Class: RuboCop::Cop::Lint::AmbiguousBlockAssociation

Inherits:
Base
  • Object
show all
Extended by:
AutoCorrector
Includes:
AllowedMethods, AllowedPattern
Defined in:
lib/rubocop/cop/lint/ambiguous_block_association.rb

Overview

Checks for ambiguous block association with method when param passed without parentheses.

This cop can customize allowed methods with ‘AllowedMethods`. By default, there are no methods to allowed.

Examples:


# bad
some_method a { |val| puts val }

# good
# With parentheses, there's no ambiguity.
some_method(a { |val| puts val })
# or (different meaning)
some_method(a) { |val| puts val }

# good
# Operator methods require no disambiguation
foo == bar { |b| b.baz }

# good
# Lambda arguments require no disambiguation
foo = ->(bar) { bar.baz }

AllowedMethods: [] (default)


# bad
expect { do_something }.to change { object.attribute }

AllowedMethods: [change]


# good
expect { do_something }.to change { object.attribute }

AllowedPatterns: [] (default)


# bad
expect { do_something }.to change { object.attribute }

AllowedPatterns: [‘change’]


# good
expect { do_something }.to change { object.attribute }
expect { do_something }.to not_change { object.attribute }

Constant Summary collapse

MSG = 
'Parenthesize the param `%<param>s` to make sure that the ' \
'block will be associated with the `%<method>s` method ' \
'call.'

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

#active_support_extensions_enabled?, #add_global_offense, #add_offense, autocorrect_incompatible_with, badge, #begin_investigation, 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, #inspect, joining_forces, lint?, match?, #offenses, #on_investigation_end, #on_new_investigation, #on_other_file, #parse, #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?, #autocorrect_with_disable_uncorrectable?, #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_send(node) ⇒ Object Also known as: on_csend 



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# File 'lib/rubocop/cop/lint/ambiguous_block_association.rb', line 64

def on_send(node)
  return unless node.arguments?

  return unless ambiguous_block_association?(node)
  return if node.parenthesized? || node.last_argument.lambda_or_proc? ||
            allowed_method_pattern?(node)

  message = message(node)

  add_offense(node, message: message) do |corrector|
    wrap_in_parentheses(corrector, node)
  end
end