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https://github.com/Shopify/liquid.git
synced 2026-09-16 09:20:42 -07:00
Jean Boussier
c588337aac
Including a module can cause Ruby's global constant cache to be busted if the included module contain constants. So that's something you don't want to happen at "runtime", otherwise it will severely degrade performance and if you are using YJIT or MJIT most of the compiled code will be invalidated. To limit the impact of this, we can pre-include the global filters, as they're generally registered during boot, that limits the problem to non-global filters.
59 lines
1.6 KiB
Ruby
59 lines
1.6 KiB
Ruby
# frozen_string_literal: true
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require 'set'
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module Liquid
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# StrainerTemplate is the computed class for the filters system.
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# New filters are mixed into the strainer class which is then instantiated for each liquid template render run.
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#
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# The Strainer only allows method calls defined in filters given to it via StrainerFactory.add_global_filter,
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# Context#add_filters or Template.register_filter
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class StrainerTemplate
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def initialize(context)
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@context = context
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end
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class << self
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def add_filter(filter)
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return if include?(filter)
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invokable_non_public_methods = (filter.private_instance_methods + filter.protected_instance_methods).select { |m| invokable?(m) }
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if invokable_non_public_methods.any?
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raise MethodOverrideError, "Filter overrides registered public methods as non public: #{invokable_non_public_methods.join(', ')}"
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end
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include(filter)
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filter_methods.merge(filter.public_instance_methods.map(&:to_s))
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end
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def invokable?(method)
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filter_methods.include?(method.to_s)
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end
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def inherited(subclass)
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super
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subclass.instance_variable_set(:@filter_methods, @filter_methods.dup)
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end
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private
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def filter_methods
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@filter_methods ||= Set.new
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end
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end
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def invoke(method, *args)
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if self.class.invokable?(method)
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send(method, *args)
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elsif @context.strict_filters
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raise Liquid::UndefinedFilter, "undefined filter #{method}"
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else
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args.first
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end
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rescue ::ArgumentError => e
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raise Liquid::ArgumentError, e.message, e.backtrace
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end
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end
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end
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