def lookup_variable(context, variable)
      lookup = context

      variable.split(".").each do |value|
        lookup = lookup[value]
      end

      lookup || variable
    end
def lookup_variable(context, variable)
      lookup = context

      variable.split(".").each do |value|
        lookup = lookup[value]
      end

      lookup || variable
    end
Lookup a Liquid variable in the given context.

 context  - the Liquid context in question.
 variable - the variable name, as a string.

 Returns the value of the variable in the context
   or the variable name if not found.