Initial github import of liquid

lib/liquid/drop.rb

@@ -0,0 +1,48 @@
+module Liquid
+  
+  # A drop in liquid is a class which allows you to to export DOM like things to liquid
+  # Methods of drops are callable. 
+  # The main use for liquid drops is the implement lazy loaded objects. 
+  # If you would like to make data available to the web designers which you don't want loaded unless needed then 
+  # a drop is a great way to do that
+  #
+  # Example:
+  #
+  # class ProductDrop < Liquid::Drop
+  #   def top_sales
+  #      Shop.current.products.find(:all, :order => 'sales', :limit => 10 )
+  #   end
+  # end
+  #  
+  # tmpl = Liquid::Template.parse( ' {% for product in product.top_sales %} {{ product.name }} {%endfor%} '  )
+  # tmpl.render('product' => ProductDrop.new ) # will invoke top_sales query. 
+  #
+  # Your drop can either implement the methods sans any parameters or implement the before_method(name) method which is a 
+  # catch all
+  class Drop
+    attr_writer :context
+
+    # Catch all for the method 
+    def before_method(method)
+      nil
+    end
+    
+    # called by liquid to invoke a drop
+    def invoke_drop(method)      
+      result = before_method(method)
+      result ||= send(method.to_sym) if self.class.public_instance_methods.include?(method.to_s)
+      result
+    end
+    
+    def has_key?(name)
+      true
+    end
+    
+    def to_liquid
+      self
+    end
+
+    alias :[] :invoke_drop
+  end
+  
+end