Remove a line feed for CI

.travis.yml

@@ -13,8 +13,6 @@ matrix:
     - rvm: *latest_ruby
       script: bundle exec rake memory_profile:run
       name: Profiling Memory Usage
-  allow_failures:
-    - rvm: ruby-head
 
 branches:
   only:

History.md

@@ -4,7 +4,6 @@
 
 * Split Strainer class as a factory and a template (#1208) [Thierry Joyal]
 * Remove handling of a nil context in the Strainer class (#1218) [Thierry Joyal]
-* StaticRegisters#fetch to raise on missing key (#1250) [Thierry Joyal]
 
 ## 4.0.3 / 2019-03-12
 

lib/liquid.rb

@@ -57,14 +57,14 @@ require 'liquid/forloop_drop'
 require 'liquid/extensions'
 require 'liquid/errors'
 require 'liquid/interrupts'
+require 'liquid/filter'
+require 'liquid/filter_template'
 require 'liquid/strainer_factory'
 require 'liquid/strainer_template'
 require 'liquid/expression'
 require 'liquid/context'
 require 'liquid/parser_switching'
 require 'liquid/tag'
-require 'liquid/tag/disabler'
-require 'liquid/tag/disableable'
 require 'liquid/block'
 require 'liquid/block_body'
 require 'liquid/document'
@@ -88,3 +88,4 @@ require 'liquid/template_factory'
 # Load all the tags of the standard library
 #
 Dir["#{__dir__}/liquid/tags/*.rb"].each { |f| require f }
+Dir["#{__dir__}/liquid/registers/*.rb"].each { |f| require f }

lib/liquid/block.rb

@@ -10,7 +10,7 @@ module Liquid
     end
 
     def parse(tokens)
-      @body = new_body
+      @body = BlockBody.new
       while parse_body(@body, tokens)
       end
     end
@@ -28,12 +28,7 @@ module Liquid
       @body.nodelist
     end
 
-    def unknown_tag(tag_name, _markup, _tokenizer)
-      Block.raise_unknown_tag(tag_name, block_name, block_delimiter, parse_context)
-    end
-
-    # @api private
-    def self.raise_unknown_tag(tag, block_name, block_delimiter, parse_context)
+    def unknown_tag(tag, _params, _tokens)
       if tag == 'else'
         raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_else",
           block_name: block_name)
@@ -55,14 +50,8 @@ module Liquid
       @block_delimiter ||= "end#{block_name}"
     end
 
-    private
+    protected
 
-    # @api public
-    def new_body
-      BlockBody.new
-    end
-
-    # @api public
     def parse_body(body, tokens)
       if parse_context.depth >= MAX_DEPTH
         raise StackLevelError, "Nesting too deep"

lib/liquid/block_body.rb

@@ -54,49 +54,28 @@ module Liquid
     end
 
     # @api private
-    def self.unknown_tag_in_liquid_tag(tag, parse_context)
-      Block.raise_unknown_tag(tag, 'liquid', '%}', parse_context)
+    def self.unknown_tag_in_liquid_tag(end_tag_name, end_tag_markup)
+      yield end_tag_name, end_tag_markup
+    ensure
+      Usage.increment("liquid_tag_contains_outer_tag") unless $ERROR_INFO.is_a?(SyntaxError)
     end
 
-    # @api private
-    def self.raise_missing_tag_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination", token: token, tag_end: TagEnd.inspect)
-    end
-
-    # @api private
-    def self.raise_missing_variable_terminator(token, parse_context)
-      raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination", token: token, tag_end: VariableEnd.inspect)
-    end
-
-    # @api private
-    def self.render_node(context, output, node)
-      node.render_to_output_buffer(context, output)
-    rescue UndefinedVariable, UndefinedDropMethod, UndefinedFilter => e
-      context.handle_error(e, node.line_number)
-    rescue MemoryError
-      raise
-    rescue ::StandardError => e
-      line_number = node.is_a?(String) ? nil : node.line_number
-      output << context.handle_error(e, line_number)
-    end
-
-    private def parse_liquid_tag(markup, parse_context)
+    private def parse_liquid_tag(markup, parse_context, &block)
       liquid_tag_tokenizer = Tokenizer.new(markup, line_number: parse_context.line_number, for_liquid_tag: true)
-      parse_for_liquid_tag(liquid_tag_tokenizer, parse_context) do |end_tag_name, _end_tag_markup|
-        if end_tag_name
-          BlockBody.unknown_tag_in_liquid_tag(end_tag_name, parse_context)
-        end
+      parse_for_liquid_tag(liquid_tag_tokenizer, parse_context) do |end_tag_name, end_tag_markup|
+        next unless end_tag_name
+        self.class.unknown_tag_in_liquid_tag(end_tag_name, end_tag_markup, &block)
       end
     end
 
-    private def parse_for_document(tokenizer, parse_context)
+    private def parse_for_document(tokenizer, parse_context, &block)
       while (token = tokenizer.shift)
         next if token.empty?
         case
         when token.start_with?(TAGSTART)
           whitespace_handler(token, parse_context)
           unless token =~ FullToken
-            BlockBody.raise_missing_tag_terminator(token, parse_context)
+            raise_missing_tag_terminator(token, parse_context)
           end
           tag_name = Regexp.last_match(2)
           markup   = Regexp.last_match(4)
@@ -108,7 +87,7 @@ module Liquid
           end
 
           if tag_name == 'liquid'
-            parse_liquid_tag(markup, parse_context)
+            parse_liquid_tag(markup, parse_context, &block)
             next
           end
 
@@ -142,11 +121,7 @@ module Liquid
       if token[2] == WhitespaceControl
         previous_token = @nodelist.last
         if previous_token.is_a?(String)
-          first_byte = previous_token.getbyte(0)
           previous_token.rstrip!
-          if previous_token.empty? && parse_context[:bug_compatible_whitespace_trimming] && first_byte
-            previous_token << first_byte
-          end
         end
       end
       parse_context.trim_whitespace = (token[-3] == WhitespaceControl)
@@ -156,47 +131,38 @@ module Liquid
       @blank
     end
 
-    # Remove blank strings in the block body for a control flow tag (e.g. `if`, `for`, `case`, `unless`)
-    # with a blank body.
-    #
-    # For example, in a conditional assignment like the following
-    #
-    # ```
-    # {% if size > max_size %}
-    #   {% assign size = max_size %}
-    # {% endif %}
-    # ```
-    #
-    # we assume the intention wasn't to output the blank spaces in the `if` tag's block body, so this method
-    # will remove them to reduce the render output size.
-    #
-    # Note that it is now preferred to use the `liquid` tag for this use case.
-    def remove_blank_strings
-      raise "remove_blank_strings only support being called on a blank block body" unless @blank
-      @nodelist.reject! { |node| node.instance_of?(String) }
-    end
-
     def render(context)
       render_to_output_buffer(context, +'')
     end
 
     def render_to_output_buffer(context, output)
-      context.resource_limits.increment_render_score(@nodelist.length)
+      context.resource_limits.render_score += @nodelist.length
 
       idx = 0
       while (node = @nodelist[idx])
-        if node.instance_of?(String)
+        previous_output_size = output.bytesize
+
+        case node
+        when String
           output << node
-        else
+        when Variable
           render_node(context, output, node)
+        when Block
+          render_node(context, node.blank? ? +'' : output, node)
+          break if context.interrupt? # might have happened in a for-block
+        when Continue, Break
           # If we get an Interrupt that means the block must stop processing. An
           # Interrupt is any command that stops block execution such as {% break %}
-          # or {% continue %}. These tags may also occur through Block or Include tags.
-          break if context.interrupt? # might have happened in a for-block
+          # or {% continue %}
+          context.push_interrupt(node.interrupt)
+          break
+        else # Other non-Block tags
+          render_node(context, output, node)
+          break if context.interrupt? # might have happened through an include
         end
         idx += 1
 
