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Class: RuboCop::Cop::Layout::SpaceBeforeBlockBraces

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::ConfigurableEnforcedStyle, ::RuboCop::Cop::Base, ::RuboCop::Cop::AutocorrectLogic, ::RuboCop::Cop::IgnoredNode, ::RuboCop::Util, RuboCop::AST::Sexp
Inherits: RuboCop::Cop::Base
Defined in: lib/rubocop/cop/layout/space_before_block_braces.rb

Overview

Checks that block braces have or don’t have a space before the opening brace depending on configuration.

Examples:

EnforcedStyle: space (default)

# bad
foo.map{ |a|
  a.bar.to_s
}

# good
foo.map { |a|
  a.bar.to_s
}

EnforcedStyle: no_space

# bad
foo.map { |a|
  a.bar.to_s
}

# good
foo.map{ |a|
  a.bar.to_s
}

EnforcedStyleForEmptyBraces: space (default)

# bad
7.times{}

# good
7.times {}

EnforcedStyleForEmptyBraces: no_space

# bad
7.times {}

# good
7.times{}

Constant Summary

::RuboCop::Cop::Base - Inherited

EMPTY_OFFENSES, RESTRICT_ON_SEND

::RuboCop::Cop::ConfigurableEnforcedStyle - Included

SYMBOL_TO_STRING_CACHE

::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.
.builtin?

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

Cops (other than builtin) are encouraged to implement this.
.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::ConfigurableEnforcedStyle - Included

#detected_style, #detected_style=, #no_acceptable_style?, #style_configured?

::RuboCop::Cop::Base - Inherited

#active_support_extensions_enabled?, #always_autocorrect?, #config, #config_to_allow_offenses, #config_to_allow_offenses=, #contextual_autocorrect?, #processed_source, #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::ConfigurableEnforcedStyle - Included

#alternative_style, #alternative_styles, #ambiguous_style_detected,
#conflicting_styles_detected

Alias for ConfigurableEnforcedStyle#no_acceptable_style!.
#correct_style_detected, #no_acceptable_style!, #opposite_style_detected, #style, #style_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected,
#unrecognized_style_detected

Alias for ConfigurableEnforcedStyle#no_acceptable_style!.

::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, #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, #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

Class Method Details

.autocorrect_incompatible_with

[ GitHub ] 

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 52



def self.autocorrect_incompatible_with
  [Style::SymbolProc]
end


  







Instance Method Details



  

    #autocorrect(corrector, range)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 133



def autocorrect(corrector, range)
  case range.source
  when /\s/ then corrector.remove(range)
  else           corrector.insert_before(range, ' ')
  end
end


  








  

    #block_delimiters_style   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 153



def block_delimiters_style
  config.for_cop('Style/BlockDelimiters')['EnforcedStyle']
end


  








  

    #check_empty(left_brace, space_plus_brace, used_style)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 83



def check_empty(left_brace, space_plus_brace, used_style)
  if style_for_empty_braces == used_style
    handle_different_styles_for_empty_braces(used_style)
    return
  elsif !config_to_allow_offenses.key?('Enabled')
    config_to_allow_offenses['EnforcedStyleForEmptyBraces'] = used_style.to_s
  end

  if style_for_empty_braces == :space
    range = left_brace
    msg = MISSING_MSG
  else
    range = range_between(space_plus_brace.begin_pos, left_brace.begin_pos)
    msg = DETECTED_MSG
  end
  add_offense(range, message: msg) { |corrector| autocorrect(corrector, range) }
end


  








  

    #check_non_empty(left_brace, space_plus_brace, used_style)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 109



def check_non_empty(left_brace, space_plus_brace, used_style)
  case used_style
  when style  then correct_style_detected
  when :space then space_detected(left_brace, space_plus_brace)
  else             space_missing(left_brace)
  end
end


  








  

    #conflict_with_block_delimiters?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 149



def conflict_with_block_delimiters?(node)
  block_delimiters_style == 'line_count_based' && style == :no_space && node.multiline?
end


  








  

    #empty_braces?(loc)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 157



def empty_braces?(loc)
  loc.begin.end_pos == loc.end.begin_pos
end


  








  

    #handle_different_styles_for_empty_braces(used_style)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 101



def handle_different_styles_for_empty_braces(used_style)
  if config_to_allow_offenses['EnforcedStyleForEmptyBraces'] &&
     config_to_allow_offenses['EnforcedStyleForEmptyBraces'].to_sym != used_style
    config_to_allow_offenses.clear
    config_to_allow_offenses['Enabled'] = false
  end
end


  








  

    #on_block(node)  
    Also known as: #on_numblock
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 56



def on_block(node)
  return if node.keywords?

  # Do not register an offense for multi-line braces when specifying
  # `EnforcedStyle: no_space`. It will conflict with autocorrection
  # by `EnforcedStyle: line_count_based` of `Style/BlockDelimiters` cop.
  # That means preventing autocorrection to incorrect autocorrected
  # code.
  # See: https://github.com/rubocop/rubocop/issues/7534
  return if conflict_with_block_delimiters?(node)

  left_brace = node.loc.begin
  space_plus_brace = range_with_surrounding_space(left_brace)
  used_style =
    space_plus_brace.source.start_with?('{') ? :no_space : :space

  if empty_braces?(node.loc)
    check_empty(left_brace, space_plus_brace, used_style)
  else
    check_non_empty(left_brace, space_plus_brace, used_style)
  end
end


  








  

    #on_numblock(node)  
  



  

    


Alias for #on_block.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 79



alias on_numblock on_block


  








  

    #space_detected(left_brace, space_plus_brace)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 124



def space_detected(left_brace, space_plus_brace)
  space = range_between(space_plus_brace.begin_pos, left_brace.begin_pos)

  add_offense(space, message: DETECTED_MSG) do |corrector|
    autocorrect(corrector, space)
    opposite_style_detected
  end
end


  








  

    #space_missing(left_brace)   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 117



def space_missing(left_brace)
  add_offense(left_brace, message: MISSING_MSG) do |corrector|
    autocorrect(corrector, left_brace)
    opposite_style_detected
  end
end


  








  

    #style_for_empty_braces   (private)
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/layout/space_before_block_braces.rb', line 140



def style_for_empty_braces
  case cop_config['EnforcedStyleForEmptyBraces']
  when 'space'    then :space
  when 'no_space' then :no_space
  when nil then style
  else raise 'Unknown EnforcedStyleForEmptyBraces selected!'
  end
end