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Class: RuboCop::Cop::Style::FileRead

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/style/file_read.rb

Overview

Favor File.(bin)read convenience methods.

Examples:

# bad - text mode
File.open(filename).read
File.open(filename, &:read)
File.open(filename) { |f| f.read }
File.open(filename) do |f|
  f.read
end
File.open(filename, 'r').read
File.open(filename, 'r', &:read)
File.open(filename, 'r') do |f|
  f.read
end

# good
File.read(filename)

# bad - binary mode
File.open(filename, 'rb').read
File.open(filename, 'rb', &:read)
File.open(filename, 'rb') do |f|
  f.read
end

# good
File.binread(filename)

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, #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_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, #max_line_length,
#range_by_lines

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

#block_read?(node)

[ GitHub ] 

  


# File 'lib/rubocop/cop/style/file_read.rb', line 62



def_node_matcher :block_read?, <<~PATTERN
  (block _ (args (arg _name)) (send (lvar _name) :read))
PATTERN


  








  

    #evidence(node)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/file_read.rb', line 81



def evidence(node)
  file_open?(node) do |filename, mode_array, block_pass|
    read_node?(node, block_pass) do |read_node|
      yield(filename, mode_array.first || 'r', read_node)
    end
  end
end


  








  

    #file_open?(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/file_read.rb', line 46



def_node_matcher :file_open?, <<~PATTERN
  (send
    (const {nil? cbase} :File)
    :open
    $_
    (str $%READ_FILE_START_TO_FINISH_MODES)?
    $(block-pass (sym :read))?
  )
PATTERN


  








  

    #file_open_read?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/file_read.rb', line 97



def file_open_read?(node)
  return true if send_read?(node)

  block_read?(node)
end


  








  

    #on_send(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/file_read.rb', line 66



def on_send(node)
  evidence(node) do |filename, mode, read_node|
    message = format(MSG, read_method: read_method(mode))

    add_offense(read_node, message: message) do |corrector|
      range = range_between(node.loc.selector.begin_pos, read_node.source_range.end_pos)
      replacement = "#{read_method(mode)}(#{filename.source})"

      corrector.replace(range, replacement)
    end
  end
end


  








  

    #read_method(mode)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/file_read.rb', line 103



def read_method(mode)
  mode.end_with?('b') ? :binread : :read
end


  








  

    #read_node?(node, block_pass)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/file_read.rb', line 89



def read_node?(node, block_pass)
  if block_pass.any?
    yield(node)
  elsif file_open_read?(node.parent)
    yield(node.parent)
  end
end


  








  

    #send_read?(node)  
  

  [ GitHub ]


  

  


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



def_node_matcher :send_read?, <<~PATTERN
  (send _ :read)
PATTERN