discourse/lib/quote_comparer.rb

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class QuoteComparer
def self.whitespace
" \t\r\n".freeze
end
def initialize(topic_id, post_number, text)
@topic_id = topic_id
@post_number = post_number
@text = text
@parent_post = Post.where(topic_id: @topic_id, post_number: @post_number).first
end
# This algorithm is far from perfect, but it follows the Discourse
# philosophy of "catch the obvious cases, leave moderation for the
# complicated ones"
def modified?
return true if @text.blank? || @parent_post.blank?
parent_text = Nokogiri::HTML::fragment(@parent_post.cooked).text.delete(QuoteComparer.whitespace)
text = @text.delete(QuoteComparer.whitespace)
!parent_text.include?(text)
end
end