Class: RuboCop::Cop::Style::Semicolon

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Includes:
RangeHelp
Defined in:
lib/rubocop/cop/style/semicolon.rb

Overview

This cop checks for multiple expressions placed on the same line. It also checks for lines terminated with a semicolon.

This cop has ‘AllowAsExpressionSeparator` configuration option. It allows `;` to separate several expressions on the same line.

Examples:

# bad
foo = 1; bar = 2;
baz = 3;

# good
foo = 1
bar = 2
baz = 3

AllowAsExpressionSeparator: false (default)

# bad
foo = 1; bar = 2

AllowAsExpressionSeparator: true

# good
foo = 1; bar = 2

Constant Summary collapse

MSG = 
'Do not use semicolons to terminate expressions.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Instance Attribute Summary

Attributes inherited from Base

#config, #processed_source

Instance Method Summary collapse

Methods included from AutoCorrector

support_autocorrect?

Methods inherited from Base

#add_global_offense, #add_offense, autocorrect_incompatible_with, badge, callbacks_needed, #callbacks_needed, #config_to_allow_offenses, #config_to_allow_offenses=, #cop_config, cop_name, #cop_name, department, documentation_url, exclude_from_registry, #excluded_file?, #external_dependency_checksum, inherited, #initialize, joining_forces, lint?, match?, #message, #offenses, #on_investigation_end, #on_other_file, #ready, #relevant_file?, 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?, #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

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

Instance Method Details

#on_begin(node) ⇒ Object

rubocop:todo Metrics/CyclomaticComplexity



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# File 'lib/rubocop/cop/style/semicolon.rb', line 43

def on_begin(node) # rubocop:todo Metrics/CyclomaticComplexity
  return if cop_config['AllowAsExpressionSeparator']

  exprs = node.children

  return if exprs.size < 2

  # create a map matching lines to the number of expressions on them
  exprs_lines = exprs.map(&:first_line)
  lines = exprs_lines.group_by(&:itself)

  lines.each do |line, expr_on_line|
    # Every line with more than one expression on it is a
    # potential offense
    next unless expr_on_line.size > 1

    # TODO: Find the correct position of the semicolon. We don't know
    # if the first semicolon on the line is a separator of
    # expressions. It's just a guess.
    column = @processed_source[line - 1].index(';')

    next unless column

    convention_on(line, column, false)
  end
end

#on_new_investigation ⇒ Object 



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# File 'lib/rubocop/cop/style/semicolon.rb', line 35

def on_new_investigation
  return if processed_source.blank?

  @processed_source = processed_source

  check_for_line_terminator_or_opener
end