was called from. e.g.
Badger::Utils::self_params() called with an odd number of arguments: <undef> #1: Called from Foo::bar in /path/to/Foo/Bar.pm at line 210 #2: Called from Wam::bam in /path/to/Wam/Bam.pm at line 420 #3: Called from main in /path/to/your/script.pl at line 217
Similar to params() but also expects a
$self reference at the start of the argument list.
use Badger::Utils 'self_params';
sub example {
my ($self, $params) = self_params(@_);
# do something...
}
If you enable debugging in Badger::Utils then you'll get a
stack backtrace in the event of an odd number of parameters being passed
to this function. See params() for further
details.
This is an internal function used by params() and self_params() to report any attempt to
pass an odd number of arguments to either of them. It can be enabled by
setting $Badger::Utils::DEBUG to a true value.
use Badger::Utils 'params'; $Badger::Utils::DEBUG = 1; my $hash = params( foo => 10, 20 ); # oops!
The above code will raise a warning showing the arguments passed and a stack backtrace, allowing you to easily track down and fix the offending code. Apart from obvious typos like the above, this is most likely to happen if you call a function or methods that returns an empty list. e.g.
params(
foo => 10,
bar => get_the_bar_value(),
);
If get_the_bar_value() returns an empty list then you'll end
up with an odd number of elements being passed to params().
You can correct this by providing undef as an alternative
value. e.g.
params(
foo => 10,
bar => get_the_bar_value() || undef,
);
The function makes a very naive attempt at pluralising the singular noun word passed as an argument.
If the $noun word ends in ss, sh,
ch or x then es will be added to
the end of it.
print plural('class'); # classes
print plural('hash'); # hashes
print plural('patch'); # patches
print plural('box'); # boxes
If it ends in y then it will be replaced with
ies.
print plural('party'); # parties
In all other cases, s will be added to the end of the word.
print plural('device'); # devices
It will fail miserably on many common words.
print plural('woman'); # womans FAIL!
print plural('child'); # childs FAIL!
print plural('foot'); # foots FAIL!
This function should only be used in cases where the singular noun
is known in advance and has a regular form that can be pluralised
correctly by the algorithm described above. For example, the Badger::Factory module allows you to
specify $ITEM and $ITEMS package variable to
provide the singular and plural names of the items that the factory
manages.
our $ITEM = 'person'; our $ITEMS = 'people';
If the singular noun is sufficiently regular then the $ITEMS
can be omitted and the plural function will be used.
our $ITEM = 'codec'; # $ITEMS defaults to 'codecs'
In this case we know that codec will pluralise correctly to
codecs and can safely leave $ITEMS undefined.
For more robust pluralisation of English words, you should use the Lingua::EN::Inflect module by Damian Conway. For further information on the difficulties of correctly pluralising English, and details of the implementation of Lingua::EN::Inflect, see Damian's paper "An Algorithmic Approach to English Pluralization" at http://www.csse.monash.edu.au/~damian/papers/HTML/Plurals.html
Returns the module name passed as an argument as a relative filesystem
path suitable for feeding into require()
print module_file('My::Module'); # My/Module.pm
Converts a lower case string where words are separated by underscores
(e.g. like_this_example) into CamelCase where each word is
capitalised and words are joined together (e.g.
LikeThisExample).
According to Perl convention (and personal preference), we use the lower case form wherever possible. However, Perl's convention also dictates that module names should be in CamelCase. This function performs that conversion.
The function returns a lower case representation of the text passed as an argument with all non-word character sequences replaced with dots.
print dotid('Foo::Bar'); # foo.bar
A wrapper around sprintf() which provides some syntactic
sugar for embedding positional parameters.
xprintf('The <2> sat on the <1>', 'mat', 'cat');
xprintf('The <1> costs <2:%.2f>', 'widget', 11.99);
Andy Wardley http://wardley.org/