Class: RuboCop::Cop::Style::HashSyntax

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

Overview

This cop checks hash literal syntax.

It can enforce either the use of the class hash rocket syntax or the use of the newer Ruby 1.9 syntax (when applicable).

A separate offense is registered for each problematic pair.

The supported styles are:

  • ruby19 - forces use of the 1.9 syntax (e.g. {a: 1}) when hashes have all symbols for keys
  • hash_rockets - forces use of hash rockets for all hashes
  • no_mixed_keys - simply checks for hashes with mixed syntaxes
  • ruby19_no_mixed_keys - forces use of ruby 1.9 syntax and forbids mixed syntax hashes

Examples:

EnforcedStyle: ruby19 (default)

# bad
{:a => 2}
{b: 1, :c => 2}

# good
{a: 2, b: 1}
{:c => 2, 'd' => 2} # acceptable since 'd' isn't a symbol
{d: 1, 'e' => 2} # technically not forbidden

EnforcedStyle: hash_rockets

# bad
{a: 1, b: 2}
{c: 1, 'd' => 5}

# good
{:a => 1, :b => 2}

EnforcedStyle: no_mixed_keys

# bad
{:a => 1, b: 2}
{c: 1, 'd' => 2}

# good
{:a => 1, :b => 2}
{c: 1, d: 2}

EnforcedStyle: ruby19_no_mixed_keys

# bad
{:a => 1, :b => 2}
{c: 2, 'd' => 3} # should just use hash rockets

# good
{a: 1, b: 2}
{:c => 3, 'd' => 4}

Constant Summary collapse

MSG_19 = 
'Use the new Ruby 1.9 hash syntax.'
MSG_NO_MIXED_KEYS = 
"Don't mix styles in the same hash."
MSG_HASH_ROCKETS = 
'Use hash rockets syntax.'

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 included from ConfigurableEnforcedStyle

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

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_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?, #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

#alternative_style ⇒ Object 


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# File 'lib/rubocop/cop/style/hash_syntax.rb', line 108

def alternative_style
  case style
  when :hash_rockets
    :ruby19
  when :ruby19, :ruby19_no_mixed_keys
    :hash_rockets
  end
end

#hash_rockets_check(pairs) ⇒ Object 


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# File 'lib/rubocop/cop/style/hash_syntax.rb', line 86

def hash_rockets_check(pairs)
  check(pairs, ':', MSG_HASH_ROCKETS)
end

#no_mixed_keys_check(pairs) ⇒ Object 


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# File 'lib/rubocop/cop/style/hash_syntax.rb', line 100

def no_mixed_keys_check(pairs)
  if sym_indices?(pairs)
    check(pairs, pairs.first.inverse_delimiter, MSG_NO_MIXED_KEYS)
  else
    check(pairs, ':', MSG_NO_MIXED_KEYS)
  end
end

#on_hash(node) ⇒ Object 


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# File 'lib/rubocop/cop/style/hash_syntax.rb', line 66

def on_hash(node)
  pairs = node.pairs

  return if pairs.empty?

  if style == :hash_rockets || force_hash_rockets?(pairs)
    hash_rockets_check(pairs)
  elsif style == :ruby19_no_mixed_keys
    ruby19_no_mixed_keys_check(pairs)
  elsif style == :no_mixed_keys
    no_mixed_keys_check(pairs)
  elsif node.source.include?('=>')
    ruby19_check(pairs)
  end
end

#ruby19_check(pairs) ⇒ Object 


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# File 'lib/rubocop/cop/style/hash_syntax.rb', line 82

def ruby19_check(pairs)
  check(pairs, '=>', MSG_19) if sym_indices?(pairs)
end

#ruby19_no_mixed_keys_check(pairs) ⇒ Object 


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# File 'lib/rubocop/cop/style/hash_syntax.rb', line 90

def ruby19_no_mixed_keys_check(pairs)
  if force_hash_rockets?(pairs)
    check(pairs, ':', MSG_HASH_ROCKETS)
  elsif sym_indices?(pairs)
    check(pairs, '=>', MSG_19)
  else
    check(pairs, ':', MSG_NO_MIXED_KEYS)
  end
end