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Class: RuboCop::Cop::Performance::FixedSize

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Base
Instance Chain:
self, Base
Inherits: Base
  • Object
Defined in: lib/rubocop/cop/performance/fixed_size.rb

Overview

Do not compute the size of statically sized objects.

Examples:

# String methods
# bad
'foo'.size
%q[bar].count
%(qux).length

# Symbol methods
# bad
:fred.size
:'baz'.length

# Array methods
# bad
[1, 2, thud].count
%W(1, 2, bar).size

# Hash methods
# bad
{ a: corge, b: grault }.length

# good
foo.size
bar.count
qux.length

# good
:"#{fred}".size
CONST = :baz.length

# good
[1, 2, *thud].count
garply = [1, 2, 3]
garply.size

# good
{ a: corge, **grault }.length
waldo = { a: corge, b: grault }
waldo.size

Constant Summary

Instance Method Summary

Instance Method Details

#allowed_argument?(arg) ⇒ Boolean (private)

[ GitHub ] 

  


# File 'lib/rubocop/cop/performance/fixed_size.rb', line 73



def allowed_argument?(arg)
  arg && non_string_argument?(arg.first)
end


  








  

    #allowed_parent?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/performance/fixed_size.rb', line 77



def allowed_parent?(node)
  node && (node.casgn_type? || node.block_type?)
end


  








  

    #allowed_variable?(var)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/performance/fixed_size.rb', line 69



def allowed_variable?(var)
  contains_splat?(var) || contains_double_splat?(var)
end


  








  

    #contains_double_splat?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/performance/fixed_size.rb', line 87



def contains_double_splat?(node)
  return false unless node.hash_type?

  node.each_child_node(:kwsplat).any?
end


  








  

    #contains_splat?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/performance/fixed_size.rb', line 81



def contains_splat?(node)
  return false unless node.array_type?

  node.each_child_node(:splat).any?
end


  








  

    #non_string_argument?(node)  ⇒ Boolean  (private)
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/performance/fixed_size.rb', line 93



def non_string_argument?(node)
  node && !node.str_type?
end


  








  

    #on_csend(node)  
  



  

    


Alias for #on_send.



  



  [ GitHub ]


  

  


# File 'lib/rubocop/cop/performance/fixed_size.rb', line 65



alias on_csend on_send


  








  

    #on_send(node)  
    Also known as: #on_csend
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/performance/fixed_size.rb', line 56



def on_send(node)
  return if node.ancestors.any? { |ancestor| allowed_parent?(ancestor) }

  counter(node) do |var, arg|
    return if allowed_variable?(var) || allowed_argument?(arg)

    add_offense(node)
  end
end