NAME

Module::ExtractUse - Find out what modules are used

VERSION

version 0.27

SYNOPSIS

  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;

DESCRIPTION

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 use or require.

Methods

new

 my $p=Module::ExtractUse->new;

Returns a parser object

extract_use

  $p->extract_use('/path/to/module.pm');
  $p->extract_use(\$string_containg_code);

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.

Accessor Methods

Those are various ways to get at the result of the parse.

Note that extract_use returns the parser object, so you can say

  print $p->extract_use($code_to_parse)->string;

used

    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.

string

    print $p->string($seperator)

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 sort)

array

    my @array = $p->array;

Returns an array of all used modules.

arrayref

    my $arrayref = $p->arrayref;

Returns a reference to an array of all used modules. Surprise!

files

Returns the number of files parsed by the parser object.

RE-COMPILING THE GRAMMAR

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/

EXPORTS

Nothing.

SEE ALSO

Parse::RecDescent, Module::ScanDeps, Module::Info, Module::CPANTS::Analyse

AUTHOR

Thomas Klausner <domm@cpan.org>

COPYRIGHT AND LICENSE

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.

cpanm Module::ExtractUse

perl -MCPAN -e shell
install Module::ExtractUse