First version of URI Template library

as specified by http://tools.ietf.org/html/draft-gregorio-uritemplate-05
(it seems to contains some error in the spec .. or minor incoherences, to double check)
The matcher is basic, it does not handle all the details of the string builder, but that seems ok for now.

library/text/encoder/src/url_encoder.e

@@ -1,5 +1,9 @@
 note
-	description: "Summary description for {URL_ENCODER}."
+	description: "[
+			Summary description for {URL_ENCODER}.
+			
+			See: http://www.faqs.org/rfcs/rfc3986.html
+		]"
 	legal: "See notice at end of class."
 	status: "See notice at end of class."
 	date: "$Date$"
@@ -59,6 +63,47 @@ feature -- Encoder
 			end
 		end
 
+	partial_encoded_string (s: STRING_32; a_ignore: ARRAY [CHARACTER]): STRING_8
+			-- URL-encoded value of `s'.
+		local
+			i, n: INTEGER
+			uc: CHARACTER_32
+			c: CHARACTER_8
+		do
+			has_error := False
+			create Result.make (s.count + s.count // 10)
+			n := s.count
+			from i := 1 until i > n loop
+				uc := s.item (i)
+				if uc.is_character_8 then
+					c := uc.to_character_8
+					inspect c
+					when
+						'A' .. 'Z',
+						'a' .. 'z', '0' .. '9',
+						'.', '-', '~', '_'
+					then
+						Result.extend (c)
+					when ' ' then
+						Result.extend ('+')
+					else
+						if a_ignore.has (c) then
+							Result.extend (c)
+						else
+							Result.append (url_encoded_char (uc))
+						end
+					end
+				else
+					if a_ignore.has (c) then
+						Result.extend (c)
+					else
+						Result.append (url_encoded_char (uc))
+					end
+				end
+				i := i + 1
+			end
+		end
+
 feature {NONE} -- encoder character
 
 	url_encoded_char (uc: CHARACTER_32): STRING_8
@@ -309,7 +354,7 @@ feature {NONE} -- Hexadecimal and strings
 		end
 
 note
-	copyright: "Copyright (c) 1984-2011, Eiffel Software and others"
+	copyright: "2011-2011, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
 	source: "[
 			Eiffel Software