-        context.resource_limits.increment_write_score(output)
+        raise_if_resource_limits_reached(context, output.bytesize - previous_output_size)
       end
 
       output
@@ -205,7 +171,29 @@ module Liquid
     private
 
     def render_node(context, output, node)
-      BlockBody.render_node(context, output, node)
+      if node.disabled?(context)
+        output << node.disabled_error_message
+        return
+      end
+      disable_tags(context, node.disabled_tags) do
+        node.render_to_output_buffer(context, output)
+      end
+    rescue UndefinedVariable, UndefinedDropMethod, UndefinedFilter => e
+      context.handle_error(e, node.line_number)
+    rescue ::StandardError => e
+      line_number = node.is_a?(String) ? nil : node.line_number
+      output << context.handle_error(e, line_number)
+    end
+
+    def disable_tags(context, tags, &block)
+      return yield if tags.empty?
+      context.registers[:disabled_tags].disable(tags, &block)
+    end
+
+    def raise_if_resource_limits_reached(context, length)
+      context.resource_limits.render_length += length
+      return unless context.resource_limits.reached?
+      raise MemoryError, "Memory limits exceeded"
     end
 
     def create_variable(token, parse_context)
@@ -213,17 +201,15 @@ module Liquid
         markup = content.first
         return Variable.new(markup, parse_context)
       end
-      BlockBody.raise_missing_variable_terminator(token, parse_context)
+      raise_missing_variable_terminator(token, parse_context)
     end
 
-    # @deprecated Use {.raise_missing_tag_terminator} instead
     def raise_missing_tag_terminator(token, parse_context)
-      BlockBody.raise_missing_tag_terminator(token, parse_context)
+      raise SyntaxError, parse_context.locale.t("errors.syntax.tag_termination", token: token, tag_end: TagEnd.inspect)
     end
 
-    # @deprecated Use {.raise_missing_variable_terminator} instead
     def raise_missing_variable_terminator(token, parse_context)
-      BlockBody.raise_missing_variable_terminator(token, parse_context)
+      raise SyntaxError, parse_context.locale.t("errors.syntax.variable_termination", token: token, tag_end: VariableEnd.inspect)
     end
 
     def registered_tags

lib/liquid/context.rb

@@ -44,7 +44,6 @@ module Liquid
       @interrupts    = []
       @filters       = []
       @global_filter = nil
-      @disabled_tags = {}
     end
     # rubocop:enable Metrics/ParameterLists
 
@@ -145,7 +144,6 @@ module Liquid
         subcontext.strainer = nil
         subcontext.errors   = errors
         subcontext.warnings = warnings
-        subcontext.disabled_tags = @disabled_tags
       end
     end
 
@@ -210,24 +208,9 @@ module Liquid
       end
     end
 
-    def with_disabled_tags(tag_names)
-      tag_names.each do |name|
-        @disabled_tags[name] = @disabled_tags.fetch(name, 0) + 1
-      end
-      yield
-    ensure
-      tag_names.each do |name|
-        @disabled_tags[name] -= 1
-      end
-    end
-
-    def tag_disabled?(tag_name)
-      @disabled_tags.fetch(tag_name, 0) > 0
-    end
-
     protected
 
-    attr_writer :base_scope_depth, :warnings, :errors, :strainer, :filters, :disabled_tags
+    attr_writer :base_scope_depth, :warnings, :errors, :strainer, :filters
 
     private
 

lib/liquid/document.rb

@@ -1,33 +1,23 @@
 # frozen_string_literal: true
 
 module Liquid
-  class Document
+  class Document < BlockBody
     def self.parse(tokens, parse_context)
-      doc = new(parse_context)
+      doc = new
       doc.parse(tokens, parse_context)
       doc
     end
 
-    attr_reader :parse_context, :body
-
-    def initialize(parse_context)
-      @parse_context = parse_context
-      @body = new_body
-    end
-
-    def nodelist
-      @body.nodelist
-    end
-
-    def parse(tokenizer, parse_context)
-      while parse_body(tokenizer)
+    def parse(tokens, parse_context)
+      super do |end_tag_name, _end_tag_params|
+        unknown_tag(end_tag_name, parse_context) if end_tag_name
       end
     rescue SyntaxError => e
       e.line_number ||= parse_context.line_number
       raise
     end
 
-    def unknown_tag(tag, _markup, _tokenizer)
+    def unknown_tag(tag, parse_context)
       case tag
       when 'else', 'end'
         raise SyntaxError, parse_context.locale.t("errors.syntax.unexpected_outer_tag", tag: tag)
@@ -35,30 +25,5 @@ module Liquid
         raise SyntaxError, parse_context.locale.t("errors.syntax.unknown_tag", tag: tag)
       end
     end
-
-    def render_to_output_buffer(context, output)
-      @body.render_to_output_buffer(context, output)
-    end
-
-    def render(context)
-      @body.render(context)
-    end
-
-    private
-
-    def new_body
-      Liquid::BlockBody.new
-    end
-
-    def parse_body(tokenizer)
-      @body.parse(tokenizer, parse_context) do |unknown_tag_name, unknown_tag_markup|
-        if unknown_tag_name
-          unknown_tag(unknown_tag_name, unknown_tag_markup, tokenizer)
-          true
-        else
-          false
-        end
-      end
-    end
   end
 end

lib/liquid/errors.rb

@@ -46,6 +46,7 @@ module Liquid
   StandardError       = Class.new(Error)
   SyntaxError         = Class.new(Error)
   StackLevelError     = Class.new(Error)
+  TaintedError        = Class.new(Error)
   MemoryError         = Class.new(Error)
   ZeroDivisionError   = Class.new(Error)
   FloatDomainError    = Class.new(Error)
@@ -53,6 +54,5 @@ module Liquid
   UndefinedDropMethod = Class.new(Error)
   UndefinedFilter     = Class.new(Error)
   MethodOverrideError = Class.new(Error)
-  DisabledError       = Class.new(Error)
   InternalError       = Class.new(Error)
 end

lib/liquid/filter.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'set'
+
+module Liquid
+  # A filter in liquid is a class which contain invokable logic from liquid templates.
+  #
+  # Public methods in filter classes are callable.
+  #
+  # The use for liquid filters is to make logic functions available to the web designers.
+  #
+  # Example:
+  #
+  #   class StringFilter < Liquid::Filter
+  #     def upcase(input)
+  #       input.upcase
+  #     end
+  #   end
+  #
+  #   tmpl = Liquid::Template.parse('Result: {{ "test" | upcase }}')
+  #   tmpl.render({}, filters: [StringFilter])
+  #   => "Result: TEST"
+  class Filter
+    class << self
+      def invokable_methods
+        @invokable_methods ||= begin
+          blacklist = Liquid::Filter.public_instance_methods
+          whitelist = public_instance_methods - blacklist
+
+          Set.new(whitelist.map(&:to_s))
+        end
+      end
+    end
+
+    def initialize(context)
+      @context = context
+    end
+
+    private
+
+    attr_reader :context
+  end
+end

lib/liquid/filter_template.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require 'set'
+
+module Liquid
+  # FilterTemplate is the computed class for the filters system.
+  #
+  # Historically Liquid used to include filters as Module to the context strainer.
+  # This lead to the absence of sandbox between filters (one filter could override private methods of another filter).
+  #
+  # With the implementation of Liquid::Filter, it is now possible for the modules from legacy code to be automatically
+  #   wrapped into a Liquid::Filter generated class.
+  #
+  # This should not be considered as the base behaviour, it is preferred to create filters going forward directly as
+  #   classes that are child of Liquid::Filter.
+  class FilterTemplate < Filter
+    class << self
+      def include(mod)
+        super
+
+        @init_module = mod
+      end
+
+      # Override of the `invokable_methods`.
+      # We can't rely on the parent logic as some modules might have been defining methods that shadow Class methods.
+      #
+      # Eg.:
+      # mod = Liquid::StandardFilters
+      # filter = Class.new(FilterTemplate)
+      # filter.include(mod)
+      # mod.public_instance_methods - (filter.public_instance_methods - Class.public_instance_methods)
+      # => [:prepend]
+      def invokable_methods
+        whitelist = @init_module.public_instance_methods
+
+        @invokable_methods ||= Set.new(whitelist.map(&:to_s))
+      end
+    end
+  end
+end

lib/liquid/profiler/hooks.rb

@@ -1,21 +1,25 @@
 # frozen_string_literal: true
 
 module Liquid
-  module BlockBodyProfilingHook
-    def render_node(context, output, node)
+  class BlockBody
+    def render_node_with_profiling(context, output, node)
       Profiler.profile_node_render(node) do
-        super
+        render_node_without_profiling(context, output, node)
       end
     end
-  end
-  BlockBody.prepend(BlockBodyProfilingHook)
 
