Class: Wikipedia::VandalismDetection::Features::EmoticonsFrequency

Inherits:
Base
  • Object
show all
Defined in:
lib/wikipedia/vandalism_detection/features/emoticons_frequency.rb

Overview

This feature computes frequency of emoticon words in the inserted text.

Instance Method Summary collapse

Methods inherited from Base

#count

Instance Method Details

#calculate(edit) ⇒ Object

Returns the percentage of emoticon words in the inserted text. Returns 0.0 if inserted clean text is of zero length.



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# File 'lib/wikipedia/vandalism_detection/features/emoticons_frequency.rb', line 13

def calculate(edit)
  super

  inserted_text = edit.inserted_text
  regex = /(^|\s)(#{WordLists::EMOTICONS.join('|')})(?=\s|$|\Z|[\.,!?]\s|[\.!?]\Z)/

  emoticons_count = inserted_text.scan(regex).flatten.reject { |c| c.size < 2 }.count
  total_count = inserted_text.split.count

  (total_count > 0) ? (emoticons_count.to_f) / (total_count.to_f) : 0.0
end