Class: RuboCop::Cop::Lint::AmbiguousOperator

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Defined in:
lib/rubocop/cop/lint/ambiguous_operator.rb

Overview

This cop checks for ambiguous operators in the first argument of a method invocation without parentheses.

Examples:


# bad

# The `*` is interpreted as a splat operator but it could possibly be
# a `*` method invocation (i.e. `do_something.*(some_array)`).
do_something *some_array

# good

# With parentheses, there's no ambiguity.
do_something(*some_array)

Constant Summary collapse

AMBIGUITIES =
{
  '+'  => { actual: 'positive number', possible: 'addition' },
  '-'  => { actual: 'negative number', possible: 'subtraction' },
  '*'  => { actual: 'splat',           possible: 'multiplication' },
  '&'  => { actual: 'block',           possible: 'binary AND' },
  '**' => { actual: 'keyword splat',   possible: 'exponent' }
}.each do |key, hash|
  hash[:operator] = key
end
MSG_FORMAT =
'Ambiguous %<actual>s operator. Parenthesize the method ' \
"arguments if it's surely a %<actual>s operator, or add " \
'a whitespace to the right of the `%<operator>s` if it ' \
'should be a %<possible>s.'

Constants inherited from Base

Base::RESTRICT_ON_SEND

Constants included from Util

Util::LITERAL_REGEX

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?, #offenses, #on_investigation_end, #on_other_file, #ready, #relevant_file?, support_autocorrect?, support_multiple_source?, #target_rails_version, #target_ruby_version

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

add_parentheses, args_begin, args_end, begins_its_line?, comment_line?, comment_lines?, double_quotes_required?, escape_string, first_part_of_call_chain, indent, interpret_string_escapes, line_range, needs_escaping?, on_node, parentheses?, same_line?, to_string_literal, to_supported_styles, trim_string_interporation_escape_character

Methods included from PathUtil

absolute?, hidden_dir?, hidden_file?, hidden_file_in_not_hidden_dir?, match_path?, maybe_hidden_file?, relative_path, smart_path

Constructor Details

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

Instance Method Details

#on_new_investigationObject


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# File 'lib/rubocop/cop/lint/ambiguous_operator.rb', line 41

def on_new_investigation
  processed_source.diagnostics.each do |diagnostic|
    next unless diagnostic.reason == :ambiguous_prefix

    offense_node = find_offense_node_by(diagnostic)
    next unless offense_node

    message = message(diagnostic)

    add_offense(
      diagnostic.location, message: message, severity: diagnostic.level
    ) do |corrector|
      add_parentheses(offense_node, corrector)
    end
  end
end