1Module::ExtractUse(3) User Contributed Perl DocumentationModule::ExtractUse(3)
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6 Module::ExtractUse - Find out what modules are used
7
9 version 0.343
10
12 use Module::ExtractUse;
13 # get a parser
15 my $p=Module::ExtractUse->new;
16 # parse from a file
18 $p->extract_use('/path/to/module.pm');
19 # or parse from a ref to a string in memory
21 $p->extract_use(\$string_containg_code);
22 # use some reporting methods
24 my $used=$p->used; # $used is a HASHREF
25 print $p->used('strict') # true if code includes 'use strict'
26 my @used=$p->array;
28 my $used=$p->string;
29 # you can get optional modules, that is use in eval context, in the same style
31 my $used=$p->used_in_eval; # $used is a HASHREF
32 print $p->used_in_eval('strict') # true if code includes 'use strict'
33 my @used=$p->array_in_eval;
35 my $used=$p->string_in_eval;
36 # and mandatory modules, that is use out of eval context, in the same style, also.
38 my $used=$p->used_out_of_eval; # $used is a HASHREF
39 print $p->used_out_of_eval('strict') # true if code includes 'use strict'
40 my @used=$p->array_out_of_eval;
42 my $used=$p->string_out_of_eval;
43
45 Module::ExtractUse is basically a Parse::RecDescent grammar to parse
46 Perl code. It tries very hard to find all modules (whether pragmas,
47 Core, or from CPAN) used by the parsed code.
48 "Usage" is defined by either calling "use" or "require".
50 Methods
52 new
53 my $p=Module::ExtractUse->new;
55 Returns a parser object
57 extract_use
59 $p->extract_use('/path/to/module.pm');
61 $p->extract_use(\$string_containg_code);
62 Runs the parser.
64 $code_to_parse can be either a SCALAR, in which case Module::ExtractUse
66 tries to open the file specified in $code_to_parse. Or a reference to a
67 SCALAR, in which case Module::ExtractUse assumes the referenced scalar
68 contains the source code.
69 The code will be stripped from POD (using Pod::Strip) and split on ";"
71 (semicolon). Each statement (i.e. the stuff between two semicolons) is
72 checked by a simple regular expression.
73 If the statement contains either 'use' or 'require', the statement is
75 handed over to the parser, who then tries to figure out, what is used
76 or required. The results will be saved in a data structure that you can
77 examine afterwards.
78 You can call "extract_use" several times on different files. It will
80 count how many files where examined and how often each module was used.
81 Accessor Methods
83 Those are various ways to get at the result of the parse.
84 Note that "extract_use" returns the parser object, so you can say
86 print $p->extract_use($code_to_parse)->string;
88 used
90 my $used=$p->used; # $used is a HASHREF
92 print $p->used('strict') # true if code includes 'use strict'
93 If called without an argument, returns a reference to an hash of all
95 used modules. Keys are the names of the modules, values are the number
96 of times they were used.
97 If called with an argument, looks up the value of the argument in the
99 hash and returns the number of times it was found during parsing.
100 This is the preferred accessor.
102 used_in_eval
104 Same as "used", except for considering in-eval-context only.
106 used_out_of_eval
108 Same as "used", except for considering NOT-in-eval-context only.
110 required
112 Same as "used", except for considering 'require'd modules only.
114 required_in_eval
116 Same as "required", except for considering in-eval-context only.
118 required_out_of_eval
120 Same as "required", except for considering NOT-in-eval-context only.
122 noed
124 Same as "used", except for considering 'no'ed modules only.
126 noed_in_eval
128 Same as "noed", except for considering in-eval-context only.
130 noed_out_of_eval
132 Same as "noed", except for considering NOT-in-eval-context only.
134 string
136 print $p->string($seperator)
138 Returns a sorted string of all used modules, joined using the value of
140 $seperator or using a blank space as a default;
141 Module names are sorted by ascii value (i.e by "sort")
143 string_in_eval
145 Same as "string", except for considering in-eval-context only.
147 string_out_of_eval
149 Same as "string", except for considering NOT-in-eval-context only.
151 array
153 my @array = $p->array;
155 Returns an array of all used modules.
157 array_in_eval
159 Same as "array", except for considering in-eval-context only.
161 array_out_of_eval
163 Same as "array", except for considering NOT-in-eval-context only.
165 arrayref
167 my $arrayref = $p->arrayref;
169 Returns a reference to an array of all used modules. Surprise!
171 arrayref_in_eval
173 Same as "array_ref", except for considering in-eval-context only.
175 arrayref_out_of_eval
177 Same as "array_ref", except for considering NOT-in-eval-context only.
179 files
181 Returns the number of files parsed by the parser object.
183
185 If - for some reasons - you need to alter the grammar, edit the file
186 grammar and afterwards run:
187 perl -MParse::RecDescent - grammar Module::ExtractUse::Grammar
189 Make sure you're in the right directory, i.e. in .../Module/ExtractUse/
191
193 Nothing.
194
196 Parse::RecDescent, Module::Extract::Use, Module::ScanDeps,
197 Module::Info, Module::CPANTS::Analyse, Perl::PrereqScanner,
198 Perl::PrereqScanner::Lite, Perl::PrereqScanner::NotQuiteLite
199
201 · Anthony Brummett <https://github.com/brummett> implemented support
202 for Module::Runtime and Class::Load while participating in the CPAN
203 Pull Request Challenge <http://cpan-prc.org/>
204 · Jeremy Mates <https://github.com/thrig> fixed some documentation
206 errors
207 · Jonathan Yu provided a nice script, "example/extractuse.pl"
209 If I forgot to mention your contribution, please send an email or open
211 an issue / ticket.
212
214 · Thomas Klausner <domm@cpan.org>
215 · Kenichi Ishigaki <kishigaki@gmail.com>
217
219 This software is copyright (c) 2014 by Thomas Klausner.
220 This is free software; you can redistribute it and/or modify it under
222 the same terms as the Perl 5 programming language system itself.
223perl v5.28.1 2019-02-02 Module::ExtractUse(3)