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Class: RuboCop::Cop::Lint::MixedCaseRange

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:
self, ::RuboCop::Cop::RangeHelp, ::RuboCop::Cop::Base, ::RuboCop::Cop::AutocorrectLogic, ::RuboCop::Cop::IgnoredNode, ::RuboCop::Util, RuboCop::AST::Sexp
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/lint/mixed_case_range.rb

Overview

Checks for mixed-case character ranges since they include likely unintended characters.

Offenses are registered for regexp character classes like /[A-z]/ as well as range objects like ('A'..'z').

Note
 Range objects cannot be autocorrected.

Examples:

# bad
r = /[A-z]/

# good
r = /[A-Za-z]/

Cop Safety Information:

  • The cop autocorrects regexp character classes by replacing one character range with two: A-z becomes A-Za-z. In most cases this is probably what was originally intended but it changes the regexp to no longer match symbols it used to include. For this reason, this cop’s autocorrect is unsafe (it will change the behavior of the code).

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

::RuboCop::Cop::RangeHelp - Included

BYTE_ORDER_MARK, NOT_GIVEN

Class Attribute Summary

::RuboCop::Cop::AutoCorrector - Extended

support_autocorrect?

::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 a 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

::RuboCop::Cop::Base - Inherited

#active_support_extensions_enabled?, #always_autocorrect?, #config, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #processed_source, #string_literals_frozen_by_default?, #target_satisfies_all_gem_version_requirements?

::RuboCop::Cop::AutocorrectLogic - Included

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

Instance Method Summary

::RuboCop::Cop::RangeHelp - Included

#add_range,
#arguments_range

A range containing the first to the last argument of a method call or method definition.
#column_offset_between,
#contents_range

A range containing only the contents of a literal with delimiters (e.g.
#directions,
#effective_column

Returns the column attribute of the range, except if the range is on the first line and there’s a byte order mark at the beginning of that line, in which case 1 is subtracted from the column value.
#final_pos, #move_pos, #move_pos_str, #range_between, #range_by_whole_lines, #range_with_comments, #range_with_comments_and_lines, #range_with_surrounding_comma, #range_with_surrounding_space, #source_range

::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_gem_version

Returns a gems locked versions (i.e.
#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

#disable_offense, #disable_offense_at_end_of_line, #disable_offense_before_and_after, #disable_offense_with_eol_or_surround_comment, #eol_comment, #eol_comment_would_be_inside_literal?, #heredoc_range, #line_with_eol_comment_too_long?, #max_line_length, #multiline_ranges, #multiline_string?,
#range_by_lines

Expand the given range to include all of any lines it covers.
#range_of_first_line, #string_continuation?, #surrounding_heredoc?, #surrounding_percent_array?

::RuboCop::Cop::IgnoredNode - Included

#ignore_node, #ignored_node?, #part_of_ignored_node?, #ignored_nodes

Constructor Details

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

Instance Method Details

#build_source_range(range_start, range_end) (private)

[ GitHub ] 

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 71



def build_source_range(range_start, range_end)
  range_between(range_start.expression.begin_pos, range_end.expression.end_pos)
end


  








  

    #each_unsafe_regexp_range(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 55



def each_unsafe_regexp_range(node)
  node.parsed_tree&.each_expression do |expr|
    next if skip_expression?(expr)

    range_pairs(expr).reject do |range_start, range_end|
      next if skip_range?(range_start, range_end)

      next unless unsafe_range?(range_start.text, range_end.text)

      yield(build_source_range(range_start, range_end))
    end
  end
end


  








  

    #on_erange(node)  
  



  

    


Alias for #on_irange.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 43



alias on_erange on_irange


  








  

    #on_irange(node)  
    Also known as: #on_erange
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 37



def on_irange(node)
  return unless node.children.compact.all?(&:str_type?)
  return if node.begin.nil? || node.end.nil?

  add_offense(node) if unsafe_range?(node.begin.value, node.end.value)
end


  








  

    #on_regexp(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 45



def on_regexp(node)
  each_unsafe_regexp_range(node) do |loc|
    next unless (replacement = regexp_range(loc.source))

    add_offense(loc) do |corrector|
      corrector.replace(loc, replacement)
    end
  end
end


  








  

    #range_for(char)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 75



def range_for(char)
  RANGES.detect do |range|
    range.include?(char)
  end
end


  








  

    #range_pairs(expr)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 81



def range_pairs(expr)
  expr.expressions.filter_map { |e| [e.expressions[0], e.expressions[1]] if e.type == :set }
end


  








  

    #regexp_range(source)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 101



def regexp_range(source)
  open, close = source.split('-')
  return unless (open_range = range_for(open))
  return unless (close_range = range_for(close))

  first = [open, open_range.end]
  second = [close_range.begin, close]
  "#{first.uniq.join('-')}#{second.uniq.join('-')}"
end


  








  

    #skip_expression?(expr)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 91



def skip_expression?(expr)
  !(expr.type == :set && expr.token == :character)
end


  








  

    #skip_range?(range_start, range_end)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 95



def skip_range?(range_start, range_end)
  [range_start, range_end].any? do |bound|
    bound&.type != :literal
  end
end


  








  

    #unsafe_range?(range_start, range_end)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/lint/mixed_case_range.rb', line 85



def unsafe_range?(range_start, range_end)
  return false if range_start.length != 1 || range_end.length != 1

  range_for(range_start) != range_for(range_end)
end