Ameba::Rule::Lint::DuplicateBranch

Checks that there are no repeated bodies within if/unless, case-when, case-in and rescue constructs.

This is considered invalid:

if foo
  do_foo
  do_something_else
elsif bar
  do_foo
  do_something_else
end

And this is valid:

if foo || bar
  do_foo
  do_something_else
end

With IgnoreLiteralBranches: true, branches are not registered as offenses if they return a basic literal value (string, symbol, integer, float, true, false, or nil), or return an array, hash, regexp or range that only contains one of the above basic literal values.

With IgnoreConstantBranches: true, branches are not registered as offenses if they return a constant value.

With IgnoreDuplicateElseBranch: true, in conditionals with multiple branches, duplicate 'else' branches are not registered as offenses.

YAML configuration example:

Lint/DuplicateBranch:
  Enabled: true
  IgnoreLiteralBranches: false
  IgnoreConstantBranches: false
  IgnoreDuplicateElseBranch: false

Returns true if this rule is deprecated, false otherwise.

Returns the deprecation reason for this rule, if there is any.

Returns the documentation URL for this rule.

Ameba::Rule::Lint::Syntax.documentation_url
# => "https://crystal-ameba.org/api/master/Ameba/Rule/Lint/Syntax.html"

Returns the documentation for this rule, if there is any.

module Ameba
  # This is a test rule.
  # Does nothing.
  class Rule::MyRule < Rule::Base
    def test(source)
    end
  end
end

Ameba::Rule::MyRule.parsed_doc # => "This is a test rule.\nDoes nothing."