Namespace under RailsGuides

1 files changed, 25 insertions, 23 deletions

diff --git a/railties/guides/rails_guides/levenshtein.rb b/railties/guides/rails_guides/levenshtein.rb
index 4010b61e26..f99c6e6ba8 100644
--- a/railties/guides/rails_guides/levenshtein.rb
+++ b/railties/guides/rails_guides/levenshtein.rb
@@ -1,29 +1,31 @@
-module Levenshtein
-  # Based on the pseudocode in http://en.wikipedia.org/wiki/Levenshtein_distance.
-  def self.distance(s1, s2)
-    s = s1.unpack('U*')
-    t = s2.unpack('U*')
-    m = s.length
-    n = t.length
+module RailsGuides
+  module Levenshtein
+    # Based on the pseudocode in http://en.wikipedia.org/wiki/Levenshtein_distance.
+    def self.distance(s1, s2)
+      s = s1.unpack('U*')
+      t = s2.unpack('U*')
+      m = s.length
+      n = t.length
 
-    # matrix initialization
-    d = []
-    0.upto(m) { |i| d << [i] }
-    0.upto(n) { |j| d[0][j] = j }
+      # matrix initialization
+      d = []
+      0.upto(m) { |i| d << [i] }
+      0.upto(n) { |j| d[0][j] = j }
 
-    # distance computation
-    1.upto(m) do |i|
-      1.upto(n) do |j|
-        cost = s[i] == t[j] ? 0 : 1
-        d[i][j] = [
-          d[i-1][j] + 1,      # deletion
-          d[i][j-1] + 1,      # insertion
-          d[i-1][j-1] + cost, # substitution
-        ].min
+      # distance computation
+      1.upto(m) do |i|
+        1.upto(n) do |j|
+          cost = s[i] == t[j] ? 0 : 1
+          d[i][j] = [
+            d[i-1][j] + 1,      # deletion
+            d[i][j-1] + 1,      # insertion
+            d[i-1][j-1] + cost, # substitution
+          ].min
+        end
       end
-    end
 
-    # all done
-    return d[m][n]
+      # all done
+      return d[m][n]
+    end
   end
 end