* lib/racc/grammar.rb (separated_by): last commit was wrong. use opti…

…onal default return value of #option.

git-svn-id: file:///Users/aaron/Desktop/public/racc/trunk@3695 1b9489fe-b721-0410-924e-b54b9192deb8

ChangeLog

@@ -1,3 +1,8 @@
+Tue Feb 20 18:45:45 2007  Minero Aoki  <[email protected]>
+
+	* lib/racc/grammar.rb (separated_by): last commit was wrong.  use
+	  optional default return value of #option.
+
 Tue Feb 20 18:27:48 2007  Minero Aoki  <[email protected]>
 
 	* lib/racc/grammar.rb (separated_by): return [] for empty list.

lib/racc/grammar.rb

@@ -284,9 +284,9 @@ def action(&block)
 
       alias _ action
 
-      def option(sym, &block)
+      def option(sym, default = nil, &block)
         _defmetasyntax("option", _intern(sym), block) {|target|
-          seq() | seq(sym)
+          seq() { default } | seq(sym)
         }
       end
 
@@ -305,10 +305,7 @@ def many1(sym, &block)
       end
 
       def separated_by(sep, sym, &block)
-        _defmetasyntax("separated_by", _intern(sym), block) {|target|
-            seq() { [] }\
-          | seq(target, sep, sym) {|list, _, x| list.push x; list }
-        }
+        option(separated_by1(sep, sym), [], &block)
       end
 
       def separated_by1(sep, sym, &block)