-  module IncludeProfilingHook
-    def render_to_output_buffer(context, output)
+    alias_method :render_node_without_profiling, :render_node
+    alias_method :render_node, :render_node_with_profiling
+  end
+
+  class Include < Tag
+    def render_to_output_buffer_with_profiling(context, output)
       Profiler.profile_children(context.evaluate(@template_name_expr).to_s) do
-        super
+        render_to_output_buffer_without_profiling(context, output)
       end
     end
+
+    alias_method :render_to_output_buffer_without_profiling, :render_to_output_buffer
+    alias_method :render_to_output_buffer, :render_to_output_buffer_with_profiling
   end
-  Include.prepend(IncludeProfilingHook)
 end

lib/liquid/registers/disabled_tags.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+module Liquid
+  class DisabledTags < Register
+    def initialize
+      @disabled_tags = {}
+    end
+
+    def disabled?(tag)
+      @disabled_tags.key?(tag) && @disabled_tags[tag] > 0
+    end
+
+    def disable(tags)
+      tags.each(&method(:increment))
+      yield
+    ensure
+      tags.each(&method(:decrement))
+    end
+
+    private
+
+    def increment(tag)
+      @disabled_tags[tag] ||= 0
+      @disabled_tags[tag]  += 1
+    end
+
+    def decrement(tag)
+      @disabled_tags[tag] -= 1
+    end
+  end
+
+  Template.add_register(:disabled_tags, DisabledTags.new)
+end

lib/liquid/resource_limits.rb

@@ -2,8 +2,8 @@
 
 module Liquid
   class ResourceLimits
-    attr_accessor :render_length_limit, :render_score_limit, :assign_score_limit
-    attr_reader :render_score, :assign_score
+    attr_accessor :render_length, :render_score, :assign_score,
+      :render_length_limit, :render_score_limit, :assign_score_limit
 
     def initialize(limits)
       @render_length_limit = limits[:render_length_limit]
@@ -12,51 +12,14 @@ module Liquid
       reset
     end
 
-    def increment_render_score(amount)
-      @render_score += amount
-      raise_limits_reached if @render_score_limit && @render_score > @render_score_limit
-    end
-
-    def increment_assign_score(amount)
-      @assign_score += amount
-      raise_limits_reached if @assign_score_limit && @assign_score > @assign_score_limit
-    end
-
-    # update either render_length or assign_score based on whether or not the writes are captured
-    def increment_write_score(output)
-      if (last_captured = @last_capture_length)
-        captured = output.bytesize
-        increment = captured - last_captured
-        @last_capture_length = captured
-        increment_assign_score(increment)
-      elsif @render_length_limit && output.bytesize > @render_length_limit
-        raise_limits_reached
-      end
-    end
-
-    def raise_limits_reached
-      @reached_limit = true
-      raise MemoryError, "Memory limits exceeded"
-    end
-
     def reached?
-      @reached_limit
+      (@render_length_limit && @render_length > @render_length_limit) ||
+        (@render_score_limit && @render_score > @render_score_limit) ||
+        (@assign_score_limit && @assign_score > @assign_score_limit)
     end
 
     def reset
-      @reached_limit = false
-      @last_capture_length = nil
-      @render_score = @assign_score = 0
-    end
-
-    def with_capture
-      old_capture_length = @last_capture_length
-      begin
-        @last_capture_length = 0
-        yield
-      ensure
-        @last_capture_length = old_capture_length
-      end
+      @render_length = @render_score = @assign_score = 0
     end
   end
 end

lib/liquid/standardfilters.rb

@@ -41,7 +41,7 @@ module Liquid
     end
 
     def escape(input)
-      CGI.escapeHTML(input.to_s) unless input.nil?
+      CGI.escapeHTML(input.to_s).untaint unless input.nil?
     end
     alias_method :h, :escape
 

lib/liquid/static_registers.rb

@@ -2,7 +2,7 @@
 
 module Liquid
   class StaticRegisters
-    attr_reader :static
+    attr_reader :static, :registers
 
     def initialize(registers = {})
       @static    = registers.is_a?(StaticRegisters) ? registers.static : registers
@@ -25,16 +25,8 @@ module Liquid
       @registers.delete(key)
     end
 
-    UNDEFINED = Object.new
-
-    def fetch(key, default = UNDEFINED, &block)
-      if @registers.key?(key)
-        @registers.fetch(key)
-      elsif default != UNDEFINED
-        @static.fetch(key, default, &block)
-      else
-        @static.fetch(key, &block)
-      end
+    def fetch(key, default = nil)
+      key?(key) ? self[key] : default
     end
 
     def key?(key)

lib/liquid/strainer_template.rb

@@ -14,40 +14,69 @@ module Liquid
     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(', ')}"
+      def add_filter(mod)
+        filter = if mod.is_a?(Class) && mod.ancestors.include?(Liquid::Filter)
+          mod
+        elsif mod.instance_of?(Module)
+          convert_mod_to_filter(mod)
+        else
+          raise(ArgumentError, "wrong argument type Proc (expected Liquid::Filter)")
         end
 
-        include(filter)
+        filter.invokable_methods.each do |method|
+          filter_method_map[method] = filter
+        end
+      end
 
-        filter_methods.merge(filter.public_instance_methods.map(&:to_s))
+      def filter_for(method)
+        filter_method_map[method]
       end
 
       def invokable?(method)
-        filter_methods.include?(method.to_s)
+        filter_method_map.key?(method)
       end
 
       private
 
-      def filter_methods
-        @filter_methods ||= Set.new
+      def filter_method_map
+        @filter_method_map ||= {}
+      end
+
+      def convert_mod_to_filter(mod)
+        @filter_classes ||= {}
+        @filter_classes[mod] ||= begin
+          klass = Class.new(FilterTemplate)
+          klass.include(mod)
+          klass
+        end
       end
     end
 
     def invoke(method, *args)
       if self.class.invokable?(method)
-        send(method, *args)
-      elsif @context.strict_filters
-        raise Liquid::UndefinedFilter, "undefined filter #{method}"
+        begin
+          instance = filter_instance_for(method)
+          instance.public_send(method, *args)
+        rescue ::ArgumentError => e
+          raise Liquid::ArgumentError, e.message, e.backtrace
+        end
+      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
+
+    private
+
+    def filter_instance_for(method)
+      @filter_instances ||= {}
+      @filter_instances.fetch(method) do
+        klass = self.class.filter_for(method)
+        klass.new(context)
+      end
+    end
+
+    attr_reader :context
   end
 end

lib/liquid/tag.rb

@@ -13,13 +13,15 @@ module Liquid
         tag
       end
 
-      def disable_tags(*tag_names)
-        @disabled_tags ||= []
-        @disabled_tags.concat(tag_names)
-        prepend(Disabler)
+      def disable_tags(*tags)
+        disabled_tags.push(*tags)
       end
 
       private :new
+
+      def disabled_tags
+        @disabled_tags ||= []
+      end
     end
 
     def initialize(tag_name, markup, parse_context)
@@ -44,6 +46,14 @@ module Liquid
       ''
     end
 
+    def disabled?(context)
+      context.registers[:disabled_tags].disabled?(tag_name)
+    end
+
+    def disabled_error_message
+      "#{tag_name} #{options[:locale].t('errors.disabled.tag')}"
+    end
+
     # For backwards compatibility with custom tags. In a future release, the semantics
     # of the `render_to_output_buffer` method will become the default and the `render`
     # method will be removed.
@@ -55,5 +65,9 @@ module Liquid
     def blank?
       false
     end
+
+    def disabled_tags
+      self.class.disabled_tags
+    end
   end
 end

lib/liquid/tag/disableable.rb

@@ -1,22 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Tag
-    module Disableable
-      def render_to_output_buffer(context, output)
-        if context.tag_disabled?(tag_name)
-          output << disabled_error(context)
-          return
-        end
-        super
-      end
-
-      def disabled_error(context)
-        # raise then rescue the exception so that the Context#exception_renderer can re-raise it
-        raise DisabledError, "#{tag_name} #{parse_context[:locale].t('errors.disabled.tag')}"
-      rescue DisabledError => exc
-        context.handle_error(exc, line_number)
-      end
-    end
-  end
-end

lib/liquid/tag/disabler.rb

@@ -1,21 +0,0 @@
-# frozen_string_literal: true
-
-module Liquid
-  class Tag
-    module Disabler
-      module ClassMethods
-        attr_reader :disabled_tags
-      end
-
-      def self.prepended(base)
-        base.extend(ClassMethods)
-      end
-
-      def render_to_output_buffer(context, output)
-        context.with_disabled_tags(self.class.disabled_tags) do
-          super
-        end
-      end
-    end
-  end
-end

lib/liquid/tags/assign.rb

@@ -12,6 +12,10 @@ module Liquid
   class Assign < Tag
     Syntax = /(#{VariableSignature}+)\s*=\s*(.*)\s*/om
 
