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

Partially implements #10.

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

2 files changed, 48 insertions, 40 deletions

diff --git a/lib/net/imap.rb b/lib/net/imap.rb
index fe56bc0810..862b10ee39 100644
--- a/lib/net/imap.rb
+++ b/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:
diff --git a/lib/net/imap/data_encoding.rb b/lib/net/imap/data_encoding.rb
new file mode 100644
index 0000000000..d8449f582c
--- /dev/null
+++ b/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