Class: Contrast::Extension::Assess::RegexpPropagator

Inherits:
Object
  • Object
show all
Extended by:
Components::Logger::InstanceMethods, Components::Scope::InstanceMethods
Defined in:
lib/contrast/extension/assess/regexp.rb,
ext/cs__assess_regexp/cs__assess_regexp.c

Overview

This Class provides us with a way to invoke Regexp propagation for those methods which are too complex to fit into one of the standard Contrast::Agent::Assess::Policy::Propagator molds without cluttering up the Regexp Class or exposing our methods there.

Class Method Summary collapse

Methods included from Components::Logger::InstanceMethods

cef_logger, logger

Methods included from Components::Scope::InstanceMethods

contrast_enter_method_scopes!, contrast_exit_method_scopes!, with_app_scope, with_contrast_scope, with_deserialization_scope, with_split_scope

Class Method Details

.track_equal_squiggle(info_hash) ⇒ Object 



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# File 'lib/contrast/extension/assess/regexp.rb', line 37

def track_equal_squiggle info_hash
  return unless ::Contrast::ASSESS.enabled?

  # Because we have a special case for this propagation,
  # it falls out of regular scoping. As such, any patch to the `=~` method
  # that goes through normal channels, like that for the redos rule,
  # will force this to be in a scope of 1 (instead of the normal 0).
  # As such, a scope of 1 here indicates that,
  # so we know that we're in the top level call for this method.
  # normal patch [-alias-]> special case patch [-alias-]> original method
  # TODO: RUBY-686
  return if scope_for_current_ec.instance_variable_get(:@contrast_scope) > 1

  target = info_hash[:back_ref]
  with_contrast_scope do
    return unless (result = info_hash[:result])
    return unless (string = info_hash[:string])
    return unless (properties = Contrast::Agent::Assess::Tracker.properties!(target))

    properties.splat_from(string, target)
    event_data = Contrast::Agent::Assess::Events::EventData.new(REGEXP_EQUAL_SQUIGGLE_NODE,
                                                                target,
                                                                self,
                                                                result,
                                                                [string])
    properties.build_event(event_data)
  end
rescue Exception => e # rubocop:disable Lint/RescueException
  logger.error('Unable to propagate during Regexp#=~', e)
end