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.IX Title "Perl::Critic::Policy::ValuesAndExpressions::ProhibitLongChainsOfMethodCalls 3pm"
.TH Perl::Critic::Policy::ValuesAndExpressions::ProhibitLongChainsOfMethodCalls 3pm 2023-07-26 "perl v5.38.0" "User Contributed Perl Documentation"
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.SH NAME
Perl::Critic::Policy::ValuesAndExpressions::ProhibitLongChainsOfMethodCalls \- Long chains of method calls indicate tightly coupled code.
.SH AFFILIATION
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH DESCRIPTION
.IX Header "DESCRIPTION"
A long chain of method calls usually indicates that the code knows too
much about the interrelationships between objects.  If the code is
able to directly navigate far down a network of objects, then when the
network changes structure in the future, the code will need to be
modified to deal with the change.  The code is too tightly coupled and
is brittle.
.PP
.Vb 4
\&    $x = $y\->a;           #ok
\&    $x = $y\->a\->b;        #ok
\&    $x = $y\->a\->b\->c;     #questionable, but allowed by default
\&    $x = $y\->a\->b\->c\->d;  #not ok
.Ve
.SH CONFIGURATION
.IX Header "CONFIGURATION"
This policy has one option: \f(CW\*(C`max_chain_length\*(C'\fR which controls how far
the code is allowed to navigate.  The default value is 3.
.SH "TO DO"
.IX Header "TO DO"
Add a \f(CW\*(C`class_method_exemptions\*(C'\fR option to allow for things like
.PP
.Vb 6
\&    File::Find::Rule
\&        \->name(\*(Aq*.blah\*(Aq)
\&        \->not_name(\*(Aqthingy\*(Aq)
\&        \->readable()
\&        \->directory()
\&        \->in(@roots);
.Ve
.SH AUTHOR
.IX Header "AUTHOR"
Elliot Shank \f(CW\*(C`<perl@galumph.com>\*(C'\fR
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c) 2007\-2011 Elliot Shank.
.PP
This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.  The full text of this license
can be found in the LICENSE file included with this module.