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# frozen_string_literal: true
require 'set'
module Liquid
# StrainerTemplate is the computed class for the filters system.
# New filters are mixed into the strainer class which is then instantiated for each liquid template render run.
#
# The Strainer only allows method calls defined in filters given to it via StrainerFactory.add_global_filter,
# Context#add_filters or Template.register_filter
class StrainerTemplate
def initialize(context)
@context = context
end
class << self
def add_filter(filter)
return if include?(filter)
invokable_non_public_methods = (filter.private_instance_methods + filter.protected_instance_methods).select { |m| invokable?(m) }
if invokable_non_public_methods.any?
raise MethodOverrideError, "Filter overrides registered public methods as non public: #{invokable_non_public_methods.join(', ')}"
end
include(filter)
filter_methods.merge(filter.public_instance_methods.map(&:to_s))
end
def invokable?(method)
filter_methods.include?(method.to_s)
end
def inherited(subclass)
super
subclass.instance_variable_set(:@filter_methods, @filter_methods.dup)
end
def filter_method_names
filter_methods.map(&:to_s).to_a
end
private
def filter_methods
@filter_methods ||= Set.new
end
end
def invoke(method, *args)
if self.class.invokable?(method)
send(method, *args)
elsif @context.strict_filters
raise Liquid::UndefinedFilter, "undefined filter #{method}"
else
args.first
end
rescue ::ArgumentError => e
raise Liquid::ArgumentError, e.message, e.backtrace
end
end
end
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