Class: RuboCop::Cop::Style::TernaryParentheses

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Includes:
ConfigurableEnforcedStyle, RuboCop::Cop::SafeAssignment, RuboCop::Cop::SurroundingSpace
Defined in:
lib/rubocop/cop/style/ternary_parentheses.rb

Overview

This cop checks for the presence of parentheses around ternary conditions. It is configurable to enforce inclusion or omission of parentheses using ‘EnforcedStyle`. Omission is only enforced when removing the parentheses won’t cause a different behavior.

‘AllowSafeAssignment` option for safe assignment. By safe assignment we mean putting parentheses around an assignment to indicate “I know I’m using an assignment as a condition. It’s not a mistake.”

Examples:

EnforcedStyle: require_no_parentheses (default)

# bad
foo = (bar?) ? a : b
foo = (bar.baz?) ? a : b
foo = (bar && baz) ? a : b

# good
foo = bar? ? a : b
foo = bar.baz? ? a : b
foo = bar && baz ? a : b

EnforcedStyle: require_parentheses

# bad
foo = bar? ? a : b
foo = bar.baz? ? a : b
foo = bar && baz ? a : b

# good
foo = (bar?) ? a : b
foo = (bar.baz?) ? a : b
foo = (bar && baz) ? a : b

EnforcedStyle: require_parentheses_when_complex

# bad
foo = (bar?) ? a : b
foo = (bar.baz?) ? a : b
foo = bar && baz ? a : b

# good
foo = bar? ? a : b
foo = bar.baz? ? a : b
foo = (bar && baz) ? a : b

AllowSafeAssignment: true (default)

# good
foo = (bar = baz) ? a : b

AllowSafeAssignment: false

# bad
foo = (bar = baz) ? a : b

Constant Summary collapse

VARIABLE_TYPES = 
AST::Node::VARIABLES
NON_COMPLEX_TYPES = 
[*VARIABLE_TYPES, :const, :defined?, :yield].freeze
MSG = 
'%<command>s parentheses for ternary conditions.'
MSG_COMPLEX = 
'%<command>s parentheses for ternary expressions with' \
' complex conditions.'

Constants included from RuboCop::Cop::SurroundingSpace

RuboCop::Cop::SurroundingSpace::NO_SPACE_COMMAND, RuboCop::Cop::SurroundingSpace::SINGLE_SPACE_REGEXP, RuboCop::Cop::SurroundingSpace::SPACE_COMMAND

Constants inherited from Base

Base::RESTRICT_ON_SEND

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods included from ConfigurableEnforcedStyle

#alternative_style, #alternative_styles, #ambiguous_style_detected, #correct_style_detected, #detected_style, #detected_style=, #no_acceptable_style!, #no_acceptable_style?, #opposite_style_detected, #style, #style_configured?, #style_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected

Methods inherited from Base

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, callbacks_needed, #callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, joining_forces, lint?, match?, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #correctable?, #disable_uncorrectable?, #safe_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

add_parentheses, args_begin, args_end, begins_its_line?, comment_line?, comment_lines?, double_quotes_required?, escape_string, first_part_of_call_chain, indent, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, hidden_dir?, hidden_file?, hidden_file_in_not_hidden_dir?, match_path?, maybe_hidden_file?, relative_path, smart_path

Constructor Details

This class inherits a constructor from RuboCop::Cop::Base

Instance Method Details

#on_if(node) ⇒ Object 



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# File 'lib/rubocop/cop/style/ternary_parentheses.rb', line 70

def on_if(node)
  return if only_closing_parenthesis_is_last_line?(node.condition)
  return unless node.ternary? && !infinite_loop? && offense?(node)

  message = message(node)

  add_offense(node.source_range, message: message) do |corrector|
    autocorrect(corrector, node)
  end
end

#only_closing_parenthesis_is_last_line?(condition) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rubocop/cop/style/ternary_parentheses.rb', line 81

def only_closing_parenthesis_is_last_line?(condition)
  condition.source.split("\n").last == ')'
end