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Class: RuboCop::Cop::Style::RedundantException

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::RuboCop::Cop::AutoCorrector, ::RuboCop::Cop::Base, ::RuboCop::ExcludeLimit, NodePattern::Macros, RuboCop::AST::Sexp
Instance Chain:
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/style/redundant_exception.rb

Overview

Checks for RuntimeError as the argument of raise/fail.

Examples:

# bad
raise RuntimeError, 'message'
raise RuntimeError.new('message')

# good
raise 'message'

# bad - message is not a string
raise RuntimeError, Object.new
raise RuntimeError.new(Object.new)

# good
raise Object.new.to_s

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

Class Attribute Summary

::RuboCop::Cop::AutoCorrector - Extended

::RuboCop::Cop::Base - Inherited

.gem_requirements, .lint?,
.support_autocorrect?

Returns if class supports autocorrect.

.support_multiple_source?

Override if your cop should be called repeatedly for multiple investigations Between calls to on_new_investigation and on_investigation_end, the result of processed_source will remain constant.

Class Method Summary

::RuboCop::Cop::Base - Inherited

.autocorrect_incompatible_with

List of cops that should not try to autocorrect at the same time as this cop.

.badge

Naming.

.callbacks_needed, .cop_name, .department,
.documentation_url

Returns an url to view this cops documentation online.

.exclude_from_registry

Call for abstract Cop classes.

.inherited,
.joining_forces

Override and return the Force class(es) you need to join.

.match?

Returns true if the cop name or the cop namespace matches any of the given names.

.new,
.requires_gem

Register a version requirement for the given gem name.

.restrict_on_send

::RuboCop::ExcludeLimit - Extended

exclude_limit

Sets up a configuration option to have an exclude limit tracked.

transform

Instance Attribute Summary

Instance Method Summary

::RuboCop::Cop::Base - Inherited

#add_global_offense

Adds an offense that has no particular location.

#add_offense

Adds an offense on the specified range (or node with an expression) Unless that offense is disabled for this range, a corrector will be yielded to provide the cop the opportunity to autocorrect the offense.

#begin_investigation

Called before any investigation.

#callbacks_needed,
#cop_config

Configuration Helpers.

#cop_name, #excluded_file?,
#external_dependency_checksum

This method should be overridden when a cop’s behavior depends on state that lives outside of these locations:

#inspect
#message

Gets called if no message is specified when calling add_offense or add_global_offense Cops are discouraged to override this; instead pass your message directly.

#name

Alias for Base#cop_name.

#offenses,
#on_investigation_end

Called after all on_…​

#on_new_investigation

Called before all on_…​

#on_other_file

Called instead of all on_…​

#parse

There should be very limited reasons for a Cop to do it’s own parsing.

#parser_engine,
#ready

Called between investigations.

#relevant_file?, #target_rails_version, #target_ruby_version, #annotate, #apply_correction, #attempt_correction,
#callback_argument

Reserved for Cop::Cop.

#complete_investigation

Called to complete an investigation.

#correct, #current_corrector,
#current_offense_locations

Reserved for Commissioner:

#current_offenses, #currently_disabled_lines, #custom_severity, #default_severity, #disable_uncorrectable, #enabled_line?, #file_name_matches_any?, #find_message, #find_severity, #range_for_original, #range_from_node_or_range,
#reset_investigation

Actually private methods.

#use_corrector

::RuboCop::Cop::AutocorrectLogic - Included

::RuboCop::Cop::IgnoredNode - Included

Constructor Details

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

Instance Method Details

#compact?(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_exception.rb', line 79

def_node_matcher :compact?, <<~PATTERN
  (send nil? {:raise :fail} $(send (const {nil? cbase} :RuntimeError) :new $_))
PATTERN

#exploded?(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_exception.rb', line 74

def_node_matcher :exploded?, <<~PATTERN
  (send nil? ${:raise :fail} (const {nil? cbase} :RuntimeError) $_)
PATTERN

#fix_compact(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_exception.rb', line 57

def fix_compact(node)
  compact?(node) do |new_call, message|
    add_offense(node, message: MSG_2) do |corrector|
      corrector.replace(new_call, replaced_compact(message))
    end
  end
end

#fix_exploded(node) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_exception.rb', line 39

def fix_exploded(node)
  exploded?(node) do |command, message|
    add_offense(node, message: MSG_1) do |corrector|
      corrector.replace(node, replaced_exploded(node, command, message))
    end
  end
end

#on_send(node)

Switch raise RuntimeError, 'message' to raise 'message', and raise RuntimeError.new('message') to raise 'message'.

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_exception.rb', line 33

def on_send(node)
  fix_exploded(node) || fix_compact(node)
end

#replaced_compact(message) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_exception.rb', line 65

def replaced_compact(message)
  if string_message?(message)
    message.source
  else
    "#{message.source}.to_s"
  end
end

#replaced_exploded(node, command, message) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_exception.rb', line 47

def replaced_exploded(node, command, message)
  arg = string_message?(message) ? message.source : "#{message.source}.to_s"
  arg = node.parenthesized? ? "(#{arg})" : " #{arg}"
  "#{command}#{arg}"
end

#string_message?(message) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/style/redundant_exception.rb', line 53

def string_message?(message)
  message.str_type? || message.dstr_type? || message.xstr_type?
end