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Class: RuboCop::Cop::Metrics::BlockNesting

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

Overview

Checks for excessive nesting of conditional and looping constructs.

You can configure if blocks are considered using the CountBlocks and CountModifierForms options. When both are set to false (the default) blocks and modifier forms are not counted towards the nesting level. Set them to true to include these in the nesting level calculation as well.

The maximum level of nesting allowed is configurable.

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

Class Attribute Summary

::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 Attribute Details

#count_blocks?Boolean (readonly, private)

[ GitHub ]

  
# File 'lib/rubocop/cop/metrics/block_nesting.rb', line 62

def count_blocks?
  cop_config.fetch('CountBlocks', false)
end

#count_modifier_forms?Boolean (readonly, private)

[ GitHub ]

  
# File 'lib/rubocop/cop/metrics/block_nesting.rb', line 66

def count_modifier_forms?
  cop_config.fetch('CountModifierForms', false)
end

Instance Method Details

#check_nesting_level(node, max, current_level) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/metrics/block_nesting.rb', line 28

def check_nesting_level(node, max, current_level)
  if consider_node?(node)
    current_level += 1 if count_if_block?(node)
    if current_level > max
      self.max = current_level
      unless part_of_ignored_node?(node)
        add_offense(node, message: message(max)) { ignore_node(node) }
      end
    end
  end

  node.each_child_node do |child_node|
    check_nesting_level(child_node, max, current_level)
  end
end

#consider_node?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/metrics/block_nesting.rb', line 52

def consider_node?(node)
  return true if NESTING_BLOCKS.include?(node.type)

  count_blocks? && (node.block_type? || node.numblock_type?)
end

#count_if_block?(node) ⇒ Boolean (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/metrics/block_nesting.rb', line 44

def count_if_block?(node)
  return true unless node.if_type?
  return false if node.elsif?
  return count_modifier_forms? if node.modifier_form?

  true
end

#message(max) (private)

[ GitHub ]

  
# File 'lib/rubocop/cop/metrics/block_nesting.rb', line 58

def message(max)
  "Avoid more than #{max} levels of block nesting."
end

#on_new_investigation

[ GitHub ]

  
# File 'lib/rubocop/cop/metrics/block_nesting.rb', line 19

def on_new_investigation
  return if processed_source.blank?

  max = cop_config['Max']
  check_nesting_level(processed_source.ast, max, 0)
end