# File lib/arel/visitors/visitor.rb, line 4 def initialize @dispatch = get_dispatch_cache end
# File lib/arel/visitors/visitor.rb, line 14 def self.dispatch_cache Hash.new do |hash, klass| hash[klass] = "visit_#{(klass.name || '').gsub('::', '_')}" end end
# File lib/arel/visitors/visitor.rb, line 8 def accept object visit object end
# File lib/arel/visitors/visitor.rb, line 24 def dispatch @dispatch end
# File lib/arel/visitors/visitor.rb, line 20 def get_dispatch_cache self.class.dispatch_cache end
# File lib/arel/visitors/visitor.rb, line 28 def visit object send dispatch[object.class], object rescue NoMethodError => e raise e if respond_to?(dispatch[object.class], true) superklass = object.class.ancestors.find { |klass| respond_to?(dispatch[klass], true) } raise(TypeError, "Cannot visit #{object.class}") unless superklass dispatch[object.class] = dispatch[superklass] retry end