Module: Canivete::Similarity

Defined in:
lib/canivete/similarity.rb

Instance Method Summary collapse

Instance Method Details

#similarity_rate(target_string, options = {:ignore_case => true}) ⇒ Object

return the similarity rate between two strings, ranging from 0.0 to 1.0



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# File 'lib/canivete/similarity.rb', line 5

def similarity_rate(target_string, options = {:ignore_case => true})
	src = self.dup
	tgt = target_string.dup

	if options[:ignore_case]
		src.downcase!
		tgt.downcase!
	end

	return 0 if (src.length == 0 && tgt.length != 0)
	return 1 if (src.length == 0 && tgt.length == 0)
	distance = Text::Levenshtein.distance(src, tgt)
	rate = 1 - (distance/src.length.to_f) unless src.length == 0
	rate < 0.0 ? 0.0 : rate
end