Class: Evilution::Mutator::Operator::LastExpressionRemoval Private

Inherits:
Base
  • Object
show all
Defined in:
lib/evilution/mutator/operator/last_expression_removal.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Removes a trailing literal expression (true/false/nil/integer/symbol) from a method body. Targets the idiomatic Ruby pattern def foo?; side_effect; true; end where the explicit literal return value is the high-signal behavior under test — dropping it makes the method return whatever the preceding statement evaluates to. Strong against predicates and command-query split methods.

Constant Summary collapse

LITERAL_NODE_TYPES =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future. 

[
  Prism::TrueNode,
  Prism::FalseNode,
  Prism::NilNode,
  Prism::IntegerNode,
  Prism::SymbolNode
].freeze

Instance Attribute Summary

Attributes inherited from Base

#mutations

Instance Method Summary collapse

Methods inherited from Base

#call, clear_parse_cache!, #initialize, operator_name, parsed_tree_for

Constructor Details

This class inherits a constructor from Evilution::Mutator::Base

Instance Method Details

#visit_def_node(node) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/evilution/mutator/operator/last_expression_removal.rb', line 20

def visit_def_node(node)
  last_literal = trailing_literal(node)
  if last_literal
    add_mutation(
      offset: last_literal.location.start_offset,
      length: last_literal.location.length,
      replacement: "",
      node: last_literal
    )
  end

  super
end