* lib/irb/ruby-lex.rb, lib/irb/ruby-token.rb: support %s-notation for irb.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4322 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/irb/ruby-lex.rb

@@ -301,7 +301,8 @@ class RubyLex
     "x" => "\`",
     "r" => "\/",
     "w" => "]",
-    "W" => "]"
+    "W" => "]",
+    "s" => ":"
   }
   
   PERCENT_PAREN = {
@@ -316,7 +317,8 @@ class RubyLex
     "\"" => TkSTRING,
     "\`" => TkXSTRING,
     "\/" => TkREGEXP,
-    "]" => TkDSTRING
+    "]" => TkDSTRING,
+    ":" => TkSYMBOL
   }
   DLtype2Token = {
     "\"" => TkDSTRING,

lib/irb/ruby-token.rb

@@ -164,6 +164,7 @@ module RubyToken
     [:TkSTRING,     TkVal],
     [:TkXSTRING,    TkVal],
     [:TkREGEXP,     TkVal],
+    [:TkSYMBOL,     TkVal],
 
     [:TkDSTRING,    TkNode],
     [:TkDXSTRING,   TkNode],