Class: RuboCop::Cop::Layout::TrailingBlankLines

Inherits:
Cop
  • Object
show all
Includes:
ConfigurableEnforcedStyle, RangeHelp
Defined in:
lib/rubocop/cop/layout/trailing_blank_lines.rb

Overview

This cop looks for trailing blank lines and a final newline in the source code.

Examples:

EnforcedStyle: final_blank_line

# `final_blank_line` looks for one blank line followed by a new line
# at the end of files.

# bad
class Foo; end
# EOF

# bad
class Foo; end # EOF

# good
class Foo; end

# EOF

EnforcedStyle: final_newline (default)

# `final_newline` looks for one newline at the end of files.

# bad
class Foo; end

# EOF

# bad
class Foo; end # EOF

# good
class Foo; end
# EOF

Constant Summary

Constants included from Util

Util::LITERAL_REGEX

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offenses, #processed_source

Instance Method Summary collapse

Methods included from ConfigurableEnforcedStyle

#alternative_style, #alternative_styles, #ambiguous_style_detected, #correct_style_detected, #detected_style, #detected_style=, #no_acceptable_style!, #no_acceptable_style?, #opposite_style_detected, #style, #style_detected, #style_parameter_name, #supported_styles, #unexpected_style_detected

Methods inherited from Cop

#add_offense, all, autocorrect_incompatible_with, badge, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, #cop_name, cop_name, #correct, department, #disable_uncorrectable, #duplicate_location?, #excluded_file?, #find_location, #highlights, inherited, #initialize, #join_force?, lint?, match?, #messages, #parse, qualified_cop_name, #reason_to_not_correct, #relevant_file?, #target_rails_version, #target_ruby_version

Methods included from AST::Sexp

#s

Methods included from NodePattern::Macros

#def_node_matcher, #def_node_search, #node_search, #node_search_all, #node_search_body, #node_search_first

Methods included from AutocorrectLogic

#autocorrect?, #autocorrect_enabled?, #autocorrect_requested?, #correctable?, #disable_offense, #disable_uncorrectable?, #support_autocorrect?

Methods included from IgnoredNode

#ignore_node, #ignored_node?, #part_of_ignored_node?

Methods included from Util

begins_its_line?, comment_line?, double_quotes_required?, escape_string, first_part_of_call_chain, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, tokens, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, chdir, hidden_dir?, hidden_file_in_not_hidden_dir?, match_path?, pwd, relative_path, reset_pwd, smart_path

Constructor Details

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

Instance Method Details

#autocorrect(range) ⇒ Object 



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# File 'lib/rubocop/cop/layout/trailing_blank_lines.rb', line 64

def autocorrect(range)
  lambda do |corrector|
    corrector.replace(range, style == :final_newline ? "\n" : "\n\n")
  end
end

#investigate(processed_source) ⇒ Object 



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# File 'lib/rubocop/cop/layout/trailing_blank_lines.rb', line 44

def investigate(processed_source)
  buffer = processed_source.buffer
  return if buffer.source.empty?

  # The extra text that comes after the last token could be __END__
  # followed by some data to read. If so, we don't check it because
  # there could be good reasons why it needs to end with a certain
  # number of newlines.
  return if ends_in_end?(processed_source)

  whitespace_at_end = buffer.source[/\s*\Z/]
  blank_lines = whitespace_at_end.count("\n") - 1
  wanted_blank_lines = style == :final_newline ? 0 : 1

  return unless blank_lines != wanted_blank_lines

  offense_detected(buffer, wanted_blank_lines, blank_lines,
                   whitespace_at_end)
end