Class: RuboCop::Cop::Style::MethodCallWithArgsParentheses

Inherits:

Cop

• Object
• Cop
• RuboCop::Cop::Style::MethodCallWithArgsParentheses

Includes:

ConfigurableEnforcedStyle, IgnoredMethodPatterns, IgnoredMethods

Defined in:

lib/rubocop/cop/style/method_call_with_args_parentheses.rb

Overview

This cop enforces the presence (default) or absence of parentheses in method calls containing parameters.

In the default style (require_parentheses), macro methods are ignored. Additional methods can be added to the ‘IgnoredMethods` or `IgnoredMethodPatterns` list. These options are valid only in the default style. Macros can be included by either setting `IgnoreMacros` to false or adding specific macros to the `IncludedMacros` list.

Precedence of options is all follows:

1. ‘IgnoredMethods`

2. ‘IgnoredMethodPatterns`

3. ‘IncludedMacros`

eg. If a method is listed in both ‘IncludedMacros` and `IgnoredMethods`, then the latter takes precedence (that is, the method is ignored).

In the alternative style (omit_parentheses), there are three additional options.

1. ‘AllowParenthesesInChaining` is `false` by default. Setting it to `true` allows the presence of parentheses in the last call during method chaining.

2. ‘AllowParenthesesInMultilineCall` is `false` by default. Setting it

   to `true` allows the presence of parentheses in multi-line method
   calls.
   

3. ‘AllowParenthesesInCamelCaseMethod` is `false` by default. This

   allows the presence of parentheses when calling a method whose name
   begins with a capital letter and which has no arguments. Setting it
   to `true` allows the presence of parentheses in such a method call
   even with arguments.
   

Examples:

EnforcedStyle: require_parentheses (default)

# bad
array.delete e

# good
array.delete(e)

# good
# Operators don't need parens
foo == bar

# good
# Setter methods don't need parens
foo.bar = baz

# okay with `puts` listed in `IgnoredMethods`
puts 'test'

# okay with `^assert` listed in `IgnoredMethodPatterns`
assert_equal 'test', x

# IgnoreMacros: true (default)

# good
class Foo
  bar :baz
end

# IgnoreMacros: false

# bad
class Foo
  bar :baz
end

EnforcedStyle: omit_parentheses

# bad
array.delete(e)

# good
array.delete e

# bad
foo.enforce(strict: true)

# good
foo.enforce strict: true

# AllowParenthesesInMultilineCall: false (default)

# bad
foo.enforce(
  strict: true
)

# good
foo.enforce \
  strict: true

# AllowParenthesesInMultilineCall: true

# good
foo.enforce(
  strict: true
)

# good
foo.enforce \
  strict: true

# AllowParenthesesInChaining: false (default)

# bad
foo().bar(1)

# good
foo().bar 1

# AllowParenthesesInChaining: true

# good
foo().bar(1)

# good
foo().bar 1

# AllowParenthesesInCamelCaseMethod: false (default)

# bad
Array(1)

# good
Array 1

# AllowParenthesesInCamelCaseMethod: true

# good
Array(1)

# good
Array 1

Constant Summary

TRAILING_WHITESPACE_REGEX =

/\s+\Z/.freeze

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary

• #autocorrect(node) ⇒ Object
• #message(_node = nil) ⇒ Object
• #on_send(node) ⇒ Object (also: #on_csend, #on_super, #on_yield)

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_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected

Methods inherited from Cop

#add_offense, all, autocorrect_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, #correct, department, #disable_uncorrectable, #duplicate_location?, #excluded_file?, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #messages, #parse, qualified_cop_name, #reason_to_not_correct, #relevant_file?, #target_rails_version, #target_ruby_version

Methods included from AST::Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #correctable?, #disable_offense, #disable_uncorrectable?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, comment_line?, double_quotes_required?, escape_string, first_part_of_call_chain, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, chdir, hidden_dir?, hidden_file_in_not_hidden_dir?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#autocorrect(node) ⇒ Object

# File 'lib/rubocop/cop/style/method_call_with_args_parentheses.rb', line 167

def autocorrect(node)
  case style
  when :require_parentheses
    autocorrect_for_require_parentheses(node)
  when :omit_parentheses
    autocorrect_for_omit_parentheses(node)
  end
end

#message(_node = nil) ⇒ Object

# File 'lib/rubocop/cop/style/method_call_with_args_parentheses.rb', line 176

def message(_node = nil)
  case style
  when :require_parentheses
    'Use parentheses for method calls with arguments.'
  when :omit_parentheses
    'Omit parentheses for method calls with arguments.'
  end
end

#on_send(node) ⇒ Object Also known as: on_csend, on_super, on_yield

# File 'lib/rubocop/cop/style/method_call_with_args_parentheses.rb', line 155

def on_send(node)
  case style
  when :require_parentheses
    add_offense_for_require_parentheses(node)
  when :omit_parentheses
    add_offense_for_omit_parentheses(node)
  end
end