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Size: 801 Bytes
Versions: 33
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Stored size: 801 Bytes
Contents
module RailsGuides
module Levenshtein
# This code is based directly on the Text gem implementation
# Returns a value representing the "cost" of transforming str1 into str2
def self.distance str1, str2
s = str1
t = str2
n = s.length
m = t.length
return m if (0 == n)
return n if (0 == m)
d = (0..m).to_a
x = nil
str1.each_char.each_with_index do |char1,i|
e = i+1
str2.each_char.each_with_index do |char2,j|
cost = (char1 == char2) ? 0 : 1
x = [
d[j+1] + 1, # insertion
e + 1, # deletion
d[j] + cost # substitution
].min
d[j] = e
e = x
end
d[m] = x
end
return x
end
end
end
Version data entries
33 entries across 33 versions & 6 rubygems