Fix array handling shortcut in disable_tags

* Use `Regexp#match?` when `MatchData` is not used

* Add `TargetRubyVersion: 2.4` to RuboCop config

.rubocop.yml

@@ -1,5 +1,5 @@
 inherit_from:
-  - https://shopify.github.io/ruby-style-guide/rubocop.yml
+  - 'https://shopify.github.io/ruby-style-guide/rubocop.yml'
   - .rubocop_todo.yml
 
 require: rubocop-performance
@@ -8,9 +8,10 @@ Performance:
   Enabled: true
 
 AllCops:
+  TargetRubyVersion: 2.4
   Exclude:
     - 'vendor/bundle/**/*'
-      
+
 Naming/MethodName:
   Exclude:
-    - 'example/server/liquid_servlet.rb'
+    - 'example/server/liquid_servlet.rb'

.travis.yml

@@ -7,8 +7,6 @@ rvm:
   - &latest_ruby 2.6
   - 2.7
   - ruby-head
-  - jruby-head
-  - truffleruby
 
 matrix:
   include:
@@ -17,8 +15,6 @@ matrix:
       name: Profiling Memory Usage
   allow_failures:
     - rvm: ruby-head
-    - rvm: jruby-head
-    - rvm: truffleruby
 
 branches:
   only:

lib/liquid.rb

@@ -78,8 +78,10 @@ require 'liquid/tokenizer'
 require 'liquid/parse_context'
 require 'liquid/partial_cache'
 require 'liquid/usage'
+require 'liquid/register'
 require 'liquid/static_registers'
 
 # 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_body.rb

@@ -154,7 +154,13 @@ module Liquid
     private
 
     def render_node(context, output, node)
-      node.render_to_output_buffer(context, output)
+      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
@@ -162,6 +168,11 @@ module Liquid
       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?

lib/liquid/file_system.rb

@@ -59,7 +59,7 @@ module Liquid
     end
 
     def full_path(template_path)
-      raise FileSystemError, "Illegal template name '#{template_path}'" unless template_path =~ %r{\A[^./][a-zA-Z0-9_/]+\z}
+      raise FileSystemError, "Illegal template name '#{template_path}'" unless %r{\A[^./][a-zA-Z0-9_/]+\z}.match?(template_path)
 
       full_path = if template_path.include?('/')
         File.join(root, File.dirname(template_path), @pattern % File.basename(template_path))

lib/liquid/locales/en.yml

@@ -25,3 +25,5 @@
       render: "Syntax error in tag 'render' - Template name must be a quoted string"
     argument:
       include: "Argument error in tag 'include' - Illegal template name"
+    disabled:
+      tag: "usage is not allowed in this context"

lib/liquid/register.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+module Liquid
+  class Register
+  end
+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/static_registers.rb

@@ -2,10 +2,10 @@
 
 module Liquid
   class StaticRegisters
-    attr_reader :static_registers, :registers
+    attr_reader :static, :registers
 
     def initialize(registers = {})
-      @static_registers = registers.is_a?(StaticRegisters) ? registers.static_registers : registers.freeze
+      @static = registers.is_a?(StaticRegisters) ? registers.static : registers
       @registers = {}
     end
 
@@ -17,7 +17,7 @@ module Liquid
       if @registers.key?(key)
         @registers[key]
       else
-        @static_registers[key]
+        @static[key]
       end
     end
 
@@ -30,7 +30,7 @@ module Liquid
     end
 
     def key?(key)
-      @registers.key?(key) || @static_registers.key?(key)
+      @registers.key?(key) || @static.key?(key)
     end
   end
 end

lib/liquid/tag.rb

@@ -13,7 +13,15 @@ module Liquid
         tag
       end
 
+      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)
@@ -38,6 +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.
@@ -49,5 +65,9 @@ module Liquid
     def blank?
       false
     end
+
+    def disabled_tags
+      self.class.disabled_tags
+    end
   end
 end

lib/liquid/tags/raw.rb

@@ -40,7 +40,7 @@ module Liquid
     protected
 
     def ensure_valid_markup(tag_name, markup, parse_context)
-      unless markup =~ Syntax
+      unless Syntax.match?(markup)
         raise SyntaxError, parse_context.locale.t("errors.syntax.tag_unexpected_args", tag: tag_name)
       end
     end

lib/liquid/tags/render.rb

@@ -4,6 +4,8 @@ module Liquid
   class Render < Tag
     SYNTAX = /(#{QuotedString})#{QuotedFragment}*/o
 