+    def self.syntax_error_translation_key
+      "errors.syntax.assign"
+    end
+
     attr_reader :to, :from
 
     def initialize(tag_name, markup, options)
@@ -20,14 +24,14 @@ module Liquid
         @to   = Regexp.last_match(1)
         @from = Variable.new(Regexp.last_match(2), options)
       else
-        raise SyntaxError, options[:locale].t('errors.syntax.assign')
+        raise SyntaxError, options[:locale].t(self.class.syntax_error_translation_key)
       end
     end
 
     def render_to_output_buffer(context, output)
       val = @from.render(context)
       context.scopes.last[@to] = val
-      context.resource_limits.increment_assign_score(assign_score_of(val))
+      context.resource_limits.assign_score += assign_score_of(val)
       output
     end
 

lib/liquid/tags/break.rb

@@ -11,11 +11,8 @@ module Liquid
   #    {% endfor %}
   #
   class Break < Tag
-    INTERRUPT = BreakInterrupt.new.freeze
-
-    def render_to_output_buffer(context, output)
-      context.push_interrupt(INTERRUPT)
-      output
+    def interrupt
+      BreakInterrupt.new
     end
   end
 

lib/liquid/tags/capture.rb

@@ -25,10 +25,10 @@ module Liquid
     end
 
     def render_to_output_buffer(context, output)
-      context.resource_limits.with_capture do
-        capture_output = render(context)
-        context.scopes.last[@to] = capture_output
-      end
+      previous_output_size = output.bytesize
+      super
+      context.scopes.last[@to] = output
+      context.resource_limits.assign_score += (output.bytesize - previous_output_size)
       output
     end
 

lib/liquid/tags/case.rb

@@ -19,11 +19,8 @@ module Liquid
     end
 
     def parse(tokens)
-      body = new_body
+      body = BlockBody.new
       body = @blocks.last.attachment while parse_body(body, tokens)
-      if blank?
-        @blocks.each { |condition| condition.attachment.remove_blank_strings }
-      end
     end
 
     def nodelist
@@ -59,7 +56,7 @@ module Liquid
     private
 
     def record_when_condition(markup)
-      body = new_body
+      body = BlockBody.new
 
       while markup
         unless markup =~ WhenSyntax
@@ -80,7 +77,7 @@ module Liquid
       end
 
       block = ElseCondition.new
-      block.attach(new_body)
+      block.attach(BlockBody.new)
       @blocks << block
     end
 

lib/liquid/tags/continue.rb

@@ -11,11 +11,8 @@ module Liquid
   #    {% endfor %}
   #
   class Continue < Tag
-    INTERRUPT = ContinueInterrupt.new.freeze
-
-    def render_to_output_buffer(context, output)
-      context.push_interrupt(INTERRUPT)
-      output
+    def interrupt
+      ContinueInterrupt.new
     end
   end
 

lib/liquid/tags/for.rb

@@ -54,18 +54,13 @@ module Liquid
       super
       @from = @limit = nil
       parse_with_selected_parser(markup)
-      @for_block = new_body
+      @for_block = BlockBody.new
       @else_block = nil
     end
 
     def parse(tokens)
-      if parse_body(@for_block, tokens)
-        parse_body(@else_block, tokens)
-      end
-      if blank?
-        @for_block.remove_blank_strings
-        @else_block&.remove_blank_strings
-      end
+      return unless parse_body(@for_block, tokens)
+      parse_body(@else_block, tokens)
     end
 
     def nodelist
@@ -74,7 +69,7 @@ module Liquid
 
     def unknown_tag(tag, markup, tokens)
       return super unless tag == 'else'
-      @else_block = new_body
+      @else_block = BlockBody.new
     end
 
     def render_to_output_buffer(context, output)

lib/liquid/tags/if.rb

@@ -31,9 +31,6 @@ module Liquid
     def parse(tokens)
       while parse_body(@blocks.last.attachment, tokens)
       end
-      if blank?
-        @blocks.each { |condition| condition.attachment.remove_blank_strings }
-      end
     end
 
     def unknown_tag(tag, markup, tokens)
@@ -64,7 +61,7 @@ module Liquid
       end
 
       @blocks.push(block)
-      block.attach(new_body)
+      block.attach(BlockBody.new)
     end
 
     def lax_parse(markup)

lib/liquid/tags/include.rb

@@ -16,8 +16,6 @@ module Liquid
   #   {% include 'product' for products %}
   #
   class Include < Tag
-    prepend Tag::Disableable
-
     SYNTAX = /(#{QuotedFragment}+)(\s+(?:with|for)\s+(#{QuotedFragment}+))?(\s+(?:as)\s+(#{VariableSegment}+))?/o
     Syntax = SYNTAX
 

lib/liquid/template.rb

@@ -64,6 +64,23 @@ module Liquid
       attr_accessor :error_mode
       Template.error_mode = :lax
 
+      attr_reader :taint_mode
+
+      # Sets how strict the taint checker should be.
+      # :lax is the default, and ignores the taint flag completely
+      # :warn adds a warning, but does not interrupt the rendering
+      # :error raises an error when tainted output is used
+      # @deprecated Since it is being deprecated in ruby itself.
+      def taint_mode=(mode)
+        taint_supported = Object.new.taint.tainted?
+        if mode != :lax && !taint_supported
+          raise NotImplementedError, "#{RUBY_ENGINE} #{RUBY_VERSION} doesn't support taint checking"
+        end
+        @taint_mode = mode
+      end
+
+      Template.taint_mode = :lax
+
       attr_accessor :default_exception_renderer
       Template.default_exception_renderer = lambda do |exception|
         exception
@@ -80,6 +97,14 @@ module Liquid
         tags[name.to_s] = klass
       end
 
+      attr_accessor :registers
+      Template.registers = {}
+      private :registers=
+
+      def add_register(name, klass)
+        registers[name.to_sym] = klass
+      end
+
       # Pass a module with filter methods which should be available
       # to all liquid views. Good for registering the standard library
       def register_filter(mod)
@@ -94,13 +119,14 @@ module Liquid
       # To enable profiling, pass in <tt>profile: true</tt> as an option.
       # See Liquid::Profiler for more information
       def parse(source, options = {})
-        new.parse(source, options)
+        template = Template.new
+        template.parse(source, options)
       end
     end
 
     def initialize
       @rethrow_errors  = false
-      @resource_limits = ResourceLimits.new(Template.default_resource_limits)
+      @resource_limits = ResourceLimits.new(self.class.default_resource_limits)
     end
 
     # Parse source code.
@@ -186,6 +212,10 @@ module Liquid
         context.add_filters(args.pop)
       end
 
+      Template.registers.each do |key, register|
+        context_register[key] = register
+      end
+
       # Retrying a render resets resource usage
       context.resource_limits.reset
 

lib/liquid/variable.rb

@@ -86,7 +86,9 @@ module Liquid
         context.invoke(filter_name, output, *filter_args)
       end
 
-      context.apply_global_filter(obj)
+      obj = context.apply_global_filter(obj)
+      taint_check(context, obj)
+      obj
     end
 
     def render_to_output_buffer(context, output)
@@ -140,6 +142,25 @@ module Liquid
       parsed_args
     end
 
+    def taint_check(context, obj)
+      return if Template.taint_mode == :lax
+      return unless obj.tainted?
+
+      @markup =~ QuotedFragment
+      name = Regexp.last_match(0)
+
+      error               = TaintedError.new("variable '#{name}' is tainted and was not escaped")
+      error.line_number   = line_number
+      error.template_name = context.template_name
+
+      case Template.taint_mode
+      when :warn
+        context.warnings << error
+      when :error
+        raise error
+      end
+    end
+
     class ParseTreeVisitor < Liquid::ParseTreeVisitor
       def children
         [@node.name] + @node.filters.flatten

liquid.gemspec

@@ -27,6 +27,6 @@ Gem::Specification.new do |s|
 
   s.require_path = "lib"
 
-  s.add_development_dependency('rake', '~> 13.0')
+  s.add_development_dependency('rake', '~> 11.3')
   s.add_development_dependency('minitest')
 end

test/integration/drop_test.rb

@@ -49,6 +49,10 @@ class ProductDrop < Liquid::Drop
     ContextDrop.new
   end
 
+  def user_input
+    (+"foo").taint
+  end
+
   protected
 
   def callmenot
@@ -110,6 +114,34 @@ class DropsTest < Minitest::Test
     assert_equal('  ', tpl.render!('product' => ProductDrop.new))
   end
 
