Make tokenizer syntax ignorant

elm-city-craftworks · Jan 25, 2012 · fd9a25e · fd9a25e
1 parent 34281de
commit fd9a25e
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Showing 2 changed files with 8 additions and 5 deletions.
diff --git a/lib/turing_tarpit/scanner.rb b/lib/turing_tarpit/scanner.rb
@@ -1,5 +1,8 @@
 module TuringTarpit
   class Scanner
+    FORWARD_JUMP  = "["
+    BACKWARD_JUMP = "]"
+
     def initialize(chars)
       self.chars = chars
       self.index = -1
@@ -21,11 +24,11 @@ def next_while(char)
     end
 
     def jump_forward
-      jump("[", "]", 1)
+      jump(FORWARD_JUMP, BACKWARD_JUMP, 1)
     end
 
     def jump_back
-      jump("]", "[", -1)
+      jump(BACKWARD_JUMP, FORWARD_JUMP, -1)
     end
 
     private 

diff --git a/lib/turing_tarpit/tokenizer.rb b/lib/turing_tarpit/tokenizer.rb
@@ -8,12 +8,12 @@ def initialize(source_text)
 
     def next(cell_value)
       case scanner.next_char
-      when "["
+      when Scanner::FORWARD_JUMP
         scanner.jump_forward if cell_value.zero?
         scanner.next_char
-      when "]"
+      when Scanner::BACKWARD_JUMP
         if cell_value.zero?
-          scanner.next_while("]") 
+          scanner.next_while(Scanner::BACKWARD_JUMP) 
         else
           scanner.jump_back
           scanner.next_char