Kevin Ryde > Perl-Critic-Pulp > Perl::Critic::Policy::CodeLayout::ProhibitIfIfSameLine

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NAME ^

Perl::Critic::Policy::CodeLayout::ProhibitIfIfSameLine - don't put if after if on same line

DESCRIPTION ^

This policy is part of the Perl::Critic::Pulp add-on. It asks you to not to write an if statement on the same line as a preceding if.

    if ($x) {
      ...
    } if ($y) {       # bad
      ...
    }

    if ($x) {
      ...
    } elsif ($y) {    # was "elsif" intended ?
      ...
    }

The idea is that an if in the layout of an elsif may be either a mistake or will be confusing to a human reader. On that basis this policy is under the "bugs" theme and medium severity (see "POLICY THEMES" in Perl::Critic).

Unless

An unless...if is treated the same. Perl allows unless ... elsif and so the same potential confusion with an elsif layout arises.

    unless ($x) {
      ...
    } if ($y) {       # bad
      ...
    }

    unless ($x) {
      ...
    } elsif ($y) {    # maybe meant to be "elsif" like this ?
      ...
    }

Whether unless ... elsif is a good idea at all is another matter. Sometimes it suits a combination of conditions.

Statement Modifiers

This policy only applies to a statement followed by a statement. An if as a statement modifier is not affected. It's usual to put that on the same line as the statement it modifies.

    do {
      ...
    } if ($x);        # ok, statement modifier

All One Line

Two if statements written on the same line will trigger the policy.

    if(1){one;}   if(2){two;}      # bad

Perhaps there could be an exception or option when both statements are entirely on the one line, or some such, for code which is trying to be compact.

Disabling

As always if you don't care about this then you can disable ProhibitIfIfSameLine from your .perlcriticrc (see "CONFIGURATION" in Perl::Critic),

    [-CodeLayout::ProhibitIfIfSameLine]

SEE ALSO ^

Perl::Critic::Pulp, Perl::Critic

Perl::Critic::Policy::ControlStructures::ProhibitCascadingIfElse, Perl::Critic::Policy::ControlStructures::ProhibitUnlessBlocks

HOME PAGE ^

http://user42.tuxfamily.org/perl-critic-pulp/index.html

COPYRIGHT ^

Copyright 2013, 2014 Kevin Ryde

Perl-Critic-Pulp is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

Perl-Critic-Pulp is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Perl-Critic-Pulp. If not, see <http://www.gnu.org/licenses/>.

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