+  if taint_supported?
+    def test_rendering_raises_on_tainted_attr
+      with_taint_mode(:error) do
+        tpl = Liquid::Template.parse('{{ product.user_input }}')
+        assert_raises TaintedError do
+          tpl.render!('product' => ProductDrop.new)
+        end
+      end
+    end
+
+    def test_rendering_warns_on_tainted_attr
+      with_taint_mode(:warn) do
+        tpl     = Liquid::Template.parse('{{ product.user_input }}')
+        context = Context.new('product' => ProductDrop.new)
+        tpl.render!(context)
+        assert_equal [Liquid::TaintedError], context.warnings.map(&:class)
+        assert_equal "variable 'product.user_input' is tainted and was not escaped", context.warnings.first.to_s(false)
+      end
+    end
+
+    def test_rendering_doesnt_raise_on_escaped_tainted_attr
+      with_taint_mode(:error) do
+        tpl = Liquid::Template.parse('{{ product.user_input | escape }}')
+        tpl.render!('product' => ProductDrop.new)
+      end
+    end
+  end
+
   def test_drop_does_only_respond_to_whitelisted_methods
     assert_equal("", Liquid::Template.parse("{{ product.inspect }}").render!('product' => ProductDrop.new))
     assert_equal("", Liquid::Template.parse("{{ product.pretty_inspect }}").render!('product' => ProductDrop.new))
@@ -249,7 +281,7 @@ class DropsTest < Minitest::Test
   end
 
   def test_invokable_methods
-    assert_equal(%w(to_liquid catchall context texts).to_set, ProductDrop.invokable_methods)
+    assert_equal(%w(to_liquid catchall user_input context texts).to_set, ProductDrop.invokable_methods)
     assert_equal(%w(to_liquid scopes_as_array loop_pos scopes).to_set, ContextDrop.invokable_methods)
     assert_equal(%w(to_liquid size max min first count).to_set, EnumerableDrop.invokable_methods)
     assert_equal(%w(to_liquid max min sort count first).to_set, RealEnumerableDrop.invokable_methods)

test/integration/parse_tree_visitor_test.rb

@@ -238,7 +238,7 @@ class ParseTreeVisitorTest < Minitest::Test
   def traversal(template)
     ParseTreeVisitor
       .for(Template.parse(template).root)
-      .add_callback_for(VariableLookup) { |node| node.name } # rubocop:disable Style/SymbolProc
+      .add_callback_for(VariableLookup, &:name)
   end
 
   def visit(template)

test/integration/registers/disabled_tags_test.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class DisabledTagsTest < Minitest::Test
+  include Liquid
+
+  class DisableRaw < Block
+    disable_tags "raw"
+  end
+
+  class DisableRawEcho < Block
+    disable_tags "raw", "echo"
+  end
+
+  def test_disables_raw
+    with_custom_tag('disable', DisableRaw) do
+      assert_template_result 'raw usage is not allowed in this contextfoo', '{% disable %}{% raw %}Foobar{% endraw %}{% echo "foo" %}{% enddisable %}'
+    end
+  end
+
+  def test_disables_echo_and_raw
+    with_custom_tag('disable', DisableRawEcho) do
+      assert_template_result 'raw usage is not allowed in this contextecho usage is not allowed in this context', '{% disable %}{% raw %}Foobar{% endraw %}{% echo "foo" %}{% enddisable %}'
+    end
+  end
+end

test/integration/tag/disableable_test.rb

@@ -1,51 +0,0 @@
-# frozen_string_literal: true
-
-require 'test_helper'
-
-class TagDisableableTest < Minitest::Test
-  include Liquid
-
-  class DisableRaw < Block
-    disable_tags "raw"
-  end
-
-  class DisableRawEcho < Block
-    disable_tags "raw", "echo"
-  end
-
-  class DisableableRaw < Liquid::Raw
-    prepend Liquid::Tag::Disableable
-  end
-
-  class DisableableEcho < Liquid::Echo
-    prepend Liquid::Tag::Disableable
-  end
-
-  def test_disables_raw
-    with_disableable_tags do
-      with_custom_tag('disable', DisableRaw) do
-        output = Template.parse('{% disable %}{% raw %}Foobar{% endraw %}{% echo "foo" %}{% enddisable %}').render
-        assert_equal('Liquid error: raw usage is not allowed in this contextfoo', output)
-      end
-    end
-  end
-
-  def test_disables_echo_and_raw
-    with_disableable_tags do
-      with_custom_tag('disable', DisableRawEcho) do
-        output = Template.parse('{% disable %}{% raw %}Foobar{% endraw %}{% echo "foo" %}{% enddisable %}').render
-        assert_equal('Liquid error: raw usage is not allowed in this contextLiquid error: echo usage is not allowed in this context', output)
-      end
-    end
-  end
-
-  private
-
-  def with_disableable_tags
-    with_custom_tag('raw', DisableableRaw) do
-      with_custom_tag('echo', DisableableEcho) do
-        yield
-      end
-    end
-  end
-end

test/integration/tags/liquid_tag_test.rb

@@ -82,13 +82,15 @@ class LiquidTagTest < Minitest::Test
   end
 
   def test_nested_liquid_tag
-    assert_template_result('good', <<~LIQUID)
-      {%- if true %}
-        {%- liquid
-          echo "good"
-        %}
-      {%- endif -%}
-    LIQUID
+    assert_usage_increment("liquid_tag_contains_outer_tag", times: 0) do
+      assert_template_result('good', <<~LIQUID)
+        {%- if true %}
+          {%- liquid
+            echo "good"
+          %}
+        {%- endif -%}
+      LIQUID
+    end
   end
 
   def test_cannot_open_blocks_living_past_a_liquid_tag
@@ -100,12 +102,14 @@ class LiquidTagTest < Minitest::Test
     LIQUID
   end
 
-  def test_cannot_close_blocks_created_before_a_liquid_tag
-    assert_match_syntax_error("syntax error (line 3): 'endif' is not a valid delimiter for liquid tags. use %}", <<~LIQUID)
-      {%- if true -%}
-      42
-      {%- liquid endif -%}
-    LIQUID
+  def test_quirk_can_close_blocks_created_before_a_liquid_tag
+    assert_usage_increment("liquid_tag_contains_outer_tag") do
+      assert_template_result("42", <<~LIQUID)
+        {%- if true -%}
+        42
+        {%- liquid endif -%}
+      LIQUID
+    end
   end
 
   def test_liquid_tag_in_raw

test/integration/tags/render_tag_test.rb

@@ -42,6 +42,34 @@ class RenderTagTest < Minitest::Test
     assert_template_result('', "{% assign snippet = 'should not be visible' %}{% render 'snippet' %}")
   end
 
+  if taint_supported?
+    def test_render_sets_the_correct_template_name_for_errors
+      Liquid::Template.file_system = StubFileSystem.new('snippet' => '{{ unsafe }}')
+
+      with_taint_mode :error do
+        template = Liquid::Template.parse('{% render "snippet", unsafe: unsafe %}')
+        context  = Context.new('unsafe' => (+'unsafe').tap(&:taint))
+        template.render(context)
+
+        assert_equal [Liquid::TaintedError], template.errors.map(&:class)
+        assert_equal 'snippet', template.errors.first.template_name
+      end
+    end
+
+    def test_render_sets_the_correct_template_name_for_warnings
+      Liquid::Template.file_system = StubFileSystem.new('snippet' => '{{ unsafe }}')
+
+      with_taint_mode :warn do
+        template = Liquid::Template.parse('{% render "snippet", unsafe: unsafe %}')
+        context  = Context.new('unsafe' => (+'unsafe').tap(&:taint))
+        template.render(context)
+
+        assert_equal [Liquid::TaintedError], context.warnings.map(&:class)
+        assert_equal 'snippet', context.warnings.first.template_name
+      end
+    end
+  end
+
   def test_render_does_not_mutate_parent_scope
     Liquid::Template.file_system = StubFileSystem.new('snippet' => '{% assign inner = 1 %}')
     assert_template_result('', "{% render 'snippet' %}{{ inner }}")
@@ -127,10 +155,7 @@ class RenderTagTest < Minitest::Test
       'test_include' => '{% include "foo" %}'
     )
 
-    exc = assert_raises(Liquid::DisabledError) do
-      Liquid::Template.parse('{% render "test_include" %}').render!
-    end
-    assert_equal('Liquid error: include usage is not allowed in this context', exc.message)
+    assert_template_result('include usage is not allowed in this context', '{% render "test_include" %}')
   end
 
   def test_includes_will_not_render_inside_nested_sibling_tags
@@ -140,8 +165,7 @@ class RenderTagTest < Minitest::Test
       'test_include' => '{% include "foo" %}'
     )
 
