1Perl::Critic::DynamicPoUlsiecry(C3o)ntributed Perl DocumPeenrtla:t:iCornitic::DynamicPolicy(3)
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NAME

6       Perl::Critic::DynamicPolicy - Base class for dynamic Policies
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DESCRIPTION

9       Perl::Critic::DynamicPolicy is intended to be used as a base class for
10       Perl::Critic::Policy modules that wish to compile and/or execute the
11       code that is being analyzed.
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13       Policies that inherit from Perl::Critic::DynamicPolicy will "fork" the
14       process each time the "violates" method is called.  The child process
15       is then free to compile the code and do other mischievous things
16       without corrupting the symbol table of the parent process.  When the
17       analysis is complete, the child serializes any Perl::Critic::Violation
18       objects that were created and sends them back to the parent across a
19       pipe.
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21       Any Policy that inherits from Perl::Critic::DynamicPolicy will also be
22       marked as "unsafe" and is usually ignored by both Perl::Critic and
23       perlcritic.  To use a Policy that inherits from
24       Perl::Critic::DynamicPolicy, you must set the "-allow-unsafe" switch in
25       the Perl::Critic constructor or on the perlcritic command line.
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27       In every other way, a Perl::Critic::DynamicPolicy behaves just like an
28       ordinary Perl::Critic::Policy.  For Policy authors, the main difference
29       is that you must override the "violates_dynamic" method instead of the
30       "violates" method.  See Perl::Critic::DEVELOPER for a discussion of the
31       other aspects of creating new Policies.
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METHODS

34       This list of methods is not exhaustive.  It only covers the methods
35       that are uniquely relevant to Perl::Critic::DynamicPolicy subclasses.
36       See Perl::Critic::Policy and Perl::Critic::DEVELOPER for documentation
37       about the other methods shared by all Policies.
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39       " violates( $doc, $elem ) "
40           In a typical Perl::Critic::Policy subclass, you would override the
41           "violates" method to do whatever code analysis you want.  But with
42           Perl::Critic::DynamicPolicy, this method has already been
43           overridden to perform the necessary pipe and fork operations that I
44           described above.  So instead, you need to override the
45           "violates_dyanmic" method.
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47       " violates_dynamic( $doc, $elem ) "
48           Given a PPI::Element and a PPI::Document, returns one or more
49           Perl::Critic::Violation objects if the $elem or <$doc> violates
50           this Policy.  If there are no violations, then it returns an empty
51           list.  This method will be called in a child process, so you can
52           compile $doc without interfering with the parent process.
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54           "violates_dynamic" is an abstract method and it will abort if you
55           attempt to invoke it directly.  It is the heart of your
56           Perl::Critic::DynamicPolicy modules, and your subclass must
57           override this method.
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59       " is_safe() "
60           Returns false.  Any Policy derived from this module is presumed to
61           be unsafe.  Perl::Critic and perlcritic users can only load
62           Policies derived from this module if they use the "-allow-unsafe"
63           switch.
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AUTHOR

66       Jeffrey Ryan Thalhammer <thaljef@cpan.org>
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69       Copyright (c) 2007 Jeffrey Ryan Thalhammer.  All rights reserved.
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71       This program is free software; you can redistribute it and/or modify it
72       under the same terms as Perl itself.  The full text of this license can
73       be found in the LICENSE file included with this module.
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77perl v5.34.0                      2022-01-21    Perl::Critic::DynamicPolicy(3)
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