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Contents
require 'set'
module Liquid
parent_object = if defined? BlankObject
BlankObject
else
Object
end
# Strainer is the parent class for the filters system.
# New filters are mixed into the strainer class which is then instanciated for each liquid template render run.
#
# One of the strainer's responsibilities is to keep malicious method calls out
class Strainer < parent_object #:nodoc:
INTERNAL_METHOD = /^__/
@@required_methods = Set.new([:__id__, :__send__, :respond_to?, :extend, :methods, :class, :object_id])
# Ruby 1.9.2 introduces Object#respond_to_missing?, which is invoked by Object#respond_to?
@@required_methods << :respond_to_missing? if Object.respond_to? :respond_to_missing?
@@filters = {}
def initialize(context)
@context = context
end
def self.global_filter(filter)
raise ArgumentError, "Passed filter is not a module" unless filter.is_a?(Module)
@@filters[filter.name] = filter
end
def self.create(context)
strainer = Strainer.new(context)
@@filters.each { |k,m| strainer.extend(m) }
strainer
end
def respond_to?(method, include_private = false)
method_name = method.to_s
return false if method_name =~ INTERNAL_METHOD
return false if @@required_methods.include?(method_name)
super
end
# remove all standard methods from the bucket so circumvent security
# problems
instance_methods.each do |m|
unless @@required_methods.include?(m.to_sym)
undef_method m
end
end
end
end
Version data entries
37 entries across 37 versions & 5 rubygems