Add Visitor Pattern , JSON_VISITOR and PRINT_JSON_VISITOR

json/visitor/json_visitor.e

@@ -0,0 +1,61 @@
+indexing
+	description:
+
+		"JSON Visitor"
+
+	pattern: "Visitor"
+	author: "Javier Velilla"
+	license:"MIT (see http://www.opensource.org/licenses/mit-license.php)"
+	date: "2008/08/24"
+	revision: "Revision 0.1"
+
+deferred class
+	JSON_VISITOR
+
+feature -- Visitor Pattern
+
+	visit_json_array (a_json_array: JSON_ARRAY) is
+			-- Visit `a_json_array'.
+		require
+			a_json_array_not_void: a_json_array /= Void
+		deferred
+		end
+
+	visit_json_boolean (a_json_boolean: JSON_BOOLEAN) is
+			-- Visit `a_json_boolean'.
+		require
+			a_json_boolean_not_void: a_json_boolean /= Void
+		deferred
+		end
+
+	visit_json_null (a_json_null: JSON_NULL) is
+			-- Visit `a_json_null'.
+		require
+			a_json_null_not_void: a_json_null /= Void
+		deferred
+		end
+
+
+	visit_json_number (a_json_number: JSON_NUMBER) is
+			-- Visit `a_json_number'.
+		require
+			a_json_number_not_void: a_json_number /= Void
+		deferred
+		end
+
+	visit_json_object (a_json_object: JSON_OBJECT) is
+			-- Visit `a_json_object'.
+		require
+			a_json_object_not_void: a_json_object /= Void
+		deferred
+		end
+
+    visit_json_string (a_json_string: JSON_STRING) is
+			-- Visit `a_json_string'.
+		require
+			a_json_string_not_void: a_json_string /= Void
+		deferred
+		end
+
+
+end