[ruby/net-imap] Move UTF7 & datetime formatting to net/imap/data_encoding

Partially implements #10.

https://github.com/ruby/net-imap/commit/0d43c5e856

lib/net/imap.rb

@@ -23,6 +23,7 @@ rescue LoadError
 end
 
 require_relative "imap/command_data"
+require_relative "imap/data_encoding"
 require_relative "imap/response_data"
 require_relative "imap/response_parser"
 
@@ -1054,46 +1055,6 @@ module Net
       end
     end
 
-    # Decode a string from modified UTF-7 format to UTF-8.
-    #
-    # UTF-7 is a 7-bit encoding of Unicode [UTF7].  IMAP uses a
-    # slightly modified version of this to encode mailbox names
-    # containing non-ASCII characters; see [IMAP] section 5.1.3.
-    #
-    # Net::IMAP does _not_ automatically encode and decode
-    # mailbox names to and from UTF-7.
-    def self.decode_utf7(s)
-      return s.gsub(/&([^-]+)?-/n) {
-        if $1
-          ($1.tr(",", "/") + "===").unpack1("m").encode(Encoding::UTF_8, Encoding::UTF_16BE)
-        else
-          "&"
-        end
-      }
-    end
-
-    # Encode a string from UTF-8 format to modified UTF-7.
-    def self.encode_utf7(s)
-      return s.gsub(/(&)|[^\x20-\x7e]+/) {
-        if $1
-          "&-"
-        else
-          base64 = [$&.encode(Encoding::UTF_16BE)].pack("m0")
-          "&" + base64.delete("=").tr("/", ",") + "-"
-        end
-      }.force_encoding("ASCII-8BIT")
-    end
-
-    # Formats +time+ as an IMAP-style date.
-    def self.format_date(time)
-      return time.strftime('%d-%b-%Y')
-    end
-
-    # Formats +time+ as an IMAP-style date-time.
-    def self.format_datetime(time)
-      return time.strftime('%d-%b-%Y %H:%M %z')
-    end
-
     private
 
     CRLF = "\r\n"      # :nodoc:

lib/net/imap/data_encoding.rb

@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+module Net
+  class IMAP < Protocol
+
+    # Decode a string from modified UTF-7 format to UTF-8.
+    #
+    # UTF-7 is a 7-bit encoding of Unicode [UTF7].  IMAP uses a
+    # slightly modified version of this to encode mailbox names
+    # containing non-ASCII characters; see [IMAP] section 5.1.3.
+    #
+    # Net::IMAP does _not_ automatically encode and decode
+    # mailbox names to and from UTF-7.
+    def self.decode_utf7(s)
+      return s.gsub(/&([^-]+)?-/n) {
+        if $1
+          ($1.tr(",", "/") + "===").unpack1("m").encode(Encoding::UTF_8, Encoding::UTF_16BE)
+        else
+          "&"
+        end
+      }
+    end
+
+    # Encode a string from UTF-8 format to modified UTF-7.
+    def self.encode_utf7(s)
+      return s.gsub(/(&)|[^\x20-\x7e]+/) {
+        if $1
+          "&-"
+        else
+          base64 = [$&.encode(Encoding::UTF_16BE)].pack("m0")
+          "&" + base64.delete("=").tr("/", ",") + "-"
+        end
+      }.force_encoding("ASCII-8BIT")
+    end
+
+    # Formats +time+ as an IMAP-style date.
+    def self.format_date(time)
+      return time.strftime('%d-%b-%Y')
+    end
+
+    # Formats +time+ as an IMAP-style date-time.
+    def self.format_datetime(time)
+      return time.strftime('%d-%b-%Y %H:%M %z')
+    end
+
+  end
+end

test/net/imap/test_imap.rb

@@ -22,44 +22,6 @@ class IMAPTest < Test::Unit::TestCase
     Socket.do_not_reverse_lookup = @do_not_reverse_lookup
   end
 
