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Class: RuboCop::AST::CaseMatchNode

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Node, NodePattern::Macros, Parser::AST::Node
Instance Chain:
self, ConditionalNode, Node, Descendence, Sexp, Parser::AST::Node
Inherits: RuboCop::AST::Node
Defined in: lib/rubocop/ast/node/case_match_node.rb

Overview

A node extension for case_match nodes. This will be used in place of a plain node when the builder constructs the AST, making its methods available to all case_match nodes within RuboCop.

Constant Summary

Node - Inherited

ASSIGNMENTS, BASIC_CONDITIONALS, BASIC_LITERALS, COMPARISON_OPERATORS, COMPOSITE_LITERALS, CONDITIONALS, EMPTY_CHILDREN, EMPTY_PROPERTIES, EQUALS_ASSIGNMENTS, FALSEY_LITERALS, GROUP_FOR_TYPE, IMMUTABLE_LITERALS, KEYWORDS, LITERALS, LITERAL_RECURSIVE_METHODS, LITERAL_RECURSIVE_TYPES, LOOP_TYPES, MUTABLE_LITERALS, OPERATOR_KEYWORDS, POST_CONDITION_LOOP_TYPES, REFERENCES, SHORTHAND_ASSIGNMENTS, SPECIAL_KEYWORDS, TRUTHY_LITERALS, VARIABLES

Class Method Summary

Node - Inherited

.new,
.def_recursive_literal_predicate

Define a recursive_? predicate method for the given node kind.

NodePattern::Macros - Extended

def_node_matcher

Define a method which applies a pattern to an AST node.
def_node_search

Define a method which recurses over the descendants of an AST node, checking whether any of them match the provided pattern.

Instance Attribute Summary

ConditionalNode - Included

#multiline_condition?

Checks whether the condition of the node is written on more than one line.
#single_line_condition?

Checks whether the condition of the node is written on a single line.

Node - Inherited

#any_block_type?, #any_def_type?, #any_match_pattern_type?, #argument?, #argument_type?, #assignment?, #basic_conditional?, #basic_literal?, #boolean_type?, #call_type?, #chained?, #complete?, #conditional?, #empty_source?, #equals_asgn?, #falsey_literal?, #guard_clause?, #immutable_literal?, #keyword?, #literal?,
#loop_keyword?
Note
loop { } is a normal method call and thus not a loop keyword.
#multiline?

Predicates.
#mutable_literal?, #numeric_type?, #operator_keyword?,
#parent

Returns the parent node, or nil if the receiver is a root node.
#parent?, #parenthesized_call?, #post_condition_loop?,
#pure?

Some expressions are evaluated for their value, some for their side effects, and some for both.
#range_type?, #reference?, #root?,
#send_type?

Most nodes are of 'send' type, so this method is defined separately to make this check as fast as possible.
#shorthand_asgn?, #single_line?, #special_keyword?, #truthy_literal?,
#value_used?

Some expressions are evaluated for their value, some for their side effects, and some for both If we know that an expression is useful only for its side effects, that means we can transform it in ways which preserve the side effects, but change the return value So, does the return value of this node matter? If we changed it to (…​; nil), might that affect anything?
#variable?, #begin_value_used?, #case_if_value_used?, #for_value_used?, #while_until_value_used?

Instance Method Summary

ConditionalNode - Included

#body

Returns the body associated with the condition.
#condition

Returns the condition of the node.

Node - Inherited

#ancestors

Returns an array of ancestor nodes.
#assignment_or_similar?

Some cops treat the shovel operator as a kind of assignment.
#class_constructor?, #class_definition?, #complete!, #const_name, #defined_module, #defined_module_name,
#each_ancestor

Calls the given block for each ancestor node from parent to root.
#first_line, #global_const?, #lambda?, #lambda_or_proc?, #last_line,
#left_sibling

Use is discouraged, this is a potentially slow method and can lead to even slower algorithms.
#left_siblings

Use is discouraged, this is a potentially slow method and can lead to even slower algorithms.
#line_count,
#loc?

