Class: Henitai::Mutant::Activator

Inherits:
Object
  • Object
show all
Includes:
ConstantRedefinitionFilter
Defined in:
lib/henitai/mutant/activator.rb

Overview

Activates a mutant inside the forked child process. rubocop:disable Metrics/ClassLength

Defined Under Namespace

Modules: ConstantRedefinitionFilter

Constant Summary collapse

SERIALIZER_METHODS = 
{
  arg: :argument_parameter_fragment,
  optarg: :optional_parameter_fragment,
  restarg: :rest_parameter_fragment,
  kwarg: :keyword_parameter_fragment,
  kwoptarg: :optional_keyword_parameter_fragment,
  kwrestarg: :keyword_rest_parameter_fragment,
  blockarg: :block_parameter_fragment,
  forward_arg: :forward_parameter_fragment
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ConstantRedefinitionFilter

#warn

Class Method Details

.activate!(mutant) ⇒ Object 



38
39
40
 
# File 'lib/henitai/mutant/activator.rb', line 38

def self.activate!(mutant)
  new.activate!(mutant)
end

.activation_source_for(mutant) ⇒ Object

Returns the define_method source string for mutant without actually evaluating it. Used to pre-compute activation recipes. Returns nil if the source cannot be computed (e.g. unsupported AST node).



45
46
47
48
49
 
# File 'lib/henitai/mutant/activator.rb', line 45

def self.activation_source_for(mutant)
  new.send(:method_source, mutant)
rescue StandardError
  nil
end

Instance Method Details

#activate!(mutant) ⇒ Object 



51
52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/henitai/mutant/activator.rb', line 51

def activate!(mutant)
  subject = mutant.subject
  raise ArgumentError, "Cannot activate wildcard subjects" if subject.method_name.nil?

  source = mutant.precomputed_activation_source || method_source(mutant)
  target = target_for(subject)
  Henitai::WarningSilencer.silence do
    target.class_eval(source, __FILE__, __LINE__ + 1)
    nil
  end
rescue Unparser::UnsupportedNodeError, SyntaxError
  :compile_error
end