-    output = Liquid::Template.parse('{% render "nested_render_with_sibling_include" %}').render
-    assert_equal('Liquid error: include usage is not allowed in this contextLiquid error: include usage is not allowed in this context', output)
+    assert_template_result('include usage is not allowed in this contextinclude usage is not allowed in this context', '{% render "nested_render_with_sibling_include" %}')
   end
 
   def test_render_tag_with

test/integration/template_test.rb

@@ -111,12 +111,13 @@ class TemplateTest < Minitest::Test
 
   def test_resource_limits_render_length
     t = Template.parse("0123456789")
-    t.resource_limits.render_length_limit = 9
+    t.resource_limits.render_length_limit = 5
     assert_equal("Liquid error: Memory limits exceeded", t.render)
     assert(t.resource_limits.reached?)
 
     t.resource_limits.render_length_limit = 10
     assert_equal("0123456789", t.render!)
+    refute_nil(t.resource_limits.render_length)
   end
 
   def test_resource_limits_render_score
@@ -175,46 +176,50 @@ class TemplateTest < Minitest::Test
   end
 
   def test_resource_limits_hash_in_template_gets_updated_even_if_no_limits_are_set
-    t = Template.parse("{% for a in (1..100) %}x{% assign foo = 1 %} {% endfor %}")
+    t = Template.parse("{% for a in (1..100) %} {% assign foo = 1 %} {% endfor %}")
     t.render!
     assert(t.resource_limits.assign_score > 0)
     assert(t.resource_limits.render_score > 0)
+    assert(t.resource_limits.render_length > 0)
   end
 
   def test_render_length_persists_between_blocks
     t = Template.parse("{% if true %}aaaa{% endif %}")
-    t.resource_limits.render_length_limit = 3
+    t.resource_limits.render_length_limit = 7
     assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 4
+    t.resource_limits.render_length_limit = 8
     assert_equal("aaaa", t.render)
 
     t = Template.parse("{% if true %}aaaa{% endif %}{% if true %}bbb{% endif %}")
-    t.resource_limits.render_length_limit = 6
+    t.resource_limits.render_length_limit = 13
     assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 7
+    t.resource_limits.render_length_limit = 14
     assert_equal("aaaabbb", t.render)
 
     t = Template.parse("{% if true %}a{% endif %}{% if true %}b{% endif %}{% if true %}a{% endif %}{% if true %}b{% endif %}{% if true %}a{% endif %}{% if true %}b{% endif %}")
     t.resource_limits.render_length_limit = 5
     assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 6
+    t.resource_limits.render_length_limit = 11
+    assert_equal("Liquid error: Memory limits exceeded", t.render)
+    t.resource_limits.render_length_limit = 12
     assert_equal("ababab", t.render)
   end
 
   def test_render_length_uses_number_of_bytes_not_characters
     t = Template.parse("{% if true %}すごい{% endif %}")
-    t.resource_limits.render_length_limit = 8
+    t.resource_limits.render_length_limit = 10
     assert_equal("Liquid error: Memory limits exceeded", t.render)
-    t.resource_limits.render_length_limit = 9
+    t.resource_limits.render_length_limit = 18
     assert_equal("すごい", t.render)
   end
 
   def test_default_resource_limits_unaffected_by_render_with_context
     context = Context.new
-    t = Template.parse("{% for a in (1..100) %}x{% assign foo = 1 %} {% endfor %}")
+    t = Template.parse("{% for a in (1..100) %} {% assign foo = 1 %} {% endfor %}")
     t.render!(context)
     assert(context.resource_limits.assign_score > 0)
     assert(context.resource_limits.render_score > 0)
+    assert(context.resource_limits.render_length > 0)
   end
 
   def test_can_use_drop_as_context
@@ -356,4 +361,12 @@ class TemplateTest < Minitest::Test
     result = t.render('x' => 1, 'y' => 5)
     assert_equal('12345', result)
   end
+
+  unless taint_supported?
+    def test_taint_mode
+      assert_raises(NotImplementedError) do
+        Template.taint_mode = :warn
+      end
+    end
+  end
 end

test/integration/trim_mode_test.rb

@@ -528,21 +528,4 @@ class TrimModeTest < Minitest::Test
     END_EXPECTED
     assert_template_result(expected, text)
   end
-
-  def test_bug_compatible_pre_trim
-    template = Liquid::Template.parse("\n {%- raw %}{% endraw %}", bug_compatible_whitespace_trimming: true)
-    assert_equal("\n", template.render)
-
-    template = Liquid::Template.parse("\n {%- if true %}{% endif %}", bug_compatible_whitespace_trimming: true)
-    assert_equal("\n", template.render)
-
-    template = Liquid::Template.parse("{{ 'B' }} \n{%- if true %}C{% endif %}", bug_compatible_whitespace_trimming: true)
-    assert_equal("B C", template.render)
-
-    template = Liquid::Template.parse("B\n {%- raw %}{% endraw %}", bug_compatible_whitespace_trimming: true)
-    assert_equal("B", template.render)
-
-    template = Liquid::Template.parse("B\n {%- if true %}{% endif %}", bug_compatible_whitespace_trimming: true)
-    assert_equal("B", template.render)
-  end
 end # TrimModeTest

test/test_helper.rb

@@ -32,6 +32,10 @@ module Minitest
     def fixture(name)
       File.join(File.expand_path(__dir__), "fixtures", name)
     end
+
+    def self.taint_supported?
+      Object.new.taint.tainted?
+    end
   end
 
   module Assertions
@@ -89,6 +93,14 @@ module Minitest
       Liquid::StrainerFactory.instance_variable_set(:@global_filters, original_global_filters)
     end
 
+    def with_taint_mode(mode)
+      old_mode = Liquid::Template.taint_mode
+      Liquid::Template.taint_mode = mode
+      yield
+    ensure
+      Liquid::Template.taint_mode = old_mode
+    end
+
     def with_error_mode(mode)
       old_mode = Liquid::Template.error_mode
       Liquid::Template.error_mode = mode
@@ -98,17 +110,10 @@ module Minitest
     end
 
     def with_custom_tag(tag_name, tag_class)
-      old_tag = Liquid::Template.tags[tag_name]
-      begin
-        Liquid::Template.register_tag(tag_name, tag_class)
-        yield
-      ensure
-        if old_tag
-          Liquid::Template.tags[tag_name] = old_tag
-        else
-          Liquid::Template.tags.delete(tag_name)
-        end
-      end
+      Liquid::Template.register_tag(tag_name, tag_class)
+      yield
+    ensure
+      Liquid::Template.tags.delete(tag_name)
     end
   end
 end

test/unit/context_unit_test.rb

@@ -147,13 +147,13 @@ class ContextUnitTest < Minitest::Test
 
     context = Context.new
     context.add_filters(filter)
-    assert_equal('hi? hi!', context.invoke(:hi, 'hi?'))
+    assert_equal('hi? hi!', context.invoke('hi', 'hi?'))
 
     context = Context.new
-    assert_equal('hi?', context.invoke(:hi, 'hi?'))
+    assert_equal('hi?', context.invoke('hi', 'hi?'))
 
     context.add_filters(filter)
-    assert_equal('hi? hi!', context.invoke(:hi, 'hi?'))
+    assert_equal('hi? hi!', context.invoke('hi', 'hi?'))
   end
 
   def test_only_intended_filters_make_it_there
@@ -563,35 +563,6 @@ class ContextUnitTest < Minitest::Test
     assert_equal('my filter result', template.render(subcontext))
   end
 
-  def test_disables_tag_specified
-    context = Context.new
-    context.with_disabled_tags(%w(foo bar)) do
-      assert_equal true, context.tag_disabled?("foo")
-      assert_equal true, context.tag_disabled?("bar")
-      assert_equal false, context.tag_disabled?("unknown")
-    end
-  end
-
-  def test_disables_nested_tags
-    context = Context.new
-    context.with_disabled_tags(["foo"]) do
-      context.with_disabled_tags(["foo"]) do
-        assert_equal true, context.tag_disabled?("foo")
-        assert_equal false, context.tag_disabled?("bar")
-      end
-      context.with_disabled_tags(["bar"]) do
-        assert_equal true, context.tag_disabled?("foo")
-        assert_equal true, context.tag_disabled?("bar")
-        context.with_disabled_tags(["foo"]) do
-          assert_equal true, context.tag_disabled?("foo")
-          assert_equal true, context.tag_disabled?("bar")
-        end
-      end
-      assert_equal true, context.tag_disabled?("foo")
-      assert_equal false, context.tag_disabled?("bar")
-    end
-  end
-
   private
 
   def assert_no_object_allocations

test/unit/registers/disabled_tags_unit_test.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+class DisabledTagsUnitTest < Minitest::Test
+  include Liquid
+
+  def test_disables_tag_specified
+    register = DisabledTags.new
+    register.disable(%w(foo bar)) do
+      assert_equal true, register.disabled?("foo")
+      assert_equal true, register.disabled?("bar")
+      assert_equal false, register.disabled?("unknown")
+    end
+  end
+
+  def test_disables_nested_tags
+    register = DisabledTags.new
+    register.disable(["foo"]) do
+      register.disable(["foo"]) do
+        assert_equal true, register.disabled?("foo")
+        assert_equal false, register.disabled?("bar")
+      end
+      register.disable(["bar"]) do
+        assert_equal true, register.disabled?("foo")
+        assert_equal true, register.disabled?("bar")
+        register.disable(["foo"]) do
+          assert_equal true, register.disabled?("foo")
+          assert_equal true, register.disabled?("bar")
+        end
+      end
+      assert_equal true, register.disabled?("foo")
+      assert_equal false, register.disabled?("bar")
+    end
+  end
+end

test/unit/static_registers_unit_test.rb

@@ -5,152 +5,244 @@ require 'test_helper'
 class StaticRegistersUnitTest < Minitest::Test
   include Liquid
 
