lib/net/imap.rb: Accept continuation requests without response text

The IMAP server of DOCOMO returns such continuation requests.
[ruby-list:50558]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59666 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/net/imap.rb

@@ -964,7 +964,7 @@ module Net
           @idle_done_cond.wait(timeout)
           @idle_done_cond = nil
           if @receiver_thread_terminating
-            raise Net::IMAP::Error, "connection closed"
+            raise @exception || Net::IMAP::Error.new("connection closed")
           end
         ensure
           unless @receiver_thread_terminating
@@ -2268,8 +2268,13 @@ module Net
 
       def continue_req
         match(T_PLUS)
-        match(T_SPACE)
-        return ContinuationRequest.new(resp_text, @str)
+        token = lookahead
+        if token.symbol == T_SPACE
+          shift_token
+          return ContinuationRequest.new(resp_text, @str)
+        else
+          return ContinuationRequest.new(ResponseText.new(nil, ""), @str)
+        end
       end
 
       def response_untagged

test/net/imap/test_imap.rb

@@ -432,7 +432,7 @@ class IMAPTest < Test::Unit::TestCase
             c.signal
           end
         end
-        assert_raise(Net::IMAP::Error) do
+        assert_raise(EOFError) do
           imap.idle do |res|
             m.synchronize do
               in_idle = true

test/net/imap/test_imap_response_parser.rb

@@ -60,7 +60,7 @@ EOF
 
   def test_flag_xlist_inbox
     parser = Net::IMAP::ResponseParser.new
-	response = parser.parse(<<EOF.gsub(/\n/, "\r\n").taint)
+    response = parser.parse(<<EOF.gsub(/\n/, "\r\n").taint)
 * XLIST (\\Inbox) "." "INBOX"
 EOF
     assert_equal [:Inbox], response.data.attr
@@ -311,4 +311,12 @@ EOF
     response = parser.parse("* 1 FETCH (FLAGS (\Seen) MODSEQ (12345) UID 5)\r\n")
     assert_equal(12345, response.data.attr["MODSEQ"])
   end
+
+  def test_continuation_request_without_response_text
+    parser = Net::IMAP::ResponseParser.new
+    response = parser.parse("+\r\n")
+    assert_instance_of(Net::IMAP::ContinuationRequest, response)
+    assert_equal(nil, response.data.code)
+    assert_equal("", response.data.text)
+  end
 end