+    disable_tags "include"
+
     attr_reader :template_name_expr, :attributes
 
     def initialize(tag_name, markup, options)
@@ -22,6 +24,10 @@ module Liquid
     end
 
     def render_to_output_buffer(context, output)
+      render_tag(context, output)
+    end
+
+    def render_tag(context, output)
       # Though we evaluate this here we will only ever parse it as a string literal.
       template_name = context.evaluate(@template_name_expr)
       raise ArgumentError, options[:locale].t("errors.argument.include") unless template_name

lib/liquid/template.rb

@@ -92,6 +92,14 @@ module Liquid
         @tags ||= TagRegistry.new
       end
 
+      def add_register(name, klass)
+        registers[name.to_s] = klass
+      end
+
+      def registers
+        @registers ||= {}
+      end
+
       def error_mode
         @error_mode ||= :lax
       end
@@ -191,18 +199,26 @@ module Liquid
 
       output = nil
 
+      context_register = context.registers.is_a?(StaticRegisters) ? context.registers.static : context.registers
+
       case args.last
       when Hash
         options = args.pop
         output = options[:output] if options[:output]
 
-        registers.merge!(options[:registers]) if options[:registers].is_a?(Hash)
+        options[:registers]&.each do |key, register|
+          context_register[key] = register
+        end
 
         apply_options_to_context(context, options)
       when Module, Array
         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/utils.rb

@@ -52,7 +52,7 @@ module Liquid
       when Numeric
         obj
       when String
-        obj.strip =~ /\A-?\d+\.\d+\z/ ? BigDecimal(obj) : obj.to_i
+        /\A-?\d+\.\d+\z/.match?(obj.strip) ? BigDecimal(obj) : obj.to_i
       else
         if obj.respond_to?(:to_number)
           obj.to_number

lib/liquid/variable.rb

@@ -104,6 +104,14 @@ module Liquid
       output
     end
 
+    def disabled?(_context)
+      false
+    end
+
+    def disabled_tags
+      []
+    end
+
     private
 
     def parse_filter_expressions(filter_name, unparsed_args)

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/tags/render_tag_test.rb

@@ -89,14 +89,12 @@ class RenderTagTest < Minitest::Test
     end
   end
 
-  def test_includes_and_renders_count_towards_the_same_recursion_limit
+  def test_sub_contexts_count_towards_the_same_recursion_limit
     Liquid::Template.file_system = StubFileSystem.new(
-      'loop_render' => '{% render "loop_include" %}',
-      'loop_include' => '{% include "loop_render" %}'
+      'loop_render' => '{% render "loop_render" %}',
     )
-
-    assert_raises Liquid::StackLevelError  do
-      Template.parse('{% render "loop_include" %}').render!
+    assert_raises Liquid::StackLevelError do
+      Template.parse('{% render "loop_render" %}').render!
     end
   end
 
@@ -148,4 +146,23 @@ class RenderTagTest < Minitest::Test
     Liquid::Template.file_system = StubFileSystem.new('decr' => '{% decrement %}')
     assert_template_result '-1-2-1', '{% decrement %}{% decrement %}{% render "decr" %}'
   end
+
+  def test_includes_will_not_render_inside_render_tag
+    Liquid::Template.file_system = StubFileSystem.new(
+      'foo' => 'bar',
+      'test_include' => '{% include "foo" %}'
+    )
+
+    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
+    Liquid::Template.file_system = StubFileSystem.new(
+      'foo' => 'bar',
+      'nested_render_with_sibling_include' => '{% render "test_include" %}{% include "foo" %}',
+      'test_include' => '{% include "foo" %}'
+    )
+
+    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
 end

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

@@ -82,7 +82,7 @@ class StaticRegistersUnitTest < Minitest::Test
     static_register["two"] = 4
     static_register[true] = "foo"
 
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static_registers)
+    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
@@ -109,7 +109,7 @@ class StaticRegistersUnitTest < Minitest::Test
     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_registers)
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
   end
 
   def test_fetch_with_static
@@ -135,10 +135,10 @@ class StaticRegistersUnitTest < Minitest::Test
     assert_equal true, static_register.key?(true)
   end
 
-  def test_static_register_frozen
+  def test_static_register_can_be_frozen
     static_register = set_with_static
 
-    static = static_register.static_registers
+    static = static_register.static.freeze
 
     assert_raises(RuntimeError) do
       static["two"] = "foo"
@@ -176,9 +176,9 @@ class StaticRegistersUnitTest < Minitest::Test
     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_registers)
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, new_register.static_registers)
-    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, newest_register.static_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
@@ -204,8 +204,45 @@ class StaticRegistersUnitTest < Minitest::Test
     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_registers)
-    assert_equal({ foo: :bar }, new_register.static_registers)
-    assert_equal({ bar: :foo }, newest_register.static_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_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
+
+    new_register = StaticRegisters.new(static_register)
+    assert_equal({}, new_register.registers)
+
+    assert_equal({ nil => true, 1 => :one, :one => "one", "two" => 3, false => nil }, static_register.static)
+
+    new_register["one"] = 4
+    new_register["two"] = 5
+    new_register["three"] = 6
+    new_register.static["four"] = 10
+
+    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