Shortcut to safely check if a location is present.
#loc_is?

Shortcut to safely test a particular location, even if this location does not exist or is nil.
#match_guard_clause?, #module_definition?,
#node_parts

Common destructuring method.
#nonempty_line_count,
#parent_module_name

Searching the AST.
#proc?, #receiver, #recursive_basic_literal?, #recursive_literal?,
#right_sibling

Use is discouraged, this is a potentially slow method and can lead to even slower algorithms.
#right_siblings

Use is discouraged, this is a potentially slow method and can lead to even slower algorithms.
#sibling_index

Returns the index of the receiver node in its siblings.
#source
Note
 Some rare nodes may have no source, like s(:args) in foo {}.
#source_length, #source_range, #str_content, #struct_constructor?,
#type?

Determine if the node is one of several node types in a single query Allows specific single node types, as well as "grouped" types (e.g.
#updated

Override Node#updated so that AST::Processor does not try to mutate our ASTs.
#defined_module0, #new_class_or_module_block?, #parent_module_name_for_block, #parent_module_name_for_sclass, #parent_module_name_part, #visit_ancestors

Descendence - Included

#child_nodes

Returns an array of child nodes.
#descendants

Returns an array of descendant nodes.
#each_child_node

Calls the given block for each child node.
#each_descendant

Calls the given block for each descendant node with depth first order.
#each_node

Calls the given block for the receiver and each descendant node in depth-first order.

Sexp - Included

#s

Creates a Node with type type and children children.

Constructor Details

This class inherits a constructor from RuboCop::AST::Node

Instance Attribute Details

#else? ⇒ Boolean (readonly)

Checks whether this case statement has an else branch.

Returns:

  • (Boolean) —

    whether the case statement has an else branch

[ GitHub ] 

  


# File 'lib/rubocop/ast/node/case_match_node.rb', line 59



def else?
  !loc.else.nil?
end


  







Instance Method Details



  

    #branches  ⇒ Array<Node, nil> 
  



  

    


Returns an array of all the when branches in the case statement.






and the else (if any). Note that these bodies could be nil.



  





  
Returns:


    
  
  • 
    (Array<Node, nil>)
—    
    

    an array of the bodies of the in branches
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/rubocop/ast/node/case_match_node.rb', line 38



def branches
  bodies = in_pattern_branches.map(&:body)
  if else?
    # `empty-else` node sets nil because it has no body.
    else_branch.empty_else_type? ? bodies.push(nil) : bodies.push(else_branch)
  end
  bodies
end


  








  

    #each_in_pattern(&block)  
  



  

    
Deprecated. 


Use in_pattern_branches.each




  



  [ GitHub ]


  

  


# File 'lib/rubocop/ast/node/case_match_node.rb', line 19



def each_in_pattern(&block)
  return in_pattern_branches.to_enum(__method__) unless block

  in_pattern_branches.each(&block)

  self
end


  








  

    #else_branch  ⇒ Node, ... 
  



  

    


Returns the else branch of the case statement, if any.



  





  
Returns:


    
  
  • 
    (Node)
—    
    

    the else branch node of the case statement
    

    
  
    • 
  
  • 
    (EmptyElse)
—    
    

    the empty else branch node of the case statement
    

    
  
    • 
  
  • 
    (nil)
—    
    

    if the case statement does not have an else branch.
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/rubocop/ast/node/case_match_node.rb', line 52



def else_branch
  node_parts[-1]
end


  








  

    #in_pattern_branches  ⇒ Array<InPatternNode> 
  



  

    


Returns an array of all the in pattern branches in the case statement.



  





  
Returns:





  [ GitHub ]


  

  


# File 'lib/rubocop/ast/node/case_match_node.rb', line 30



def in_pattern_branches
  node_parts[1...-1]
end


  








  

    #keyword  ⇒ String 
  



  

    


Returns the keyword of the case statement as a string.



  





  
Returns:


    
  
  • 
    (String)
—    
    

    the keyword of the case statement
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/rubocop/ast/node/case_match_node.rb', line 14



def keyword
  'case'
end