-  def test_set
-    static_register = StaticRegisters.new(a: 1, b: 2)
-    static_register[:b] = 22
-    static_register[:c] = 33
+  def set
+    static_register        = StaticRegisters.new
+    static_register[nil]   = true
+    static_register[1]     = :one
+    static_register[:one]  = "one"
+    static_register["two"] = "three"
+    static_register["two"] = 3
+    static_register[false] = nil
 
-    assert_equal(1, static_register[:a])
-    assert_equal(22, static_register[:b])
-    assert_equal(33, static_register[:c])
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.registers)
+
+    static_register
   end
 
-  def test_get_missing_key
-    static_register = StaticRegisters.new
+  def test_get
+    static_register = set
 
-    assert_nil(static_register[:missing])
+    assert_equal(true, static_register[nil])
+    assert_equal(:one, static_register[1])
+    assert_equal("one", static_register[:one])
+    assert_equal(3, static_register["two"])
+    assert_nil(static_register[false])
+    assert_nil(static_register["unknown"])
   end
 
   def test_delete
-    static_register = StaticRegisters.new(a: 1, b: 2)
-    static_register[:b] = 22
-    static_register[:c] = 33
+    static_register = set
 
-    assert_nil(static_register.delete(:a))
+    assert_equal(true, static_register.delete(nil))
+    assert_equal(:one, static_register.delete(1))
+    assert_equal("one", static_register.delete(:one))
+    assert_equal(3, static_register.delete("two"))
+    assert_nil(static_register.delete(false))
+    assert_nil(static_register.delete("unknown"))
 
-    assert_equal(22, static_register.delete(:b))
-
-    assert_equal(33, static_register.delete(:c))
-    assert_nil(static_register[:c])
-
-    assert_nil(static_register.delete(:d))
+    assert_equal({}, static_register.registers)
   end
 
   def test_fetch
-    static_register = StaticRegisters.new(a: 1, b: 2)
-    static_register[:b] = 22
-    static_register[:c] = 33
+    static_register = set
 
-    assert_equal(1, static_register.fetch(:a))
-    assert_equal(1, static_register.fetch(:a, "default"))
-    assert_equal(22, static_register.fetch(:b))
-    assert_equal(22, static_register.fetch(:b, "default"))
-    assert_equal(33, static_register.fetch(:c))
-    assert_equal(33, static_register.fetch(:c, "default"))
+    assert_equal(true, static_register.fetch(nil))
+    assert_equal(:one, static_register.fetch(1))
+    assert_equal("one", static_register.fetch(:one))
+    assert_equal(3, static_register.fetch("two"))
+    assert_nil(static_register.fetch(false))
+    assert_nil(static_register.fetch("unknown"))
+  end
 
-    assert_raises(KeyError) do
-      static_register.fetch(:d)
-    end
-    assert_equal("default", static_register.fetch(:d, "default"))
+  def test_fetch_default
+    static_register = StaticRegisters.new
 
-    result = static_register.fetch(:d) { "default" }
-    assert_equal("default", result)
-
-    result = static_register.fetch(:d, "default 1") { "default 2" }
-    assert_equal("default 2", result)
+    assert_equal(true, static_register.fetch(nil, true))
+    assert_equal(:one, static_register.fetch(1, :one))
+    assert_equal("one", static_register.fetch(:one, "one"))
+    assert_equal(3, static_register.fetch("two", 3))
+    assert_nil(static_register.fetch(false, nil))
   end
 
   def test_key
-    static_register = StaticRegisters.new(a: 1, b: 2)
-    static_register[:b] = 22
-    static_register[:c] = 33
+    static_register = set
 
-    assert_equal(true, static_register.key?(:a))
-    assert_equal(true, static_register.key?(:b))
-    assert_equal(true, static_register.key?(:c))
-    assert_equal(false, static_register.key?(:d))
+    assert_equal(true, static_register.key?(nil))
+    assert_equal(true, static_register.key?(1))
+    assert_equal(true, static_register.key?(:one))
+    assert_equal(true, static_register.key?("two"))
+    assert_equal(true, static_register.key?(false))
+    assert_equal(false, static_register.key?("unknown"))
+    assert_equal(false, static_register.key?(true))
+  end
+
+  def set_with_static
+    static_register        = StaticRegisters.new(nil => true, 1 => :one, :one => "one", "two" => 3, false => nil)
+    static_register[nil]   = false
+    static_register["two"] = 4
+    static_register[true]  = "foo"
+
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
+    assert_equal({ nil => false, "two" => 4, true => "foo" }, static_register.registers)
+
+    static_register
+  end
+
+  def test_get_with_static
+    static_register = set_with_static
+
+    assert_equal(false, static_register[nil])
+    assert_equal(:one, static_register[1])
+    assert_equal("one", static_register[:one])
+    assert_equal(4, static_register["two"])
+    assert_equal("foo", static_register[true])
+    assert_nil(static_register[false])
+  end
+
+  def test_delete_with_static
+    static_register = set_with_static
+
+    assert_equal(false, static_register.delete(nil))
+    assert_equal(4, static_register.delete("two"))
+    assert_equal("foo", static_register.delete(true))
+    assert_nil(static_register.delete("unknown"))
+    assert_nil(static_register.delete(:one))
+
+    assert_equal({}, static_register.registers)
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
+  end
+
+  def test_fetch_with_static
+    static_register = set_with_static
+
+    assert_equal(false, static_register.fetch(nil))
+    assert_equal(:one, static_register.fetch(1))
+    assert_equal("one", static_register.fetch(:one))
+    assert_equal(4, static_register.fetch("two"))
+    assert_equal("foo", static_register.fetch(true))
+    assert_nil(static_register.fetch(false))
+  end
+
+  def test_key_with_static
+    static_register = set_with_static
+
+    assert_equal(true, static_register.key?(nil))
+    assert_equal(true, static_register.key?(1))
+    assert_equal(true, static_register.key?(:one))
+    assert_equal(true, static_register.key?("two"))
+    assert_equal(true, static_register.key?(false))
+    assert_equal(false, static_register.key?("unknown"))
+    assert_equal(true, static_register.key?(true))
   end
 
   def test_static_register_can_be_frozen
-    static_register = StaticRegisters.new(a: 1)
+    static_register = set_with_static
 
-    static_register.static.freeze
+    static = static_register.static.freeze
 
     assert_raises(RuntimeError) do
-      static_register.static[:a] = "foo"
+      static["two"] = "foo"
     end
 
     assert_raises(RuntimeError) do
-      static_register.static[:b] = "foo"
+      static["unknown"] = "foo"
     end
 
     assert_raises(RuntimeError) do
-      static_register.static.delete(:a)
-    end
-
-    assert_raises(RuntimeError) do
-      static_register.static.delete(:c)
+      static.delete("two")
     end
   end
 
   def test_new_static_retains_static
-    static_register = StaticRegisters.new(a: 1, b: 2)
-    static_register[:b] = 22
-    static_register[:c] = 33
+    static_register          = StaticRegisters.new(nil => true, 1 => :one, :one => "one", "two" => 3, false => nil)
+    static_register["one"]   = 1
+    static_register["two"]   = 2
+    static_register["three"] = 3
 
-    new_static_register = StaticRegisters.new(static_register)
-    new_static_register[:b] = 222
+    new_register = StaticRegisters.new(static_register)
+    assert_equal({}, new_register.registers)
 
-    newest_static_register = StaticRegisters.new(new_static_register)
-    newest_static_register[:c] = 333
+    new_register["one"]   = 4
+    new_register["two"]   = 5
+    new_register["three"] = 6
 
