Class: RuboCop::Cop::Lint::UnreachableCode

Inherits:
Base
  • Object
show all
Defined in:
lib/rubocop/cop/lint/unreachable_code.rb

Overview

Checks for unreachable code. The check are based on the presence of flow of control statement in non-final position in ‘begin` (implicit) blocks.

Examples:


# bad
def some_method
  return
  do_something
end

# bad
def some_method
  if cond
    return
  else
    return
  end
  do_something
end

# good
def some_method
  do_something
end

Constant Summary collapse

MSG = 
'Unreachable code detected.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods inherited from Base

#active_support_extensions_enabled?, #add_global_offense, #add_offense, #always_autocorrect?, autocorrect_incompatible_with, badge, #begin_investigation, #callbacks_needed, callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #cop_config, cop_name, #cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #inspect, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #parser_engine, #ready, #relevant_file?, requires_gem, #string_literals_frozen_by_default?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

Methods included from ExcludeLimit

#exclude_limit

Methods included from AutocorrectLogic

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

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

silence_warnings

Constructor Details

#initialize(config = nil, options = nil) ⇒ UnreachableCode

Returns a new instance of UnreachableCode.



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# File 'lib/rubocop/cop/lint/unreachable_code.rb', line 35

def initialize(config = nil, options = nil)
  super
  @redefined = []
  @instance_eval_count = 0
end

Instance Method Details

#after_block(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/unreachable_code.rb', line 47

def after_block(node)
  @instance_eval_count -= 1 if instance_eval_block?(node)
end

#on_begin(node) ⇒ Object Also known as: on_kwbegin 



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# File 'lib/rubocop/cop/lint/unreachable_code.rb', line 51

def on_begin(node)
  expressions = *node

  expressions.each_cons(2) do |expression1, expression2|
    next unless flow_expression?(expression1)

    add_offense(expression2)
  end
end

#on_block(node) ⇒ Object Also known as: on_numblock 



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# File 'lib/rubocop/cop/lint/unreachable_code.rb', line 41

def on_block(node)
  @instance_eval_count += 1 if instance_eval_block?(node)
end