Class: Contrast::Agent::Assess::Policy::Propagator::Reverse

Inherits:
Base
  • Object
show all
Defined in:
lib/contrast/agent/assess/policy/propagator/reverse.rb

Overview

Propagation that results in all the tags of the source being applied to the target in reverse of how they are in the source. The target’s preexisting tags are unaffected beyond any merging of overlapping tags.

Class Method Summary collapse

Methods inherited from Base

find_source, tracked_value?

Class Method Details

.propagate(propagation_node, preshift, target) ⇒ Object

propagation action required by this method.

Parameters:

Returns:

  • (Object) —

    the target with the tags applied



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# File 'lib/contrast/agent/assess/policy/propagator/reverse.rb', line 20

def propagate propagation_node, preshift, target
  return unless (properties = Contrast::Agent::Assess::Tracker.properties!(target))

  source = find_source(propagation_node.sources[0], preshift)
  properties.copy_from(source, target, 0, propagation_node.untags)

  length = target.length
  properties.tag_keys.each do |key|
    tags = properties.fetch_tag(key)
    tags.each do |tag|
      new_end = length - tag.start_idx
      new_start = new_end - tag.length
      tag.repurpose(new_start, new_end)
    end
  end

  properties.cleanup_tags
end