Class: Contrast::Agent::Assess::Policy::Propagator::Trim

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

Overview

This class is specifically for String#tr(_s) propagation

Disclaimer: there may be a better way, but we’re in a ‘get it work’ state. hopefully, we’ll be in a ‘get it right’ state soon.

Class Method Summary collapse

Class Method Details

.tr_s_tagger(patcher, preshift, ret, _block) ⇒ Object 



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# File 'lib/contrast/agent/assess/policy/propagator/trim.rb', line 60

def tr_s_tagger patcher, preshift, ret, _block
  return unless ret && !ret.empty?

  properties = Contrast::Agent::Assess::Tracker.properties(ret)
  return unless properties

  source = preshift.object
  args = preshift.args
  properties.splat_from(source, ret)
  properties.build_event(
      patcher,
      ret,
      source,
      ret,
      args)
  ret
end

.tr_tagger(patcher, preshift, ret, _block) ⇒ Object 



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# File 'lib/contrast/agent/assess/policy/propagator/trim.rb', line 16

def tr_tagger patcher, preshift, ret, _block
  return ret unless ret && !ret.empty?

  properties = Contrast::Agent::Assess::Tracker.properties(ret)
  return unless properties

  source = preshift.object
  args = preshift.args
  properties.copy_from(source, ret)
  replace_string = args[1]
  source_chars = source.chars
  # if the replace string is empty, then there's a bunch of deletes. this
  # functions the same as the Removal propagation.
  if replace_string == Contrast::Utils::ObjectShare::EMPTY_STRING
    Contrast::Agent::Assess::Policy::Propagator::Remove.handle_removal(source_chars, ret)
  else
    remove_ranges = []
    ret_chars = ret.chars
    start = nil
    source_chars.each_with_index do |char, idx|
      if ret_chars[idx] == char
        next unless start

        remove_ranges << (start...idx)
        start = nil
      else
        start ||= idx
      end
    end
    # account for the last char being different
    remove_ranges << (start...source_chars.length) if start
    properties.delete_tags_at_ranges(remove_ranges, false)
  end

  properties.build_event(
      patcher,
      ret,
      source,
      ret,
      args,
      1)
  ret
end