-  def test_encode_utf7
-    assert_equal("foo", Net::IMAP.encode_utf7("foo"))
-    assert_equal("&-", Net::IMAP.encode_utf7("&"))
-
-    utf8 = "\357\274\241\357\274\242\357\274\243".dup.force_encoding("UTF-8")
-    s = Net::IMAP.encode_utf7(utf8)
-    assert_equal("&,yH,Iv8j-", s)
-    s = Net::IMAP.encode_utf7("foo&#{utf8}-bar".encode("EUC-JP"))
-    assert_equal("foo&-&,yH,Iv8j--bar", s)
-
-    utf8 = "\343\201\202&".dup.force_encoding("UTF-8")
-    s = Net::IMAP.encode_utf7(utf8)
-    assert_equal("&MEI-&-", s)
-    s = Net::IMAP.encode_utf7(utf8.encode("EUC-JP"))
-    assert_equal("&MEI-&-", s)
-  end
-
-  def test_decode_utf7
-    assert_equal("&", Net::IMAP.decode_utf7("&-"))
-    assert_equal("&-", Net::IMAP.decode_utf7("&--"))
-
-    s = Net::IMAP.decode_utf7("&,yH,Iv8j-")
-    utf8 = "\357\274\241\357\274\242\357\274\243".dup.force_encoding("UTF-8")
-    assert_equal(utf8, s)
-  end
-
-  def test_format_date
-    time = Time.mktime(2009, 7, 24)
-    s = Net::IMAP.format_date(time)
-    assert_equal("24-Jul-2009", s)
-  end
-
-  def test_format_datetime
-    time = Time.mktime(2009, 7, 24, 1, 23, 45)
-    s = Net::IMAP.format_datetime(time)
-    assert_match(/\A24-Jul-2009 01:23 [+\-]\d{4}\z/, s)
-  end
-
   if defined?(OpenSSL::SSL::SSLError)
     def test_imaps_unknown_ca
       assert_raise(OpenSSL::SSL::SSLError) do

test/net/imap/test_imap_data_encoding.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require "net/imap"
+require "test/unit"
+
+class IMAPDataEncodingTest < Test::Unit::TestCase
+
+  def test_encode_utf7
+    assert_equal("foo", Net::IMAP.encode_utf7("foo"))
+    assert_equal("&-", Net::IMAP.encode_utf7("&"))
+
+    utf8 = "\357\274\241\357\274\242\357\274\243".dup.force_encoding("UTF-8")
+    s = Net::IMAP.encode_utf7(utf8)
+    assert_equal("&,yH,Iv8j-", s)
+    s = Net::IMAP.encode_utf7("foo&#{utf8}-bar".encode("EUC-JP"))
+    assert_equal("foo&-&,yH,Iv8j--bar", s)
+
+    utf8 = "\343\201\202&".dup.force_encoding("UTF-8")
+    s = Net::IMAP.encode_utf7(utf8)
+    assert_equal("&MEI-&-", s)
+    s = Net::IMAP.encode_utf7(utf8.encode("EUC-JP"))
+    assert_equal("&MEI-&-", s)
+  end
+
+  def test_decode_utf7
+    assert_equal("&", Net::IMAP.decode_utf7("&-"))
+    assert_equal("&-", Net::IMAP.decode_utf7("&--"))
+
+    s = Net::IMAP.decode_utf7("&,yH,Iv8j-")
+    utf8 = "\357\274\241\357\274\242\357\274\243".dup.force_encoding("UTF-8")
+    assert_equal(utf8, s)
+  end
+
+  def test_format_date
+    time = Time.mktime(2009, 7, 24)
+    s = Net::IMAP.format_date(time)
+    assert_equal("24-Jul-2009", s)
+  end
+
+  def test_format_datetime
+    time = Time.mktime(2009, 7, 24, 1, 23, 45)
+    s = Net::IMAP.format_datetime(time)
+    assert_match(/\A24-Jul-2009 01:23 [+\-]\d{4}\z/, s)
+  end
+
+end