lib/twitter_cldr/normalization/hangul.rb in twitter_cldr-2.4.3 vs lib/twitter_cldr/normalization/hangul.rb in twitter_cldr-3.0.0.beta1

@@ -7,10 +7,27 @@
   module Normalization
     module Hangul
 
       class << self
 
+        SBASE  = 0xAC00
+        LBASE  = 0x1100
+        VBASE  = 0x1161
+        TBASE  = 0x11A7
+
+        LCOUNT = 19
+        VCOUNT = 21
+        TCOUNT = 28
+
+        NCOUNT = VCOUNT * TCOUNT # 588
+        SCOUNT = LCOUNT * NCOUNT # 11172
+
+        LLIMIT = LBASE + LCOUNT  # 0x1113 = 4371
+        VLIMIT = VBASE + VCOUNT  # 0x1176 = 4470
+        TLIMIT = TBASE + TCOUNT  # 0x11C3 = 4547
+        SLIMIT = SBASE + SCOUNT  # 0xD7A4 = 55204
+
         # Special composition for Hangul syllables. Documented in Section 3.12 at
         # http://www.unicode.org/versions/Unicode6.1.0/ch03.pdf
         #
         def compose(code_points)
           l = code_points.first - LBASE
@@ -22,47 +39,41 @@
 
         # Special decomposition for Hangul syllables. Documented in Section 3.12 at http://www.unicode.org/versions/Unicode6.1.0/ch03.pdf
         # Also see http://source.icu-project.org/repos/icu/icuhtml/trunk/design/collation/ICU_collation_design.htm#Hangul_Implicit_CEs
         #
         def decompose(code_point)
-          l = code_point - SBASE
+          decomposition_cache[code_point] ||= begin
+            l = code_point - SBASE
 
-          t = l % TCOUNT
-          l /= TCOUNT
-          v = l % VCOUNT
-          l /= VCOUNT
+            t = l % TCOUNT
+            l /= TCOUNT
+            v = l % VCOUNT
+            l /= VCOUNT
 
-          result = []
+            result = []
 
-          result << LBASE + l
-          result << VBASE + v
-          result << TBASE + t if t > 0
+            result << LBASE + l
+            result << VBASE + v
+            result << TBASE + t if t > 0
 
-          result
+            result
+          end
         end
 
         def hangul_syllable?(code_point)
           (SBASE...SLIMIT).include?(code_point)
         end
 
-        SBASE  = 0xAC00
-        LBASE  = 0x1100
-        VBASE  = 0x1161
-        TBASE  = 0x11A7
+        private
 
-        LCOUNT = 19
-        VCOUNT = 21
-        TCOUNT = 28
+        def syllable_cache
+          @syllable_cache ||= {}
+        end
 
-        NCOUNT = VCOUNT * TCOUNT # 588
-        SCOUNT = LCOUNT * NCOUNT # 11172
+        def decomposition_cache
+          @decomposition_cache ||= {}
+        end
 
-        LLIMIT = LBASE + LCOUNT  # 0x1113 = 4371
-        VLIMIT = VBASE + VCOUNT  # 0x1176 = 4470
-        TLIMIT = TBASE + TCOUNT  # 0x11C3 = 4547
-        SLIMIT = SBASE + SCOUNT  # 0xD7A4 = 55204
-
       end
-
     end
   end
 end