-    assert_equal(1, static_register[:a])
-    assert_equal(22, static_register[:b])
-    assert_equal(33, static_register[:c])
+    newest_register = StaticRegisters.new(new_register)
+    assert_equal({}, newest_register.registers)
 
-    assert_equal(1, new_static_register[:a])
-    assert_equal(222, new_static_register[:b])
-    assert_nil(new_static_register[:c])
+    newest_register["one"]   = 7
+    newest_register["two"]   = 8
+    newest_register["three"] = 9
 
-    assert_equal(1, newest_static_register[:a])
-    assert_equal(2, newest_static_register[:b])
-    assert_equal(333, newest_static_register[:c])
+    assert_equal({ "one" => 1, "two" => 2, "three" => 3 }, static_register.registers)
+    assert_equal({ "one" => 4, "two" => 5, "three" => 6 }, new_register.registers)
+    assert_equal({ "one" => 7, "two" => 8, "three" => 9 }, newest_register.registers)
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, new_register.static)
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, newest_register.static)
   end
 
   def test_multiple_instances_are_unique
-    static_register_1 = StaticRegisters.new(a: 1, b: 2)
-    static_register_1[:b] = 22
-    static_register_1[:c] = 33
+    static_register          = StaticRegisters.new(nil => true, 1 => :one, :one => "one", "two" => 3, false => nil)
+    static_register["one"]   = 1
+    static_register["two"]   = 2
+    static_register["three"] = 3
 
-    static_register_2 = StaticRegisters.new(a: 10, b: 20)
-    static_register_2[:b] = 220
-    static_register_2[:c] = 330
+    new_register = StaticRegisters.new(foo: :bar)
+    assert_equal({}, new_register.registers)
 
-    assert_equal({ a: 1, b: 2 }, static_register_1.static)
-    assert_equal(1, static_register_1[:a])
-    assert_equal(22, static_register_1[:b])
-    assert_equal(33, static_register_1[:c])
+    new_register["one"]   = 4
+    new_register["two"]   = 5
+    new_register["three"] = 6
 
-    assert_equal({ a: 10, b: 20 }, static_register_2.static)
-    assert_equal(10, static_register_2[:a])
-    assert_equal(220, static_register_2[:b])
-    assert_equal(330, static_register_2[:c])
+    newest_register = StaticRegisters.new(bar: :foo)
+    assert_equal({}, newest_register.registers)
+
+    newest_register["one"]   = 7
+    newest_register["two"]   = 8
+    newest_register["three"] = 9
+
+    assert_equal({ "one" => 1, "two" => 2, "three" => 3 }, static_register.registers)
+    assert_equal({ "one" => 4, "two" => 5, "three" => 6 }, new_register.registers)
+    assert_equal({ "one" => 7, "two" => 8, "three" => 9 }, newest_register.registers)
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
+    assert_equal({ foo: :bar }, new_register.static)
+    assert_equal({ bar: :foo }, newest_register.static)
   end
 
-  def test_initialization_reused_static_same_memory_object
-    static_register_1 = StaticRegisters.new(a: 1, b: 2)
-    static_register_1[:b] = 22
-    static_register_1[:c] = 33
+  def test_can_update_static_directly_and_updates_all_instances
+    static_register          = StaticRegisters.new(nil => true, 1 => :one, :one => "one", "two" => 3, false => nil)
+    static_register["one"]   = 1
+    static_register["two"]   = 2
+    static_register["three"] = 3
 
-    static_register_2 = StaticRegisters.new(static_register_1)
+    new_register = StaticRegisters.new(static_register)
+    assert_equal({}, new_register.registers)
 
-    assert_equal(1, static_register_2[:a])
-    assert_equal(2, static_register_2[:b])
-    assert_nil(static_register_2[:c])
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
 
-    static_register_1.static[:b] = 222
-    static_register_1.static[:c] = 333
+    new_register["one"]         = 4
+    new_register["two"]         = 5
+    new_register["three"]       = 6
+    new_register.static["four"] = 10
 
-    assert_same(static_register_1.static, static_register_2.static)
+    newest_register = StaticRegisters.new(new_register)
+    assert_equal({}, newest_register.registers)
+
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil, "four" => 10 }, new_register.static)
+
+    newest_register["one"]      = 7
+    newest_register["two"]      = 8
+    newest_register["three"]    = 9
+    new_register.static["four"] = 5
+    new_register.static["five"] = 15
+
+    assert_equal({ "one" => 1, "two" => 2, "three" => 3 }, static_register.registers)
+    assert_equal({ "one" => 4, "two" => 5, "three" => 6 }, new_register.registers)
+    assert_equal({ "one" => 7, "two" => 8, "three" => 9 }, newest_register.registers)
+
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil, "four" => 5, "five" => 15 }, newest_register.static)
+
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil, "four" => 5, "five" => 15 }, static_register.static)
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil, "four" => 5, "five" => 15 }, new_register.static)
   end
 end

test/unit/strainer_factory_unit_test.rb

@@ -82,16 +82,6 @@ class StrainerFactoryUnitTest < Minitest::Test
     assert_equal("has_method?", strainer.invoke("invoke", "has_method?", "invoke"))
   end
 
-  def test_strainer_uses_a_class_cache_to_avoid_method_cache_invalidation
-    a = Module.new
-    b = Module.new
-    strainer = StrainerFactory.create(@context, [a, b])
-    assert_kind_of(StrainerTemplate, strainer)
-    assert_kind_of(a, strainer)
-    assert_kind_of(b, strainer)
-    assert_kind_of(Liquid::StandardFilters, strainer)
-  end
-
   def test_add_global_filter_clears_cache
     assert_equal('input', StrainerFactory.create(@context).invoke('late_added_filter', 'input'))
     StrainerFactory.add_global_filter(LateAddedFilter)

test/unit/strainer_template_unit_test.rb

@@ -10,73 +10,9 @@ class StrainerTemplateUnitTest < Minitest::Test
     s = c.strainer
     wrong_filter = ->(v) { v.reverse }
 
-    exception = assert_raises(TypeError) do
+    exception = assert_raises(ArgumentError) do
       s.class.add_filter(wrong_filter)
     end
-    assert_equal(exception.message, "wrong argument type Proc (expected Module)")
-  end
-
-  module PrivateMethodOverrideFilter
-    private
-
-    def public_filter
-      "overriden as private"
-    end
-  end
-
-  def test_add_filter_raises_when_module_privately_overrides_registered_public_methods
-    strainer = Context.new.strainer
-
-    error = assert_raises(Liquid::MethodOverrideError) do
-      strainer.class.add_filter(PrivateMethodOverrideFilter)
-    end
-    assert_equal('Liquid error: Filter overrides registered public methods as non public: public_filter', error.message)
-  end
-
-  module ProtectedMethodOverrideFilter
-    protected
-
-    def public_filter
-      "overriden as protected"
-    end
-  end
-
-  def test_add_filter_raises_when_module_overrides_registered_public_method_as_protected
-    strainer = Context.new.strainer
-
-    error = assert_raises(Liquid::MethodOverrideError) do
-      strainer.class.add_filter(ProtectedMethodOverrideFilter)
-    end
-    assert_equal('Liquid error: Filter overrides registered public methods as non public: public_filter', error.message)
-  end
-
-  module PublicMethodOverrideFilter
-    def public_filter
-      "public"
-    end
-  end
-
-  def test_add_filter_does_not_raise_when_module_overrides_previously_registered_method
-    strainer = Context.new.strainer
-    with_global_filter do
-      strainer.class.add_filter(PublicMethodOverrideFilter)
-      assert(strainer.class.send(:filter_methods).include?('public_filter'))
-    end
-  end
-
-  def test_add_filter_does_not_include_already_included_module
-    mod = Module.new do
-      class << self
-        attr_accessor :include_count
-        def included(_mod)
-          self.include_count += 1
-        end
-      end
-      self.include_count = 0
-    end
-    strainer = Context.new.strainer
-    strainer.class.add_filter(mod)
-    strainer.class.add_filter(mod)
-    assert_equal(1, mod.include_count)
+    assert_equal(exception.message, "Liquid error: wrong argument type Proc (expected Liquid::Filter)")
   end
 end

test/unit/template_unit_test.rb

@@ -77,11 +77,4 @@ class TemplateUnitTest < Minitest::Test
   ensure
     Template.tags.delete('fake')
   end
-
-  class TemplateSubclass < Liquid::Template
-  end
-
-  def test_template_inheritance
-    assert_equal("foo", TemplateSubclass.parse("foo").render)
-  end
 end