update

shellphy · Jun 20, 2015 · 4d6a38b · 4d6a38b
1 parent 10523da
commit 4d6a38b
Showing 1 changed file with 8 additions and 8 deletions.
diff --git a/RE_Tree.h b/RE_Tree.h
@@ -27,14 +27,14 @@ class RE_Tree
 
 	/*
 	正则表达式的BNF
-	exp -> exp | A
-	-> e
-	A -> A + B
-	-> e
-	B -> C*
-	-> e
-	C -> ( exp )
-	-> e
+	    exp -> exp | A
+	        -> A
+	      A -> A + B
+	        -> B
+	      B -> C*
+	        -> C
+	      C -> ( exp )
+	        -> e
 	用递归下降的方式来解析正则表达式, 生成表达式树
 	下面的四个函数分别对应于BNF中的四个推导
 	*/