* ext/psych/lib/psych/scalar_scanner.rb: Cache symbols while

tokenizing.  Thanks Kevin Menard!

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37291 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Oct 23 06:17:36 2012  Aaron Patterson <aaron@tenderlovemaking.com>
+
+	* ext/psych/lib/psych/scalar_scanner.rb: Cache symbols while
+	  tokenizing.  Thanks Kevin Menard!
+
 Tue Oct 23 06:15:40 2012  Aaron Patterson <aaron@tenderlovemaking.com>
 
 	* ext/psych/lib/psych/scalar_scanner.rb: Updated the RegExp to catch

ext/psych/lib/psych/scalar_scanner.rb

@@ -16,12 +16,14 @@ module Psych
     # Create a new scanner
     def initialize
       @string_cache = {}
+      @symbol_cache = {}
     end
 
     # Tokenize +string+ returning the ruby object
     def tokenize string
       return nil if string.empty?
       return string if @string_cache.key?(string)
+      return @symbol_cache[string] if @symbol_cache.key?(string)
 
       case string
       # Check for a String type, being careful not to get caught by hash keys, hex values, and
@@ -67,9 +69,9 @@ module Psych
         0.0 / 0.0
       when /^:./
         if string =~ /^:(["'])(.*)\1/
-          $2.sub(/^:/, '').to_sym
+          @symbol_cache[string] = $2.sub(/^:/, '').to_sym
         else
-          string.sub(/^:/, '').to_sym
+          @symbol_cache[string] = string.sub(/^:/, '').to_sym
         end
       when /^[-+]?[0-9][0-9_]*(:[0-5]?[0-9])+$/
         i = 0