Refactor add_property

Change implementation of the add_property method which allows for
dynamically adding attributes from outside the gem. We made it
simpler to construct the args needed for this method and refactored
the logic and tests.

lib/microformats2/format.rb

@@ -28,14 +28,18 @@ module Microformats2
 
     def parse_properties
       PropertyParser.parse(@element.children).each do |property|
-        add_property(property)
+        assign_property(property)
       end
     end
 
-    def add_property(property)
-      save_property_name(property.method_name)
-      define_method(property.method_name)
-      set_value(property.method_name, property)
+    def add_property(property_class, value)
+      # NOTE: Might want to DRY this up with what is in PropertyParser
+      prefix = property_class.split("-").first
+      # find ruby class for kind of property
+      klass = Microformats2::Property::PREFIX_CLASS_MAP[prefix]
+      # We don't have a nokogiri element so pass in nil
+      property = klass.new(nil, property_class, value)
+      assign_property(property)
     end
 
     def parse_implied_properties
@@ -68,6 +72,12 @@ module Microformats2
 
     private
 
+    def assign_property(property)
+      save_property_name(property.method_name)
+      define_method(property.method_name)
+      set_value(property.method_name, property)
+    end
+
     def to_method_name(html_class)
       # p-class-name -> class_name
       mn = html_class.downcase.split("-")[1..-1].join("_")

lib/microformats2/property/foundation.rb

@@ -3,9 +3,10 @@ module Microformats2
     class Foundation
       attr_reader :method_name
 
-      def initialize(element, html_class)
+      def initialize(element, html_class, string_value=nil)
         @element = element
         @method_name = to_method_name(html_class)
+        @string_value = string_value
       end
 
       def parse
@@ -15,7 +16,7 @@ module Microformats2
       end
 
       def to_s
-        @to_s ||= value_class_pattern || element_value || text_value
+        @to_s ||= string_value || value_class_pattern || element_value || text_value
       end
 
       def format
@@ -52,6 +53,10 @@ module Microformats2
         @element.inner_text.gsub(/\n+/, " ").gsub(/\s+/, " ").strip
       end
 
+      def string_value
+        @string_value
+      end
+
       def attribute
         attr_map[@element.name]
       end
@@ -71,6 +76,7 @@ module Microformats2
       end
 
       def format_classes
+        return [] unless @element
         @format_classes = @element.attribute("class").to_s.split.select do |html_class|
           html_class =~ Format::CLASS_REG_EXP
         end