Module::ExtractUse - Find out what modules are used
use Module::ExtractUse; # get a parser my $p=Module::ExtractUse->new; # parse from a file $p->extract_use('/path/to/module.pm'); # or parse from a ref to a string in memory $p->extract_use(\$string_containg_code); # use some reporting methods my $used=$p->used; # $used is a HASHREF print $p->used('strict') # true if code includes 'use strict' my @used=$p->array; my $used=$p->string;
Module::ExtractUse is basically a Parse::RecDescent grammar to parse Perl code. It tries very hard to find all modules (whether pragmas, Core, or from CPAN) used by the parsed code.
"Usage" is defined by either calling
Returns a parser object
Runs the parser.
$code_to_parse can be either a SCALAR, in which case Module::ExtractUse tries to open the file specified in $code_to_parse. Or a reference to a SCALAR, in which case Module::ExtractUse assumes the referenced scalar contains the source code.
The code will be stripped from POD (using Pod::Strip) and split on ";" (semicolon). Each statement (i.e. the stuff between two semicolons) is checked by a simple regular expression.
If the statement contains either 'use' or 'require', the statment is handed over to the parser, who then tries to figure out, what is used or required. The results will be saved in a data structure that you can examine afterwards.
You can call
extract_use several times on different files. It will count how many files where examined and how often each module was used.
Those are various ways to get at the result of the parse.
extract_use returns the parser object, so you can say
my $used=$p->used; # $used is a HASHREF print $p->used('strict') # true if code includes 'use strict'
If called without an argument, returns a reference to an hash of all used modules. Keys are the names of the modules, values are the number of times they were used.
If called with an argument, looks up the value of the argument in the hash and returns the number of times it was found during parsing.
This is the preferred accessor.
Returns a sorted string of all used modules, joined using the value of
$seperator or using a blank space as a default;
Module names are sorted by ascii value (i.e by
my @array = $p->array;
Returns an array of all used modules.
my $arrayref = $p->arrayref;
Returns a reference to an array of all used modules. Surprise!
Returns the number of files parsed by the parser object.
If - for some reasons - you need to alter the grammar, edit the file grammar and afterwards run:
perl -MParse::RecDescent - grammar Module::ExtractUse::Grammar
Make sure you're in the right directory, i.e. in .../Module/ExtractUse/
Thomas Klausner <firstname.lastname@example.org>
This software is copyright (c) 2012 by Thomas Klausner.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.