Add and use decode_www_form_component_18

This replaces URI encoded chars back into their original form.

lib/zero/patches/uri.rb

@@ -2,7 +2,8 @@ module URI
 
     # Gets a query string and splits it into its key value pairs.
     # If URI already supports this functionality (decode_www_form on Ruby 1.9+),
-    # it will use this. Else ... nothing at the moment.
+    # it will use this. Else it will run an onw implementation, without any
+    # encoding functionality.
     #
     # @param [String] query The query string
     # @return [Array] Parsed query
@@ -17,6 +18,7 @@ module URI
       return self.decode_www_form_18 query
     end
 
+
     # Own implementation of decode_www_form.
     # Shall behave almost like the original method, but without any encoding
     # stuff.
@@ -35,36 +37,54 @@ module URI
       query.split(/[&;]/).each do |query_part|
         # breakes the string parts at =
         key, value = query_part.split('=')
+
+        # make an empty string out of value, if it's nil
+        value = '' if value.nil?
         # append the key value pair on the result array
-        parsed << [key, value]
+        parsed << [
+          decode_www_form_component_18(key),
+          decode_www_form_component_18(value)
+        ]
       end
       # return result array
       return parsed
     end
 
-=begin
-    WFKV_ = '(?:[^%#=;&]*(?:%\h\h[^%#=;&]*)*)'
+    TBLDECWWWCOMP18_ = {}
 
-    def self.decode_www_form(str, enc= nil)
-      return [] if str.empty?
-      unless /\A#{WFKV_}=#{WFKV_}(?:[;&]#{WFKV_}=#{WFKV_})*\z/ =~ str
-        raise ArgumentError,
-          "invalid data of application/x-www-form-urlencoded (#{str})"
+    # Own implementation of decode_www_form_component.
+    # Shall behave almost like the original method, but without any encoding
+    # stuff.
+    #
+    # @param [String] string 
+    # @return [String]
+    #
+    def self.decode_www_form_component_18(string) 
+      # Fill table for URI special chars
+      if TBLDECWWWCOMP18_.empty?
+        tbl = {}
+        256.times do |i|
+          h, l = i>>4, i&15
+          tbl['%%%X%X' % [h, l]] = i.chr
+          tbl['%%%x%X' % [h, l]] = i.chr
+          tbl['%%%X%x' % [h, l]] = i.chr
+          tbl['%%%x%x' % [h, l]] = i.chr
+        end
+        tbl['+'] = ' '
+        begin
+          TBLDECWWWCOMP18_.replace(tbl)
+          TBLDECWWWCOMP18_.freeze
+        rescue
+        end
       end
-      ary = []
-      $&.scan(/([^=;&]+)=([^;&]*)/) do
-        ary << [
-          decode_www_form_component($1, enc),
-          decode_www_form_component($2, enc)
-        ]
-      end
-      ary
-    end
+      # unless /\A[^%]*(?:%\h\h[^%]*)*\z/ =~ str
+      #   raise ArgumentError, "invalid %-encoding (#{str})"
+      # end
 
-    def self.decode_www_form_component(str, enc= nil)
-      raise ArgumentError, "invalid %-encoding (#{str})" unless /\A[^%]*(?:%\h\h[^%]*)*\z/ =~ str
-      str.gsub(/\+|%\h\h/, TBLDECWWWCOMP_).force_encoding(enc)
+      # Replace URI special chars
+      string.gsub(/\+|%[a-zA-Z0-9]{2}/) do |sub_string|
+        TBLDECWWWCOMP18_[sub_string]
+      end
     end
-=end
 
 end